Disertación/Tesis

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2024
Disertaciones
1
  • ARTHUR MATHAUS VARELA BARBOSA
  • DETERMINATION OF PHYSICAL-CHEMICAL PROPERTIES OF NADES BASED ON SUGAR, CHOLINE CHLORIDE AND CITRIC ACID

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • ADOLFO LOPES DE FIGUEREDO
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • LIANA FRANCO PADILHA
  • Data: 08-feb-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Deep Eutectic Solvents (DES) are known today as "green solvents," presenting attractive properties for the industry and meeting current sustainability requirements. These solvents are composed of a hydrogen bond donor component (HBD) and another hydrogen bond acceptor component (HBA). An important class of DESs that has gained prominence is Natural Deep Eutectic Solvents (NADES), derived from natural sources and fundamental metabolic reactions of living organisms. NADES possess desirable characteristics such as low toxicity, biodegradability, and low cost, which have drawn researchers' attention to their use in solubility processes, liquid-liquid extraction, among other applications. The continuous development of synthesis methods and a deep understanding of NADES properties will contribute to their successful application in various chemical processes. In this study, the viability of synthesizing NADES formed by organic sugars (fructose, sucrose, and glucose), citric acid, and choline chloride was investigated. Their fundamental physicochemical properties, such as density, viscosity, and electrical conductivity, were evaluated over a temperature range between 303 – 333 K. Refractive index and pH properties were obtained at 293 K and 1 atm. These properties were also assessed and studied for two mixtures based on fructose and citric acid with an alcohol (ethanol).

2
  • JANIELE ALVES EUGÊNIO RIBEIRO GALVÃO
  • Obtaining the Extract of Aranto leaves (Kalanchoe laetivirens) with supercritical CO2 and Ethanol.
  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • ANDRE ANDERSON COSTA PEREIRA
  • ENIO RAFAEL DE MEDEIROS SANTOS
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • OSVALDO CHIAVONE FILHO
  • Data: 23-feb-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Aranto (Kalanchoe laetivirens) is an Africa’s native succulent plant, which is present on several continents. Easy to propagate, it contains bioactive compounds such as phenolic compounds and bufadienolides. Used as a natural remedy, there is still no unanimity regarding its pharmacological effectiveness. However, recent studies indicate that its components have anti-inflammatory, antitumor and analgesic activity. In this context, extraction with supercritical CO2 appears as an alternative for obtaining these components, as it avoids the degradation of bioactives, in addition to being a quick extraction that allows for a purer extract. Furthermore, in some cases the use of cosolvents is necessary due to their solubility with the component of interest and also the viscosity of the extract. That said, ethanol was used in all the experiments. The operating conditions for the tests were developed in a pressure range of 80 to 140 bar, a temperature of 35 to 65° C and a mass ratio between aranto and ethanol of 0.58 to 1.75, with a fixed extraction time of 30 minutes and a previously defined bed particle size with an average diameter of 1.15 mm, making up a 2³ factorial design with a triplicate at the central point. The extract was characterized in terms of antioxidant power by sequestering the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical and the content of phenolic compounds by the Folin-Ciocalteu spectrophotometric method. In addition, the following was identified and quantified in the samples, quercetin, via HPLC (High Performance Liquid Chromatography). The mass yields obtained in the extractions ranged from 0.48 to 2.19%, with the best results being obtained at 65 °C, 80 bar and a ratio of 0.58. According to the statistical analysis of the yield results, the concentration of the solvent had a significant effect. In the Soxhlet extractions, a yield of 19.05% was found using dried aranto leaves and ethanol as the solvent. However, a yield of 0.97% was observed using the fresh leaves of the respective plant, due to the 95.9% moisture content. The results of the quercetin quantification of the samples ranged from 1.03 to 31.96 mg/L. The antioxidant content of the best supercritical extraction condition resulted in an EC50 value (effective concentration that reduces 50% of free radicals) of 22.86 µg/ml, while the sample from the conventional extraction of the dried leaves with ethanol resulted in values of 114.26 µg/ml. With regard to the content of phenolic compounds, the best condition showed 65.73 mg EAG/g Extract (EAG - Gallic Acid Equivalents), while the soxhlet extractions showed 83.28 and 89.09 mg EAG/g Extract from the fresh and dried leaves respectively.

3
  • HERBET LIMA OLIVEIRA
  • Hydrogen fuel generation from electrochemical wastewater treatment: a new arising concept for energy source

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • ELISAMA VIEIRA DOS SANTOS
  • JOSÉ EUDES LIMA SANTOS
  • JUSSARA CÂMARA CARDOZO
  • SALVADOR COTILLAS SORIANO
  • Data: 26-feb-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • With the increase in population, we see new challenges emerging in different sectors of society. This changing scenario gave rise to the 2030 Agenda, which addresses the objectives of sustainable development. Issues such as the increase in domestic effluents, growing food demands and the consequent increase in industrial waste, including various biomasses, as well as the use of fossil fuels, stand out as important environmental challenges that require more sustainable solutions for the future. In this context, the electrorefinery appears as an attractive proposal to face these problems. By employing clean energy, it makes it possible to convert materials considered waste into value-added products. Therefore, this work aims to transform a real domestic effluent, in this case, the washing water from a washing machine, and an industrial residue, the liquid from the shell of cashew nuts, into value-added products, such as acids carboxylic acids, while simultaneously cogenerating green hydrogen. Cells divided by polymeric electrolytic membranes, types PEM and AEM, were used, with BDD/Nb electrodes as anode and Ni-Fe stainless steel mesh as cathode. In the treatment of washing machine effluent, two different electrolytes were tested (H2SO4 0.1 mol L-1 and Na2SO4 0.1 mol L-1), also varying the current densities. The results reveal the production of products with added value, especially carboxylic acids, with emphasis on selectivity to acetic acid, reaching 45.7 mg L-1. Furthermore, we observed the generation of green H2, with volumes of approximately 0.8 L. When using the liquid from cashew nut shells, different conditions were explored, such as current density, concentration and nature of the electrolyte (NaOH 0.125, 1.0 and 2.0 mol L-1 and Na2SO4 0.05 mol L-1), and substrate concentration. It was found that all variables influence the production of carboxylic acids and the energy efficiency of green H2, with the substrate concentration being the most significant variable in the production of acids and current density in that of green H2. As the substrate concentration increases, it was possible to achieve acetic acid production rates of 565.4 mg L-1, and at higher current densities, green H2 volumes of 1.8 L were observed. , the viability of technology based on electrorefinery is evidenced by the selective electrochemical transformation of organic pollutants from waste into value-added products, such as green H2 and carboxylic acids. This advance represents a promising step towards the circular economy, contributing to environmental sustainability.

4
  • THALITA MEDEIROS BARROS
  • DEVELOPMENT, CHARACTERIZATION AND APPLICATION OF A NEW GRAPHITE SHEET ELECTRODE OBTAINED BY CHEMICAL STEAM DEPOSITION FOR ELECTROCHEMICAL DETERMINATION OF CAFFEINE

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • MÓNICA CERRO LÓPEZ
  • CARLOS ALBERTO MARTINEZ HUITLE
  • ELISAMA VIEIRA DOS SANTOS
  • JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
  • JUSSARA CÂMARA CARDOZO
  • Data: 28-feb-2024


  • Resumen Espectáculo
  • Graphite-based electrochemical sensors are widely applied in the most diverse fields of electrochemistry, such that innovations related to this material gain prominence in the scientific world. With this in mind, in order to obtain a disposable, versatile, environmentally friendly and low-cost electrode, the synthesis of graphitic films on a micrometric scale was proposed through the pyrolysis of Toluene. The Chemical Vapor Deposition (CVD) synthesis process applied in this work is advantageous as it does not require the use of metal catalysts, substrates, vacuum, plasma or hydrogen flow, which are necessary when it comes to traditional CVD synthesis. In order to characterize the graphite microsheets as a working electrode, morphological and physical-chemical characterizations of the material were carried out using techniques such as: Scanning Electron Microscopy, Transmission Electron Microscopy, Fourier Transform Infrared Spectroscopy, Energy Dispersive X-rays, X-ray Diffraction, Raman Spectroscopy and Contact Angle (Θ = 95.69°). For a more in-depth characterization from an electrochemical point of view, the electrochemical behavior was evaluated in the presence of different redox probes (Hexacyanoferrate (III) and Hexamin Ruthenium (III)), as well as their behavior in neutral, alkaline and acidic media. Furthermore, the electroactive area of the graphite microsheet electrode was evaluated, estimated at 0.083 cm2. Electrochemical Impedance Spectroscopy was carried out with the aim of evaluating the resistance to charge transfer that the electrode offers. Aiming to investigate the applicability of the graphite microsheet electrode in electroanalysis, the detection and quantification of caffeine in different types of commercial drinks was carried out. The results obtained clearly indicate that the graphite foil electrode presents a linear response over a wide range of caffeine concentrations (0.68-1477.26 µM), with R2 of 0.99. The limit of detection (LOD) is estimated at 0.68 µM, which suggests greater sensitivity and reproducibility than other conventional sensors, such as Glassy Carbon, Boron-doped Diamond Electrodes, for example. The low-cost disposable graphite sheet electrode was successfully applied to the determination of caffeine in soft drinks, energy drinks and black tea, presenting well-defined current signals in the analysis of real samples in the presence of 0.5M H2SO4 as electrolyte. When comparing electrochemical determinations and high-performance liquid chromatography measurements, it was observed the absence of discrepant values between both techniques. With these results, it is possible to highlight the potential use of this sensor as an analytical tool, disposable, portable, reliable, low-cost and high efficiency to determine caffeine in different types of samples.

5
  • RAISSA DAS GRAÇAS PONTES ARAÚJO
  • USE OF SHRIMP POND WATER FOR CULTIVATION OF MICROALGAE Synechococcus nidulans AIMING FOR BIOMASS PRODUCTION

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • BRUNA MARIA EMERENCIANO DAS CHAGAS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • SINARA CYBELLE TURIBIO E SILVA NICODEMO
  • Data: 29-feb-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The shrimp farming activity refers to the farming of shrimp and is very significant in the northeastern region of Brazil. To ensure the functioning of farms, an abundance of water is needed, which, if improperly disposed of, can cause various environmental damages. Another prominent activity in the country is the cultivation of sugar cane, which generates several by-products. One of them is molasses, whose sugar and nutrient levels are quite high. Thus, the use of microalgae to aid in the treatment of wastewater linked to the biorefinery process has been gaining prominence. Studies show that sugarcane molasses can be used as an economical and efficient supplement to microalgae growing media, offering substantial amounts of organic carbon. This work sought to evaluate the potential for reusing water from the organic shrimp production pond to dilute the Zarrouk medium (50%, 60%, and 70%) and the effect of adding molasses, compared with the traditional Zarrouk medium for cyanobacteria cultivation. Synechococcus nidulans, as low-cost cultivation media can enable the production of microalgae on large scales in an optimized way. It also sought to extract phycocyanin, a natural pigment present in microalgae of the genus Synechococcus. Cultivations were carried out in duplicate, under autotrophic and mixotrophic conditions, with a 12-hour light/dark photoperiod at 25°C and with mechanical air aeration. Cultivations of Zarrouk 70% SM (Without Molasses) and CM (With Molasses) generally showed better results compared to other diluted Zarrouk media, with biomass concentrations of 1.1005 g/L ± 0.1789 g/L and 0.9860 g /L± 0.0206 g/ L, respectively, but with lower results compared to traditional Zarrouk. It was found that the addition of carbon to the medium did not significantly interfere in favoring greater production. The pH of the medium remained in the range of 8.27-9.92. Biomass was characterized by carbohydrates, lipids, crude protein, and carotenoids. Carbohydrates were favored by the addition of molasses and the 70% CM test reached a maximum percentage of 21.24% ± 4.44%, while the lipid content was not affected so that it presented maximum values of 36.60% ± 0.00% (70% SM) and 31.80% ± 2.26% (70% CM). The protein content was also not affected, with maximum values reaching 21.55% ± 0.43% (70% SM) and 19.37% ± 0.56% (70% SM). Regarding the carotenoid content, a slight increase in concentration was observed in the CM experiments, with the highest value of 135.2238 mg/g ± 25.9163 mg/g (70% CM). The same occurred with phycocyanin, which was possible to extract and presented a concentration of 1.4919 mg/mL ± 0.2898 mg/mL in the 70% CM assay, with Extract Purity (PE) of 0.29.

6
  • JOSÉ VALDERISSO ALFREDO DE CARVALHO
  • SYNTHESIS OF LIGNIN-BASED BIOADTIVE FOR APPLICATION IN CEMENTING OIL WELLS

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • BRUNO LEONARDO DE SENA COSTA
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • JÚLIO CÉZAR DE OLIVEIRA FREITAS
  • RENATA MARTINS BRAGA
  • RODRIGO CESAR SANTIAGO
  • Data: 01-mar-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  •  

     
    Cementing plays a fundamental role in the construction of oil wells, as it is directly linked to their integrity and durability. A slury used for this purpose is typically composed of water, cement, and additives. Additives are essential materials for adjusting the physical and chemical properties of the slury, making it suitable for the peculiar temperature and pressure conditions found in wells. Additives can be synthesized from inorganic and natural compounds, one of which is lignin, a polymer present in lignocellulosic biomass. It has low commercial value however, when subjected to structural modification processes, it can acquire exceptional characteristics that make it highly valuable and suitable for various industrial applications. Thus, this research aimed to develop a bioadditive from green coconut lignin, via oxidative modification, for application in oil well cementing slurries. Lignin was extracted through alkaline pretreatment of green coconut biomass, and its structural modification was carried out through the oxidation process using hydrogen peroxide. After the synthesis process, unmodified lignin (LNM) and oxidized lignin (LOX) were characterized using Zeta potential, Fourier-transform infrared spectroscopy, UV spectrophotometry, and thermogravimetric analysis (TGA/DTG). The lignins were validated as retarder additives by the thickening time test, and the dispersant capacity was evaluated through rheology testing. The developed additive was compared to a commercial additive through a primary cementing simulation, where rheology tests, static filtration, and thickening time were evaluated. In characterization, the opening of aromatic rings and the increase in surface charge were confirmed in LOX. LOX provided greater retardation of setting time than LNM. A dosage of 0.5% of LOX resulted in a setting time of over 2 hours (50% more than the reference paste), validating it as a retarder additive. Additionally, LOX showed dispersant effect as a secondary property and contributed to reducing the rheological parameters of cement slurries. Technological application showed that LOX can modify the properties of cement slurries in a manner compatible with a commercial retarder additive. Its application together with other additives resulted in a slight increase in the rheological parameters of the slurries and contributed to reducing filtrate. Regarding thickening time, with just 0.1% of LOX, it was possible to delay the setting time by 71 minutes (31%) more than the reference paste. These results suggest that LOX is a promising alternative retarder additive that, in addition to benefiting the oil and gas industry, contributes to adding value to green coconut waste.
     
    Keywords: Lignocellulosic biomass; lignin; natural additives; cementing; oil wells.
7
  • FRANCISCO BRUNO FERREIRA DE FREITAS
  • Biodegradation of 2-methylnaphthalene and phenanthrene by Pseudomonas aeruginosa AP029-GLVIIA in microcosms in the presence of industrial dispersant

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EMILIANNY RAFAELY BATISTA MAGALHAES
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • Data: 01-mar-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Oil stands out as one of the precursors for the production of materials, fuels, and even medicines. Knowing this great importance, extraction, and refining processes are frequent and due to this great exploration, accidents can happen causing spills in soils and oceans. Due to its high carcinogenicity and mutagenic aspects, the presence of some polycyclic aromatic hydrocarbons (PAHs), present in the composition of the oil, poses risks to humans and wild animals. Thus, to mitigate the environmental problems caused by PAHs in the event of a spill, the use of microorganisms for biodegradation has been seen as a potential solution. One factor that hinders the microbiological decomposition of PAHs is the hydrophobicity of the molecules, which is why the industry invests in the development of dispersants that reduce surface tension at the hydrocarbon/water interface. In this context, the literature has demonstrated the advantages of biosurfactants (surfactants of biological origin) about surfactants from the chemical industry. The main objective of the present study is to evaluate the biodegradation capacity of 2-Methylnaphthalene and Phenanthrene (model hydrocarbons) by Pseudomonas aeruginosa AP029-GLVIIA in the presence of industrial biosurfactant using microcosm cultures. The biosurfactant was provided by chemical industry and was characterized in terms of surface tension and emulsification index (E%). Biodegradation tests were carried out by varying the concentration of hydrocarbons and biosurfactant for 10 days, monitoring pH, bacterial growth, and biodegradation rate, and also evaluating the degradation of the hydrocarbon mixture. The results demonstrate that the industrial biosurfactant presented satisfactory emulsification index results for toluene and lubricating oil, presenting values above 40% for concentrations of NaCl added and in small concentrations of biosurfactant, presenting these values after 240 hours of cultivation. The biosurfactant, in addition to acting as a dispersant, reducing the surface tension of the hydrocarbon/water interface, acted as a carbon source for growth for Pseudomonas aeruginosa AP029-GLVIIA, thus favoring its greater growth. The bacteria were able to degrade phenanthrene and 2-MN, obtaining degradation values of up to 61.43% and 100% respectively, under the same conditions, in the experiment that presented a concentration of 17.69 g/L of biosurfactant. It was also observed that the biosurfactant improved the biodegradation rate, with phenanthrene being the only variable that had a significant influence on the studied response, while for 2-MN the model presented all variables and their interactions as significantly related to the proposed model. Furthermore, the model developed from the results of the statistical analysis managed to explain 92.31% of the data presented for the degradation of phenanthrene and around 97.30% for the biodegradation of 2-MN. The mixture of the two model hydrocarbons studied presented a degradation rate of 6.41% and 100% for phenanthrene and 2-MN respectively.

Tesis
1
  • RAPHAEL LUCAS JACINTO ALMEIDA
  • PRE-TREATMENTS APPLIED TO RED RICE STARCH FOR THE PRODUCTION OF NANOCRYSTALS FOR USE IN OIL/WATER (O/W) PICKERING EMULSIONS

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 06-feb-2024


  • Resumen Espectáculo
  • During the production of starch nanocrystals (SNC), pre-treatments can be a promising alternative to break starch granules and/or create pores and cracks, allowing better acid diffusion. These nanocrystals can be used to enhance Pickering emulsion stability. Thus, the present study evaluated the use of non-thermal, hydrothermal, and enzymatic pre-treatments on red rice starch for SNC production. Non-thermal pre-treatment (I) with pulsed electric field (PEF: 10 and 30 kV cm-1) on starch was employed, and its action was assessed when combined with α-amylase pre-treatment (II) (PEF+α). Hydrothermal pre-treatment (III) (autoclaving and cooking) on grains and starch was examined for its influence on drying kinetics, and both were subsequently combined with enzymatic hydrolysis using α-amylase (IV). A new route of enzymatic starch modification was evaluated after HPT treatment, using the α-amylase and amyloglucosidase enzymes in a semi-simultaneous manner (HSS), in comparison with the conventional technique, which is done consecutively (CH). Semi-simultaneous hydrolysis (HSS) strategy (V) was tested to optimize process time and reduce solvent quantity compared to consecutive hydrolysis (CH) with α-amylase and amylglucosidase, both with enzyme loading of 9 U mg-1. Results showed that both PEF and HPT reduced drying time by up to 180 min, with HPT achieving the highest yields (53.54%). The order of PEF application affected starch structural characteristics, with PEF30+α being more effective in reducing syneresis and retrogradation due to an 83.30% increase in the degree of digestion. HPT applied to starch was viable for modifying structure and enzymatic susceptibility with α-amylase, resulting in changes in granule geometry, breakdown of amylose and amylopectin molecules, reduced crystallinity, and the formation of amylose-lipid complexes. The HSS method (α-amylase and amyloglucosidase) was more effective, presenting a higher degree of digestion (80.08%) and optimized technological properties compared to native starch. Autoclave-based HPT (A3) allowed efficient SNC production in just 1 day of acid hydrolysis, significantly reducing process time. When applied in Pickering emulsions, SNCs (3%) effectively stabilized temperatures at 4, 25, and 40°C, with a maximum particle size of 180 µm, reduced to 138 µm without quercetin and 98 µm with quercetin (1%) on the 21st day. Although sulfuric acid hydrolysis is the most common method for SNC production due to its low cost, there is a need to improve the process through further research, as low yield and long production times hinder progress. Exploring new routes to modify native starch is important, focusing on environmentally friendly techniques, where combined thermal and non-thermal methods offer the advantage of altering starch structure while minimizing the use of toxic reagents. These emerging methods should be applied to assess Pickering emulsion stabilization, which can be viable by enhancing interfacial interactions.

2
  • RAYANNE MACÊDO ARANHA VIEGAS
  • Organophilic clays applied to the removal of carbamazepine for the remediation of groundwater contaminated

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • EDSON CAVALCANTI DA SILVA FILHO
  • ITALLA MEDEIROS BEZERRA
  • JOSY ANTEVELI OSAJIMA FURTINI
  • OSVALDO CHIAVONE FILHO
  • VIVIAN MARIA DE ARRUDA MAGALHÃES
  • Data: 26-feb-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In recent years there has been growing concern about the contamination of water by emerging contaminants, such as pharmaceuticals. Carbamazepine (CBZ) is a psychotropic drug widely used throughout the world and has been frequently detected in water bodies, including groundwater. Organoclays have been used as efficient adsorbents for pharmaceutical pollutants. In this study, four types of organoclays were prepared from the modification of national bentonite clay with two cationic surfactants: hexadecyltrimethylammonium bromide (HDTMA) and octadecyltrimethylammonium bromide (ODTMA). The synthesized materials were extensively characterized. X-ray diffraction analyzes showed that the basal spacing of organoclays varied from 1.54 to 2.93 nm, suggesting the intercalation of organic cations in the interlayer space of montmorillonite. Initially, the synthesized clays were evaluated as adsorbents for the sorption of CBZ through batch equilibrium experiments, under variation of the pH, contact time, dosage of adsorbent, and initial drug concentration. pH variation showed no adsorption influence. CBZ sorption by the organoclays followed a pseudo-second-order kinetics. The best sorption performance was obtained for the BCN1-HDTMA100 clay, with a capacity of 34.34 ± 1.41 mg/g, about ten times greater than the unmodified bentonite under the same conditions. This may be attributed to the higher surfactant content. The adsorption isotherm at 25 ºC showed linear behavior. FTIR and TG analyzes on organoclay-CBZ hybrids confirmed the incorporation of the drug. Hydrophobic interaction was the dominant contribution evaluated to the adsorption of CBZ. Furthermore, toxicity tests were carried out on organoclays and the medium in the presence of CBZ before and after treatment. This is a novelty report. Most of the organoclays had no toxicity against Artemia salina. The toxicity of the medium after adsorptive treatment was eliminated. After batch study, two synthesized organoclays (BCN1-HDTMA100 and BCN1-ODTMA100) were selected for the study of continuous adsorption of CBZ through tests in a fixed bed column filled with a mixture of sand and organoclay aiming at application as a medium reactive Permeable Reactive Barriers (PRB) for groundwater remediation. At this stage, the performance of the synthesized clays was compared to that of a commercial organoclay, Spectrogel Type C. The adsorption performance was evaluated using breakthrough curves. The effects of the initial drug concentration, quantity and type of clay in the fixed bed were evaluated. In general, the synthesized clays performed better than Spectrogel Type C. The lower adsorption capacity of CBZ by commercial clay may be associated with effects related to the packing density of organic cations in the interlayer space. Under the conditions of 1.0g of clay in the bed, 95 mg/L of initial CBZ concentration and flow rate of 1.0 mL/min, the clays BCN1-HDTMA100 and BCN1-ODTMA100 presented breakthrough times of 505 and 525 min and adsorption capacities of 46.652 and 50.139 mg/g, respectively. Therefore, organoclays have demonstrated promising potential for use in groundwater remediation applications.

3
  • LUIZ EDUARDO PEREIRA SANTIAGO
  • Desulfurization of fuel by extraction using microdevices

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • ELEDIR VITOR SOBRINHO
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 08-mar-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Conventional methods for removing sulfur compounds perform poorly especially when treating aromatic compounds. Current studies have directed efforts to investigate extractive desulfurization (EDS) using microdevices. Microdevices are units with micrometer-sized channels that enhance mass and heat transfer phenomena. For EDS in microdevices to be viable, it is essential to choose the appropriate extractor solvent used. Among the possibilities, an excellent candidate is polyethylene glycol (PEG). The present work aims to analyze the use of PEG 300 and PEG 400 in the removal of dibenzothiophene. The identification of flow patterns was carried out using digital image colorimetry, making it possible to estimate the specific interfacial area and the volumetric mass transfer coefficient. The experiments followed na experimental logic that allowed extracting insights into deep desulfurization. In addition, the mass transfer phenomena involved and the application of the best experimental conditions in a real diesel sample were evaluated. The results obtained with model fuel were able to achieve 99.36% DBT removal with 1.0 minute residence time, 1:1 volumetric ratio, and three extraction cycles. Furthermore, applying the best experimental conditions to diesel, the total sulfur concentration decreased from 1646 to 312 ppm, resulting in an extractive efficiency of 81.04%.

4
  • KESLEI ROSENDO DA ROCHA
  • Modifications to post-marketed polyurethane foams for sorption of oils spilled in seawater

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • ANDRE ANDERSON COSTA PEREIRA
  • GILSON GOMES DE MEDEIROS
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MANOEL REGINALDO FERNANDES
  • OSVALDO CHIAVONE FILHO
  • Data: 14-mar-2024
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The exploration, transportation, and refining of oil are fundamental to the global economy. Occasionally, oil spills in the ocean are reported. Rapid containment and remediation are essential to prevent oil from being carried to the coasts by wind and wave action. The methods currently used to remove oils in water are not free of flaws, and because of that, constant research to develop alternative methods is necessary. In this context, this work proposed the use of post-consumer polyurethane foams to recover oils spilled in seawater. Surface modifications were carried out to increase the selectivity of foams for oils and resulted in increases up to 611% and 991% for modifications with MoS2 and ZnO in systems with S46 lubricating oil and 20W40 engine oil, respectively. These results show the success of hydrophobization and lipophilicity added to the foams through the modifications made. The reuse and resistance to mechanical compression tests showed that even after 10 sorption/desorption cycles, the foams kept their oil recovery capacity without a statistically significant difference. This result demonstrates the economic potential of modified foams thanks to their high reusability capacity. Kinetic studies on seawater-oil systems showed that the saturation speed depends on the viscosity of the oil, but that the foam pores are saturated with fluids practically instantly and reach equilibrium in less than 40 seconds of exposure. The pseudo-second-order (Ho and McKay) and logistic (Richards and Verhulst) kinetic models were those (among all kinetics models studied) that most adequately described the behavior of the experimental data in all cases, presenting high coefficients of determination (R² > 0.97) and low sums of squared residuals. In continuous sorption, the modifications favored oil selectivity, but the vacuum pumping operating mode was the most relevant factor, reaching selectivity up to 90% for the spilled oil instead of seawater. After use in oil recovery, post-commercialized foams impregnated with oils can be used for co-processing in clinker kilns. In this way, part of the energy required for cement production is obtained by processing Refuse-Derived Fuel (RDF).

2023
Disertaciones
1
  • THAINE TAUMATURGO CAMINHA
  • FORMULATION OF MICROEMULSIONS TO BE APPLIED AS FLUSHING FLUID  IN OIL WELL CLEANING

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • EDSON DE ANDRADE ARAÚJO
  • FABÍOLA DIAS DA SILVA CURBELO
  • JÚLIO CÉZAR DE OLIVEIRA FREITAS
  • RENATA MARTINS BRAGA
  • Data: 09-feb-2023


  • Resumen Espectáculo
  • Flushing fluid are fluids used during the well drilling process, which perform the function of cleaning the walls of the well, removing the plaster formed and ensuring that the next stage of cemeting is successful. Flushing fluids can be made up of water or oil, surfactants and dispersants, being able to thin and remove the drilling fluid. In this context, the use of vegetable oils in the composition of flushing fluid and the use of biodegradable surfactantes are important for formulations developed ecologically correct. Thus, this study aims to develop microemulsions which act as potential flushing fluid, to be used for cleaning and inversion wettability of wells, before an operation of cementing oil wells. Two diferente microemulsion systems were prepared using nonionic surfactante, the first one using bio oil as vegetable oil and the second using castor oil. Removal tests, termal stability, rheology, inversion of wettability and compatibility tests were realized to verify the efficiency of the flushing fluids formulated for future application in the oil industry. According to the removal test, using bio oil as vegetable oil, the microemulsions were able to removed completely the drilling fluid in up to 3 minutes (time less than 10 minutes of the test). However, meantime through reversing wettability tests, the sample wasn’t efficient. Castor oil based microemulsions were able to removed the drilling fluid, the removal was greater than 75% in all samples, ans they are all stable in the temperature gradient of the well and they are newtonian fluid. In addition, the system formulated using NP100, water/glycerin and castor oil diluted in a 1:1 showed satisfactory compatibility with drilling fluid.

2
  • ILA GABRIELE DINIZ DIAS DE AZEVEDO
  • PHOTOCATALYTIC DEGRADATION OF RHODAMINE B USING COPPER AND NICKEL FERRITS SYNTHESISTED BY THE COMBINED COMPLEXATION METHOD EDTA-CITRATE

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • CARLSON PEREIRA DE SOUZA
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • YARA FELICIANO GOMES
  • Data: 23-feb-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • World pollution has increased more and more due to industrial expansion and
    consequently global growth. The aquatic environment is one of the most affected, with
    many different types of pollutants being found, which cause pH and temperature
    variation, increased chemical oxygen demand and reduced biochemical oxygen demand.
    Dyes, make up the class of these pollutants, having an organic nature and resistance to
    conventional treatments, requiring the application of more effective processes such as
    Advanced Oxidative Processes (AOP's). AOP's cover a wide range of processes, among
    which are methods that use semiconductor catalysts to promote the generation of
    hydroxyl radicals (HO•), and these catalysts can be of different natures, and among
    them, ferrites. Ferrites, with general formula, MFe2O4, are chemically and
    mechanically stable magnetic materials, where M represents cations of bivalent metals
    and can be represented by a mixture of them in order to improve the properties of the
    materials. From this, the present master's thesis qualification aims at the use of mixed
    copper and nickel ferrites (NixCu1-xFe2O4), in different proportions (x = 0; 0.2; 0.8
    and 1), to degrade photocatalytically the dye Rhodamine B, simulating an industrial
    effluent containing dye, in order to verify which material is more effective in the
    degradation. Where, the mixed copper and nickel ferrites were synthesized by the
    combined EDTA-Citrate complexation method, according to the methodology
    developed by Rodrigues (2020), calcined at 700 °C for 240 minutes, later the samples
    were characterized by XRD, Ritveld refinement, SEM-FEG, TG, FT-IR and ERD UV-
    Vis. Afterwards, a series of tests were developed to define the most efficient approach
    to degradation of the Rhodamine B dye, namely: self-degradation, photolysis and
    photocatalysis, where photocatalytic degradations showed better results. Finally,

    reaction parameters such as pH and catalyst load were changed in order to find the
    optimal reaction conditions, which were achieved for a catalyst load of 0.62 g/L, pH =
    10 and dye concentration of 10 ppm. Finally, the samples containing the highest copper
    content, CuFe2O4 and Ni0,2Cu0,8Fe2O4, obtained the best degradation results with
    approximately 60% removal of the Rhodamine B dye.

3
  • THAÍS BEZERRA VERÍSSIMO MIGUEL
  • Development of biodegradable films from jackfruit starch (Artocarpus heterophillus Lam.) adding acerola residue (Malphigia ermaginata)

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • KATIA NICOLAU MATSUI
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • LUCIANA DE SIQUEIRA OLIVEIRA
  • Data: 27-feb-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The environmental impact generated by the continuous use of inert material, originating exclusively from petroleum derivatives, has favored the increase in research aimed at the development of biodegradable films, as they have been investigated as promising strictures due to their safety, versatility of use and obtainment. In addition, as a primary packaging, these films can increase the shelf life of food, play active roles, regulate oxygen exchange rates, moisture, improve sensory qualities, can play nutrient support roles, preserve bioactives, raising their quality and service life. The demand for new starch sources has been growing making the productive sector look for new Technologies, as well as natural starches with differentiated physicochemical characteristics. The objective of this work was to develop and characterize biodegradable active films from jackfruit seed starch (Artocapus heterophillus Lam), incorporated from acerola powder (Malphigia ermaginata) prepared by casting processes. In casting films, filmogenics solutions were prepared in fixed concentrations of jackfruit seed starch (4%), acerola power (0.5 and 1%) and glycerol (2%). One important step of this study was to evaluate the physical-chemical, structural and morphological. Initially, the physical-chemical, structural and morphological characteristics of the jackfruit seed starch were evaluated. Subsequently, after drying in an oven and lyophilization, the acerola residue was used in the preparation of biodegradable films, comparing their active performance through the analysis of phenolic compounds and antioxidant activity. In addition, they were characterized in terms of water vapor permeability, solubility, humidity, thickness, scanning electron microscopy (SEM). The results obtained showed that the films had a reasonable thickness ranging from 0.083 to 0.136 mm, high solubility (76.7% to 90.9%), low permeability to water vapor, the XRD showed starch as type A. In the analysis of bioactive compounds it was proved that it has an active function and that the way in which the acerola residue was dehydrated contributed to the results shown, phenolic compounds varied from 156.9 to 320.9 mg GAE/100 g, the antioxidant activities ranged (DPPH) 2830 to 3463 μmol TE/g and (ABTS) 48.6 to 66.28 µmol Trolox/g ABTS. For all these reasons, the formulation of films based on jackfruit seed starch showed potential in manufacturing, with barrier and bioactive properties.

     

4
  • WILZA KIMILLY VITAL DE PAIVA
  • SURFACTIN PRODUCTION BY Bacillus subtilis UFPEDA 438 FROM SUGARCANE MOLASSES AND EVALUATION OF ITS BIOLOGICAL ACTIVITIES INCLUDING IN SILICO AGAINST SARS-CoV-2

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • LETÍCIA DOBLER
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • CRISTIANE FERNANDES DE ASSIS
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • Data: 28-feb-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Lipopeptides are biosurfactants, substances with a high surfactant potential where each family corresponds to a group of isoforms that differs in the peptide's composition, the length of the lipid chain and the connection between them. Among them, fengycin, iturine and surfactin, lipopeptides with high surfactant and antibiotic potential, stand out. As a lipopeptide, surfactin is a set of isoforms, biosynthesized or engineered, where the relationship between their structures and properties helps choose and direct the product to the final application, that can range from the surface cleaning and disinfection industry to crude oil recovery, in addition to being the subject of studies in medical and pharmacological applications. In the context of COVID-19, the present study aims to produce surfactin and iturin through the cultivation of Bacillus subtilis UFPEDA 438, using sugarcane molasses as a substrate, as well as to evaluate his biological activity in vitro, including his antiviral potential through in silico analysis of the extract produced, against the 4 main target proteins of SARS-CoV 2. The results showed that 8 isoforms of surfactin and 2 of iturin were present in the samples, obtaining a maximum productivity of 148.548 ± 4.672 mg/L of surfactin. The extracts produced in both steps showed satisfactory levels and emulsification activities and promoted a reduction in the surface tension of water by up to 55.24%. Against free radicals (ROS), the samples also managed to block about 41.95% of them. Regarding the in silico evaluation, the greatest interaction of the studied biosurfactants was with the Spyke protein, which is crucial for the binding of the virus with the host human cell.

5
  • JOEMIL OLIVEIRA DE DEUS JUNIOR
  • DEVELOPMENT OF BIOSORBENT PARTICLES FOR THE TREATMENT OF PRODUCED WATER IN A COMBINED ADSORPTION/FLOTATION SYSTEM

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • RENATA MARTINS BRAGA
  • MARCUS ANTONIO DE FREITAS MELO
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • KARINE FONSECA SOARES DE OLIVEIRA
  • TIAGO ROBERTO DA COSTA
  • Data: 01-mar-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Produced water management is a concern in the oil industry due to the toxicity of the effluent and its immense produced volume, so the optimization of contaminant removal techniques, such as adsorption and flotation, is necessary to keep the process sustainable and unexpensive. Therefore, the aim of this work was to develop eco-friendly and low-cost bioadsorbent composites to remove contaminants from produced water through the combination of adsorption and flotation techniques. The composite was produced from a mixture of chitosan, biochar and bentonite via wet-spinning and characterized by immediate analysis, Boehm titration, zeta potential, pH at zero charge point, infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). A mix design was carried out to optimize the composition of the bioadsorbent, evaluating its percentage of removal of Cu (II) ions. The adsorption tests were carried out in a finite bath using single and multielement solutions of copper, lead and cadmium. While the flotation tests were carried out through a system using dissolved air in a column (flotatest), with feeding of monoelementary copper solution in batches. The morphological and superficial characterization of the material evidenced the presence of organic functional groups and pores that can become adsorption sites for contaminants such as heavy metals. The adsorption tests in systems with only one metallic species obtained a removal percentage above 90% for cadmium, lead and copper. However, in multielementary system, Cu2+, Pb2+ and Cd2+ ions showed a reduction in the maximum removal percentages, with lead adsorbed more efficiently (above 80%), followed by copper (above 40%) and, finally, cadmium with less than 20% removal. Therefore, it can be stated that the composite developed has the potential to remove heavy metals, which are some of the highly toxic contaminants present in produced water.

6
  • HELLOCKSTON GOMES DE BRITO
  • Application of different pretreatment strategies to convert green coconut fiber into cellulosic ethanol

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 04-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Large volumes of green coconut husk residues are generated from the exploration of the fruit. Thus, arousing interest in the use of this lignocellulosic material as a raw material for the production of biofuels. Therefore, the present study evaluates the influence of different pre-treatments, aiming at using coconut fiber to obtain cellulosic ethanol, being: sulfuric acid (H2SO4, 1% (v/v)) and steam explosion, as well as their combination (combined pre-treatments) with sodium hydroxide (NaOH, 1 and 4% (m/v)) and alkaline hydrogen peroxide (H2O2, 3 and 6% (m/v)). Were also evaluated separate hydrolysis and fermentation (SHF), simultaneous saccharification and fermentation (SSF), and semi-simultaneous saccharification, and fermentation (SSSF) strategies using the enzyme cocktail Cellic CTec2 and the yeast Saccharomyces cerevisiae (PE-2). The evaluation of the pre-treatments was carried out based on the analysis of the chemical composition of the materials, using High-Performance Liquid Chromatography (HPLC), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray Diffraction (DRX) for the crystallinity index. HPLC was also used to evaluate the sugars during the hydrolysis and fermentation processes. The results of the composition of materials and conversion of sugars applied in the tests indicated that the acid sulfuric pretreatment followed by NaOH (4.0% m/v) (ACN4) and the pretreatment with a steam explosion followed by NaOH (4.0% m /v) (EXPN4) were the best, since the 4% concentration of hydroxide provided higher levels of delignification, facilitating the enzymatic attack during the hydrolysis step. It is noteworthy that practically all the hemicellulose was hydrolyzed in the acid pre-treatment, thus, a significant concentration of xylose (10.5 g/L) was recorded in its liquid fraction, which was higher than that of the steam explosion (2.53 g/L). The use of sulfuric acid pre-treatments and steam explosion were effective to remove the hemicellulose present in the coconut fiber, but the enzymatic digestibility values of the combined pre-treated materials were low (cellulosic conversion less than 50%). In this case, a glucose production of 15.59 ±0.63 g/L was obtained for ACN4 and 13.28 ±0.75 g/L for EXPN4. In the enzymatic hydrolysis, the enzymatic cocktail Cellic CTec2 was used in different enzymatic loads, with the best results obtained for the load of 10.0 FPU/g for using the ACN4 pre-treatment and 15.0 FPU/g for the EXPN4 pretreatment, with cellulosic conversions 48.68 ± 1.98% and 50.24 ± 2.87%, glucose content 15.59 ± 0.63 g/L and 13.28 ± 0.75 g/L, for the ACN4 and EXPN4 assays, respectively. Regarding the fermentation strategies that were carried out varying the solid load, between 5% and 15% (m/v), the SSSF strategy, when using the acid-alkaline pre-treatment with NaOH (4.0% m/v), showed a better result compared to SSF, with a cellulosic ethanol yield of 46.67% and 18.37±0.91 g/L of ethanol. HFS, on the other hand, did not show results. For all these reasons, green coconut fiber proved to be suitable to be used to obtain second-generation ethanol (2G).

7
  • RAINY ALVES DE SOUSA
  • Electrochemistry as a sustainable method for simultaneous production of green hydrogen and carboxylic acids

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • ELISAMA VIEIRA DOS SANTOS
  • JOÃO MILLER DE MELO HENRIQUE
  • JUSSARA CÂMARA CARDOZO
  • Data: 21-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The present work aimed to apply an electrochemical technology, in order to, evaluate and analyze the efficiency on the degradation from model organic compound toward to carboxylic acids, as well as the simultaneous production of H2(g) in different electric current densities (15, 30 and 45mA/cm²) and for three different configurations on the electrochemical reactor. In first step, a three-compartment flow reactor in series mode was designed and fabricated, combining the electrocatalytic properties of two non-active anodes (PbO2-F and BDD) and a stainless-steel mesh cathode separated by two Nafion 350® membranes. Moreover, a mathematical model was developed to represent the reactor, as well as the reactions involved in the electrochemical process. The dye methyl orange (MO) was chosen as a model pollutant because it is a monoazo substance with a dark orange color and soluble in water, commonly used by the textile industries. The MO degradation process was monitored by absorption spectroscopy in the UV-vis region, Electroanalysis and FTIR. Meanwhilw, the quantification of carboxylic acids production, Ion Chromatography was performed. The results showed that the reactor used in the present work presented excellent results for the degradation of the organic compound, reaching 100% color removal after 60 minutes of electrolysis for all conditions studied. The FTIR data showed that there was degradation of the dye, mainly because we did not observe the peak presence corresponding to the binding of azo group at 1422 cm -1. Under the same conditions for degradation, a simultaneous production of green H2 of approximately 0.8 L was achieved. The carboxylic acids production was monitored over time for the different conditions tested, and it was observed that there was a selective production of malonic acid, the which opens up the possibility of future studies for the application of electro-refinery concept using these residues. The model showed good adherence to the experimental data, confirming that it can describe and predicting production under different operating conditions.

8
  • JOYCE AZEVEDO BEZERRA DE SOUZA
  • Phenol removal in water samples via zero iron-activated persulfate supported on biochar

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • OSVALDO CHIAVONE FILHO
  • RAONI BATISTA DOS ANJOS
  • RENATA MARTINS BRAGA
  • VIVIAN MARIA DE ARRUDA MAGALHÃES
  • Data: 24-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Modernization, rapid population growth, and increased production of inputs are triggering the generation of substantial volumes of industrial effluents. This escalating global issue poses a serious threat as it can contaminate water, soil, and air. The oil industry stands as the primary source of water contamination, both through its products and by-products, harboring numerous contaminants with toxicological, carcinogenic, and mutagenic properties. Such pollutants not only jeopardize the quality of the environment but also have adverse effects on human, animal, and plant health. Phenol, a prominent pollutant associated with this industry, is found in effluents such as petroleum-derived water and refinery by-products. Advanced Oxidative Processes (AOP) involving the use of sodium persulfate (PS) as an oxidant and a combination of zero valence iron (ZVI) supported on biochar (BC) have been widely employed for treating water contaminated with phenol. Therefore, this study aimed to utilize Persulfate-Activated Oxidation (POA) using sodium persulfate (PS) as an oxidant and a combination of zero valence iron (ZVI) supported on biochar (BC) for treating phenol-contaminated water. The biochar was derived from the pyrolysis of Calotropis procera fruit peels at a temperature of 300 °C for 1 hour, with a heating rate of 10 °C .min-1. The ZVI, on the other hand, was obtained through a chemical reduction method. The BC, ZVI, and BC-supported ZVI (BC/ZVI) were morphologically characterized using techniques such as XRF, XRD, SEM-EDS, FTIR, BET, zeta potential analysis, particle size analysis, and polydispersion index determination. For the experimental setup, a design was implemented in which the key variables were the oxidant concentration ([PS] = 1 to 9 mM) and BC/ZVI ratio ([BC/ZVI] = 1 to 5 g. L-1). Subsequently, process optimization was conducted by examining the oxidant concentration ([PS] = 5 to 13 mM), activator concentration ([BC/ZVI] = 3 to 7 g. L-1), and pH range (3.0 to 11.0). Furthermore, a comparison was made between the activating agent and commercial Fe0 to assess their effectiveness in the proposed AOP. The material characterization results revealed that the synthesized biochar shared similarities with previous works in the literature, featuring a carbonaceous structure with porous regions and various oxygenated groups on its surface. The synthesized ZVI exhibited structures designed to facilitate the availability of ZVI particles for oxidation. The oxidative treatment results indicated that the proposed PS/BC/ZVI system was efficient in phenol degradation, yielding satisfactory phenol removal rates. Through process optimization, the best conditions were achieved in test 4, with optimal parameters of [PS] = 13 mM, [BC/ZVI] = 7 g. L-1, and pH = 3.0, resulting in a maximum removal rate of 89.12%. The degradation of phenol using PS activated with BC/ZVI, as observed in this study, demonstrates its effectiveness in treating effluents and reducing toxicity levels in cases of water body contamination without proper treatment.

9
  • HORTÊNCIA NATHÂNIA SILVA CÂMARA
  • Vapor-liquid equilibrium data evaluation for systems of interest in the biodiesel production

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MANOEL REGINALDO FERNANDES
  • OSVALDO CHIAVONE FILHO
  • RAFAEL BARBOSA RIOS
  • Data: 28-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In an attempt to mitigate the environmental impacts arising from the burning of fossil fuels, many studies have sought to make biodiesel production even more feasible, since it is a renewable, biodegradable fuel that has a lower content of polluting compounds. In this sense, this work focuses on the description the vapor–liquid equilibrium (VLE) data of three systems that are of interest to the biodiesel industry. The following systems were studied: ethanol (1) and oleic acid (2) at isobaric data at 760 mmHg, isothermal at 318.15 K and activity coefficient at infinite dilution; n-hexane (1) and cottonseed oil (2) with isobaric data at 310 mmHg; ethanol (1) and soybean oil (2) with isobaric data at 760 and 600 mmHg. A thermodynamic modeling was carried out with the ideal (Raoult's Law), UNIQUAC correlation and UNIFAC prediction approaches. The vapor pressure data of the pure substances were extracted from the literature. The relative mean deviations of the fitted Antoine's constants for ethanol, oleic acid, n-hexane, cottonseed oil, and soybean oil were 0.34%, 3.30%, 0.55%, 5.00% and 2.53%, respectively. The activity coefficient at infinite dilution values and the VLE binary data for the ethanol and oleic acid system were extracted from the literature. For the other systems, binary data were obtained in a modified Othmer ebulliometer from a previous study in our laboratory (FOTEQ). The correlation study with the UNIQUAC model described with quality the behavior of all systems under the conditions of interest. This indicates that the obtained binary parameters can be used in process simulation studies, as well as in equipment sizing projects, such as distillation columns. The predictive study carried out with the UNIFAC model showed accurate descriptions as UNIQUAC model. Furthermore, for all systems, a deviation from ideality was observed, which reiterates the indispensability of using an activity coefficient model, such as UNIQUAC.

10
  • BEATRIZ MENEGHETTI COSTA DE ARAÚJO
  • VALUE OF GREEN COCONUT FIBER FOR THE PRODUCTION OF SECOND-GENERATION LIGNOSULFONATE AND ETHANOL

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 07-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The green coconout cultivation is present in several states of Brazil. Despite the variety of products derived from coconut, approximately 80-85% becomes waste, when improperly disposed, causes environmental problems, but which has great potential for use as lignocellulosic biomass, composed, mainly, of cellulose, hemicellulose and lignin. By being pre-treated to remove lignin (delignify) from the cellulosic matrix, the biomass has your recalcitrance reduced, allowing the access of cellulolytic enzymes to the polysaccharides of interest, which will be converted into fermentable sugars, then into second-generation ethanol. It is highlighted that the removal of lignin in the pre-treatment is not total, and may cause a non-productive adsorption in the enzymes used in hydrolysis, reducing their access to the polysaccharides, and decreasing the cellulosic conversion into sugars. Surfactants addition is an alternative that promote conformational stability and stabilize the electrostatic forces of repulsion between the enzyme and the lignin. In this context, the present study evaluated ethanol production and surfactant lignosulfonate (LS) production. The sugar production in enzymatic hydrolysis was studied by varying the biomass concentration and the enzymatic load, after pre-treatments with 2.0% sodium hydroxide (m/v) (test D) and combined (steam explosion at 210ºC, 10 minutes and 20 bar, followed by treatment with 2.0% sodium hydroxide) (test E). Then, the ethanolic production was evaluated for both tests, varying the solids load and in simultaneous (SSF) and semi-simultaneous (SSSF) saccharification and fermentation strategies. The lignosulfonate produced from a lignin sulfomethylation was added in the biomass enzymatic hydrolysis resulting from the combined pretreatment, in order to evaluate its effect on the sugars yield. In the enzymatic hydrolysis, the increase in the solid load showed a significant increase in the glucose concentration obtained for both tests. However, the variation in the enzymatic load was not statistically significant. Only for test E, at 15% solids, with 15 FPU/g (>34 g/L) and 20 FPU/g (>31 g/L). In fermentation, the change in fermentation strategy did not indicate a significant variation in ethanol production for test D, neither the variation in enzymatic load, which may indicate an excess of non-productive adsorption in the enzyme, due to its high retention rate after treatment (around 44%). In turn, for test E, the significant increase in enzymatic load increased the ethanol produced concentration. In addition, changing the strategy from SSF (at 20 FPU/g) to SSSF (at 15 FPU/g) showed an increase equivalent to 40% in the ethanol obtained concentration, while reducing about 25% of used enzyme. Regarding lignosulfonates, FTIR analyzes corroborate the efficiency of sulfomethylation process for sulfonation of the aromatic groups of lignin. As for its addition in enzymatic hydrolysis, for a concentration of 0.5 g/L (1% m/m of biomass), it showed a 30% increase in cellulosic conversion. Therefore, the results indicate that increasing the amount of solids in enzymatic hydrolysis increases cellulosic conversion, but increasing the enzymatic load is not always necessary. In addition, it was verified that the change in the fermentation strategy, in some cases, allows the reduction of the amount of cormaceous enzyme used, even increasing the production of ethanol in the process. Furthermore, lignosulfonate is efficient in reducing the non-productive adsorption of lignin on the enzyme during the enzymatic hydrolysis process.

11
  • PAULA DANIELE RIBEIRO AZEVEDO
  • MIXOTROPHIC CULTURE OF THE MICROALGAE Synechococcus nidulans USING FERMENTED EXTRACT OF CASHEW PULP WASTE FOR THE PRODUCTION OF ANTIOXIDANT COMPOUNDS

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • BRUNA MARIA EMERENCIANO DAS CHAGAS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • CRISTIANE FRANCISCA DA COSTA SASSI
  • EVERALDO SILVINO DOS SANTOS
  • Data: 07-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In recent years, interest in microalgae cultivation has been growing and receiving great attention, and this is due to the demands of the consumer market, which is increasingly demanding the use of ingredients from natural sources for cosmetics formulation. Brazil represents the fourth largest cosmetics market in the world, with great potential for the cultivation of microalgae species in favorable climatic conditions. Allied to this, the biotechnological concept appears, which is applied in the use of the photosynthetic capacity of the microalgae to produce biomass, which is the source for the extraction of compounds of interest. Thus, the objective of this research was to use a source of organic carbon, the Cashew Bagasse Extract (EBC), as a nutrient for the cultivation of the microalgae Synechococcus nidulans and carry out a bioprospection of the biomass obtained, combined with the environmental benefits due to the reduction of waste generated by agroindustry, contributing positively to the control and improvement of the environment, with the possibility of adding commercial value to waste in general. In this context, the present study evaluated the cell growth parameters and biomass productivity of the microalgae Synechococcus nidulans in autotrophic and mixotrophic conditions using cashew apple bagasse extract as a source of organic matter varying in concentrations of 0.5%, 1.5 % and 2.5%. The biomass composition was evaluated in terms of carbohydrates, proteins, lipids, ash and carotenoids. Cultivations were carried out in triplicate, under controlled conditions (temperature of 24 ± 1ºC, lighting 40 W, constant aeration, photoperiod of 12h light/dark). However, the analyzes showed variability for the cultures studied. Crops subjected to stress showed better biomass yields. There was a 25.9% drop in ash levels as you subjected the crop to stress and increased EBC concentration, unlike carbohydrate levels which increased by up to 28.5%  with increasing EBC compared to to control cultivation. Regarding the production of total proteins, the culture subjected to stress with the addition of EBC 2.5% stood out with 54.07 ± 3.59%. The results showed that the use of EBC in the production of bioactives by the microalgae was not able to promote the obtaining of better yields of total lipids and total carotenoids in relation to the control culture (13.22 ±0.25% and 10.02 ±4.33 mg.g-1 ). In general, these results demonstrate that the microalgae under study contain biocompounds of interest to the cosmetics industry and that these are likely to be commercially exploited.
12
  • TATYANE MEDEIROS GOMES DA SILVA
  • Study of the effect of electrolytes on the rheology of anionic polyacrylamide solutions.
  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • EDNEY RAFAEL VIANA PINHEIRO GALVAO
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • FRANCISCO WENDELL BEZERRA LOPES
  • Data: 26-sep-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Currently, a third of global energy is still obtained through oil. In this context, anionic polyacrylamide is widely applied in polymer injection processes for advanced oil recovery. However, due to its molecular composition, it becomes sensitive to several factors such as pH, temperature and salinity. Therefore, it is necessary to understand how the presence of different concentrations and types of electrolytes, together with temperature changes, affect their viscosity and rheological behavior. Therefore, rheological tests were carried out using the APAM 3430S with a molar mass of 12 million daltons in triplicate solutions of NaCl, KCl, MgCl2 and CaCl2, varying the temperature at 20, 35, 50, 65 and 80°C. The experiments were carried out in a rheometer with concentric cylinder geometry. The results showed that the addition of electrolytes resulted in a loss of viscosity in the solution. In some solutions containing MgCl2 and CaCl2, the Newtonian plateau for high shear rates was reached. The temperature variation reduced the viscosity of solutions with monovalent salts by around 45% and 70% of divalent solutions. The viscous activation energy and cloud point of the solutions were also obtained. In the end, the Ostwald de Waele and Carreau-Yasuda rheological models were applied, where the Carreau-Yasuda model was considered the best for data adjustment as it presented better R2 and lower RMSE values.

13
  • POLLYANA SECUNDO DE OLIVEIRA FERREIRA
  • USE OF KAOLIN WASTE IN THE ADSORPTION OF FOOD DYES

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • ANDREA OLIVEIRA NUNES
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • FRANCISCO WENDELL BEZERRA LOPES
  • Data: 10-oct-2023


  • Resumen Espectáculo
  • Waste is present in industrial processes; therefore, using this waste for a purpose other than disposal creates a new avenue for disposal and sustainable development in the processes. In this way, this study aims to assess the potential use of kaolin waste as an adsorbent for the removal of food dyes present in effluents. To achieve this, the kaolin waste was obtained from an industry in Equador/RN. Subsequently, the waste was characterized through particle size, XRF, XRD, and SEM analyses. Next, pellets were manufactured in the ratio of 10 g of kaolin waste to 3 ml of water, which were then calcined at 800°C for 2 hours with a heating rate of 10°C/min. This material was tested using an adsorption system constructed with easily obtainable laboratory materials such as a graduated cylinder, PET bottle, and faucets. It was verified in the characterization that the main mineral in the waste is kaolinite. In batch tests, the assay that showed the best adsorption capacity was with calcined kaolin powder and Tartrazine Yellow, which was 0.3658 mg/g. However, for a column test, it was observed that the use of calcined pellets was necessary due to their resilience for this operation. Thus, in batch tests with pellets, the one that exhibited the best adsorption capacity was with Tartrazine Yellow and kaolin waste in pellet form, which was 0.2023 mg/g. In comparison to the dyes, it was observed that Tartrazine Yellow exhibited a higher affinity for removal with the kaolin waste. During the column adsorption tests, it was noted that the effluent flow rate is an important factor in the process, as well as the resistance of the pellets. Finally, it is considered that each process has its advantages, and conducting further column tests with constant flow and recycling may yield additional complementary results.

14
  • WILDSON BERNARDINO DE BRITO LIMA
  • Use of Graph Neural Networks to predict the PC-SAFT pure-components parameters: evaluation of vapor pressure and density of non-associable and associable components

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • OSVALDO CHIAVONE FILHO
  • SAMUEL JORGE MARQUES CARTAXO
  • VANJA MARIA DE FRANCA BEZERRA
  • Data: 27-oct-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The modeling of thermodynamic properties is essential for the evaluation and optimization of processes through simulation tools. In this regard, the equations of state have demonstrated great capacity in modeling the most diverse types of molecules. The Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) equation of state is one of the most used models for this purpose, being capable of modeling non-associative, associative, polar and even ionic species. However, to use PC-SAFT, a first necessary step is to perform parameterization with experimental data, with data on saturated liquid density and vapor pressure being minimum prerequisites to ensure the equation of state produces robust results in an application, such as prediction of Liquid/Vapor and Liquid/Liquid Equilibrium. Within the context of bioprocesses, there is greater difficulty in obtaining these experimental data due to both physical and economic constraints. This is the case of ionic liquids and deep eutectic solvents that have attracted much attention from the scientific community in various processes, such as protein extraction. These compounds, however, have negligible vapor pressure, which is one of the properties that make them so attractive. Deep learning models, in turn, despite being unfeasible to model a wide variety of thermodynamic properties, as the equations of state do, are very robust in finding complex patterns that may exist, for example, between molecules and their pure-component parameters. In the present study, two deep learning models of the Graph Neural Networks type were developed to predict the PC-SAFT pure-component parameters, for the hard-chain and dispersion energy, from the molecule graphs, eliminating the experimental data prerequisite. The models demonstrated excellent performance on the test set, composed of non-associative, associative and ionic species. Model 1 presented an mean absolute percentage error of 10.96% and 25.94% for liquid and vapor density and vapor pressure, respectively. Model 2 performed better with 5.03% and 19.22%, respectively. The performance of the parameters predicted by the models was demonstrated with water, furfuranol, ethanol, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-butyl-3-methylimidazolium tetrafluoroborate. The need to predict parameters related to the association and polarity of the PC-SAFT was also identified, in order to use the equation of state at its maximum power.

15
  • FRANCISCO HIGOR VIEIRA DE ANDRADE SILVA
  • Reduced graphene oxide/polyamide Nanocomposite: An efficient nanomaterial applied in produced water (PA) treatment and oil/seawater separation

  • Líder : JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
  • MIEMBROS DE LA BANCA :
  • JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
  • ELISAMA VIEIRA DOS SANTOS
  • EDNEY RAFAEL VIANA PINHEIRO GALVAO
  • MARCOS ALLYSON FELIPE RODRIGUES
  • PEDRO TUPÃ PANDAVA AUM
  • Data: 31-oct-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Contamination derived from offshore oil production and oil spillage at sea has been a major environmental problem. Therefore, the search for effective, sustainable, easy-to-apply and low-cost methods to solve this problem has been the subject of many studies in the last two decades. In addition, research and innovation as a goal in sustainable development, in protecting the environment and the climate and in guaranteeing life in water, are objectives defined by the United Nations so that the 2030 Agenda can be achieved in the world. Thus, synthesizing materials using nanotechnology tools has contributed to achieving these goals. One of the most promising 2D nanomaterials in studies involving environmental issues is reduced graphene oxide (RGO). Produced water (PA) as well as oil removal in seawater. This work was carried out in two stages and in the first, a fluoropolymer/RGO/PA nanocomposite was developed using an HP/HT process followed by spray coating applied in the removal of engine oil in seawater. In the second stage, a nanocomposite was developed in a semi-continuous HP/HT process with in situ reduction of graphene oxide, followed by infrared polymerization. In this step, a 24 factorial design using Design Expert software was used evaluating the factors: temperature (ºC), RGO concentration (mg/L), reaction time (min) and pH were optimized. In both stages, the RGO and the nanocomposites were characterized using DRX, Raman Spectroscopy, SEM-FEG, HRTEM, FTIR and XPS. The results obtained in the first one demonstrated a significant efficiency in the separation of semi-synthetic motor oil in sea water, with an oil removal rate superior to 95%. In the second stage, the results demonstrated a significant efficiency in the contact angle greater than 120° being 55% higher compared to the uncoated polyamide fabric, with a water permeability between 10.1-16.9 mg/cm2.h and an increase in the Oxygen content in the water of 81.8%. It is concluded that the developed nanocomposites present a significant advance in oil/water separation and also in the treatment of produced water from produced water, contributing to environmental preservation and sustainability at sea.

16
  • ARIELLE JOICE FONSECA LOPES
  • USE OF LIGNIN NANOPARTICLES FROM CORCOB AS STABILIZER OG OIL/WATER PICKERING EMULSIONS

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JACKSON ARAUJO DE OLIVEIRA
  • Data: 01-dic-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Plant biomass has three main structural components: cellulose, hemicellulose, and lignin. Cellulose-based products are widely consumed by the population, from packaging, and fuels to energy storage devices, while hemicellulose is used to obtain industrial solvents, such as furfural. Lignin has been applied to obtain heat and electricity in pulp and paper mills. However, it is estimated that the recommended energy of 15%-30% of Kraft lignin, the main lignin technique, is sufficient to maintain the operation of industrial pulp and paper plants, so there is a surplus of the biopolymer. Thus, the improvement of lignin and the development of new applications are na expanding field of research. In this context, the present work aims to add value to lignin, particularly as a stabilizer. The study investigates the performance of lignin nanoparticles as stabilizers of oil-water Pickering emulsions. To this end, corn cob lignin, obtained through alkaline removal, was used. To improve the emulsifying properties of the compound, Chemical oxidation and acetylation reactions were carried out, in addition to the addition of surfactante sodium dodecyl sulfate (SDS), to obtain four different types of lignin. Furthermore, Pickering emulsions were prepared with different concentrations of lignin nanoparticles and using diferente hydrophobic liquids: corn oil, toluene, and n-octanol, to evaluate both the performance of the lignin and the stability of the different systems. Initially, tests were carried out to characterize the lignins, such as their UV profile, FTIR spectra, and manipulation profile in the face of heating by Thermogravimetry. The results of these tests, supported by the literature, indicate the occurrence of the expected chemical modifications, observed by changes in the profile of oxidized, acetylated, and SDS lignins, compared to unmodified lignin. Then, to evaluate the performance of lignin nanoparticles, the average zeta potential and polydispersity of oxidized, acetylated, and SDS-added lignins, as well as the particle size after modification. The results demonstrate that modified lignins, in general, have a higher zeta potential in modulus than the unmodified one, as the latter presented potential of 0.18 and the others of -2.13, -20.44 and 0. 9. A similar increase was observed in polydispersity, which presented a rate of 38.3% in unmodified lignin, 41.1% in acetylated lignin, 94.65% in lignin with SDS and 30.3% in oxidized lignin, which was an exception to the increasing trend and presented values. Regarding size, there was an increase in the size of the modified lignins, which was not expected and may have resulted from particle agglomeration. After analyzing Pickering emulsions, the results show that, in general, the higher the lignin concentration, the more intense the color of the system, the higher the emulsification index, the smaller the diameter of the emulsion droplets, and the greater the number of microcapsules formed. , which converges to a high efficiency of the biopolymer in stabilizing the systems. Furthermore, regarding the systems, toluene had the best performance in emulsification rates, followed by corn oil and n-octanol. Comparing the types of lignins, it was found that the acetylated and surfactant lignins obtained higher emulsification rates and considerably smaller particle diameters compared to the oxidized and unmodified lignins, whose diameters reached twice the diameter of the acetylated lignin and with SDS, under the same conditions. Finally, we observed that almost all lignins led to the formation of PCL microcapsules, except acetylated lignin at a concentration of 1g/L, so that precipitate formation occurred. However, even in this case, increasing the lignin concentration to 2g/L made the formation of microcapsules possible. The sum of the results. The sum of the results converges to the conclusion that lignin has properties that favor its use as a surfactant and, in particular, enable the formation of biodegradable microcapsules, leaving open a field of possibilities for future work capable of developing uses and applications of microcapsules formed from lignin.

17
  • GRAZYELE MEDEIROS DINIZ
  • FORMATION AND CHARACTERIZATION OF ORGANOGELS FOR VITAMIN E DELIVERY

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • ADOLFO LOPES DE FIGUEREDO
  • SUZARA RAYANNE DE CASTRO SENA
  • Data: 11-dic-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Topic drug administration is a non-invasive, easy and advantageous route for the absorption of an active ingredient in the body. As well as in the pharmaceutical area, the cosmetics industry uses this material transfer mechanism in order to prevent degradation caused by interactions with other compounds before absorption through the skin. Among the variety of bioactive delivery systems, organogels have stood out as materials with an interesting structure for the controlled release of bioactive compounds. These materials are semi-solids formed by the mixing of small concentrations of gelator (<15%) and organic solvent. In parallel, an active compound of interest in these areas is vitamin E, an important fat-soluble nutrient, which has antioxidant, humectant and emollient properties, to name a few. In this context, this study aims to prepare and characterize organogels for the delivery of vitamin E for applications in the cosmetics and pharmaceutical industry. Coconut oil (OCO), canola oil (OCA) and oleic acid (AO) were investigated as organic solvents, whereas Tween 80 (T80) and PEG 300 (P300) were investigated as gelators. Firstly, the phase behavior of the systems was studied, and the pseudo-ternary diagrams were constructed. Next, vitamin E was incorporated into the gels, and these systems were characterized through Zeta potential and pH analyses, and the stability and potencial for vitamin E delivery through the gels were evaluated. Finally, the possibility of quantifying vitamin E in the formulations was assessed using the UV spectrophotometry technique.  Solubility tests of the P300-OCO binary mixture indicated a lack of affinity between this structuring agent and the organic solvent. Consequently, PEG-300 was excluded from further investigation. Tween 80 successfully structured the organic solvents in all three studied systems (OCO/T80/water, OCA/T80/water, AO/T80/water), and the gels obtained with the lowest concentration of structuring agent in each system were characterized. Lastly, UV spectrophotometry was not suitable for quantifying the vitamin E incorporated in the gels due to interference caused by the excipients in the absorption of UV radiation at the same wavelength as vitamin E.

Tesis
1
  • KARYN NATHALLYE DE OLIVEIRA SILVA
  • INTEGRATION OF TECHNOLOGIES FOR TREATING SOIL CONTAMINATED WITH ORGANIC COMPOUNDS

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • ELISAMA VIEIRA DOS SANTOS
  • JOSÉ EUDES LIMA SANTOS
  • SALVADOR COTILLAS SORIANO
  • Data: 26-ene-2023


  • Resumen Espectáculo
  • Soil is a recipient of accumulated contamination from industrial, agricultural, urban and maritime activities, so its remediation is crucial for a healthy environment. Thus, there is a need to use effective techniques to remedy contaminated soils, and one of the current challenges is the development of low-cost, efficient and ecologically favorable strategies for the recovery of soil environmental quality. Thus, this work proposed the integration of soil remediation techniques using treatments such as soil washing, permeable reactive barriers and electrochemical oxidation in order to treat soils contaminated with organic compounds. By integrating soil washing with an electrochemically generated persulfate solution aimed at treating soil contaminated with methyl orange (MO), the results indicated that MO was efficiently removed from the soil when a persulfate solution was used in the soil washing procedure. The oxidizing power of persulfate played a key role in eliminating MO from soil and aqueous solutions, preventing the generation of a highly polluted effluent. By integrating soil washing with cork permeable reactive barriers (PRB) in the treatment of soil contaminated with polycyclic aromatic hydrocarbons (PAHs), it was observed that the final washing solutions free of PAHs were obtained. However, the non-polar solvent was partially sorbed onto the cork granules, competing with the PAHs for the cork surface. On the other hand, the solvent content was beneficial for soil washing, improving the elution of PAHs from the soil.

2
  • FERNANDA SIQUEIRA LIMA
  • EVALUATION OF DRUG REMOVAL BY ADSORPTIVE PROCESSES: ISOTHERMAL, KINETIC AND THERMODYNAMIC STUDIES

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO WENDELL BEZERRA LOPES
  • GILSON GOMES DE MEDEIROS
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • RICARDO PAULO FONSECA MELO
  • Data: 03-mar-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Sodium diclofenac (DCF) is an anti-inflammatory with high toxicity and frequently detected in effluents and wastewater treatment plants. Ciprofloxacin (CIP) is an antibiotic that is widely used in clinical and veterinary treatment to prevent bacterial infections, with a high polluting potential. Adsorption using activated carbon has been widely used to remove micropollutants, but this adsorbent requires an expensive and inefficient phase separation step, compromising the efficiency and cost of the adsorptive process. Thus, an innovative and unprecedented process based on ionic flocculation-assisted adsorption (IFAA) using the surfactant sodium dodecanoate was proposed, aiming to increase the adsorption capacity of the process and facilitate phase separation. In the context of the search for bioadsorbents, the potential of sweet sorghum bagasse (NSB) and chemically treated with sulfuric acid (TSB) as adsorbents was also evaluated, aiming to remove DCF and CIP from synthetic wastewater. The efficiency of the processes of adsorption and adsorption assisted by ionic flocculation was evaluated from a kinetic study, equilibrium isotherms, thermodynamic properties and for activated carbon as adsorbent, the kinetics of separation through the sedimentation process was studied. In the study of direct adsorption and IFAA using activated carbon as adsorbent and DCF as a contaminant, the adsorption kinetics followed the pseudo-second order model in both processes. From the equilibrium isotherms, the maximum adsorption capacity obtained was 49.43 and 51.85 mg.g-1 in direct adsorption and IFAA, respectively, being best represented by the Langmuir model. In the sedimentation analysis, it was noticed that the higher the surfactant concentration, the higher the compaction height, the higher the decantation speed and the shorter time to obtain the clarified effluent. In the adsorption of DCF and CIP in NSB and TSB, the chemical treatment carried out in the NSB modified the lignocellulosic composition of this material, reducing the percentage of lignin by 35%, hemicellulose by 26% and increasing the alpha-cellulose content by 20%. The pseudo-second order model was the one that best fitted the adsorption kinetics of DCF and CIP in both adsorbents, as evidenced by the correlation coefficients and the sum of squares of the residues. The equilibrium isotherms obtained with the adsorbents (NSB and TSB) and the CIP were better fitted with the Langmuir model (R² > 0.98). In the case of DCF adsorption, the Freundlich model provided the best fit (R² > 0.99). The thermodynamic analysis revealed that the processes occurred spontaneously, exothermically and that there is a reduction in randomness at the solid-solution interface. The use of IFAA proved to be effective by increasing the adsorption capacity of the DCF, promoting a better phase separation of the constituents (adsorbent and DCF), making the separation faster and more efficient. The ability of NSB and TSB to adsorb DCF and CIP from water was evidenced, highlighting its potential as an efficient, environmentally friendly and low-cost bioadsorbent.

3
  • JÉSSYCA KAENNY DE ANDRADE BEZERRA
  • Evaluation of the phase equilibrium of biodiesel and short-chain alcohol blends with application in diesel cycle engines

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO WENDELL BEZERRA LOPES
  • GILSON GOMES DE MEDEIROS
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • MARIA ROSIANE DE ALMEIDA ANDRADE
  • Data: 11-mar-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The production and indiscriminate use of fossil fuels should decline in the coming decades due to global warming caused by greenhouse gas emissions, which lead to serious climatic disorder. Diversification of the global energy matrix has broadened and strengthened renewable energies and biofuels aimed at combining energy safety with sustainable development. Biodiesel is a feasible alternative to diesel owing to its similar properties and applications, without requiring changes to internal combustion engine. It is superior to fossil fuels because of its biodegradable, sustainable and environmentally friendly nature. This work presents the production of methyl biodiesel using commercial soybean oil in a homogeneous route with potassium hydroxide (KOH) in order to obtain liquid-liquid balance (ELL) data and its applicability in a diesel cycle engine. Initially, a comparison of equilibrium diagrams and an evaluation of thermodynamic models were evaluated between biodiesel (biodiesel + glycerol + methanol) and methyl palmitate, an ester isolated from biodiesel (methyl palmitate + glycerol + methanol). The results showed a good correlation with the UNIQUAC and NRTL models, in addition to showing a diagram with an extensive biphasic region. In order to propose new biofuel formulations, ELL studies in ternary systems were carried out containing Alcohols + Biodiesel + Diesel, focusing on the use of biodiesel as a stabilizing additive for alcohols in diesel mixtures, in other words, the miscibility of ternary systems was investigated. The authenticity of the phase equilibrium data was validated by the Othmer-Tobias and Hand equations. The distribution and selectivity coefficients calculated for the immiscibility regions indicated that the increase in the carbon chain strengthens the biodiesel solubility. The experimental data also correlated with the UNIQUAC and NRTL thermodynamic models. Both models showed high agreement with the experimental data, with deviation values (RMSD) lower than 1.78%. Finally, a diesel engine fed with biodiesel/methanol/n-butanol blended fuel was employed to investigate the effects of different fuel blend ratios and engine load on combustion characteristics in terms of specific fuel consumption and efficiency. brake heat. Two 2³ experimental designs with the addition of three central points were carried out, evaluating the effect of the variables, concentration of additives (methanol and n-butanol), molar ratio (B/M) and potency. Load is the main factor affecting the specific fuel consumption and thermal efficiency of the brake.

4
  • VERUSKA DO NASCIMENTO SIMÕES
  • Seawater desalinization via activated carbon adsorption obtained though elephant grass and sewage sludge pyrolysis.

  • Líder : JOAO FERNANDES DE SOUSA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • JACKSON ARAUJO DE OLIVEIRA
  • JOAO FERNANDES DE SOUSA
  • MARCIO BARBALHO DANTAS BEZERRA
  • RENNIO FELIX DE SENA
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • Data: 16-mar-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The problem of water scarcity is worldwide and reaches considerable proportions in some areas of the planet, due to the significant increase of population in these places and the constant climatic changes that have occurred in the last decades, leading to the need to develop some strategies that can achieve development Desalination is a process whereby seawater is transformed into water that can be used for human consumption, agriculture and industry. Currently, this technique has been increasingly used all over the world. It is worth noting that the use of elephant grass coal and domestic sludge for water desalination is a very attractive option considering that both are low cost materials and an abundant source. The high carbon content in these biomasses makes them economically a precursor material for the production of activated carbon, with good applications for the removal of organic and inorganic compounds, in the treatment of water, wastewater and atmospheric emissions. Thus, the present work is motivated to evaluate the efficiency of the desalination of sea water, using as adsorbent coal from elephant grass and domestic sewage sludge

5
  • MICHAEL SEGUNDO SENA
  • Construction of heterostructured photocatalysts of Cs2AgBiBr6/bismuthene and their application to produce solar fuels from photocatalytic CO2 reduction

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDARAIR GOMES DOS SANTOS
  • ANDRE LUIS LOPES MORIYAMA
  • ANDREA OLIVEIRA NUNES
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • VIVIAN STUMPF MADEIRA
  • Data: 28-mar-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Photocatalytic CO2 reduction is a process that uses light energy and photocatalysts to convert CO2 molecules into solar fuels such as H2 and CH4, which are considered promising energy sources due to their high energy density and potential for storage. This process can help address the challenges of sustainable energy production and environmental protection by reducing greenhouse gas emissions as well as providing a way of storing renewable energy. Lead-free halide perovskites have recently been explored as promising materials for photocatalytic CO2 reduction as they offer a safer alternative to traditional lead-based halide perovskites and have shown encouraging results in photocatalysis. Among them, Cs2AgBiBr6 is a double perovskite that stands out as a remarkable alternative due to its non-toxicity, excellent optoelectronic properties and multifunctionality. However, the application of Cs2AgBiBr6 is limited by its low efficiency of separation of photogenerated charges. In this respect, this work reports the synthesis and characterization of Cs2AgBiBr6/bismuthene composites through a selfassembly process of Cs2AgBiBr6 nanoparticles on two-dimensional bismuthene nanosheets with improved photocatalytic activity for CO2 reduction. The optimized Cs2AgBiBr6/bismuthene nanocomposites show a photocatalytic activity of 14,79 (±1,66) μmol g–1 h –1 on an electron basis with 1 sun, with a CH4 selectivity of 81 (±1) %. The improved photocatalytic performance is attributed to their improved charge mobility and suppressed electron–hole pares recombination, along with extended light absorption capacity promoted by the heterojunction of bismuthene with the perovskite.

6
  • ALANA CAROLYNE CRISPIM
  • Electrochemical technology for the treatment of landfill leachate

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DANYELLE MEDEIROS DE ARAUJO
  • ELISAMA VIEIRA DOS SANTOS
  • JOSÉ EUDES LIMA SANTOS
  • JOÃO MILLER DE MELO HENRIQUE
  • Data: 11-abr-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Most solid waste ends up in landfills around the world, which hurts the environment in a number of ways. In particular, rain and waste decomposition in landfills result in the production of an aqueous leachate containing compounds with low biodegradability, high toxicity, and high organic load. To prevent the introduction of this toxic mixture into the environment, remedial measures are necessary. Electrochemical technologies are particularly suitable for wastewater purification and contaminant reuse. Therefore, in this study, the application of electro Fenton (EF) and photo electro Fenton (PEF) processes was investigated to treat local landfill effluent with high conductivity (k = 15.8 mS cm-1) and high organic content (total organic carbon (TOC) = 1220 mg L-1). Specifically, a flow cell containing a boron-doped diamond (BDD) anode and a carbon felt (CF) cathode was developed to evaluate the effects of applied current density (30, 60 or 90 mA cm-2), production of H2O2, and the source of UV radiation (UVC and UVA) on the chemical oxygen demand (COD) of the effluent. In addition, acetic and formic acids (final organic by-products of effluent degradation), as well as inorganic ion concentrations (Cl-, NO2-, NO3- and NH4+ and PO43-) were evaluated. Maximum degradation and mineralization of the effluent were obtained with increasing applied current density, at which more than 90% of the total organic carbon (TOC) was removed after 240 min of PEF UVC with the BDD anode at 90 mA cm-2. Therefore, EF and PEF are efficient and effective solutions for the remediation of organic pollutants in landfill effluents, especially when using the BDD anode. The integration of technologies for wastewater treatment can significantly increase the degradation efficiency of organic compounds, as well as make electrochemical technologies a sustainable alternative, through the use of renewable energy for the treatment of leachate from landfills in low-income countries.

     

7
  • RONALDO DOS SANTOS FALCÃO FILHO
  • OBTAINING PHOTOCATALYTIC CERAMIC MATERIALS OF Nb2O5 IMMOBILIZED ON RED CERAMIC SUPPORTS FOR REMOVAL OF CONTAMINANTS FROM EFFLUENTS
     
  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • YARA FELICIANO GOMES
  • ARISTIDES FELIPE SANTIAGO JUNIOR
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • Data: 26-jun-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The objective of this work was to produce ceramic materials with photocatalytic property of Nb2O5 immobilized on a red ceramic support capable of removing micropollutants from synthetic effluents. For this purpose, two different types of ceramic materials were produced: in the first type, Nb2O5, in different proportions ranging from 10.8% to 19.2%, was incorporated into treated common clay and the mixture was homogenized with water to form a plastic mass that was moulded, dried and, finally, the materials were thermally treated at temperatures between 850°C and 1020°C; in the second type, the photocatalytic material was produced by applying a coating with 60% Nb2O5 on a red ceramic support, which was prepared similarly to the first type, but was only fired at 850° C. The materials were characterized by granulometric analysis, hygroscopic humidity, FRX, DRX, SEM, ERD, ATG, PCZ, technological properties. A DCCR-type experimental design with 22 factorial runs, 2.2 axial runs and 2 runs at the central point was used to choose the material with incorporated Nb2O5, using methylene blue (AM) dye removal as a response variable, thus, the material produced with 15% Nb2O5 and a burning temperature of 850° C was chosen because it removes 80.26% of the AM concentration. In the case of the material coated with 60% Nb2O5, as it was the only one, it was evaluated for AM removal as a function of the pH (5, 7 and 9) and [H2O2] (0, 50 and 100 mg/L) variables, in this case, a planning of the DCC-FC type was used with 22 factorial runs, 2.2 axial runs and 2 runs at the central point, the evaluation of the obtained model showed that the variable [H2O2] was not significant, in the range studied, and the Optimal pH for AM removal was 8.0. The material with incorporated Nb2O5 presented Eg = 1.95 eV and the one with 60% Nb2O5 coating presented Eg = 2.94 eV. In addition, both types of materials showed excellent regeneration capabilities after 5 cycles, maintaining removals close to 90%. The photocatalytic materials produced with Nb2O5 immobilized on red ceramic supports showed the ability to remove AM in synthetic effluent, with the material coated with Nb2O5 promising because it presents Eg close to that of the pure oxide, simplicity of obtaining, high removal and recovery capacities.

8
  • RAFFAEL ANDRADE COSTA DE MELO
  • RECYCLING OF PRINTED CIRCUIT BOARDS FROM OBSOLETE DESKTOPS COMPUTERS THROUGH HYDROMETALLURGICAL PROCESSES

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • CARLSON PEREIRA DE SOUZA
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • MARIA DO SOCORRO BEZERRA DA SILVA
  • POLLYANA SOUZA CASTRO
  • Data: 27-jun-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Currently, waste electrical and electronic equipment (WEEE) has become an environmental problem that must be managed responsibly, as well as an economic resource that must be exploited in a viable way. For example, printed circuit boards (PCBs), which form part of most WEEE, are made up of hazardous materials such as heavy metals and flame retardants, as well as valuable materials such as base and precision metals, so they must be treated properly. In view of this, the scientific community has dedicated itself to the recovery of this residue. Therefore, the objective of this work is to study the recycling of PCBs from obsolete desktop computers through hydrometallurgical processes, more precisely the modeling and optimization of copper leaching with nitric acid and depolymerization with benzyl alcohol and potassium hydroxide through an experimental design composed central. Therefore, the PCBs were initially pre-treated (dismantled, cut, milled and sieved) to obtain a pulverized material with a granulometry smaller than 2 mm. After that, the pulverized PCBs were characterized through different analyzes (granulometric classification, incineration, digestion in aqua regia, XRF, XRD, ICP-AES, SEM and EDS). Then, the first study evaluated the effects of acid concentration (from 0.2 to 4.2 mol/L), temperature (from 30 to 90 °C), solid/liquid ratio (from 10 to 90 g/ L of PCI/solution) and time (from 30 to 150 minutes) on the copper leaching efficiency determined by molecular absorption spectroscopy analyzes in the ultraviolet-visible (UV-Vis) region. The second study evaluated the effects of hydroxide concentration (from 0.10 to 0.90 mol/L), PCI mass (from 1 to 9 g) and temperature (from 50 to 150 °C) on the efficiency of depolymerization in benzyl alcohol determined by mass balance. The adjusted statistical models for both processes proved to be significant and predictive (R² close to or greater than 0.9) and their optimization resulted in complete recovery of the copper and polymeric fraction of the PCI. Finally, the present study contributed to the development of two viable hydrometallurgical routes for PCB recycling.

9
  • POLIANA PINHEIRO DA SILVA
  • USE OF GREEN COCONUT SHELL POWDER FOR THE PRODUCTION OF LEVULINIC COMPOUNDS

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • LEONETE CRISTINA DE ARAUJO FERREIRA MEDEIROS SILVA
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • PAULA FABIANE PINHEIRO DO NASCIMENTO
  • Data: 10-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Agro-industrial residues are most often widely disposed of in landfills or in an uncontrolled manner. An environmentally friendly alternative can be the use of this residual biomass for the production of sustainable chemicals with high added value. Levulinic acid and its derivatives are examples of these products, which have high added value and can serve as precursors for various industrial products and also used as fuel additives. The thesis study is divided into three main stages that aim to study the feasibility of converting coconut husk powder into levulinic acid. The first determined the biomass composition before and after esterification through thermal analysis; there was a reduction in the amounts of cellulose (18.18% to 9.77%) and hemicellulose (44.65% to 26.18%) after the reaction. Then, the degradation kinetics of the coconut husk powder was carried out using the Ozawa–Flynn–Wall method, which demonstrated that the activation energy is directly related to the presence of hemicellulose and cellulose, increasing from 143 kJ.mol- 1 for 125 kJ.mol-1. The second stage consisted of the synthesis of levulinic acid generated from the powder of green coconut shell. The reactions took place in a Parr Instruments stainless steel reactor, with a capacity of 300 mL, and the samples were analyzed on HPLC. The reaction conditions were determined according to a factorial design with the addition of 3 points, temperature, time and amount of catalyst being the three significant. The response variable was the yield of levulinic acid, which reached a maximum of 42.94% in the central conditions (190 ºC, 2h, 1:0.25). The third study comprised a three-factor Box-Behnken (PBB) design, with the response being the conversion of levulinic acid into ethyl levulinate. The highest conversion occurred in 1hrs, molar ratio (levulinic acid: ethanol) 4:1 and catalyst concentration 0.04mol/L. Then, a comparison was made between the synthesis of methyl and ethyl levulinate, where it was noticed that the only significant factor in both reactions was time.

10
  • HERBERT SENZANO LOPES
  • Development of a simulator using Visual Basic for Applications for photocatalitic processes of transformation

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • CARLSON PEREIRA DE SOUZA
  • OSVALDO CHIAVONE FILHO
  • PATRÍCIA CRISTINA DE ARAÚJO PUGLIA DE CARVALHO
  • VANJA MARIA DE FRANCA BEZERRA
  • Data: 31-jul-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The main goal of this doctoral dissertation work was to apply the Excel® spreadsheet tool in the development of photocatalytic transformation process simulators. Toluene photodegradation and methane photoreform were the study cases evaluated for the process simulator. The Visual Basic for Applications (VBA) programming language has been applied to numerical methods and the generation of graphs and an user-friendly interface. The accessibility of Microsoft® programs is also noteworthy, making it more available tool for solving process engineering problems. A model system of the literature describing the kinetics of the catalytic oxidation reaction of toluene was simulated. The concentration profile of the contaminant (toluene) was obtained as a function of the position in the reactor and also of the input data. In explanation, the system and reaction information can be changed to allow the analysis of different reactor dimensions, flow rates, initial concentrations, reaction rates and catalyst characterization parameters. The photocatalysis study was also performed considering a photoreform between methane and water vapor for methanol production. The catalyst is in a fixed bed and accessible to radiation. The simulation was performed considering the model as one-dimensional and steady state. The obtained results were satisfactory for the methane conversion velocity, as well as photoreactor dimension values. For the initial operating conditions the photoreactor length values were 20 cm and radius of 4 cm. The results showed that the developed tool allows the simulation and analysis of the photocatalytic reactions of the systems in relation to the most significant variables and parameters of the process under study.

11
  • MAXWELL GOMES DA SILVA
  • Synthesis and application of superparamagnetic nanoparticles in the microchannel magnetophoresis process: experimental study and fluid dynamic modeling

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • FABRICIO MACHADO SILVA
  • JACKSON ARAUJO DE OLIVEIRA
  • Data: 11-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Magnetic iron oxide nanoparticles have attracted great interest from researchers because of their vast application potential that ranges from magnetic recording, magnetic resonance imaging, and drug delivery to ferrofluids, catalysis, and separation processes. Magnetite (Fe3O4) is one of the phases of iron oxide with the greatest magnetism, which is composed of cations Fe2+ and Fe3+ in a 2:1 molar ratio. Magnetite nanoparticles can be synthesized by several methods which must be selected according to the type of application. In this work, superparamagnetic Fe3O4 nanoparticles were synthesized by reverse coprecipitation and partial oxidation of Feions2+. The magnetic precipitates were characterized by infrared spectroscopy, Raman spectroscopy, X-ray diffraction, vibrating sample magnetometry, dynamic light scattering, scanning electron microscopy, and thermal analysis. The thermal stability of the particles in air was evaluated and a study of thermal decomposition kinetics was carried out using the model-based approach. The results showed that the nanoparticles produced exhibited superparamagnetic properties at room temperature with mean diameters of 10 and 30 nm and saturation magnetizations of 35 and 64 emu/g for the samples synthesized by reverse coprecipitation and partial oxidation of Fe2+ ions, respectively. The magnetic nanoparticles obtained by reverse coprecipitation presented higher thermal stability than the nanoparticles synthesized by partial oxidation of Fe2+ ions. The kinetic parameters of thermal decomposition were estimated and the kinetic model fit showed a good correlation with the experimental data (R2 = 0.988). To evaluate the application potential of the synthesized particles, magnethophoresys experiments were carried out in a Y-Y type microchannel fabricated by 3D printing technology. Different separation profiles were obtained at different conditions of magnetic field gradient inside the device. a computational fluid dynamics model coupled with a discrete element model was implemented in MATLAB® using the Eulerian-Lagrangian approach to simulate the magnetophoresis process. The magnetic force acting on the system was simulated from a magnetic field model based on the charge model. The experimental saturation magnetization and particle size distribution data were used as model parameters for simulations. The results demonstrated that the model is capable of predicting different scenarios of particle trajectory changes according to variations in the magnetic field gradient inside the channel. In addition, the fluid dynamics model was validated with the experimental data and presented coherent results, which make it useful for understanding the characteristics of the process, as well as in the optimization of operating conditions and design of new microdevices.

12
  • DANIEL SILVEIRA LIRA
  • Development of a Biodiesel Production Process in a Membrane Reactor

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JACKSON ARAUJO DE OLIVEIRA
  • JUAN ALBERTO CHAVEZ RUIZ
  • LIANA FRANCO PADILHA
  • Data: 15-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The concern with global warming has turned necessary the development of viable alternatives to fossil fuels. So, the development of renewable fuels, also known as biofuels, has gained importance. Among the existent biofuels, biodiesel can be highlighted. Biodiesel is a chemical compound formed by esters, which can be methyl or ethyl. Due to their physical and chemical properties, they can be used as a substitute to diesel of fossil source in Diesel cycle motors. Nowadays, the biodiesel production in industrial scale is made, mainly, in batch or continuous stirred tank reactors, which present several dificulties and limitations in productivity and conversion, besides the need for various posterior separation steps. Much effort is being done to develop novel processes that unite reaction and separation steps in one. As result, the membranes emerge as an alternative with great potential of application in the production of biodiesel as a reaction media. Membranes can be defined as selective, partially permeable mediums and are vastly used in many separation processes. In this context, the present work has the aim to develop a continuous process for the production of biodiesel using a membrane reactor from soybean oil, in addition to propose a mathematical model which describes the process in question, from mass and energy balances.

13
  • EDILENE SOUZA DA SILVA
  • Evaluation of freeze-dried and spray dried acerola and jambolan residues: process life cycle assessment and final product characterization - physicochemical, bioactive and bioaccessibility assessment.

  • Líder : ROBERTA TARGINO HOSKIN
  • MIEMBROS DE LA BANCA :
  • LUCICLEIA BARROS DE VASCONCELOS
  • ANDREA OLIVEIRA NUNES
  • CARMEN SILVIA FAVARO TRINDADE
  • MARCIA REGINA DA SILVA PEDRINI
  • ROBERTA TARGINO HOSKIN
  • SILVANA MARIA ZUCOLOTTO LANGASSNER
  • Data: 25-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Brazil is a country of great biodiversity with tropical fruits of high economic value and, others still underexploited. While acerola has a well stablished market, jambolan is an underexploited fruit. Both residues present high bioactive concentration and will be studied in the present research. In fact, the residues represent up to 10-30% of the fruit weight, and contain biomolecules of economic value that are still underused. It is expected that proper management of these residues can generate food products with functional potential by using drying techniques such as freeze-drying and spray drying to expand their market value and and add value to this agricultural raw material. In this regard, the use of ultrasound for extract preparation is reported to increase the extraction of bioactive compounds and improve drying. Furthermore, assessing drying processes for environmental impact is of great importance for the development of environmentally friendly processes, and can be assessed by tools such as Life Cycle Assessment (LCA). Therefore, the present doctoral project aims to study the use of acerola and jambolan residues with the use of freeze-drying and spray drying and will be conducted according to the following stages. i) Evaluation the use of ultrasonic extraction to enhance bioactive extraction that will be further dried; ii) application of the Life Cycle Analysis tool and compare the techniques regarding energy consumption; iii) study the final product regarding its bioactive, functional characteristics and bioaccessibility.

14
  • LUANA RABELO HOLLANDA
  • Applicability of iron-based waste as Fenton catalysts for phenol degradation

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS NOVAIS MOTA
  • DOUGLAS DO NASCIMENTO SILVA
  • EDSON LUIZ FOLETTO
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • OSVALDO CHIAVONE FILHO
  • Data: 31-ago-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Contamination of water bodies by organic compounds has been a matter of great concern due to its impacts on human health and the environment. Phenol is a highly toxic compound commonly found in industrial effluents due to its high use in several segments. Advanced Oxidative Processes (AOP), which encompass a wide range of techniques for generating reactive radicals, have shown satisfactory efficiencies in the degradation of recalcitrant organic compounds. The heterogeneous Fenton reaction is a type of AOP that employs hydrogen peroxide and solid catalysts containing iron for generating reactive species. This study aimed to investigate the potential application of two industrial waste materials as alternative catalysts in the Fenton reaction for the degradation of phenol in water: coal bottom ash from a thermoelectric power plant and amethyst mining residue (AMR). The materials were characterized using different techniques, such as X-ray diffraction, X-ray fluorescence, scanning electron microscopy coupled with energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and textural analysis. Bottom ash was applied in the Fenton reaction, while AMR was used in the photo-Fenton system. The effects of different operational parameters, including solution pH, catalyst dosage, and H2O2 concentration, were investigated. The characterization results indicated that both materials have mesoporous structures with well-distributed active iron species. Regarding the bottom ash, under optimal conditions, which involve the use of 1 g L-1 of catalyst, 6 mM H2O2, and pH = 3, a phenol degradation efficiency of 98.7% was observed after 60 min of reaction, along with 71.6% organic carbon removal after 150 min. AMR, used in the photo-Fenton reaction, exhibited 96.5% degradation under optimal conditions (0.75 g L-1 of catalyst, 7.5 mM H2O2, and pH = 3) after 180 min, removing 42.3% of the organic carbon after 240 min. Through tests with the addition of isopropanol, it was verified that the hydroxyl radical is the main oxidizing agent involved in the cleavage of the phenol molecule for the two studied systems. Regarding the reuse tests, both catalysts showed stability and satisfactory catalytic activity through four consecutive cycles. Therefore, the obtained results demonstrate that the two waste materials displayed potential activity for application in Fenton reactions for degrading phenol.

15
  • NEWTON CARLOS SANTOS
  • INFLUENCE OF PRE-TREATMENT WITH ETHANOL ON DRYING AVOCADO PULP IN A FOAM LAYER AND ITS APPLICATION IN BAKERY PRODUCTS

  • Líder : MARCIA REGINA DA SILVA PEDRINI
  • MIEMBROS DE LA BANCA :
  • MARCIA REGINA DA SILVA PEDRINI
  • THAYSE NAIANNE PIRES DANTAS
  • ANASTACIA MARIA MIKAELLA CAMPOS NOBREGA ANDRE
  • ISANNA MENEZES FLORÊNCIO
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • TAMIRES DOS SANTOS PEREIRA
  • Data: 17-oct-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The use of pre-treatments to enhance food drying is effective, ensuring high-quality products and energy savings. Foam-mat drying is a versatile and cost-effective technique suitable for incorporating new materials into foam formation. These powders have broad applications in the development of new food formulations. In this context, this research aims to evaluate the influence of ethanol pre-treatment on the foam-mat drying of avocado pulp, with the aim of using the powder in bread making. For this purpose, avocado pulp foam was prepared using goat milk powder (10, 15, and 20%), Emustab® (4, 6, and 8%) with different agitation times (15, 20, and 25 min). The foam that exhibited the most suitable physical properties was subjected to the drying process (50, 60, and 70 °C), with or without ethanol pre-treatment (99.5%). Empirical and diffusive models were used to describe the drying kinetics and determine the activation energy of the process and thermodynamic properties. The final products were characterized in terms of physicochemical, nutritional, bioactive, antioxidant, morphological, structural, and thermal aspects. Additionally, the stability of carotenoids was assessed, and water adsorption isotherms were determined. Finally, sliced bread was prepared using different concentrations of avocado pulp powder (0, 5, 10, 15, 20, and 25%) as a substitute for hydrogenated vegetable fats. In this study, the optimized conditions for avocado pulp foam production were with 8% Emustab®, 20% goat milk powder, and 15 minutes of agitation. Foam drying was best represented by the Lewis model, especially when combined with ethanol pre-treatment and higher temperatures (70 °C). These conditions also improved various characteristics of the final product, including reduced water content, water activity, increased ash and carbohydrate content, as well as the content of phenolic compounds and antioxidant activity. Morphological, structural, and thermal analyses revealed irregular, amorphous particles with no formation of new functional groups and heat stability. However, the thermal stability of carotenoids decreased during storage, and water adsorption isotherms showed a Type III curve, with satisfactory estimates by the GAB model. Levels of up to 25% proved suitable for replacing hydrogenated fats, resulting in products with lower lipid and carbohydrate content, higher nutritional value, antioxidant activity, and changes in the structure and color of the bread. In conclusion, this study demonstrated that ethanol pre-treatment and foam-mat drying of avocado pulp are effective strategies for producing high-quality powder with broad applications in the development of food formulations.

16
  • GUILHERME MENTGES ARRUDA
  • DEVELOPMENT AND EVALUATION OF ACID SOLUTIONS CONTAINING POLYETHOXYLATED NONYLPHENOLS AND ETHANOL FOR THE ACID STIMULATION OF CARBONATE MATRICES

  • Líder : ALCIDES DE OLIVEIRA WANDERLEY NETO
  • MIEMBROS DE LA BANCA :
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • DENNYS CORREIA DA SILVA
  • EDNEY RAFAEL VIANA PINHEIRO GALVAO
  • MARCOS ALLYSON FELIPE RODRIGUES
  • MARCIO AUGUSTO SAMPAIO PINTO
  • TULIO YTERBIO FERNANDES VALE
  • Data: 17-oct-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • During the different stages of well development and reservoir exploration, there is the possibility of the occurrence of unwanted phenomena that alter the permeability of the region (formation damage), compromising the production of hydrocarbons. The well stimulation techniques seek to bypass or reverse this damage and, consequently, increase production. Matrix acidizing in carbonates consists of injecting an acidic fluid into the well to increase its production by dissolving the rock matrix itself, creating pathways known as wormholes. Hydrochloric acid (HCl) is the most used substance to stimulate production or injection wells in carbonate reservoirs. However, the high reaction rate of HCl with carbonate reduces its penetration into the rock formation since the acid reacts excessively with the surface of the reservoir (face dissolution). Thus, to minimize acid consumption and increase the depth of wormholes, it is necessary to develop stimulation fluids containing additives that reduce the dissolution rate of the carbonate matrix by acid. The present study aims to develop stimulation fluids and investigate the physicochemical phenomena of alcoholic micellar systems containing ethanol, 15% HCl (w/w) and polyethoxylated nonylphenol with 11, 40 or 100 ethoxy groups (NP 11EO, NP 40EO or NP 100EO, respectively) in the creation of wormholes in acid stimulation processes in carbonates. To do so, characterization analyses will be carried out for the fluids developed and carbonate samples. In addition, compatibility tests of the components of the developed fluids, reactive flow in porous media tests (injection of the formulations in rock samples) and computerized microtomography of acidified rocks will be performed. Therefore, it is expected to obtain delayed action stimulation fluids that are stable, easy to prepare and with adequate physicochemical characteristics for a more efficient acid stimulation of carbonate matrices.

17
  • MARCELL SANTANA DE DEUS
  • Production of Biodiesel in Atomization Reactor

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JACKSON ARAUJO DE OLIVEIRA
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 27-oct-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Biodiesel is an alternative fuel widely used for partial or total replacement of fossil fuels. Although biodiesel production is undoubtedly a mature technology, there are still ways to improve it, especially through the process intensification. So, the present study investigated the esterification of oleic acid with ethanol and the transesterification of sunflower oil with ethanol for biodiesel production in a non-conventional atomization reactor. The effects of the oleic acid and sunflower oil flow rates, atomization pressure, temperature and catalyst concentration were evaluated. A mathematical model was also developed to describe the conversion of oleic acid to ethyl ester as a function of molar concentration of components and operating conditions of the reactor. A hybrid estimation of parameters (activation energy, pre-exponential factor, equilibrium constants, and solubility) was performed. In the esterification, the Pareto analysis has shown that the increase of temperature in the reactor and the increase of atomization pressure have improved the conversion of oleic acid. Higher pressure values in the atomization vessel led to the generation of small oleic acid and sunflower oil droplets, which accelerated reagent consumption during the reaction. On the other hand, conversion values are reduced by increasing oleic acid flow rate. In the transesterification, it was observed that the miscibility of sunflower oil in ethanol influenced the conversion. In addition, the flow rate had a negative effect, and the pressure had a positive effect on the conversion of sunflower oil. Droplet size distribution analysis showed that increasing pressure in the atomization chamber led to a reduction in droplet size, which explains the effects on ethyl ester conversion. The highest conversion of oleic acid was obtained under the following reaction conditions: 70 C, 1.5 bar, oleic acid flow rate equal to 1.3 g/min using 0.6% catalyst, and 2 h of reaction time. In the transesterification, conversions of 97.3% were obtained with a flow rate of 3 g/min of sunflower oil at 50 C, 1.5 bar and 1.0% of catalyst in 1 h. The mathematical model achieved good fit with independent experimental data and the parameters obtained from the hybrid estimation strategy were in accordance with the literature.

18
  • JULIENE DA CÂMARA ROCHA
  • Use of choline chloride during the pretreatment and assessment of hydrolysis enzymatic stage of pretreated green coconut fibers to produce 2G ethanol.

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • NATHALIA SARAIVA RIOS
  • SHARLINE FLORENTINO DE MELO SANTOS
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 19-dic-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • O

    One way for coconut companies to increase their cost-benefit and reduce the dependence on non-renewable energy sources is by using green coconut fibers (GCFs) in value-added products. In this study, GCFs were pretreated with choline chloride ([Cho][Cl]) in an acidified medium with diluted sulfuric acid to enrich cellulose on the solid fraction and lignin on the liquid fraction. The aim was to evaluate the feasibility of obtaining 2G ethanol from simultaneous (SF) and semi-simultaneous fermentation (SSFS) strategies. The study also examined the recycling of pretreatment effluents and their impact on enzymatic hydrolysis and fermentation stages. The pretreatment was conducted in an autoclave (1 atm, 121 °C) without or with diluted sulfuric acid (1.0%, w/w), using different concentrations of [Cho][Cl] (50 and 75%, w/w) and incubation times (25 and 50 min). The pretreated GCFs were then submitted to enzymatic hydrolysis (20 FPU/g), and the best condition was chosen for the SF and SSFS fermentation processes. Additionally, the research has investigated the removal of lignin from the liquid fraction for use as a coagulating agent in oil-contaminated water. The results showed that pretreatment with [Cho][Cl] at a concentration of 75% (w/w) in 50 min of reaction time and an acidified medium with 1% (w/w) of diluted sulfuric acid (C75/50m/H) as the best pretreatment to increase the conversion of cellulose into glucose, reaching 22.6 g/L of free sugar. The SSFS achieved the best efficiency of 32.43% (23.2 g/L alcoholic concentration) and a productivity of 0.483 g/L.h for the condition of 20% solid load in obtaining 2G ethanol. Furthermore, 82.6% of the lignin was recovered from the liquid fraction of this same pretreatment, wherethe application of lignin in the treatment of water contaminated with oil achieved removal of 99% of oil from the aqueous phase. Therefore, GCF pretreated with choline chloride has the potential for 2G ethanol production. Furthermore, the use of lignin generates an adsorbent with the potential to be used in different processes, including in the petroleum industry.

    Keywords: green coconut fiber, pretreatment, choline chloride, ethanol 2G, contaminated water.

     

19
  • LARISSA AZEVEDO SOARES
  • Influence of treatment processes on the production of activated carbons from sugarcane bagasse and study of the optimization of the dye adsorption process through statistical analysis

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • CARLSON PEREIRA DE SOUZA
  • MAYARA FELICIANO GOMES
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • Data: 21-dic-2023


  • Resumen Espectáculo
  • The present work aims to evaluate the influence of the process flow and chemical agents in the preparation and characterization of activated carbon (AC) having sugarcane bagasse as a precursor, to determine the efficiency of adsorption of the dyes Methylene Blue (AM ) and Erionyl Yellow A-R (EY), as well as using statistical techniques in order to evaluate and optimize the different parameters of the adsorption process of these dyes on activated carbon. In this study, 4 different types of activated carbon were obtained and these were characterized by the techniques of XRD, FRX, SEM and N2 Volumetry, Zeta Potential and ability to remove methylene blue dye (MA). The coal whose best results were obtained, reaching surface area values of about 1200 m2.g-1, was used in the other tests that followed with adsorption of dyes. The adsorption assays for AM were carried out by varying the CA mass, pH and temperature of the medium. Through the statistically obtained data, it was verified that the variables studied presented significant and predictive effects, within the range of experimental levels studied, extrapolating the reference line corresponding to the 95% confidence interval. It was also verified that the assay using 10mg of CA, at 27°C and pH 2 obtained the highest amount of dye adsorbed by activated carbon (q), reaching a value of up to 288.4 mg/g. Still for Methylene Blue, the equilibrium, kinetics and thermodynamic factors were studied, under the conditions optimized by the experimental design. As for the statistical studies with EY, they were performed by varying the pH and temperature of the medium. It was found that the variables studied showed only significant effects and that the test at 30°C and pH 2 obtained the highest amount of dye adsorbed by activated charcoal (q), reaching a value of 61.1 mg/g.

20
  • JÉSSYCA EMANUELLA SARAIVA PEREIRA
  • Valorization of lignocellulosic waste as bioadsorbents for copper ions and development of a colorimetric sensor based on sodium levulinate for their detection

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • FRANCISCO WENDELL BEZERRA LOPES
  • PAULA FABIANE PINHEIRO DO NASCIMENTO
  • RICARDO PAULO FONSECA MELO
  • Data: 29-dic-2023
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In recent years, humanity has advanced in many ways, but it has also caused serious damage to the environment. Human activities such as burning fossil fuels, deforestation and waste production have generated pollutants that affect air, water and soil quality. In this scenario, the contamination of water bodies has become a serious environmental problem due to issues related to the improper disposal of effluents contaminated by heavy metals. As a result, this heavy metal pollution has serious consequences for the health of people and ecosystems. In light of these facts, this thesis aimed to evaluate the potential of using bioadsorbents obtained from cashew leaves (CL), carnauba straw (CS) and the extraction of lignin from green coconut fiber (GCF) to remove copper ions from synthetic effluents. Nevertheless, the feasibility of using an organic molecular sensor obtained from the synthesis of sodium levulinate (NaLev) for the colorimetric detection of copper ions was evaluated, which constitutes a simple and efficient alternative for on-site analysis of metal ions in aqueous solution. To this end, adsorption studies were carried out in a batch system and the effects of pH, adsorbent concentration, particle size and initial adsorbate concentration were evaluated. In order to extract the lignin from the GCF, an alkaline pre-treatment with 2% sodium hydroxide was carried out, followed by impregnation with sodium octanoate to improve the adsorption capacity of this bioadsorbent. NaLev was synthesized by hydrating levulinic acid with distilled water and adding 20 g of sodium hydroxide.  The concentrations of copper, NaLev and then the Cu-NaLev mixture were determined by molecular absorption spectroscopy in the ultraviolet and visible (UV-Vis) regions. The effects of different concentrations of copper ions and NaLev on the maximum absorbance and wavelength were evaluated. The experimental CS data were best fitted by the Langmuir monolayer model, while the CL data were fitted by the Freundlich model. For the same experimental conditions, the maximum adsorption capacity for copper (II) was 9.51 mg.g-1 and 1.73 mg.g-1 for CS and CL powders, respectively. For GCF lignin impregnated with surfactant, the results of the adsorption study revealed that the adsorption capacity improved due to the increase in the number of functional groups on the bioadsorbent surface. The results of the calorimetric sensor evaluation showed that the addition of NaLev significantly increased the absorbance as the wavelength decreased from 810 to 575 nm in the samples without and with NaLev, respectively. In addition, the color intensity of the solution containing copper ions increased as the concentration of NaLev increased. The results showed that it is feasible to use lignocellulosic biomass to remove copper ions since the removal capacity is similar to other traditional sources of adsorbents. It was also observed that alkaline pre-treatment and impregnation using the surfactant carried out in the GCF was effective in obtaining a bioadsorbent with adequate copper ion removal capacity. Finally, the NaLev colorimetric sensor for detecting copper ions appears to be a promising class of biobased heavy metal-free colorimetric sensors

2022
Disertaciones
1
  • AMANDA BEATRIZ MONTEIRO LIMA
  • CHARACTERIZATION AND APPLICATION OF THE CONTINUOUS FLOW ELECTROCHEMICAL REACTOR FOR THE DEGRADATION OF ORANGE METHYL DYE

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • ALINE MARIA SALES SOLANO
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DANYELLE MEDEIROS DE ARAUJO
  • ELISAMA VIEIRA DOS SANTOS
  • Data: 31-ene-2022


  • Resumen Espectáculo
  • Appointed as one of the most polluting industries in the world, the textile industry is also responsible for the generation of the highest volume of residual effluents. The external effluents contain large quantities of corants that are highly toxic, carcinogenic, persistent and represent a great threat to the environment and to human health, also requiring adequate treatment before being discharged from our receiving bodies. In this context, in search of technologies capable of minimizing the effects generated by these pollutants, the attention of the scientific society is increasingly becoming more and more necessary. Thinking about it, the Advanced Oxidative Electrochemical Processes (PEOAs) offer a promising approach to prevent two problems caused by this type of effluent, including the use of electrochemical reactors in order to optimize these processes. The present work seeks to characterize the eletrochemical reaction of continuous flux with different starts and study its application using the electro-oxidation / Eletro-Fenton process of degradation of the synthetic Corant Alaranjado de Metila (AM) for the best condition according to the mass transfer coefficient, assessing corrode and decay removal from core concentration over a long period of time. Through the study of hydrodynamics of the reactor, it is possible to observe a predominantly turbulent scorching regime for situations with an experimental mass transport constant superior to or theoretical, indicating that mass transfer is not homogeneous due to the presence of electrode gases. Through the analysis of core degradation and core removal, it is possible to analyze that the difference in relation to the value of the mass transfer coefficient does not significantly affect our efficiency results, since the final values are approximate both for the valve situation ( melhor condição) quanto for a situation with vazão i (pior condição). Furthermore, with little influence two K values can also be observed in the electrogeration of hydrogen peroxide.

2
  • SUELYA DA SILVA MENDONÇA DE PAIVA
  • Environmentally sustainable green hydrogen production

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • ELISAMA VIEIRA DOS SANTOS
  • CARLOS ALBERTO MARTINEZ HUITLE
  • ALINE MARIA SALES SOLANO
  • DANYELLE MEDEIROS DE ARAUJO
  • Data: 14-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The problems of access to water, energy and food tend to worsen in the coming decades as a result of the increase in the world population, which is expected to reach 9.7 billion people in 2050. The solutions to these problems are the treatment of contaminated water and the use of renewable energy sources. However, a high number of synthetic organic compounds, such as industrial chemicals, pesticides, dyes and pharmaceuticals are released daily into many wastewaters and enter the aquatic environment in different ways, including the direct disposal of industrial effluents and wastewater or from wastewater treatment plants that do not meet their obligations. Electrochemical Advanced Oxidation Processes (EAOPs Electrochemical Advanced Oxidation Processes) have some advantages over AOPs. The addition of chemical reagents is not necessary, as •OH is directly generated by the oxidation of water and contaminants that do not react with the hydroxyl radical can be degraded by EAOPs via direct electron transfer reactions. In addition, the acid boundary layer, which is produced on the surface of the anode due to water oxidation, protonates the HC to H2CO3 and thus prevents the scavenging of hydroxyl radicals associated with HC present in natural waters. From an economic point of view, it is necessary to plan electrolytic devices that make the electrochemical oxidation of organic pollutants coupled with the cathodic hydrogen production a productive and viable process.

3
  • SAMUEL BRITO FERREIRA SANTOS
  • PHOTOCATALYTIC POTENTIAL OF THE NANOSTRUCTURE OF CoFe2O4:TiO2 FOR DEGRADATION OF ORGANIC POLLUTANTS
  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • OSVALDO CHIAVONE FILHO
  • ANDRE LUIS NOVAIS MOTA
  • EDSON LUIZ FOLETTO
  • Data: 17-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The concern with water resources contamination as result of petrochemical residues, or from the oil spill, has contributed in the search for systems to treat those effluents, capable of reducing the load of these pollutants to acceptable levels for correct disposal. In the present study, CoFe2O4 magnetic nanoparticles and CoFe2O4:TiO2 (30:70) nanostructures were synthesized via solvothermal route. Those materials were characterized by XRD, FTIR, size distribution, and textural analysis (BET). The application of the nanostructures for the organic contaminant (Erionyl Red A-3G) degradation process were evaluated by adsorption kinetics and isotherms. The photocatalytic tests evaluated the initial pH (2, 3, and 4) and the catalyst concentration (0.1, 0.55, and 1.0 g/L) influence by an experimental design 2² + 3 central points. The diffractograms identified the MNPs (CoFe2O4) monophasic synthesis and the nanostructures with anatase as the main phase and CoFe2O4 as the second phase. The spectra confirmed the spinel formation and the metal-oxygen bond from TiO2. The particle size distribution revealed the MNPs nanometric scale and the dimension of the nanostructures prepared with TiO2. Cobalt ferrite showed absorption in the entire UV-Vis spectrum, TiO2 exhibited absorption only in the UV region, and the heterojunctions (CoFe2O4:TiO2) showed the contribution of ferrite in increasing the absorption in the visible region. The materials presented optical band gaps of 1,38 eV (CoFe2O4), 3,15 eV (TiO2), 2,75 eV (70Ti), and 1,76 eV (50Ti). The textural analysis indicated the formation of a mesoporous nanostructure, with a surface area of 6.34 m²/g and pore volume of 0.04 cm³/g. The adsorption tests reached equilibrium in 15 min (10 and 20 ppm) and in 18 min (100 ppm), with an isotherm described by the Freundlich model (R² = 0.999). The photocatalytic tests showed significant effects of initial pH and catalyst concentration on the Erionyl Red A-3G degradation, with an optimal condition at pH 2 and 1.0 g/L of catalyst, reaching 100% degradation within 60 min. The CoFe2O4:TiO2 nanostructures showed potential for organic contaminants degradation, with magnetic characteristics and the possibility for future tests on petroleum industry effluents treatment.

4
  • MÁRCIA FERNANDA TEIXEIRA DE MENEZES
  • FRACTIONARY CRYSTALIZATION STRATEGY APPLIED TO THE NACL-CACL2-H2O SYSTEM

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • FRANCISCO WENDELL BEZERRA LOPES
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • Data: 19-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The Brazilian semi-arid region, in certain periods, suffers from water scarcity. In addition to insufficient rainfall, another factor that contributes to this scenario is the presence of shallow crystalline soils, which impair water storage in underground aquifers. However, even if stored in high amounts in aquifers, due to the high amount of salts, the water becomes unfit for human consumption. According to Ordinance 2,914/2011 of the Ministry of Health, in the long term, water with a high amount of ions in solution may lead to health complications for individuals who consume it. To solve this problem, the use of desalination techniques is recommended. The present study was carried out based on physical-chemical data from well water in the community of Boa-Fé in Mossoró/RN, based on data collected by Antas (2017), and a strategy for recovering salts and obtaining drinking water. A fractional crystallization study was then carried out based on solid-liquid equilibrium diagrams, applied to the NaCl-CaCl2-H2O system at different operating temperatures (50 °C and 75 °C). The first stage of the project was based on the study of the system at 75 °C, from which it was possible to define crystallization routes (Strategy A1, B2, C3, and D4). In this condition, the route that showed the best performance in removing the salts was Strategy B2, which showed extraction of 83.85% of NaCl and 72.16% of CaCl2.2H2O. Even though the percentages were high, they were not enough to bring the system to the value established for the potability standard. It was, therefore, necessary to start the second stage of the study, in which optimization strategies were defined that would lead to greater recovery of these salts: cooling the process to a temperature of 50 °C (Optimization 1); dilution of the output current to the system at 75 °C (Optimization 2); the dilution of the output current for the system cooled from 75 °C to 50 °C (Optimization 3). Strategy B2 plus Optimization 2 proved to be sufficient to obtain water within potability standards. This strategy resulted in a recovery of 95.48% of NaCl and 92.20% of CaCl2.2H2O. However, among all of them, the one with the best recovery rates was Strategy B2 plus Optimization 3, which extracted 97.09% of NaCl and 94.82% of CaCl2.2H2O. In a third moment, the simulation of the fractional crystallization process was carried out in the SPECS v5.63© program, to compare the methodologies and validate the strategy established through the equilibrium diagrams. However, the thermodynamic model extended UNIQUAC and the equation of state SRK, used by the program, are not suitable to describe an electrolytic system. For this reason, the comparative study carried out revealed a significant difference between the methods, of approximately 11.15%. In conclusion, it was found that the study proved to be effective in proposing strategies for recovering salts and obtaining water within potability standards.

5
  • JEFFERSON DAVID COUTINHO DE ARAÚJO
  • STEAM-PHASE SURFACTANT INJECTION APPLICATION TO INCREASE THE RECOVERY FACTOR OF HEAVY OIL FIELDS IN THE POTIGUAR BASIN.

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • ANTHONY ANDREY RAMALHO DINIZ
  • MARCOS ALLYSON FELIPE RODRIGUES
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 22-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Petroleum corresponds to the main global energy matrix, so it is necessary to maintain production at levels capable of meeting the demand, which is estimated at 30% more by the year 2040 compared to 2010. Therefore, increasing the oil recovery factor of a reservoir is an essential goal in the oil sector and, in this sense, alternative and complementary methodologies have been developed to allow the extraction of reservoirs that are no longer considered economically viable, mature fields. The revitalization of these fields represents the extension of production life, besides offering significant opportunities for the expansion of world reserves. Thus, this work aims to apply two methods of advanced recovery simultaneously: thermal and chemical methods, in particular the injection of steam and surfactant, i.e., the injection of surfactant into the steam phase for the recovery of heavy oil from the Potiguar Basin. Furthermore, an analysis will be proposed regarding the injection banks of the surfactant and steam, in their different arrangements, through flow experiments in porous media. The technical and economic feasibility of the method can boost the revitalization of marginal fields, to ensure the extension of production and make these fields attractive again, stimulating local and regional development.

6
  • VITOR FERNANDES DIAS LOPES
  • POTENTIAL OF FUEL PRODUCTION BY FAST PYROLYSIS OF HIGH-VOLTAGE ELETRIC CABLES WASTES

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • FLÁVIA DE MEDEIROS AQUINO
  • RENATA MARTINS BRAGA
  • RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS
  • Data: 02-mar-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • A challenge upon nowaday’s society is the reuse of electric wire and cable, which most of the efforts are directed in the recovery of the metal, while the polymeric fraction is incinerated. This method is, however, causing environmental issues, therefore, being necessary research for alternative ways of recycling. Cross-linked polyethylene (XLPE) is used as an insulator in high voltage electrical cables and wires and recycling it requires bigger efforts, once its thermoset nature precludes the utilization of traditional process. The present work aims to evaluate the efficiency of fast and catalytic pyrolysis as an alternative for XLPE conversion into fuel material with high energy density and economic value. Thereunto, it will be done characterization of XLPE, in order to determine its energetical potential by thermogravimetric analysis (TG), volatile content, ashes content, X-ray fluorescence (XRF) and calorific value. Kaolin was used as catalyst and characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis, with the goal to study its application as a low-cost catalyst in the pyrolysis process. XLPE pyrolysis analysis were developed in a HP-R 5200 CDS Analytical micropyrolyzer linked to a  gas chromatographer  with mass spectrometer detector (GC-MS). XLPE characterizations assessed that this is a low ash (1,0%) and volatile (98,70%) content polymer, being, therefore, a good material capable of generating liquid products by pyrolysis. This process is important to raise energy density of this material, which was quantified in 44,58 MJ/kg, by converting its molecules into the ones contained in the most popular fuels for commercial use. The use of kaolin as a catalyst led to a decrease in the relative concentration of hydrocarbons in the range of diesel (C8-C24) from about 87% to 28%, and lubricating oils (C14-C50) from about 70% to 13%, in detriment of an increase in lighter hydrocarbons in the gasoline range (C8-C12) from around 28% to 87%. . Lastly, this process showed a great potential to transform  the studied material into commercial use fuel and can be considered as a sustainable alternative for the management and reuse of this plastic waste.  

7
  • VITÓRIA CIBELY SILVEIRA PENHA
  • Solubility of calcium carbonate in aqueous mixtures containing NaCl, CO2 and monoethylene glycol
  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • OSVALDO CHIAVONE FILHO
  • RAFAEL BARBOSA RIOS
  • Data: 31-mar-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The presence of monoethylene glycol (MEG) can cause  precipitation of salts present in the produced water, generating undesirable incrustations in the pipes and devices of the operations of petroleum and natural gas processing. The most common salt incrustations is calcium carbonate (CaCO3), due to its low solubility in water, and abundance of carbon dioxide (CO2) in the reservoirs . Sodium chloride (NaCl) is also widely found in incrustations, and directly influences the solubility of calcium carbonate. This work aims to study the behavior of calcium carbonate solubility in aqueous solutions containing sodium chloride, monoethylene glycol, and carbon dioxide. For this, a study was carried out to define an approach for calculating the solubility of calcium carbonate in water, which was compared to literature data. Then, data analysis was performed from the H2O+CaCO3+CO2 system at 278.15 K, 283.15 K, and 298.15 K, and the H2O+CaCO3+CO2+MEG system at 298.15 K, both varying the pressure of CO2, and the concentration of monoethylene glycol. These solubility measurementswere obtained by the analytical method using equilibrium cells. Experiments were also performed to determine solubility data in the modified Othmer ebulliometer for the H2O+NaCl, H2O+CO2, and H2O+CaCO3+CO2 systems. For the first system, tests were carried out at different pressures and concentrations until salt saturation. For the second system, the test was performed at a pressure close to atmospheric with a constant partial pressure of CO2. Finally, for the third system, the test was also performed at a pressure close to atmospheric, in the condition of carbonate saturation and with a constant partial pressure of CO2. The defined modeling demonstrated agreement with literature data, requiring the application of a mean ionic activity coefficient for a better description. Regarding the solubility data obtained in the glass equilibrium cells, they agree with the literature and with the expected behavior for the systems studied. The equilibrium measurements of the H2O+NaCl system showed agreement with the literature up to the salt saturation. In addition, it was possible to identify that the temperature values collected from the liquid best represented the phase equilibria. Finally, the equilibrium data of the H2O+CO2 and H2O+CaCO3+CO2 systems showed that CO2 dissolves better in the vapor phase, due to the condensate having a lower temperature compared to the boiler. For the system in the saturation condition of CaCO3, solubilities of 58.60 ppm and 71.50 ppm were obtained, respectively for ebulliometers 1 and 2 for the test without carbonated water, and an average solubility of 55.55 ppm for the tests with carbonated water, showing coherence, as they are in the same order of magnitude of values in the literature. The equilibrium data determined in this work aims to improve the processes present in oil and gas production, allowing the parametrization of models that will be useful to simulate the operations of interest in conditions in which experimental data is not available.

8
  • ALAN DE OLIVEIRA CAMPOS
  • Production of cellulolytic enzymes by Trichoderma reesei CCT-2768 through solid-state fermentation using green coconut (Cocos nucifera) fiber pretreated by the steam explosion as substrate.

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 22-abr-2022


  • Resumen Espectáculo
  • The residue generated by the green coconut production chain has caused a series of environmental and public health problems as it is a bulky organic material with slow decomposition. An alternative for its use would be in the application in production processes of lignocellulolytic enzymes via semi-solid fermentation (FSS), but a pre-treatment step is necessary to reduce the lignocellulose recalcitrance and the lignin and hemicellulose content in the material, because of that these compounds limit the accessibility of microorganisms. Studies indicate that, for a better induction of cellulase production by FSS processes, pre-treatment or their combination more efficiently exposes cellulose to filamentous fungi. In addition, the use of a suitable solvent during enzyme extraction after FSS also has a strong impact on the performance of cellulase production. Therefore, this study aimed to evaluate the production of cellulases using coconut fiber pretreated by steam explosion combined with alkaline pre-treatment (PV+A) by FSS using filamentous fungus Trichoderma reesei CCT-2768, evaluating the culture conditions (water activity and amount of substrate) through central rotational composite design (CCR), with Carboxymethylcellulase (CMCase) and Filter Paper enzyme activity (FPase) as responses. The combination of pre-treatments was more favorable for the removal of hemicellulose from green coconut fiber, reducing the content of this polymer from 10.15%, about the untreated biomass, to 5.38%, while the content of lignin increased from 21.32% to 34.82%, which may be associated with the lignin rearrangement effect during the biomass cooling process in the pre-treatment. Regarding the SSF of the pre-treated PV+A coconut fiber, it was observed that the solids load significantly influenced the behavior of CMCase in the cultivation, and water activity was shown to be a significant factor in both analyzed enzymes. It could be noticed that greater production of cellulolytic enzymes occurred in the semi-solid culture conditions in which the water activity is 0.995 and 5.25 g of substrate, obtaining an enzymatic activity of CMCases close to 3.0 IU/g, and for FPases, a value of 0.31 IU/g. When the best solvent for cellulase extraction was evaluated, the saline solution of 154 mM NaCl was more efficient in the recovery of the enzymes, producing an extract with the activity of 5.19 IU/g for endoglucanase and 1.19 IU/g for the FPase. Therefore, the best conditions of water activity and solids loading for the production of cellulases were identified, when using the fungus Trichoderma reesei CCT-2768 and coconut fiber pretreated by a steam explosion followed by alkaline pre-treatment, achieving good values of CMCase and FPase activities are found.

9
  • JOSÉ DEMÉTRIO NERY CAVALCANTE
  • USE OF DEEP EUTETIC SOLVENTS BASED ON ETHYLENE GLYCOL AND PHOSPHONIUM SALT IN THE SYNTHESIS OF BIODIESEL

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • OSVALDO CHIAVONE FILHO
  • Data: 09-may-2022


  • Resumen Espectáculo
  • Environmental issues have gained a strong role in recent decades, mainly due to the high pollution rates generated by the exacerbated consumption of natural resources. Thus, the need arises to adapt the means of production and the consumption of goods. From the point of view of fuels, the production of biodiesel appears as a method of replacing non-renewable fuels, as a way of reducing the impact of the environment. As a way to transform biodiesel synthesis greener, the use of Deep Eutectic Solvents (DES) as a solvent and catalysts for the reactions turn out to be interesting. This is due to its biodegradability and absence of toxicity, compared to conventional means of production, in addition to DES ability to simplify the product purification process. This study aims to analyze the synthesis of biofuels through the use of DES, as well as the main factors that influence the reaction process. In addition, analyses of the physical-chemical characteristics of the biodiesel are provided.

10
  • BEATRIZ DE AZEVEDO
  • Production of celulases ande xylanases by a new fungal species – A. lippiae URM 7547 – using a green coconut fiver pre-treated by steam explosion. 

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • MARCELINO GEVILBERGUE VIANA
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 20-may-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Endophytes, which can be bacteria, fungi or protozoa, are poorly studied. It is estimated that there are more than 250,000 different species of plants and one million endophytes in the world, which characterizes an average of four species associated with a plant species. Because they are inside the plant, these microorganisms can be a rich source of biomolecules of industrial interest, such as the production of hemicellulolytic enzymes. In this context, this study has the general objective of studying the ability of the endophytic fungal species, Achaetomium lippiae URM 7547, little mentioned in the literature, to produce cellulases and xylanases by means of a submerged cultivation using the fiber of the pre-green coconut husk as a substrate. - Treated by steam explosion. Initially, the potential of A. lippiae URM 7547 to produce hydrolases (amylase, lipase, protease, cellulase, xylanase and pectinase) in solid culture medium (72h at 30°C) with substrates in each specific enzyme was evaluated. configure it as an enzyme producer. For comparison of results, growth of CCT 2768 under the same induction conditions was used. A. lippiae URM 7547 presented itself as a potential producer of amylases, proteases and cellulases, with an enzymatic index greater than 1.5 (IE > 1.5) as well as T. reesei CCT 2768. It was also quantified, the yield of substrate conversion into cell biomass (Yx/s) of A. lippiae URM 7547 and its maximum growth rate (µmax) in liquid medium containing glucose and xylose and three concentrations of substrates and nutrient media with carbon sources and nitrogen in order to verify if the fungus is adept to submerged crops and what is the best condition for its growth. The best results for the liquid medium containing glucose were in 96h of culture in medium 3, containing peptone and yeast extract, with Yx/s equal to 0.062 ± 0.04 g.g-1, 0.072 ± 0.04 g.g-1, and 0.076 ± 0.03 g.g-1, for concentrations of 5, 10 and 20 g.L-1 of substrate, respectively. For the medium containing Xylose, the best result was during 144h of cultivation with Yx/s values equal to 0.52 ± 0.08, 0.59 ± 0.09 and 0.65 ± 0.03 g.g-1 for 5, 0, 10.0 and 20.0 g.L-1, respectively, also in medium 3. Finally, the submerged fermentation was started to produce cellulases and xylanases. The lignocellulosic characterization of green coconut fiber in natura and post pre-treatment by steam explosion carried out with the purpose of verifying the performance of the pre-treatment was the penultimate step of the dissertation. After pre-treatment, there was a 14% decrease in extractables in relation to in natura fiber, since it is easily removed by solvents; an 8% increase in cellulose and a 6% decrease in hemicellulose; lignin remained statistically the same (p>0.05). In FSm, the Q Assay with condition of 33°C, 109 spores.mL-1, and 30.0 g.L-1 of substrate, was the one that presented the best yield in relation to the four quantified enzymes, with enzymatic activities (U.mL-1) of 0.41 ± 0.06, 5.94 ± 0.31 and 0.08 ± 0.035 and 9.12 ± 0.28 for FPase, CMCase, Cellobiase and Xylanase, respectively. Finally, A. lippiae URM 7547 was a good producer of cellulases and xylanases, in addition to other hydrolytic enzymes such as amylases and proteases, with an excellent growth performance in submerged media.

11
  • JOAO AFONSO NEO DE ANDRADE LIMA
  • DEVELOPMENT OF LIGHTWEIGHT SLURRIES USING HOLLOW CERAMIC MICROSPHERES FOR APPLICATION IN CEMENTATION OF OIL WELLS

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • CRISTIANE RICHARD DE MIRANDA
  • JÚLIO CÉZAR DE OLIVEIRA FREITAS
  • RENATA MARTINS BRAGA
  • RODRIGO CESAR SANTIAGO
  • Data: 23-may-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Geopressures are related to the main problems caused during the drilling of wells, and any damage caused to the formations may compromise the safety and economy of the well. Therefore, alternative solutions are needed to control the pressures exerted during the displacement of cement slurry, such as changing its density, commonly called the slurry's weight. One way to reduce the density of the slurries is to use microspheres in their composition. Among these, the hollow ceramic microsphere, as a by-product of the burning of mineral coal, has a lower cost and is environmentally sustainable. Given the above, the objective of this work was to develop cement slurries with low specific weight, using hollow ceramic microspheres (fly ash), for application in primary cementing operations of oil wells. The slurries were formulated at densities from 11.5 lb/gal to 12.5 lb/gal. The best formulations were then used to develop slurry systems for application in wellbores with low fracture gradient zones. The technological characterization tests were carried out following the procedures established by API RP 10B/SPEC 10A and PROCELAB, 2005, among which the compressive strength and stability tests stand out. The results showed that it is possible to partially replace Portland cement with industrial waste, making its application sustainable, low cost, and with satisfactory mechanical properties for application in oil wells, with compressive strength between 3.0 and 13.5 Mpa.

12
  • JÉSSICA ALVES BRASIL
  • DIAGNOSIS OF OPERATING CONDITIONS OF THE ELECTRICAL SUBMERSIBLE PUMP USING MACHINE LEARNING

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANTHONY ANDREY RAMALHO DINIZ
  • CARLA WILZA SOUZA DE PAULA MAITELLI
  • EDNEY RAFAEL VIANA PINHEIRO GALVAO
  • OSVALDO CHIAVONE FILHO
  • Data: 30-may-2022


  • Resumen Espectáculo
  • In artificial lift, Automation techniques are also used in order to increase the efficiency and production of oil wells. In the Electrical Submersible Pump (ESP) lift method, the use of Automation tools becomes essential in the interpretation of data available in the field, since the analysis of these data is not always sufficient to analyze, interpret, monitor and diagnose the performance. and well integrity, in addition to ESP operation and real-time efficiency. However, even though these wells operate with automated systems, some production damages can be identified decreasing the efficiency of the ESP pump and even having significant production losses. Initial diagnosis of the ESP system can lead to great cost savings and less maintenance due to technologies implemented in production fields. In oil fields, to identify the operating conditions of a ESP well, amperimetric charts are used, which are current versus time graphs. The analysis of these charts is usually performed by operators who have a large number of wells to examine, and this overload often decreases the efficiency in the process of reading the operating conditions of the ESP pump. Currently, real-time technologies based on Machine Learning algorithms (ML) have challenged and encouraged companies to create solutions for early diagnosis of abnormalities in well operation. Thus, this work aims to provide a proposal for detecting the operating conditions (normal operation, normal operation with gas, gas interference and gas blockage) of the ESP pump from the analysis of electrical current data obtained from 24 wells from Mossoró, RN, Brazil. Machine Learning classification algorithms were implemented in the Python programming language in the Google Collaboratory environment. The classification algorithms used were Decision Tree (DT), Support Vector Machine (SVM), K-Nearest Neighbor (KNN) and Multi-Layer Perceptron Neural Network (MLP). As the data sets had points ranging from 159 to 344, a standardization was performed with an interpolation technique so that all data sets had 344 points, the maximum number of points collected. The algorithms were tested without and with hyperparameter tuning, in which the hyperparameter set was specific for each ML technique. In addition, balancing tests (oversampling) of the training datasets were performed to identify the difference in relation to the unbalanced dataset. The results obtained and presented throughout the work confirm that the application of the ML algorithm is viable for the classification of the operating conditions presented, since all of them had an accuracy greater than 87%, with the best result being the application of the SVM model, which reached an accuracy of 93%.

13
  • BÁRBARA DA SILVA ROCHA
  • Thermodynamic study of the gas-solid reduction of niobium oxides.

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • MARIA JOSE SANTOS LIMA
  • UILAME UMBELINO GOMES
  • Data: 20-jun-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Most of niobium deposits worldwide are found in Brazil. This metal’s excellent physical and mechanical properties make it attractive to the industry. Niobium is commonly obtained through carbothermic and metalothermic reduction methods. The present work aimed to study the thermodynamics behind niobium oxides reduction by gaseous reducing agents, such as methane and carbon monoxide. The equilibrium constants of the representative independent reactions of each system were calculated and the temperatures at which the reactions are more feasible were selected. Equilibrium composition was calculated by the Gibbs energy minimization method in Microsoft Excel spreadsheets using the Solver supplement. Starting with NbO as the solid reactant, the reduction was investigated in different gas phase compositions (purê gas, 67.5%, 12.5% and 2.5% of a reductant/H2 mixture) and number of moles of the solid (0.5, 1. 1.2 and 2 mols). The optimum conditions found were then applied to Nb2O5 and NbO2. Results showed that CO is not a feasible choice for niobium oxide reductions. Reaction between NbO and CH4 tends to carbide formation but at lower methane compositions and higher temperatures it’s possible to obtain metallic niobium. Complete conversion of NbO in Nb is obtained at 2150 K under 2.5% CH4/H2 and 1.2 moles of NbO. In the same conditions NbO2 was completely cnverted in NbO at 2100 K. Nb2O5 is reduced to NbO2 under any conditions even at temperatures as low as 1100 K but the presence of H2 avoids methane decomposition. Thus, this work concludes that – from a thermodynamical point of view – CH4 is a promising reducing agent for niobium oxides.

14
  • JÚLIA CAROLINE RIBEIRO DE CARVALHO
  • Recovery and purification of invertases from Saccharomyces cerevisiae in microchannels using PEG 1500/magnesium sulfate aqueous two-phase system

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • Data: 15-jul-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The search for process intensifying methods is one of the targets of chemical engineering, including in classical processes such as liquid-liquid extraction. The separation of biomolecules uses this type of extraction and the search for intensification has gained prominence in the literature. However, studies on the evaluation of the impact of flow patterns on extraction performance are still scarce, especially in complex environments with multiple target molecules such as the products of cell lysis. Thus, in this work, invertase from Saccharomyces cerevisiae was separated using the liquid-liquid extraction technique in a microsystem through a aqueous two-phase system (ATPS) formed by polyethylene glycol (PEG) 1500 (15% w/w), magnesium sulfate ( 20% w/w) and distilled water (65% w/w). The study was carried out using different operating conditions, including variations in total flow from 9.30 μL/min to 324.45 μL/min, volumetric ratio between top and bottom phases from 1:2 to 2:1, diameter of 0.51 to 2.06 mm and tube lengths from 0.58 to 9.40 m. The arrangement of the phases was observed during the course in the microsystem using a wide range of total flow and a flow pattern map was obtained. The patterns observed were short-slug, slug and parallel, with the short-slug pattern for low flows and parallel for high flows. It was found that increasing the total flow negatively affected the recovery of invertase during extraction, while higher values of residence time and volumetric ratio improved the recovery and the enzyme purification factor. Using 35 min residence time, 2:1 volumetric ratio and 1.14 mm tube diameter, the short-slug and slug patterns showed the best process performances. These results reached, numerically, the values of 53.95% and 51.15% of invertase recovery and purification factor of 1.84 and 2.78, respectively. The effect of the channel diameter was also studied and it was concluded that in smaller diameters, the recovery obtained better results, highlighting the value of 57.01% of invertase recovery and a purification factor of 4.16 in the 0. 51 mm diameter when the residence time was 35 min and the volumetric ratio was 2:1. The best result can also be justified by the value of the maximum volumetric mass transfer coefficient (kLa) obtained of 8.86 x 10-4s-1 when compared with the resulting values for the other operating conditions. Thus, the present study contributes to the development of knowledge in the area of microsystems in problems of enzyme separation through liquid-liquid extraction.

15
  • EMANUELLE MARIA DE OLIVEIRA PAIVA
  • STUDY OF CASEIN AS A FOAMING AGENT IN THE DRYING OF TOMATOES BY THE FOAM-MAT METHOD

  • Líder : MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • MARCELLO MAIA DE ALMEIDA
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • THAYSE NAIANNE PIRES DANTAS
  • Data: 27-jul-2022


  • Resumen Espectáculo
  • The constant technological innovations in the food industry require industries to search for increasingly healthier products with high added value. In this scenario, fruit powders have great potential for application in healthy products, because they have nutrients and vitamins essential to  the functioning of the immune system. Fruit powders are obtained by  several drying methods, and one of them is the foam layer method, in  which the material is submitted to air incorporation to form a foam. In the  preparation of the foam it is common to use additives such as foaming  agents and emulsifiers, which aid in both the formation and stability of the  foam. The foaming agent studied in this work is casein, a natural protein obtained from the coagulation of skim milk, which adds nutritional value  to the final product obtained. In this work the process to obtain casein will  be the coagulation through the addition of microbial rennin (an enzyme),  which forms casein and whey, and the subsequent separation of the two  components. After beating the casein is transformed into foam and then incorporated into the tomato pulp. The experiments will be conducted  based on a factorial experimental design of the 2³ type. The foams will be  formed from raw tomato pulp and cooked tomato (without cooking and  with 10 and 20 minutes of cooking), and different proportions of pulp (50,  60 and 70%) and submitted to drying in an air chamber with controlled  temperature (60, 70 and 80ºC) until reaching a constant weight. Semi empirical and phenomenological mathematical models will be fitted to the  drying kinetics data of the foams. The powders obtained will be  submitted to analysis for humidity, water activity and hygroscopicity.  Considering as response variables the physical-chemical characteristics of  the powders and the drying time, from the statistical analysis of the  results the best experimental condition will be defined. In the optimal experimental condition, experiments will be performed to produce  powder in sufficient quantity for solubility, microbiological and centesimal  composition analyses. In order to verify a subsequent industrial application, a sensory analysis of products such as cheese creams and pâtés flavored with tomato powder will be performed. 

16
  • MEYRELLE FIGUEIREDO LIMA
  • EVALUATION OF THE STABILITY AND ANTIOXIDANT ACTIVITY OF COSMETIC EMULSIONS CONTAINING COPAÍBA OIL (COPAIFERA OFFICINALIS L)

  • Líder : ALCIDES DE OLIVEIRA WANDERLEY NETO
  • MIEMBROS DE LA BANCA :
  • ALAINE MARIA DOS SANTOS SILVA
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • CLAUDIO LOPES DE VASCONCELOS
  • DENNYS CORREIA DA SILVA
  • JOSE LUIS CARDOZO FONSECA
  • Data: 28-jul-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Plants began to be used for therapeutic purposes from the beginning of human history and it was in the search for food for their survival that many toxic or healing properties of various plants were discovered. Many plants of the Brazilian flora have been used to treat diseases and natural products are becoming increasingly important and becoming an alternative to synthetic remedies. Copaiba oil-resin is a natural antibiotic with great potential for effectiveness against gram-positive bacteria, being widely used as a healing and anti-inflammatory in the treatment of infections. The study will be carried out by developing emulsions using copaiba oil resin, Tween 20 and distilled water, through an experimental design called Scheffé Network to evaluate which formulation has the best performance. The emulsion with the best performance will be submitted to rheological tests, pH tests, stability tests and evaluation of the synergistic effect of the antioxidant activity. The project will be carried out at the Laboratory of Technology of Surfactants and Separation Processes (LTT-IQ) in partnership with the Laboratory of Biotechnology of Natural Polymers (BIOPOL-CB), the collaboration enables the performance of the proposed analyses.

17
  • GIOVANNY SILVA DE OLIVEIRA
  • Glycerin usage in Chemical Looping Combustion –  Experimental and Simulation

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • FELIPE PEDRO DA COSTA GOMES
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 31-ago-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  •  Greenhouse gases emissions and their consequences are one of the main environmental problems faced today. To mitigate the impacts caused by this phenomenon, Brazil seeks to reduce CO2 emissions by 43% by 2030 in order to meet the Paris Agreement. To achieve this goal, it is possible to use techniques based on the principle of Carbon Capture and Storage, such as Chemical Looping Combustion (CLC). These processes are versatile in terms of the use of fuels in the three states of matter. As the growing depreciation of glycerin in recent years, there is a need to relocate this by-product to other applications that could increase its market value, since this waste product represents about 10% of the amount of biodiesel generated. Thus, this study aims to evaluate the feasibility of glycerin on Chemical Looping Combustion and provide its process simulation. The crude glycerin solution was synthesized considering water, methanol and ethanol as the main contaminants. The experiments were carried in two sets: the first to determine the best values to oxygen-to-fuel molar ratio (ϕ), H2O/Glycerin molar ratio and Fuel Reactor Temperature (TFR) and afterwards another set of experiments was done for the contaminants (methanol and ethanol) using the best operational conditions determined by the previous set. A simulation of the CLC process was developed in the Aspen Plus® environment, verified with methane and ethanol experimental data and adjusted for glycerin. For the first set, the results revealed that the optimized conditions for the diluted glycerin in CLC was achieved at ϕ = 7, H2O/Glycerin = 0,75 e TRR = 750°C. The impurities analyses show that methanol brings disadvantages to the combustion process, while ethanol improves the combustion efficiency. The process simulation was capable to reproduce the experimental data found for glycerin with acceptable deviations. 

18
  • IAN MACEDO SILVA
  • Hydrogen sulfide removal in the treatment of biogas

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • ANDRE EZEQUIEL GOMES DO NASCIMENTO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MARCIONILA DE OLIVEIRA FERREIRA
  • OSVALDO CHIAVONE FILHO
  • Data: 15-sep-2022


  • Resumen Espectáculo
  • Biogas has a huge potential for applications, which can be of the most varied. The high content of methane in its composition makes it an extremely interesting gas for use as a source of thermal energy. However, the presence of hydrogen sulphide poses a problem for the use of biogas. Taking into account the rural context in Brazil, the benefits that can be obtained by the application of technologies based on biogas can be immense, but first of all, it is necessary to be concerned with safety in the use of this mixture of gases, then methods for removal of hydrogen sulphide become of great interest, mainly methods that are accessible, given the difficulty of access to products and equipment to carry out the removal process. Industrially, there are already some well-known and widespread methods for the removal of hydrogen sulfide, highlighting chemical absorption, through the use of amines in the process, which can then be recovered, but bringing to the context of the brazilian semi-arid, industrial methods, despite being effective, require a large amount of resources in this context. Using a sodium hydroxide solution as a solvent in the hydrogen sulfide absorption process presents itself as an alternative that can have a good application potential, both in terms of cost and in terms of reagent accessibility, thus determining better operating conditions, using experimental planning techniques to carry out the experiments, is very important in the application and diffusion of this type of technology.

19
  • EDYJANCLEIDE RODRIGUES DA SILVA
  • Diesel B10/butanol/ethanol/methanol formulations: phase equilibrium and tests in a diesel engine

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • PAULA FABIANE PINHEIRO DO NASCIMENTO
  • RICARDO PAULO FONSECA MELO
  • Data: 29-oct-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Among the main sources of energy used in Brazil, diesel oil stands out due to its wide use in road transport, locomotives, and ships. Despite its relevance to the transport sector at the national level, its contribution to the climate imbalances currently observed in the world is undeniable. In this perspective, although it is challenging to reconcile the supply of global energy needs with the preservation of the environment, the ability to reduce undesirable emissions makes diesel/alcohol blends an attractive option. Based on this premise, the present study has the general objective of developing B10/butanol/methanol (DBM) and B10/butanol/ethanol (DBE) diesel blends for use in real engines. The compositions of the formulations were determined based on the construction of equilibrium diagrams at a temperature of 25 ± 2°C. Othmer-Tobias and Hand correlations were applied to the phase equilibrium data obtained, which attested to their thermodynamic consistency. Then, the adequacy of the NRTL and UNIQUAC models in the adjustment of the experimental data was evaluated with the aid of the TML computational tool, the latter being the one that generated the lowest root of average square deviation (0.34%). The prepared mixtures were submitted to density tests (ASTM D4052 at 20, 25, and 40°C), kinematic and dynamic viscosities (ASTM D7042 40°C), corrosivity (ASTM D130 at 50°C for 3h), pour point (ASTM D97), cloud point (ASTM D2500), cold filter plugging point (ASTM D6371) and vapor pressure (ASTM D6378), as well as employed in the construction of power curves in a diesel cycle engine according to the recommendations of the test code of engines (ABNT - NBR ISO 1585). In general, all the compositions studied have characteristics that meet the ANP specifications for road use, although DBM2 has presented unsatisfactory hourly and specific consumption during combustion in a diesel engine.

20
  • JONATHAN NASPER BENTO DA SILVA
  • PRODUCTION OF BIODIESEL BY SUPERCRITICAL TRANSESTERIFICATION OF SESAME OIL IN A CONTINUOUS-FLOW REACTOR

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • ANDRE EZEQUIEL GOMES DO NASCIMENTO
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • Data: 04-nov-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In view of the environmental conditions in the world today, the demand for renewable energy sources has increased more and more due to the need to reduce the pollution generated to the environment when using fossil fuels. Biodiesel stands out as one of these new energy sources due to its great variety in the raw materials that can be used in its production and also because of its biodegradability. The sesame seed presents in its Composition a high oil content and its cultivation is favorable due to its ability to adapt to regions with a dry climate. Initially used in the food industry, the oleaginous seed shows potential as a natural source for biodiesel production, and this process has received substantial incentive through tax benefits on the purchase of biofuel from this plant. The transesterification reaction of sesame oil under supercritical conditions appears as an alternative to the most common method of biodiesel production, the catalytic transesterification, because there is no need to use a catalyst in the reaction, resulting in a simplification and possible savings in the process. This study used sesame oil and ethyl alcohol to produce biodiesel under supercritical conditions. The sesame oil physicochemical properties were determined, such as: density, acidity index, fatty acid content, viscosity and humidity. In the assays a continuous flow reactor of 15 mL volume was used, the system pressure was kept at 100 bar, varying the reaction temperature in the range 310-390 °C, with a residence time of 15-45 min and a molar ratio oil:ethanol of 1:30-1:50. From the results obtained in the variation of the operational parameters a statistical analysis was performed in order to verify the influence on the reaction yield. The best result obtained
    was 87.45 %, at a temperature of 390 °C, residence time of 45 min and molar ratio oil:ethanol of 1:40. The statistical analysis revealed a greater influence of temperature and residence time on the results.

21
  • RAFAELA ALVES VICENTE RODRIGUES DA SILVA
  • Coronavirus-19 and basic sanitation: relationships and impacts
  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • ANDREA OLIVEIRA NUNES
  • CARLSON PEREIRA DE SOUZA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • YARA FELICIANO GOMES
  • Data: 14-nov-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • This work proposes to establish the theoretical-scientific aspects that allow to perceive the effects of basic sanitation in the prevention and combat of pandemics caused by viruses, mainly, the current pandemic of COVID-19. Making connections between concepts and things, based on a broad bibliographic investigation that allows extracting important information on the thematic axis contained in the coronavirus-basic sanitation binomial. The research developed is of an exploratory type combined with a descriptive one, with a quali-quantitative approach. Classic materials, government platforms and scientific publications were consulted. COVID-19 reinforced the importance of access to basic sanitation for public health. However, it is difficult to guarantee hygiene actions when not everyone has access to treated water, sewage collection and treatment. Some of the factors that may be associated with the incidence of cases or mortality rates of this disease are sanitation conditions. The main route of transmission of the virus is via contaminated aerosols and respiratory droplets. However, the presence of the genetic material of SARS-COV-2 in the feces of infected people aroused interest in studies related to the possibility of oral-fecal transmission through untreated sewage, contaminated water supply and even the bioaerosols produced in ETEs. Due to the high number of infected people, there is an interest in analyzing other possible routes of transmission and how access to sanitation in Brazil influences the fight against the disease, since the persistence of the virus in the environment has not yet been completely clarified. The Brazilian population is estimated at more than 200 million inhabitants distributed throughout the five macro-regions with different demographic densities, sociocultural aspects and access to sanitation services. The North and Northeast macro-regions have the worst rates of water supply, sewage collection and treatment. Despite this, these regions had lower rates of cases and deaths from COVID-19. On the other hand, two of the best regions served by basic sanitation services, the Midwest and Southeast, had the highest accumulated deaths until June 2022. It can be seen that the lack of sanitation has been causing long-term deaths from waterborne diseases in the However, with investments in the sanitation sector, it is possible to reduce the number of hospitalizations and deaths, in addition to assisting in preventive measures to combat infectious diseases. It was also found that poor sanitation is not the only vector capable of influencing the spread of the disease. But it can be an aggravating factor, considering that 16% of the Brazilian population do not have access to the water supply network, and are those who adhere to dubious water sources, without confirmation that it is within the potability standard for human consumption, becoming more vulnerable to waterborne diseases. As for the monitoring of SARS-COV-2 in sewage, it can be a useful tool to monitor new outbreaks of COVID-19. So far, there is no scientific evidence that proves fecal-oral or fecal-respiratory transmission, however, it is pertinent to continue in-depth research on the persistence and viability of the virus in the environment, especially in aquatic matrices. As well as the fate of Sars-Cov-2 in treatment plants, analyzing the performance of virus removal in the stages.

Tesis
1
  • JOÃO MILLER DE MELO HENRIQUE
  • TREATMENT OF SOILS CONTAMINATED WITH HYDROCARBONS USING WASTE AND USE OF PERMEAVE REACTIVE BARRIERS
  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • ELISAMA VIEIRA DOS SANTOS
  • CARLOS ALBERTO MARTINEZ HUITLE
  • CARMEN MARIA FERNANDEZ MARCHANTE
  • MANUEL ANDRES RODRIGO RODRIGO
  • RICARDO ANDRÉS SALAZAR GONZÁLEZ
  • Data: 25-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo

  • Soil and groundwater pollution is a problem that affects developed and developing countries due to acceleratedindustrialization and urbanization in the last decades. In this context, the aim of the present thesis is to use combined technologies (soil washing in pre-pilot system on a laboratory scale and on a pre-pilot scale using a fixed bed column, investigating the use of anionic, cationic and nonionic surfactants. the use of reactive permeable barriers of cork in order to remove the organic compounds in the fixed bed column in laboratory scale and pre-pilot.However, another important parameter to be studied is the treatment of the effluent generated during the process of washing the soil, for this reason will be investigated the advanced electrochemical oxidative processes, in order to remove the organic compounds present.

2
  • MAYRA KEROLLY SALES MONTEIRO
  • DEVELOPMENT AND OTIMIZAÇÃO OF PROCESSES ASSISTED ELETROCHEMICALLY FOR A PRODUCTION OF CHLORINE DIOXIDE
  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • JUAN M. PERALTA-HERNÁNDEZ
  • CARLOS ALBERTO MARTINEZ HUITLE
  • CARMEN MARIA FERNANDEZ MARCHANTE
  • ELISAMA VIEIRA DOS SANTOS
  • MANUEL ANDRES RODRIGO RODRIGO
  • Data: 28-feb-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Chlorine dioxide is two of the most interesting oxidants because it combines a strong oxidation capacity with a low formation of dangerous by-products such as chlorinated organics during its application. Therefore, it is widely used in the disinfection of potável water and, at present, it is intended to be used in the disinfection of surfaces or buildings. It is generally produced by the chemical interaction of chlorite as hypochlorite / chlorine or hydrochloric acid, an interesting alternative for your production and a combination of strongly acidic chlorate and hydrogen peroxide. Both composts are made efficiently and efficiently manufactured with electrochemical technology, opening up the possibility of a complete electrochemical process for the production of this important oxidant. This thesis synthesizes recent advances in the eletrochemical production of raw materials, as a complete eletrochemical production of chlorine dioxide, not only paying attention to scientific literature, but, mainly, recent patents, trying to see at what level technology is prompt. são each one of the technologies and that are the elements of the value chain necessary for a complete implementation of the technology.

3
  • ADOLFO LOPES DE FIGUEREDO
  • Optimization study of the catalytic hydrogenation process of fumaric acid

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • PEDRO MIGUEL VIDINHA GOMES
  • TIAGO PINHEIRO BRAGA
  • FRANCISCO WENDELL BEZERRA LOPES
  • MARCO AURÉLIO SULLER GARCIA
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • Data: 25-mar-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The selective production of valuable products for chemical industry such as γ-butyrolactone (GBL), tetrahydrofuran (THF) and 1,4-butanediol (BDO) that results from the catalytic hydrogenation of fumaric acid (Ac.FUM) is a quite interesting subject in the field of biomass valorization. In fact, these products can be considered bioplatforms of molecular construction, functioning as a starting point for countless synthesis processes. From the point of view of green chemistry, water and CO2 are considered ideal solvents to drive this type of chemical transformation. Although achieving good conversion rates and selectivity in these reaction media the catalytic performance of this hydrogenation reaction can be a challenge, even when a suitable catalyst is employed. In this context, this process was studied and optimized, firstly through experimental design using a catalyst based palladium-rhenium on silica (Pd-Re/SiO2), and a second catalyst  based iridium-rhenium on silica (Ir -Re/SiO2), barely used in the literature, for selective hydrogenation of Ac.FUM in GBL is an aqueous medium. The catalysts were synthesized by sequential wet impregnation, and characterized by XRD, RTP, ICP, TEM and surface area analysis. Reaction products were identified by GC-FID and HPLC-RI. In a second moment, supercritical CO2 was used as a reaction medium to optimize the process, varying pressure between 105-300 bar under the temperature conditions of 60-250 ºC. Finally, solvent evaluation was studied in the reaction selectivity, where methanol was also used under conditions 60-250 ºC and 10-300 bar. The results of Ac.FUM hydrogenation using catalysts based on palladium-rhenium and iridium-rhenium showed that GBL was produced with 91 and 90% selectivity, respectively, under the optimized conditions of pressure and temperature predicted by the empirical model of 188 °C and 41 bar of H2 for Pd-Re/SiO2 and 210 °C and 25 bar of H2 for Ir-Re/SiO2. Thus, the experimental design allowed a high selectivity to be obtained in an aqueous medium, providing better rationalization of the combined effect of the temperature and pressure variables. Furthermore, statistical analysis in experimental design showed that temperature has a greater effect on GBL selectivity in relation to H2 pressure, being non-linear for both catalysts. In studies using supercritical CO2 it was possible to model the catalytic activity, suppressing the formation of by-products and obtaining 89 % and 64% selectivity for GBL using Pd-Re/SiO2 and Ir-Re/SiO2, respectively, under optimized operating conditions. The addition of methanol as solvent changed the composition of products, obtaining THF as the major product, with a maximum selectivity of 97 % under the conditions of 175 °C, 50 bar of H2 and 150 bar of total pressure for Pd-Re/SiO2, and 89 % under conditions of 175 °C, 50 bar H2 and 300 bar total pressure for Ir-Re/SiO2.

4
  • CALINE NUNES DE CARVALHO
  • Optimization of the manufacture process of a well logging tool for carbon footprint reduction

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ANDREA OLIVEIRA NUNES
  • PATRÍCIA CRISTINA DE ARAÚJO PUGLIA DE CARVALHO
  • PEDRO TUPÃ PANDAVA AUM
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 31-mar-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • One of the most severe issues of the current society is the global climate change caused by uncontrolled greenhouse gas (GHG) emissions. Determining the carbon footprint (CF) of any processes or products is an important step to identify activities with highest potential of GHG emissions. Industry processes represent almost 30% of the global GHG emissions. Despite the efforts to green the global economy, considerable attention must be focused to assess and characterize the environmental impact of products and processes from all different industry sectors. Heat treatment methods are often used to manufacture critical parts for petrochemical, aerospace, and automotive industries. The continuous hydrogen furnace is an equipment that provides the controlled atmosphere required for heat treatment, producing high integrity assemblies. This research presents a proposal to quantify the CF and to define a strategy to reduce it related to the application of hydrogen furnaces for brazing processes. Initially it was done a systematic and critical bibliometric analysis of CF reduction techniques implemented in different industry sectors along the last three decades by using the softwares StArt® and the VOSViewer®. In addition to guiding de methodology choose for this research, the framework and results of this systematic literature review can be used as a baseline for future empirical researches also providing innovative directions. The proposed method is based on modifying the furnace cooling system by replacing the current water supply for a closed loop. For that, two scenarios have been proposed using the UniSim® software: one connecting the water flow from the furnace to the facility chiller system, and another one keeping the same conditions as water closed loop but changing the chiller refrigerant from R-134a to ammonia. The data obtained as a result of the simulation were essential to estimate the energy needs of each scenario. Also considering furnace manufacturing manual and datasheet, the carbon footprints were determined using the software SimaPro®. The change on the furnace water supply for a closed loop allowed a significantly decrease of water consumption, eliminated the monthly disposal of 800,000 liters of that resource. The application of ammonia as the refrigerant generated 97% reduction of the overall carbon footprint, leading therefore to a climate change mitigation.

5
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • Multifunctional nickel nanoferrites: production, properties and applications
  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDARAIR GOMES DOS SANTOS
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • DANIEL ARAÚJO DE MACEDO
  • MARCO ANTONIO MORALES TORRES
  • RAFAEL ALEXANDRE RAIMUNDO
  • Data: 04-jul-2022


  • Resumen Espectáculo
  • Spinels are magnetic semiconductor ceramics where the cationic distribution is given by the equation M 1-x 2+Fe x 3+[M x 2+Fe 1-x 3+] O42-. Due to the variable atomic arrangement, determined by the type of cation present in the structure and the method of obtaining it, ferrites are multifunctional materials. The application of these materials in electrochemistry has been growing over the years and the possibility of using ferrites as electrodes, either for charge storage devices or in water splitting reactions, brings great opportunities for nanotechnology researchers. In this work we present the synthesis of nickel ferrite nanoparticles (NiFe2O4) by the combined EDTA-Citrate complexation method. We studied the influence of reaction pH (3, 5, 7 and 9) on powder properties and the influence of temperature on phase formation when the reaction pH was set at 7. Structural, morphological, optical, magnetic and electrochemical properties were evaluated. The results confirmed the obtaining of single-phase NiFe2O4 powders at all pH studied (3, 5, 7 and 9) with nanoscale particle size (15-93nm). The morphology of the powders was affected by the reaction pH and exhibited rounded shapes, undefined shapes and triangles. UV-vis analysis reveals an inversely proportional relationship between crystal size and band gap. The isothermal hysteresis at 5 K and 300 K showed ferrimagnetic behavior for all samples obtained. The samples obtained without pH 3 and 9 were tested in an electrochemical cell in alkaline solution and it was found that for the purpose of use in energy storage devices the material was classified as battery-like electrodes. The improved electrochemical behavior of the NF9 sample (Qs = 65 C g-1 in 3 A g-1) was attributed to an increase in faradaic reactions driven by the porosity difference on the surface of the sample agglomerates and the boundary limits of the grains responsible for lower resistance to charge transfer. The NIFe2O4 powders, obtained at pH 7 at 400, 500 and 600 °C, were studied in alkaline solution as electrodes in oxygen evolution reactions reaching an overpotential of 326 mV vs. RHE to generate a current density of 10 mA cm-2 for samples calcined at 400°C. The improved electrochemical behavior compared to literature data was attributed to the microstructural characteristics that affect the charge and mass transport processes and to the reduced particle size.

6
  • LEONETE CRISTINA DE ARAUJO FERREIRA MEDEIROS SILVA
  • Methyl Levulinate synthesis: renewable biomass conversion, kinetic study, and optimization of production

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO WENDELL BEZERRA LOPES
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • PAULA FABIANE PINHEIRO DO NASCIMENTO
  • RICARDO PAULO FONSECA MELO
  • Data: 22-jul-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Lignocellulosic biomass utilization is a sustainable alternative to the oil industry in producing sustainable chemicals. Levulinic acid (LA) is considered a versatile chemical building block generating several products with industrial applications. Methyl levulinate (ML) is one of the levulinic esters considered a promising chemical in the biofuels industry. The development of the present study was divided into three stages: scoping literature review, kinetic study, and optimization of methyl levulinate synthesis from the esterification of levulinic acid in methanol using Al2(SO4)3 as a catalyst. In the first phase, the focus of the scientific production analysis was directed to the possible synthesis routes, reaction parameters, and catalysts employed. The literature points out that Methyl levulinate can be produced from the utilization of lignocellulosic biomass residues, as and without pretreatment, C5 and C6 sugar, monosaccharides (glucose and fructose), derivatives from the decomposition of sugars, and intermediates of the reactions (hydroxymethylfurfural, furfural, furfuryl alcohol, furans, among others) and esterification of AL. The investigated parameters that can affect the feedstock conversions and the ML yield detected were pretreatments of the biomass; type of reactor; temperature and time of the reaction; the ratio between solvents and substrates and the catalyst used (performance, reusability, and effects on the installations). Research is at the laboratory level. However, few large-scale studies and simulations point to the possibility of levulinic ester production in the context of integrated biorefinery. The metallic salts present positive results in face of the problems faced in homogeneous catalysis, thus aluminum sulfate was chosen as a catalyst. The kinetic study performed reactions at temperatures of 120ºC, 140ºC, and 160ºC. From the fit of the experimental data, the pseudo-first-order kinetic model was used to calculate the activation energy, whose value was 11.37 kcal.mol-1. Applying a Box-Behnken type experimental planning of three factors, having as a response the conversion of Levulinic Acid, a significant and predictive regression model was obtained with R² equal to 0.86.  The reactions took place at a temperature of 140 ºC in a 300 mL capacity Parr Instruments stainless steel reactor. The samples were analyzed using high-performance liquid chromatography (HPLC). The results indicated that the interaction of the molar ratio and catalyst concentration significantly influences the conversion of AL. The levels chosen for analysis provided conversions ranging from 86.83% to 99.27%, demonstrating the efficiency of a low-cost catalyst at low concentrations.

     

7
  • DEBORAH CORDEIRO DE ANDRADE
  • Remediation study of contaminated kaolinite with diesel or hexavalente chromium by applying electrokinetics and permeable reactive barrier of cork. 

  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • SALVADOR COTILLAS SORIANO
  • JORGE VIDAL
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DANYELLE MEDEIROS DE ARAUJO
  • ELISAMA VIEIRA DOS SANTOS
  • Data: 19-ago-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In addition to heavy metal pollution, the environment faces contamination through organic components. Related to the oil industry, soil fuel pollution is generally related to accidental spills during handling, transport or storage activities in underground storage tanks, distribution systems or industrial crude oil refining activities. This is a serious environmental issue, due to the high negative impact of fuel contamination on the quality of water reservoirs, which prevents the use of this water for human consumption and the dangerousness of the chemical species contained in the fuel for the organisms that live in the soil. In order to fulfill these objectives, electrokinetic remediation combining granules of cork as a reactive permeable barrier and surfactants / chelating agents with low environmental impact are the technologies chosen for the study of the removal efficiency of the contaminants presented in this project, with the purpose of producing and contributing with new data on soil decontamination to be applied on a large scale.

8
  • MARIA ROSIANE DE ALMEIDA ANDRADE
  • Biodiesel: Synthesis, Life Cycle Assessment, and Performance in a Diesel Engine

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • ANDREA OLIVEIRA NUNES
  • BRUNA RÊGO DE VASCONCELOS
  • FRANCISCO WENDELL BEZERRA LOPES
  • JEAN MICHEL LAVOIE
  • JOSE MARIANO DA SILVA NETO
  • Data: 14-sep-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • Reductions in greenhouse gas emissions and fossil fuel depletion are among the main reasons for pursuing the development of biofuel technologies. In that sense, biodiesel represents a suitable alternative to fossil fuel since it is renewable, biodegradable, non-toxic, and reduces hydrocarbons, sulfur, carbon monoxide, and polyaromatic hydrocarbons emission. The main production route for biodiesel is the methyl transesterification of triglycerides using a homogeneous base catalyst, such as potassium hydroxide. However, these catalysts produce soap, they are not recovered and reused, and the biodiesel purification process generates a large amount of wastewater. In this sense, studies have been developed to enable the use of heterogeneous catalysts because they produce less waste and can be recovered and reused. One of the most used heterogeneous catalysts is calcium oxide. Therefore, the present work uses calcined chicken eggshells as catalysts for the soybean oil methyl transesterification reaction and nonylphenol ethoxylate surfactants as interfacial tension reducing agents, improving the contact between the phases. To evaluate the environmental impacts caused by biodiesel production, a life cycle assessment (LCA) of the biodiesel synthesis method proposed in this work was performed, using the surfactant and considering the catalyst synthesis step. In addition, a comparative study of the environmental impacts generated with the usual biodiesel production process using potassium hydroxide as homogeneous catalyst was performed. Another aspect evaluated in this work was the distillation of biodiesel, where two fractions were obtained, one with a higher concentration of light esters and another fraction with a higher concentration of heavy esters. The fractions obtained were added to commercial diesel and the new fuels were tested in a diesel engine in order to evaluate the effect of these fractions on combustion and engine performance. The results showed that the use of surfactants reduces the methanol to oil molar ratio and the reaction time. With the addition of 1.5 % surfactant, using a methanol to oil molar ratio of 4:1 and 2 %wt catalyst, it was possible to obtain a conversion over 90 % for a reaction time of 1.5 h.  The LCA showed that biodiesel production using the surfactant is 77% more eco-efficient and has less environmental impact than the usual process using KOH. The addition of the distilled biodiesel and its fractions to the diesel promoted a lower specific consumption as well as an increase in thermal efficiency.  Regarding the emission analyses, there was a reduction up to 35% in carbon monoxide emissions with the addition of biodiesel.

9
  • VITOR TROCCOLI RIBEIRO
  • Influence of Tween 80 on pretreatment by steam and alkaline explosion, enzymatic hydrolysis and fermentation for ethanol production from green coconut fiber

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • NATHALIA SARAIVA RIOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 09-dic-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  •  

    The green coconut fiber has been pointed out as an interesting alternative for the production of bioethanol, as Brazil has one of the largest global productions of the fruit and its inadequate disposal causes environmental problems. However, the high recalcitrance of green coconut makes it difficult to convert it into large volumes of bioethanol. Pretreatments are necessary to destroy the crystalline structure of cellulose and increase the efficiency of enzymatic hydrolysis. Steam explosion pretreatment has a low environmental impact and whose main consequence is the removal of hemicellulose. Furthermore, the addition of non-ionic surfactants in the bioethanol production process has been studied as a strategy to increase its production and yield. Among these, Tween 80 stands out because it has a lower cost than other additives. The goal of this study was to evaluate the ethanol production from green coconut fiber using a combined steam explosion and alkaline pretreatment, comparing the simultaneous saccharification and fermentation (SSF) and semi-simultaneous saccharification and fermentation (SSSF) strategies. The use of Tween 80 in the pretreatment, enzymatic hydrolysis, and fermentation steps was also investigated. Initially, the influence of the temperature and humidity in the steam explosion pretreatment were evaluated in the glucose production. As there was no delignification after steam explosion, and to increase enzymatic digestibility, an alkaline pretreatment with sodium hydroxide was carried out in sequence. The combination of steam explosion pretreatment and alkaline pretreatment of green coconut fiber led to cellulose contents above 47.22 ± 1.06% (w/w), which initially were 30.68 ± 0.52% (w/w), and maximum glucose yield equal to 54.74%. Surfactant did not increase delignification in the steam explosion pretreatment, however it increased the conversion to glucose when compared to experiments without Tween 80. The use of surfactant in enzymatic hydrolysis increased glucose production reaching a maximum value of 20.31 ± 0.48 g/L with combined pretreated biomass when 1.0% (w/v) surfactant was added. In the absence of surfactant in any steps, the SSSF strategy stood out over the SSF. SSSF increased the yield and ethanol production and the strain that obtained the best production was Saccharomyces cerevisiae PE2, reaching a maximum ethanol production equal to 24.88 ± 1.04 g/L under 15% (w/v) solids. Different effects of Tween 80 were observed during fermentation. The use of 2.0% (w/v) Tween 80 reduced cell viability as well as reduced ethanol production in simulated medium, in SSF and SSSF. On the other hand, the use of 1.0% (w/v) Tween 80 increased the average ethanol production, although not enough to be statistically significant. To increase ethanol production under 30% (w/v) solids loading, SSSF variations were performed, including batch addition of biomass, batch addition of enzymes and temperature variation every 6 h. SSSF with non-isothermal batch feeding and gradual addition of enzymes stood out, reaching a maximum ethanol produced of 48.21 ± 1.13 g/L in the presence of 1.0% (w/v) Tween 80. Therefore, the results show that the use of the combined pretreatment generated a biomass with high cellulosic content that has a great potential for cellulosic ethanol production when fermentation strategies with Tween 80 were evaluated.

10
  • PETRÚCIA KARINE SANTOS DE BRITO BEZERRA
  • Butanol Production by Clostridium beijerinckii using green cococut fiber lignocellulosic residue

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • MARCELINO GEVILBERGUE VIANA
  • PEDRO FERREIRA DE SOUZA FILHO
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 15-dic-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • The search for renewable energies that minimize the environmental damage caused mainly by the burning of fossil fuels has supported studies for the diversification of the global energy matrix. In the case of Brazil, the insertion of new biofuels such as butanol associated with the valorization of lignocellulosic biomass presents an opportunity to consolidate its historical vocation in the leadership of renewable energy sources, especially when the world seeks solutions to mitigate climate change. The green coconut shell, for example, is an abundant agro-industrial and urban waste that can be transformed into the substrate and then converted into products of industrial value, adding value to the production chain, and solving environmental problems related to its disposal. In this context, we investigated the potential of the green coconut husk in the production of cellulosic butanol (or biobutanol) by ABE (Acetone-Butanol-Ethanol) fermentation, using Clostridium beijerinckii. Initially, enzymatic hydrolysis tests were carried out to extract information about the release of sugars from green coconut shells (GCS) and the ability to recycle commercial cellulolytic cocktails. The behavior and recovery of cellulolytic enzymes remaining from GCS delignified by different pre-treatments (dilute acid, alkaline, and acid-alkaline) were evaluated. At another time, batch fermentation tests investigated the influence of some nutrients (nitrogen sources and mineral medium) on hydrolyzed supplementation to produce butanol and other solvents. Adsorption and desorption studies involving two types of cellulases (Trichoderma reesei ATCC 26921 and Cellic Ctec2, 10 FPU/g, initial dosage) with 5% solids loading showed that CCV delignified by alkaline (LCM1) and acid-alkali pretreatments (LCM3) showed lower cellulase adsorption capacity (48% and 69%). The LCM3 pretreatment provided the highest recovery of cellulase by desorption without the addition of Tween 80 (reaching 50%). Cellulases bound to the solid residue and dissolved in the supernatant after enzymatic hydrolysis (HE) can be reused in a new cycle without compromising the sugar yield results. Using GCS as a substrate, the addition of the solid residue and the supernatant from the previous cellulase adsorption stage reached satisfactory sugar yield (73% for LCM1 and 60% for LCM3) only using the recycled enzyme (without the addition of enzyme) concerning the control assay. Thus, it was possible to recycle the cellulases in two successive cycles of HE with reduced enzymatic load to reach the same yields of reducing sugars (up to 84%), allowing cheaper and more efficient hydrolysis of lignocellulosic biomass. ABE fermentation assays evaluated the influence of some nutrients, nitrogen sources, and minerals on hydrolyzed supplementation to produce butanol and other solvents. It was found that ~9.0 g/L of the initial substrate (glucose + xylose) present in the hydrolyzate resulted in an ABE yield of 0.53 g/g of sugars1, with 3.4 g/L of butanol produced in 96 h of fermentation, using the initial inoculum concentration of 1.0 g/L. The absence or insufficiency of some nutrients (minerals and phosphate buffer) resulted in low ABE production, indicating the relevance of the adequacy of supplements to the chosen fermentation medium and the type of microorganism used. Fed-batch fermentation resulted in higher butanol and ABE yields (0.08 g/L.h and 0.1 g/L.h, respectively), despite lower butanol and ABE yields (0.21 g/g and 0.24 g/g, respectively). The results indicate that green coconut waste has energy potential and is the low-cost raw materials for the biotechnological production of butanol, as an alternative and renewable product.

11
  • ISLANNY LARISSA OURIQUES BRASILEIRO
  • DEVELOPMENT OF ZnO/g-C3N4 AND ZnFe2O4/g-C3N4 HETEROJUNCTIONS FOR PHOTODEGRADATION OF EMERGING ORGANIC CONTAMINANTS

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • MAITÊ MEDEIROS DE SANTANA E SILVA
  • REGINA DE FÁTIMA PERALTA MUNIZ MOREIRA
  • VIVIAN STUMPF MADEIRA
  • Data: 16-dic-2022
    Ata de defesa assinada:


  • Resumen Espectáculo
  • In recent years there has been growing concern about the contamination of water by emerging contaminants - substances that are not completely degraded by conventional processes of water and wastewater treatments and are not biodegradable. For this reason, several techniques have been developed to efficiently treat such compounds. In this work, different heterojunctions of ZnO/g-C3N4 and ZnFe2O4/g-C3N4 in different mass proportions of g-C3N4 (10, 50, and 80 %) were synthesized through a simple method of mixing, sonication and heat treatment. The influence of the amount of g-C3N4 in the heterojunctions as well as the influence of the type of zinc-based catalyst on the structural, morphological, optical, and photocatalytic properties of the materials were investigated. The XRD, FTIR, and SEM/EDS results confirmed the achievement of the desired heterojunctions. The incorporation of g-C3N4 was relevant in modifying the textural and optical properties of the heterojunctions produced. The 50-Zn/gCN heterojunction showed better photocatalytic degradation of the antibiotic cefazolin (78 %) and the dye RB5 (95 %) in 120 min of the experiment, when compared with the pure materials and with the other heterojunctions. In addition, it exhibited faster reaction kinetics and good photostability. The best photocatalytic performance presented by this material can be attributed to the real synergistic effect between ZnO and g-C3N4, which promoted relevant interaction in a possible mechanism of Z scheme type, as verified in the PL analysis. The results of the experimental design showed that the catalyst concentration and the pH are the variables that most influence the cefazolin photodegradation, whereas for RB5, all the evaluated variables were significant for 95% confidence. 50-Zn/gCN exhibited 100% degradation for both contaminants evaluated in 90 min of reaction for cefazolin and in 10 min for RB5, under the following conditions: catalyst concentration 0.5 g L-1, contaminant concentration 5 mg L-1 and pH 2.5. Adsorption played a key role in the photodegradation of RB5. However, the degradation of the dye (adsorbed and remaining in the solution) and the regeneration of the catalyst surface were due to photocatalysis. The Z-scheme mechanisms for the photocatalytic reactions of cefazolin and RB5 have been adequately proposed, in which the photogenerated holes in the valence band of ZnO and the electrons in the conduction band of g-C3N4 were the main degradation pathways of cefazolin and RB5, respectively. The evaluated heterojunction showed good photostability for both contaminants. Finally, the promising character of 50-Zn/gCN synthesized for application in photocatalytic reactions mediated by sunlight for the degradation of contaminants of different classes, as well as the possibility of its use as an efficient alternative to minimize water pollution caused by overuse of medication during the COVID-19 pandemic. 

2021
Disertaciones
1
  • TALITA KÊNYA OLIVEIRA COSTA
  • Evaluation of conversion of soybean oil in biodiesel using short chain alcohols

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO WENDELL BEZERRA LOPES
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • Data: 19-mar-2021


  • Resumen Espectáculo
  • Biodiesel is one of the alternatives in reducing environmental impacts as it is a fuel derived from renewable raw materials such as vegetable oils and animal fats. It can be obtained through the transesterification reaction between an alcohol and triglycerides in the presence or not of a catalyst, having as product an ester, which is biodiesel, and glycerin. The objective of this work was to evaluate the use of short chain alcohols in the transesterification reaction of soybean oil, using a homogeneous base catalyst (potassium hydroxide), obtaining as a result the model for the conversion of the reaction and the reaction kinetics for the biodiesel made with butanol. The transesterification reactions were carried out in a jacketed glass reactor, with a coupled condenser and a heating bath. Initially, reactions were carried out with different alcohols varying the molar ratio alcohol: oil to biodiesel using methanol, ethanol, 2-propanol and butanol as alcohol, soon after a factorial design 23 was made with butanol in the reaction and with the following conditions: alcohol: oil ratio of 4:1 to 8:1, 1 to 2%, 1 to 2 hours and 65 ° C. To obtain the kinetic curve, samples of the reaction were taken between the initial time and 60 minutes. For all samples, density and viscosity were analyzed and their conversions were measured using thermogravimetric analysis and gas chromatography. In the density analysis, of the reactions of the factorial design, it varied between 889.41 kg/m3 and 850.18 kg/m3, whereas for the viscosity it varied between 11.10 cSt and 3.10 cSt. By increasing the conversion to ester, the density and viscosity decreased in their values. For the conversion analysis, the four types of alcohol with a 10:1 molar ratio were found: methanol 99.28%, ethanol 81.72%, 2-propanol 7.50% and butanol 49.74%. For planning with butanol, the optimum point occurred with an 8:1, 2% mass ratio of catalyst, for two hours, where it obtained 76.24% conversion. With the model obtained by factorial design, it was found that the three factors analyzed were significant, with an average error between the predicted and experimental values of 2.3%. The reaction was shown to be of second order with a kinetic constant of 3x10-5 min-1. Thus, it can be concluded that the biodiesel produced with butanol obtained conversion values consistent with the works found in the literature, making this alcohol an alternative in the production of biofuel due to renewable sources and better lubricity of the fuel.

2
  • ELTON DA NÓBREGA SILVA
  • Synthesis of Copper Ferrite and its Application in Photochemical Degradation of 2,4-D

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • VIVIAN STUMPF MADEIRA
  • Data: 07-may-2021


  • Resumen Espectáculo
  • The increase in the consumption of pesticides, including herbicides, has caused a series of discurssions regarding its application and their consequences for humans and the environment. One of the most widely used herbicides in the world is 2,4-dichlorophenoxyacetic acid (2,4-D), however, its presence has been reported to be present in water bodies, causing impacts on the health of animals and humans. To degrade this contaminant, in this work copper ferrite (CuFe2O4) was synthesized using coprecipitation method and tested in photocatalytic reactions for the degradation of 2,4-D herbicide in aqueous solution, through heterogeneous photocatalysis with and without the addition of auxiliary oxidizing agents. The samples were was synthesized using the ratio 0.1 and 0.5 metal / base, using two types of salts, one with the Fe2+ ion and the other with the Fe3+ ion. A sample by the Pechini method was synthesized for comparative purposes. The catalysts were collected in a thermogravimetric test and calcined at 600°C. X-ray diffractograms were performed to determine the formation of the copper ferrite phase. A preliminary photocatalytic test was carried out to choose the catalyst with the best performance, the best sample being 0.1_Fe3+Cu, which with H2O2 degraded a large amount of 2,4-D. The parameters of the photocatalytic experiments were studied, such as: pH, concentration of catalyst, concentration of herbicide, concentration of oxidizing agent. The catalyst degraded 100% of the herbicide in 60 min of reaction. With the experimental data, following the law of the initiates, a law of speed was created that represents the model of the system. The law of speed followed a Langmuir-Hinshelwood kinetics and the reaction mechanism was studied, being possible that the catalyst obtained high performance in the degradation of 2,4-D with H2O2.

3
  • MATEUS FERNANDES MONTEIRO
  • MONOETHYLENE GLYCOL REGENERATION UNIT: EXPERIMENTAL DATA AND THERMODYNAMIC MODELING

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ANDERSON ALLES DE JESUS
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • OSVALDO CHIAVONE FILHO
  • Data: 17-jun-2021


  • Resumen Espectáculo
  • Gas hydrates are crystalline solids and may cause several harsh consequences for natural gas production in subsea lines. Monoethylene glycol (MEG) is the most used thermodynamic hydrate inhibitor. Vapor–liquid equilibrium (VLE) data for aqueous systems in the presence of electrolytes have many industrial applications. VLE data for water + MEG mixtures in the presence of sodium chloride at low pressures are important to describe the effects of composition, temperature and pressure on MEG regeneration unit. The regeneration aims to remove water and salt present in the rich MEG stream, resulting in lean MEG. In the gas production context, MEG is regenerated to reduce operational costs, due to the large amount required. The MEG regeneration process consists mainly of a three-phase separator, flash evaporator with brine removal, and distillation column. A modified version of the Othmer ebulliometer was applied to measure reliable VLE data for water + MEG + NaCl at 101.325, 65 and 35 kPa. Binary systems water + MEG and MEG + NaCl were also experimentally studied. The Electrolyte Nonrandom Two-Liquid (ENRTL) and Universal Quasi-Chemical Activity Coefficient (UNIQUAC) models were successfully parameterized to describe the VLE behavior for water + MEG+ NaCl systems. Thermodynamic consistence of the datasets was also checked. MEG+NaCl solutions presented an inverted colligative property, i.e., the addition of salt decreases the boiling point. NaCl solubility were also measured from 293.15 to 403.15 K in the whole MEG concentration range. The experimental method used for the determination of salt solubility data was analytical (density measurements) and based on the reproducibility of the concentration of two successive samples. The temperature dependence on the solubility of NaCl is relatively weak compared to other salts and a reverse trend behavior with increasing temperature has been described for MEG contents higher than 90 wt%. Excess solubility has been correlated with Redlich–Kister expansion. Solid–liquid equilibrium data were also used for ENRTL parametrization. The parameterized models allow the simulation of the MEG regeneration process in the Aspen Plus, describing satisfactorily water and NaCl separation at flash evaporator and distillation column.

4
  • MÁRIO HERMES DE MOURA NETO
  • Experimental Data and Computational Method for the Determination of Composition in the Monoethylene Glycol Regeneration Process

     
  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • ANDERSON ALLES DE JESUS
  • JACKSON ARAUJO DE OLIVEIRA
  • OSVALDO CHIAVONE FILHO
  • Data: 17-jun-2021


  • Resumen Espectáculo
  • Gas hydrates are crystalline solids formed by the combination of small gas molecules (e.g. CO2 and methane) and water. These solids may form in Natural Gas production lines, causing great damage, such as partial or total obstruction of the production flow and rupture of the pipelines. Monoethylene glycol (MEG) is a thermodynamic gas hydrate inhibitor widely applied for natural gas flow assurance. To ensure financial and environmental feasibility the MEG needs to be regenerated and reused. A series of density and electrical conductivity measurements of water+MEG+NaCl mixtures was reported allowing indirect supervision of the MEG regeneration unit (MRU). Density (610 data points) and electrical conductivity (250 data points) measurements were performed from 278.15 to 363.15 K, the complete concentration range of solvents and NaCl up to almost saturation. The solution theory was applied for density modeling purpose, using the excess volume ( ). The  was correlated with the aid of the Redlich–Kister equation. A semiempirical correlation with five adjustable parameters was applied for electrical conductivities of water+NaCl and MEG+NaCl binary mixtures. To describe the ternary system, a quadratic mixing rule with a correction parameter accounted for the solvent composition. Accurate thermodynamic correlations for density (ρ) and electrical conductivity (κ) as function of water, MEG and, NaCl concentrations and temperature were obtained. These functions allowed the determination of VLE data for water+MEG mixtures in the presence of NaCl at low pressures, which are important to describe the effects of composition, temperature, and pressure in the MRU. A modified version of the Othmer ebulliometer was applied to measure reliable VLE data for water+MEG+NaCl at 101.325, 65, and 35 kPa. The Electrolyte Nonrandom Two-Liquid and Universal Quasi-Chemical Activity Coefficient models were parameterized to describe the VLE behavior of water+MEG+NaCl. MEG+NaCl solutions presented an inverted colligative property, i.e., the addition of salt decreases the boiling point. VLE data indicated that water separation is less efficient due to the addition of salt. The ρ and κ functions also presented an approximately orthogonal behavior to each other, allowing the determination of mixture composition. The Matlab environment was considered to solve the nonlinear system of two equations with constraints. The fmincon built–in function was found robust for composition determination from the experimental density and electrical conductivity data. The proposed methodology was extensively tested (860 data points) and deviations less than 0.0060 and 0.0011 in solvents and NaCl mass fractions were obtained, demonstrating the required accuracy.

     
5
  • ESTEFANI ALVES ASEVEDO
  • Production and extraction of carotenoids produced by microalgae of Dunaliella salina and Anikistrodesmus sp. 

     
  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • BRUNA MARIA EMERENCIANO DAS CHAGAS
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • Data: 29-jul-2021


  • Resumen Espectáculo
  • Given the current scenario of intense environmental degradation by conventional production mechanisms, the development of environmentally sustainable alternative routes is essential. In this context, the biotechnological potential of microalgae is highlighted, since the production of this microorganism has economic and environmental advantages in addition to the natural production of compounds beneficial to human health. Based on these facts, this dissertation proposes the production of microalgal biomass of Dunaliella salina and Anikistrodesmus sp. aiming at the extraction of bioactive compounds such as carotenoids, evaluating cultivation conditions and extraction techniques supported by a minimal environmental degradation approach. 

     
6
  • STEPHANIE CAROLINE BIVAR MATIAS
  • EVALUATION OF PRODUCTION STRATEGIES IN DISCONTINUOUS CULTIVATION OF Toxoplasma Gondii MULTI-ANTIGENIC CHIMERIC PROTEIN TgAGSS/BsT IN Escherichia coli

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • NATHALIA SARAIVA RIOS
  • Data: 17-ago-2021


  • Resumen Espectáculo
  • Despite the advances in science and technology, toxoplasmosis does not yet have a vaccine capable of immunizing humans and animals against all isolated types of T. gondii. The treatment of this disease is based on the use of drugs that have some toxicity and can cause serious side effects justifying the need for the development of vaccines or immunotherapeutic as preventive measures. Due to the great diversity of antigens presented by Toxoplasma gondii, a vaccine and diagnostic kit containing multiple antigens is quite promising. Among the bacteria used to produce recombinant proteins, Escherichia coli is the most widely used because of its well described genetic characteristics. In this context, the present work has as main focus to evaluate discontinuous cultivation strategies in the production of Toxoplasma gondii multi-antigenic chimeric protein TgAGS / BsT performed in a rotary incubator. To achieve the proposed objective, several assays will be performed to observe the kinetic behavior of the E. coli XL-1 Blue strain in five different medium compositions (2xTY, glucose supplemented TB, glycerol supplemented TB, LB and M9) without addition of inductor in rotary incubator. In addition, the stability of the plasmid, the influence of the medium on the kinetic parameters of E. coli cell growth will be evaluated. and TgAGS / BsT multi-antigen chimera protein expression and acetic acid formation.

7
  • JOSE DALADIE BARRETO DA COSTA FILHO
  • Valorization of corn cob: Potential for ethanol production and application of residual lignin from enzymatic hydrolysis as cationic dye adsorbent

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • EVERALDO SILVINO DOS SANTOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 18-ago-2021


  • Resumen Espectáculo
  • The conversion of lignocellulosic materials into fermentable sugars for ethanol production has been a promising alternative to increase biofuel production. However, the production of cellulosic ethanol requires an improvement in its main stages, including pretreatment, for which research has shown many possibilities. Oxidative pretreatment has gained space in the literature in the last decade, however studies with persulfate are still limited. In this context, this study aimed to investigate the effects of oxidative pretreatments with thermally activated sodium persulfate (Ox) and organosolv with acidified glycerol (Os) on corn cob, as well as to dispose of the fractions obtained after each stage. The effects on the composition after Os and Ox pretreatments were evaluated, as well as the combinations of sequential step strategies (oxidation followed by organosolv - OxOs; and organosolv followed by oxidation - OsOx) and the synergistic effect in a single step, in the presence of sulfuric acid (Oxs) or without acidification (GP). In compositional terms, the combination of techniques in two steps (OxOs and OsOx), regardless of the order of performance, and in a single step (Oxs) were responsible for the highest rates of lignin and hemicellulose removal. The recovered glycerol-based fluid phases, due to their acidic nature (pH < 1), have the potential for efficient recycling in new pre-treatment steps. The pretreated and untreated (in natura) biomass were subjected to enzymatic hydrolysis with a solids load of 5% (m/v) and an enzymatic load of 10.0 FPU/g of biomass for 48 hours. After saccharification, the hydrolyzate was separated to determine the concentration of reducing sugars and glucose. The highest concentrations were obtained with OxOs, while OsOx and Oxs showed statistically equal results, therefore, the hydrolysates of Oxs (HOxs) and OxOs (HOxOs) were applied in fermentation for 72 hours with Saccharomyces cerevisiae PE-2, while solid residues (ROxs and ROxOs) were intended for adsorption tests of the cationic dye methylene blue (AM). The hydrolyzate (HOs) and solid (ROs) of the organosolv were used as controls in the experiments in order to evaluate the role of oxidation. Rapid ethanol production in the initial 12 hours of incubation was achieved with HOxs and HOxOs (~10 g/L). The compositional characterization of ROs, ROxs and ROxOs residues indicate the presence of undigested polysaccharides during saccharification, but with a majority composition of lignin (~75%), consistent with thermogravimetric and FTIR analyses. Scanning electron microscopy (SEM) showed severe fiber digestion of corn cob in the three residual solids, as well as evidence of increased porosity in ROxs and ROxOs. The kinetic adsorption assays revealed a fast AM capture in the initial minutes, but with a slow concentration decay even after 2 hours. The kinetics that best fit the experimental data was the pseudo-second order type. The Langmuir isotherm was able to satisfactorily represent the equilibrium points analyzed after 24 hours of incubation (R² > 0.98). In both curves (kinetic and equilibrium), biomass residues submitted to oxidative pretreatment showed greater efficiency in capturing AM, a behavior corroborated by the estimation of the maximum adsorptive capacities of ROs (149.33 mg/g), ROxs (172.10 mg/g) and ROxOs (187.50 mg/g). Therefore, it can be concluded that the application of organosolv with oxidation by temperature-activated persulfate proved to be an efficient technique for cellulosic conversion in saccharification and consequently in ethanol production, as well as having positive effects on the adsorption of cationic substances.

8
  • ANA CARLA DA FONSECA FERREIRA
  • Removal of organic matter from shrimp effluent using an activated sludge system.

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EMILIANNY RAFAELY BATISTA MAGALHAES
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 27-ago-2021


  • Resumen Espectáculo
  • Due the growth of demand for new food sources, shrimp farming has become one of the main aquaculture activities. However, the high amount of non-treated effluent released into water bodies  generate a growing concern about the environmental impacts. Activated sludge system is a good alternative treatment for shrimp farming effluent. Thus, the objective of this work is evaluate the efficiency of organic matter removal from a real shrimp farming effluent by activated sludge treatment system in different operational and process conditions. The optimum condition of operation will be determinate for the release of the effluent in concordance with the legislation.

9
  • TALITA LORENA DA SILVA DO NASCIMENTO
  • BIOADSORBENT DERIVED FROM THE AQUATIC PACHIRA Aubl.  FOR METALS REMOVING IN INDUSTRIAL EFFLUENTS

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • FABÍOLA DIAS DA SILVA CURBELO
  • KARINE FONSECA SOARES DE OLIVEIRA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • Data: 31-ago-2021


  • Resumen Espectáculo
  • The use of agro-industrial products to remove contaminants through the adsorption process has been a sustainable alternative due to its renewable origin, abundance, low cost and efficiency compared to commercial coal. In this sense, the present study aimed to investigate the use of a bioadsorbent derived from the fruit peel of aquatic Pachira for the removal of metallic ions in aqueous solution. The bioadsorbent was produced by carbonization of the biomass husks at 450 °C, and characterized through immediate analysis, XRD, SEM, the zero charge potential, zeta potential, thermal analysis and Boehm titration. The full factorial design with central points was applied to optimize the adsorption tests and verify the influence of the concentration of Ni2+ and Cd2+ metallic ions, adsorbent mass and temperature on the removal capacity of such ions. The adsorption tests were developed using batch and fixed bed column systems. The kinetic models of the multielementary solutions showed that a chemisorption process occurred, whereas the isotherm models that best fit the experimental data were Freundlich and Langmuir for Ni2+ and Cd2+, respectively. The study of adsorption thermodynamics showed that the system, for both ions, is endothermic, since the ΔH values were positive, and that the adsorption conditions are non-spontaneous, indicated by the positive ΔG results. Furthermore, the results of ΔH >20 kJ/mol for both ions confirmed that the process occurred was that of chemisorption. The rupture curves showed that at a flow rate of 3mL/min and bed height of 12 cm there were better removal results, with the rupture time for the initial concentrations of 100 mg/L of Ni2+ and Cd2+ equal to 30 and 36 min, respectively. The adsorption capacity of metals in the fixed bed column was greater for Cd2+ than Ni2+, with removal of 99% and 89% respectively. It was observed that for adsorbate concentration of 100mg/L, the break-up time was reached very quickly, however, by decreasing the concentration to 45mg/L, this time was increased by about 6x. The bioadsorbent produced from the fruit peel of the Pachira aquática has the potential to remove metals in industrial effluents, providing sustainable valorization of a forest by-product through its application in effluent treatment systems.


10
  • RAQUEL REVOREDO PINHEIRO DE SOUZA
  • Technical Analysis to Increase Productivity of Solar Desalinizers Through Modeling and Simulation
  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • Data: 24-sep-2021


  • Resumen Espectáculo
  • Aware of the global need to ensure access to drinking water and that most of the water on the globe contains salinity levels that make it impossible to consume and use it in the home, we propose, in this work, simulations that allowed us to understand some of the phenomena relevant to the functioning of solar desalinators, mainly aimed at optimizing the water production capacity from conventional equipment to modified equipment. For this, simulation in EMSO software was used, starting from the mathematical modeling of energy balances. Daily productivity results were obtained of 1.5671 L/m² for the conventional model, 1.8604 L/m² for the modified model with low pressure, 1.7416 L/m² for the modified model with a 50W heat source , 1.9646 L/m² for the modified model with a 100W heat source and 2.1970 L/m² for the modified model with a 150W heat source. The results of nanofluids did not fit the proposed model, since the model used in the literature is not, according to what we have seen, capable of describing the phenomena. Furthermore, the results were compared with experimental data from the Northeast region, obtaining 2.7310 L/m² of daily production. The results made it possible to understand the characteristics of the different models regarding heat transfer, as well as it was possible to evaluate the best equipment represented by the model and its cost-benefit ratio. Within these characteristics, the modified model with a 150W heat source was the best fit.

11
  • THAIS CARTAXO DE ALMEIDA
  • Obtaining the prolyl endoprotease enzyme from Aspergillus sp. in malt bagasse and comparison with similar commercial enzyme in the production of gluten-free beer

     
  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA SARAIVA RIOS
  • SHARLINE FLORENTINO DE MELO SANTOS
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 16-dic-2021


  • Resumen Espectáculo
  • The beer consumer market has been presenting a change in Brazil with the search for differentiated products and with higher quality, the craft beers. However, beer is a drink that contains gluten and can not be consumed by people with celiac disease. In addition, the search for gluten-free foods by people who do not have the disease has shown a considerable increase due to the search for a healthier lifestyle since gluten-free foods have a low caloric content. Thus, the search for ways to produce beer without the presence of gluten, but maintaining its raw materials base (water, barley malt, hops and yeast) has been the subject of research. In this context, the present study aims to produce the enzyme prolil endoprotease from Aspergillus sp. com malt bagasse as a substrate as well as compare with a similar commercial enzyme produced from Aspergillus niger (AN-PEP) in the production of a gluten-free beer aimed at optimizing the temperature and concentration of the same. In addition, a gluten-free beer will be produced with the commercial enzyme, which will be characterized and after sensory analysis, will be compared to beer obtained with gluten under the same conditions.


     
Tesis
1
  • DENNYS CORREIA DA SILVA
  • Ionic flocculation and liquid-liquid extraction using surfactants and microemulsified systems to remove oil from produced water

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • PAULA ROMYNE DE MORAIS CAVALCANTE NEITZKE
  • RICARDO PAULO FONSECA MELO
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 15-mar-2021


  • Resumen Espectáculo
  • The produced water (AP) is one of the main sources of pollution derived from the oil industry and represents one of the most important environmental concerns. In this work, surfactants and microemulsion systems were used to remove dispersed oil from the AP by ion flocculation and liquid-liquid extraction methods. For experiments involving ionic flocculation, an alternative was presented for the removal of oil from the water produced using the ionic surfactant babassu coconut oil (OCBS) as part of the capture of oil by micellar solubilization, followed by ionic flocculation by Ca2 + ions. A factorial experimental design was applied in order to optimize the oil removal process (ER). The experiments investigated the influence of the surfactant concentration + CaCl2 (C), temperature (T) and agitation speed (v), obtaining ER = 70.02-91.49%. Subsequently, the influence of pH, CaCl2/surfactant ratio and oil removal kinetics (t) on the system with the highest ER was evaluated, obtaining E_R = 100%. Then, the optimal system for greater oil removal was reproduced using microemulsions as flocculants having OCBS as surfactant, presenting ER = 100%. Thus, it can be said that the application of ionic flocculation using OCBS is an efficient technique in the treatment of PA. For experiments involving liquid-liquid extraction, the systems used were composed of AP as an aqueous phase; aviation kerosene as an oily phase; isoamyl alcohol and 1-butanol as co-active agents; and Dissolvan® and Lipesa® as surfactants. An experimental plan was applied to optimize the process and the experiments were carried out according to the Scheffé network, showing oil removal efficiencies (ER) between 24-99%. The microemulsion extraction point used for the optimization of the process was composed of 60% by weight of AP, 5% by weight of kerosene and 35% by weight of the cosurfactant/surfactant ratio (C/S = 9 ratio). The effects of the C/S ratio, microemulsion load capacity, oil removal kinetics, temperature, and phase separation speed were evaluated. From these tests, it was possible to obtain 100% oil removal using C/S = 9, t = 25 min, T = 50–60 ° C, demonstrating the viability of the evaluated systems. Comparing the two techniques, it was possible to verify that the ionic flocculation presented greater advantage for using fewer components obtaining high values of oil removal.

2
  • CLEITIANE DA COSTA NOGUEIRA
  • Cellulosic ethanol production under high concentrations of ethylene oxide-based polymers

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EMMANUEL DAMILANO DUTRA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCINALDO LEITE DA SILVA
  • PEDRO FERREIRA DE SOUZA FILHO
  • TELMA TEIXEIRA FRANCO
  • Data: 12-abr-2021


  • Resumen Espectáculo
  • The conversion of agro-industrial wastes such as green coconut husk (GCH) and corncob (CC) into ethanol is a promising alternative for Brazil to overcome industrial, economic and environmental issues. However, the cellulosic ethanol production requires an improvement in its main stages: pretreatment, enzymatic hydrolysis and fermentation. For this purpose, researches have shown many possibilities. Among them, it can be highlighted the use of polymers such as polyethylene glycol (PEG) and its derivatives as coadjuvants in these stages, since, in addition to beneficially assisting the pretreatment of biomass, it has favored the enzymatic activity and increased the vitality, viability and tolerance of the yeast in fermentation media with inhibitors. Therefore, this study evaluated how the type of polymer and its concentration can influence the performance of each stage. For this, the GCH and CC biomasses (untreated and pretreated in hydrothermal, acid and alkaline conditions) and SigmaCell cellulose, yeasts (Saccharomyces cerevisiae CAT-1 and Kluyveromyces marxianus), and polymers (Triton X-100, Tween 80, PEG 4000 and EOPO 5800) at different concentrations were used during the studied stages. In addtion, fermentative strategies have been proposed to integrate these steps by using polymers. In fermentations in inhibitory medium, the polymers PEG and ethylene oxide-propylene oxide (EOPO) acted as detoxification agents, maintaining the cell viability and the ethanol production similar to the control without inhibitor and polymer. This behavior was directly related to the concentration of the polymer up to the values of 175 and 100 g.L-1 for PEG 4000 and EOPO 5800, respectively. In simulated enzymatic hydrolysis, PEG and EOPO increased cellulolytic activity and the release of fermentable sugars in an environment rich in lignin. PEG 400 was successfully used in the simultaneous saccharification and fermentation (SSF) of the slurry from the pressurized hydrothermal pretreatment, increasing the ethanol titer from 6.43 g.L-1 (control without PEG) to 7.87 g.L-1. During acid pretreatment, PEG increased the delignification of the CC. However, the effect of polymers was more pronounced with the GCH for the subsequent stages of hydrolysis and fermentation, probably because of the high biomass lignin content. The results of SSF with liquor and PEG for pretreated acid and hydrothermal GCH were 8.8±0.8 g.L-1 and 9.3±1.2 g.L-1 of ethanol, respectively. However, these values were exceeded when using untreated coconut (9.7±0.5 g.L-1). Batch SSF from untreated GCH reached 89.8% mass yield of ethanol, using 175 g.L-1 PEG 4000, 20 FPU.g-1 and 1x108 cells.mL-1 of S. cerevisiae CAT-1. The addition of PEG made it possible to operate the batch fed SSF using up to 30% (w/w) of solid loading, 13.3 FPU.g-1 of enzyme loading and 1x108 cells.mL-1 of S. cerevisiae CAT-1, producing 35.1 g.L-1 ethanol in 48 h. Therefore, the results indicated that PEG in high concentrations is an alternative to facilitate the processing of GCH in the cellulosic ethanol industry.

3
  • HELTON GOMES ALVES
  • Influence of polymer concentration in microemulsified systems containing Alkali-Surfactant-Polymer known in sandstone rocks

     
  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • CLÁUDIO REGIS DOS SANTOS LUCAS
  • MARCOS ALLYSON FELIPE RODRIGUES
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • PEDRO TUPÃ PANDAVA AUM
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 30-ago-2021


  • Resumen Espectáculo
  • The Enhaced Oil Recovery (EOR) process using chemical methods, among them, Chemical systems containing Alkali, Surfactant, and Polymer (ASP), has been widely investigated, due to the good synergy between the three chemical agents and for presenting a 20% increase in the percentage of recovered oil in place. In this context, the present work aims at the experimental study of chemical systems, consisting of saponified coconut oil (surfactant), Butan-1-ol (co-surfactant), kerosene (oil phase), Na2CO3 (Alkali), water and different percentages of polymer AH 912 SH, applied as an alternative method in EOR in sandstone rock from the Botucatu sedimentary formation. Chemical systems were characterized by analysis of particle diameter, surface tension and viscosity. Rheology and adsorption tests were carried out in order to evaluate their influence on oil recovery. The flow tests in porous media were carried out in a confinement system that simulates the conditions of an oil reservoir, using sandstone rock plugs with permeability in the range of 15.70 mD to 27.66 mD and oil from the Potiguar Basin of the Ubarana field. The droplet sizes showed characteristic values of micellar aggregates, with a maximum dimension of 2.63 nm. Surface tension increased as the percentage of polymer in the systems increased. Advanced recovery tests using chemical systems showed oil displacement efficiencies with values directly proportional to the increase in viscosity of ASP chemical systems. The system with the highest percentage of polymer obtained the best percentage of oil displaced (79.12%), resulting in greater total displacement efficiency (96.07%). It was also observed that it is possible to obtain satisfactory recovery results by injecting smaller volumes of the system, followed by brine injection. This study showed the potential of ASP microemulsion chemical systems in oil recovery.

     

     

     
     
4
  • VIVIANE HIROMI UCHIDA
  • Use of Castanets (Terminalia catappa Linn) in the production of pectinases and cellulases by Solid State Fermentation (FES) using Aspergilus niger IOC 3998 and use of its bioactive compounds

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCINALDO LEITE DA SILVA
  • NATHALIA SARAIVA RIOS
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 24-sep-2021


  • Resumen Espectáculo
  • Abstract: Castanets (Terminalia catappa Linn) are edible but have no commercial value. In this context, the present study investigated the potential of the castannet fruit for the development of extract with bioactive properties aiming to inhibit the α-amylase enzyme and its use in cosmetics. In addition, the fruit was also used as a substrate for obtaining pectinases and cellulae from solid state fermentation (FES). The pulp extracts showed values of phenolic compounds (2.984mg/g ± 0.38), flavonoids (1.644mg/g ± 0.21), flavonols (0.123mg/g ± 0.001) and total anthocyanins (0.505mg/g ± 0.21) 0.09) and inhibition of α-amylase enzyme reaching 100% with concentrated extract. For the encapsulation by nanoemulsions, using distilled water as the aqueous phase, Crodamol OQ-LQ as the oil phase and Tween 80 as the emulsifier, it was verified the formation of 3 systems with mean diameters 43.2 nm ± 0.6 for the F1. 41.1 nm ± 0.3 for F2 and 68.9 nm ± 0.3 for F3. The best values found in the fermentation process for polygalacturonase and pectin lyases were 32.61 U/g (30°C, pH 8.0 and 80% humidity) and 189.91 U/g (30°C, pH 4.0 and 80% humidity), respectively. In the factorial design, pH contributions and temperature-pH and temperature-humidity interactions were significant for PG. While for PMGL, moisture and temperature-pH interaction were significant. The enzymatic extracts of PG and PMGL were stable at temperatures between 30 and 70°C. However, the extracts were not very stable (40% of relative activity) at different pHs for PG, and for PMGL it remained stable (100 to 70% of relative activity) up to 1h of incubation. The treated residue had the best yield (22%), with CMCase and FPase production of 13.2 U/g and 0.232 U/g respectively. The enzymatic extracts performed better at neutral pH and at temperatures above 50 °C the enzymatic activity decreased to 37.18% and 18.48% respectively.

     

5
  • TIAGO FERNANDES DE OLIVEIRA
  • Niobium and tantalum containing molecular sieves type MCM-41 from columbite ore processing and their application in methylene blue dye adsorption. 

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • CLEONILSON MAFRA BARBOSA
  • MARTA LIGIA PEREIRA DA SILVA
  • MEIRY GLÁUCIA FREIRE RODRIGUES
  • Data: 08-dic-2021


  • Resumen Espectáculo
  • The intense human activity, the population growth and the adverse effects of climate changes have impacted the planet's water supply, especially in the poorest countries. This is mainly due to the lack of rainfall and the contamination of water bodies by organic and inorganic pollutants, such as dye effluents from various industrial activities. Adsorption processes have been shown to be an economically advantageous alternative in the treatment of these wastewater. This work aimed to study the synthesis of MCM-41 type mesoporous molecular sieves modified with the inclusion of niobium and tantalum atoms from the hydrometallurgical processing of columbite ore, varying the molar ratio Si/M = 15, 30 and 60 (M = Nb and Ta). The materials obtained were characterized by XRD, SEM, TEM, FTIR, N2 adsorption and diffuse UV/vis reflectance, and the replacement of silicon atoms in the MCM-41 structure by Nb and Ta atoms was demonstrated, with no prejudice to the characteristic hexagonal ordering of these materials. The molecular sieves were used as adsorbents to remove Methylene Blue dye. The effect of pH, adsorbent dosage and initial dye concentration on removal were evaluated. The adsorption kinetics and the equilibrium isotherm models showed a good fit of the experimental data to the pseudo-second order and Freundlich models, respectively, indicating the heterogeneity in the surface of these adsorbents. Furthermore, thermodynamic parameters indicated a spontaneous endothermic process. The materials obtained proved to be promising adsorbents for MB removal at pH=10, reaching high removal percentages (>99%) even in short contact times


2020
Disertaciones
1
  • RAYANNE MACÊDO ARANHA VIEGAS
  • Treatability studies of creosote contaminated soil applying advanced oxidative process using iron chelate activated persulfate

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • EDSON LUIZ FOLETTO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MARILDA MENDONÇA GUAZZELLI RAMOS VIANNA
  • OSVALDO CHIAVONE FILHO
  • Data: 17-feb-2020


  • Resumen Espectáculo
  • A significant portion of contaminated soil contains organic liquid pollutants known as Non-Aqueous Phase Liquids (NAPLs). Creosote is a type of DNAPL (Dense Non-Aqueous Phase Liquids) and therefore has the ability to migrate to significant subsurface depths until it reaches an impermeable layer where it accumulates. Thus, it may be present at different stages in the underground medium, such as vapor, dissolved and sorbed NAPL (residual and free). It is a complex mixture of organic constituents containing mainly aromatic polycyclic hydrocarbons (HPAs). HPAs are persistent organic pollutants that tend to adsorb into solid particles due to their physicochemical properties. Advanced oxidation processes can be applied to remedy contaminated sites with HPAs through the use of oxidizing agents such as persulfate. This oxidant can be activated by iron ions generating sulfate free radicals () that react with organic species causing partial or complete mineralization. In this work, the partitioning of HPAs contained in creosote between vapor, aqueous, DNAPL and sorbed phases was evaluated. In addition, treatability assays using iron chelate activated persulphate were applied to sandy soils artificially contaminated with creosote and phenanthrene. From the phase distribution evaluation, the highest contaminant concentration was detected in the sorbed phase. Treatability trials performed on creosote contaminated soil showed that 61.4% of the PAHs selected were removed. Phenanthrene (PHE) has been shown to be one of the most recalcitrant HPAs. Thus, treatability tests on phenanthrene contaminated soil were performed and higher removal percentages were obtained and it was possible to reach levels below the intervention value established by the Environmental Company of São Paulo (CETESB) for industrial areas. Kinetic assays indicated that the degradation kinetics of PHE adequately fit a second order model. Based on the results of this study, chemical oxidation proved to be an effective remediation technology for soil contamination by HPAs.

2
  • WILLYAN ARAÚJO DA COSTA
  • Production, Recovery and Application of Oleaginous Bioactivie Obtained from Rhodotorula mucilaginosa cells 

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 19-feb-2020


  • Resumen Espectáculo
  • The present study aimed to obtain lipo-molecules by a bioprocess using Rhodotorula mucilaginosa CCT3892 cells as catalyst and sugarcane molasses as carbon source, evaluated a green extraction process of them using Deep Eutectic Solvents and lastly to obtain nanoemulsioned systems containing these biosubstances in view of a future application in the cosmetic industry. The results obtained in the first part of this work showed that the use of molasse (CM) in the bioactive simultaneous production by the yeast was able to produce the same content of total lipids and total carotenoids (16.50 % ± 0.68% e 0.053 ± 0.001 mg.g-1)  as a synthetic medium (CS) (15.36 ± 1.36 % e 0.051 ± 0.001 mg.g-1). With regards to the fatty acids production, the CM cultivation showed the most prominent profile once it present a great content of oleic acid (74,05%). The yeast extract supplementation (CMEL) did not provide an improvement in microbial oil-production once it redirected the yeast metabolism to others actives instead of secondary metabolites obtainment. In the second part of this research, the use of four choline chloride based Deep Eutectic Solvents was verified in relation to their ability in to improve the yeast cell permeability and total carotenoids recuperation. The best result for the total carotenoid recovery (0.110 ± 0.005 mg.mL-1) was achieved using the solvent synthetized with glycerol (ChGy). The results of the fatty acids analysis showed that DES treatments did not influence in the oil composition. The thermogravimetric analysis of the yeast cells, before and after the treatments, revealed that the solvent interaction with the cells were conditioned to the chemical specie used in DES synthesis. An experimental design (2³) evidenced the process dependence in relation to the temperature, etanol addition in the solvent and extraction time.  In the last part of this research, it was found a strong antioxidant activity for the eutectic extract obtained from the Rhodotorula cells and it was conclude that this characteristic was not only due the carotenoid presence (0.10 ± 0.02 mg.g-1) but also because of the content of reducing sugars, such as: xylose (2.19 ± 0.02 mg.g-1), glucose (1.03 ± 0.00 mg.g-1) and arabinose (0.36 ± 0.00 mg. g-1). After the IC50 determination (10.84 mg.mL-1), the extract was added at 2,5% in an oil phase formed by caprylic/capric triglycerides and preservative. The phase was emulsified with distilled water (aqueous phase) and Tween 20 (surfactant) and the formation of nanoemulsions was noticed, F1 (42.90 ± 8.17 nm) and F2 (118.85 ± 1.44 nm). Both systems were characterized in relation to their pH, zeta potential and polydispersity index (PDI). After the stability tests, the systems showed to be stable in relation to the centrifugal action and variant in kinetic terms according to the storage temperature (30 days). The rheology of the nanoemulsions was also investigated and it revealed that the behavior in ration to a shear stress was conditioned to the oil content, which varied from Newtonian (F1) to non-Newtonian (F2) as a function of the oil phase content. 

3
  • CAROLINA DA SILVA COSTA
  • Development of a pressurized catalytic system for converting γ-butyrolactone into high added value products.

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • CAMILA GAMBINI PEREIRA COURTIAL
  • FRANCISCO WENDELL BEZERRA LOPES
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • PEDRO MIGUEL VIDINHA GOMES
  • TIAGO PINHEIRO BRAGA
  • Data: 20-feb-2020


  • Resumen Espectáculo
  • The unsustainability of the use of fossil materials generates the search for alternative components capable of producing chemical products and energy from clean, renewable and economically viable processes. In the context of chemical product production, biomass is considered a source of platform molecules capable of synthesizing high value-added chemicals. γ-Butyrolactone (GBL), for example, is an important platform molecule for the production of 1,4-butanediol (BDO) and tetrahydrofuran (THF), these substances having several industrial applications. Thus, the present work aimed to study the processes of catalytic hydrogenation of γ-butyrolactone, employing bimetallic nanostructured catalysts based on palladium and rhenium and supported on silica (PdRe/SiO2). The PdRe/SiO2 catalysts were synthesized by the successive impregnation method and characterized in terms of their surface and pore volume, quantity of metals, reduction temperature, crystalline structure and morphology. The reactions were evaluated for the effect of temperature and pressure, from a central rotational composite design, water effect (solvent) and supercritical CO2 (reaction medium). The catalysts were characterized as mesoporous materials with narrow and uniform pores. From the XRD of the catalyst, the Pd peaks were identified in different planes, only a peak of Re and a characteristic peak of amorphous materials referring to silica. TEM images showed agglomerated metal structures, but well distributed on the support. For the reactions, only the linear temperature effect was significant for the GBL conversion, while for the BDO selectivity, the quadratic effects of temperature and pressure were statistically significant. Dimers of BDO and GBL were identified as products of the reactions and water had a great influence on their formations. The effects of CO2-SC were more expressive in increasing the selectivity of THF.

4
  • MARCELO DA SILVA PEDRO
  • Effect of flow patterns on the partitioning of biomolecules (protein and ampicillin) in aqueous two-phase system (ATPS) using microsystems.

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • EVERALDO SILVINO DOS SANTOS
  • JUAN ALBERTO CHAVEZ RUIZ
  • LIANA FRANCO PADILHA
  • Data: 20-feb-2020


  • Resumen Espectáculo
  • Protein separation is a complex process and involves several processing steps, making the process expensive and slow. In this work, a microsystem was built to separate model proteins using the liquid-liquid extraction technique using a two-phase aqueous system (ATPS) of polymer and salt. ATPS was formed by the mixture of the polyethylene glycol-PEG polymer (25% w / w), potassium phosphate (10% w / w) and distilled water (65% w / w). The microsystem channels have diameters of 0.51 mm, 1.14 mm and 1.8 mm. The total flow range ranges from 20 to 700 μL / min. The effect of the flow pattern on the extraction of biomolecules (protein and ampicillin) was investigated. Flow patterns were determined using SAB composed of PEG / phosphate with different molecular molecular weights (PEG 1500, PEG 4000 and PEG 6000) and silicone mini-channels with circular geometry arranged in sinusoidal shape and diameter 1.8 mm. As expected, the gradual increase in liquid flow made it possible to achieve the following flow patterns in sequence: slug, droplet and parallel flow. The high viscosity of the polymeric phases prevented the parallel flow from occurring in systems with higher molecular weight of PEG. Initially, the effect of flow patterns on the recovery of bovine serum albumin protein (from English bovine serum albumin-BSA) was studied for the three flow patterns obtained in the PEG 1500 / dibasic potassium phosphate system in the residence times of 3, 5 and 10 min in the 1.8 mm mini channel. In this condition, the highest BSA recovery efficiencies were 38%, 56% and 32% for 10 min incubation and using slug, droplet and parallel flow patterns, respectively. Then, the recovery of a smaller molecule (ampicillin), whose molar mass is 349 g / mol, was tested for comparison with the BSA protein which has a molar mass of 66500 g / mol (large molecule), with a greater recovery of the smaller molecule. BSA recovery tests were also performed using a 1.14 mm mini-channel and 0.510 mm microchannel using the droplet flow pattern and residence times of 3, 5 and 10 min. The volumetric mass transfer coefficients () were obtained in the range of 0.41-2.75x10-3 (s-1) for all microchannels and flow patterns. The flow regimes affected the BSA recovery, with the droplet regime providing the greatest recovery. The same was not observed for the smaller molecule, antibiotic ampicillin, which recovered independently of the flow regime. The reduction in the diameter of the channels and the increase in residence times had a positive effect on the extraction efficiency and the maximum efficiency value obtained was 69% for the 0.510 mm microchannel and 10 min residence time for the BSA protein. The flow and scale reduction regime had a positive effect for , with higher values being obtained for the droplet and 0.510 mm microchannel regime.

5
  • GUILHERME QUINTELA CALIXTO
  • RENEWABLE PHENOLICS EXTRACT FROM CARBONIZATION OF JUREMA PRETA (Mimosa tenuiflora)

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS
  • Data: 21-feb-2020


  • Resumen Espectáculo
  • Carbonization is a thermochemical process of converting biomass into energy, with neutral CO2 emissions. However, one of the biggest challenges of this process is to make it sustainable, since two products other than charcoal are produced: gas and liquid. The gas, mostly CH4, CO, CO2 and H2, is easy to reuse considering it can be used to heat the system itself. The liquid, also called pyroligneous acid, has high chemical instability due to the complex composition, including toxic organic compounds, and cannot be used immediately after collection or dumped into the environment without prior treatment. This work aims to characterize a distilled fraction obtained from the carbonization of Jurema Preta (Mimosa tenuiflora), and to evaluate its commercial potential according to the results obtained for the valorization of this by-product. Solid biomass was characterized by proximate analysis (moisture, volatiles, ash and fixed carbon content), thermogravimetric analysis (TGA), and analytical pyrolysis coupled to a gas chromatograph (Py-GC/MS) to identify the pyrolysis products in different temperatures. The fractions of pyroligneous extract obtained in the commercial carbonization process in the region of Acari (RN) at 300 and 400 °C were rotoevaporated at 75 °C under vacuum, then extracted with dichloromethane and methanol for further analysis by gas chromatography coupled with a spectrometer mass analysis (GC-MS), and nuclear magnetic resonance (NMR) spectroscopy. The results show that Mimosa tenuiflora's pyroligneous extract is rich in acetic acid and phenolic compounds. The solvents used, dichloromethane and methanol, were able to separate and concentrate a phase rich in phenolic compounds and a phase containing organic acids, respectively. The highest yield of phenolic compounds was reached at a temperature of 300 °C with 70% purity after extraction with dichloromethane. An extract containing approximately 92% acetic acid was obtained at the same temperature of 300 °C after extraction with methanol of the non-dichloromethane-related phase. The extraction method used was efficient in the separation of extracts containing important chemicals for industry and from a renewable origin, obtained from a by-product of the carbonization process, characterizing it as a green product.


6
  • MARCONI FERREIRA DE MEDEIROS
  • Hydrosterification of waste frying oils in supercritical ethanol for biodiesel production.

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • ANDRE LUIS LOPES MORIYAMA
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • Data: 09-mar-2020


  • Resumen Espectáculo
  • The use of frying oils presents important characteristics for any proposal that seeks economic viability and is 
    environmentally friendly to the environment for the production of biodiesel. Economically, the residual oils are
     cheap because they are raw materials of low quality and inexpensive compared to the oils commercialized in 
    Brazil today. Regarding the environmental aspect, studies on the environmental impact of incorrect disposal of 
    discarded oils in the waterof rivers or surface aquifers show that one liter of discarded oil can pollute about 500,000
     liters of water. Another very serious problem of incorrect disposal of waste oils is the inlays in pipelines and pipelines
     of sewage networks in large urban centers. The accumulation of these wastes produces the formation of a biomass
     (solid waste and microorganisms) that causes restrictions and difficulties in the effluent flows to the treatment 
    stations and produce clogging and generation of odors exhaled by the decomposition of this material. These 
    problems cause great economic impacts in the treatment and recovery of these water sources, cleaning, replacement
     and clearing of these public sanitation equipment. In view of these findings, it was proposed the development of a 
    reactive route that could use cheap and low quality raw materials such as residual oils, that would be economically 
    feasible and that would help in reducing the environmental impacts produced by the incorrect disposal of these oils. 
    We performed reactions of frying oils with constant pressure of 100 bar, oil / ethanol molar ratios of 1/10 and 1/30 
    and mass percentages of water of 10%, 20% and 30%, temperatures of 250 ° C, 290 ° C and 310 ° C and residence
     times of 15 min, 30 min and 45 min in continuous flow tubular reactor. The results obtained in these reactions 
    showed conversion rates of total esters (biodiesel) good results, comparable with the literature. The results obtained
     showed that the experiments with higher temperatures (290 ° C and 310 ° C) and residence time (45 min) showed
     yields of 66% and 71% respectively.
7
  • VÁLBER RODRIGO RIBEIRO DE MEDEIROS
  • Kinetic study of the phodegradation reaction of organic matter in domestic sewage using TiO2, Nb2O5 e WO3.

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • ANDREA OLIVEIRA NUNES
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • CARLSON PEREIRA DE SOUZA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • Data: 15-may-2020


  • Resumen Espectáculo
  • The current demand for drinking water faces the ever-decreasing availability of water resources that can be used daily. Therefore, proceeding with the treatment of domestic sewage is an indispensable task, since it enables the reuse of water for various purposes. The high oxidizing power of the •OH radicals generated by the Advanced Oxidative Processes means that these methods have the potential to degrade the organic matter present in effluents. In this sense, this paper proposes the use of heterogeneous solar photocatalysis as an alternative to the conventional secondary treatment given to sewage, thus reducing the generation of sludge and electricity costs. For this purpose, a synthetic sewage solution was fed to a batch photocatalytic reactor, under constant agitation and exposure to sunlight. The tests were performed with TiO2, Nb2O5 and WO3 at concentrations of 0.25; 0.50; 0.75; and 1.0 mg L-1and pH set at 3.0, in a total reaction time of four hours. Aliquots were collected every 40 min and the samples were filtered and analyzed for chemical oxygen demand. The best scenario observed was when in the presence of 1.0 mg L-1 of TiO2, which provided a removal of organic matter of 40.93%. However, removal of the order of 35.56% for Nb2O5at 0.75 mg L-1 shows that this oxide can reach an efficiency like TiO2 even in the lowest concentration in the medium; for higher Nb2O5 values in the solution, the process efficiency declined. With WO3, in turn, the removal of organic matter remained constant from the concentration of 0.50 mg L-1, reaching a peak of 30.87% when at 1.0 mg L-1. Regarding the reaction kinetic study, the predominance of second order kinetics was observed when working with Nb2O5 and TiO2, whereas first order kinetics prevailed when using WO3.

8
  • JOÃO GABRIEL BEZERRA COSTA
  • Active carbon from textile waste: synthesis, characterization and application reactive dye removal from a synthetic wastewater. 

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • ANDREA OLIVEIRA NUNES
  • FRANCISCO WENDELL BEZERRA LOPES
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • Data: 05-jun-2020


  • Resumen Espectáculo
  • The textile industry demands an enormous amount of water resources, thence generates large volumes of wastewater with a high polluting potential. Among these contaminants, textile dyes, since they give color to recipient bodies, appear to have a distinctive role in the environmental approach. Regarding this, the present work proposes a cyclical reuse of the solid textile waste, whose usual destinations point to low added value products, for the synthesis of activated carbon and removal of dyes from textile wastewater. Therefore, 100% cotton fibers (RFA), which are the main natural matrix of the textile industry, were used. The RFA was impregnated with H3PO4 and pyrolyzed in a vertical tubular oven at a rate of 5 °C/min and remained for 3 h at 500 ° C under N2(g) flow, obtaining the activated carbon (CAT). A commercial activated carbon (CAC) was used as a direct comparison parameter. Novacron Red S-B was used as adsorbate for fitting in categories that are highly used in that sector. The RFA showed low fixed carbon content (Cfixo = 2.98%), semicrystalline structure (IC = 77.88%) of type Iα cellulose and flat twisted ribbon morphology with no pores on its surface. On the other hand, RFA+H3PO4 showed an increase in its stability and carbon availability for the synthesis of activated carbon by the appearance of phosphate bridges that promoted crosslinking of cellulose chains, resulting in a satisfactory pyrolysis yield (ηpir = 60,145 %). CAT and CAC coals showed irregular morphologies, amorphous structures and close isoelectric points (pHiso = 2.62 and 2.29, respectively), with CAT showing better textural properties (SBET=1096 m2/g; VTP = 0.81 cm3/g; dPm = 1.5) when compared to CAC and similar to others reported in the literature. The adsorption tests reached a maximum removal of 75.41% and 65.36% for CAT and CAC, respectively, in 12 h. Both systems fitted better to pseudo-second order kinetic model (R2CAT = 0.99518 and R2CAC = 0.99746) with k2,CAT = 2194.16336 g/mg*min and k2,CAC = 2194.16336 g/mg*min. The equilibrium isotherm data denoted a physical and favorable adsorption process with maximum adsorption capacities of qmax,CAT = 131.23844 mg/g and qmax,CAC = 58.91475 mg/g. A better fit was obtained for the Freundlich model for CAT (R2 = 0.9908) and for Langmuir for CAC (R2 = 0.999917), indicating heterogeneous and homogeneous adsorptions sites, respectively. Therefore, these results suggest the viability of those residues as carbon sources for activated carbon production and its suitability for dye removal. 

9
  • THALITA MARREIRO DELMIRO
  • Potential of Monoraphidium sp. produced in outdoor crops to obtain third generation biofuels

  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • RODRIGO CESAR SANTIAGO
  • Data: 22-jun-2020


  • Resumen Espectáculo
  • Microalgae are promising biomasses for obtaining third generation (3G) biofuels, because in addition to accumulating large amounts of lipids that can be converted into biodiesel from transesterification, their residual biomass can be used in other conversion processes. In addition, they have rapid growth, do not compete with food sources, and can be grown on a large scale in outdoor cultivation systems. Therefore, the present work aims to evaluate the potential for the generation of 3G biofuels from microalgae of the species Monoraphidium sp., Obtained from intensive outdoor cultivations, through the characterization of the lipid extract and its conversion through the pyrolysis process. For this, the biomasses were characterized in terms of dry matter, ash, protein, lipids and carbohydrates content and also through thermogravimetric analysis (TGA / DTG), spectroscopy in the middle and near infrared (FT-IR) region (FT-NIR ). The ash characterization was carried out through X-ray fluorescence (FRX) and X-ray diffraction (DRX). The lipid extract, obtained by the Schmid-Bondzynski-Ratzlaff method, was evaluated by thin layer chromatography (CCD) and gas chromatography coupled to a mass spectrometer (GC-MS). The preliminary characterization results reveal biomasses with high protein content (20.05 - 34.81%), carbohydrates (25.01% -54.46%) and ash (13.02 - 33.29%). In relation to TL, the results varied between 8 - 22%. The lipid extracts have a fatty acid profile rich in C16: 0, C16: 4 ω-3, C18: 2 ω-6, C18: 3 ω-3 and C18: 4 ω-3, and the presence of triglycerides and fatty acids determined by thin layer chromatography (TLC). Catalytic flash pyrolysis (Py-GC / MS) of biomass was also performed before and after extraction, and of lipid extract, using zeolite HZSM-5 as a catalyst, which provided an improvement in the characteristics of the products generated in relation to conventional pyrolysis. , promoting the increase in the formation of renewable aromatic hydrocarbons in the three cases. For the lipid extract the formation of 16, 38% of alkanes in the range of C8 to C12, indicates its capacity for the generation of renewable hydrocarbons such as biogasoline and aviation biokerosene (BioQAV). It is concluded with these results that Monoraphidium sp. presents energy potential for the production of 3G biofuels, either through the conversion of oil into biodiesel or the production of renewable fuels from catalytic pyrolysis.

10
  • MATHEUS VERÍSSIMO RODRIGUES
  •  Synthesis and characterization of mixed copper and nickel ferrites using the combined EDTA/Citrate complexation method.
  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • MAYARA FELICIANO GOMES
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • YARA FELICIANO GOMES
  • Data: 30-jun-2020


  • Resumen Espectáculo
  • This paper consists in the synthesis and characterization steps in order to obtain a mixed nickel and copper ferrite (NixCu1-xFe2O4), in which the nickel’s presence varies from 0 to 100%, with gaps of 20% between each sample. As a synthesis route, complexation by EDTA and citric acid as chelating agents was the chosen method. Once the process began with the EDTA dissolving by ammonium hydroxide, hydrated iron III, copper II, and nickel II nitrates, at stoichiometric proportions, were added. Then citric acid was added to the mixture, with the intent that the proportion between EDTA, citric acid and the metallic cations corresponded to  1:1.5:1, and that was heated to 80 ºC. Succeeding the formation of a gel, the precursors were taken to the muffle at 230 ºC for three hours and, afterwards, incinerated for four hours at three different temperatures, 500 ºC, 600 ºC e 700º C, creating distinct samples. X-ray diffraction (XRD) analysis was performed on the samples following two procedures, one slower and one faster, aiming to obtain the crystalline structure profile and to compare than with models from the Xpert software and, then, refined on GSAS/EXPGUI. Two different scanning electron microscopy methods (SEM) were utilized, for two distinct magnification spectra: a desktop device and one with a field emission gun (FEG), attached to a energy dispersive spectroscopy (EDS). In both situations, imagens containing the synthetized ceramics were obtained and, aided by the EDS, it was possible to analyze the ratio between each ferrite’s atomic components. As a result from the XRD analyses and refinement, it was possible to notice that the peaks present better definition at higher incineration temperatures, correspondence to the materials’ cards found on X’Pert and the absence of multiple phases on the final products. Regarding the microscopies, the desktop device provided images with low resolution, because the synthetized materials has smaller dimensions than those of the method’s limitations. The SEM-FEG, on the other hand, allowed a better visualization of the particles, whose size is nanometric and forms, in some cases, an octahedra structure. In order to evaluate the obtained solids, this paper recommends further characterization application studies.

11
  • EDUARDO WAGNER VASCONCELOS DE ANDRADE
  • Osmoporation of fisetin into probiotic bacteria cells (Lactobacillus acidophilus): process parameters, bioaccessibility and incorporation into dairy beverage.

  • Líder : ROBERTA TARGINO HOSKIN
  • MIEMBROS DE LA BANCA :
  • ANDREA FARIAS DE ALMEIDA
  • ANTONIO DE ANCHIETA CAMARA JUNIOR
  • DANIELLA REGINA ARANTES MARTINS SALHA
  • LOURENA MAFRA VERISSIMO
  • MARCIA REGINA DA SILVA PEDRINI
  • ROBERTA TARGINO HOSKIN
  • Data: 06-ago-2020


  • Resumen Espectáculo
  • This study investigates the encapsulation of hydrophobic fisetin into probiotic Lactobacillus acidophilus bacteria cells. Initially, the influence of selected process parameters (fisetin concentration and osmotic pressure) on the encapsulation efficiency was evaluated. Furthermore, the structural characterization (determined by FT-IR and DSC techniques), bioaccessibility of the biocapsules, as well as the acidifying activity performance of L. acidophilus in a dairy beverage (model food) were investigated. Results show that the highest encapsulation efficiency (28%) was achieved at fisetin concentration of 2 mg.ml-1 and osmotic pressure 15 MPa. Additionally, differential exploratory calorimetry curves (DSC) demonstrated an effective fisetin internalization into cell cytoplasm and its adsorption onto cell surface. The in vitro gastrointestinal simulation showed that the bioaccessibility of encapsulated fisetin was 45.9%, while free fisetin reached only 0.7%. When fisetin biocapsules were added to milk, the fisetin content released during milk fermentation substantially increased the antioxidant activity of the final fermented beverage (95.3%) for 14 days and the encapsulated fisetin content remained high (85%) for 28 days. Overall, the results prove that fisetin osmoporation into L. acidophilus cells is a simple and efficient technique that enables phytoactive protection for food industry applications

12
  • GUSTAVO HENRIQUE LOUREDO
  • Photocatalic Production of Hydrogen in Continuous-flow Plate Reactor using Nickel Ferrite as Photocatalist  

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • ANDARAIR GOMES DOS SANTOS
  • FRANCISCO WENDELL BEZERRA LOPES
  • YARA FELICIANO GOMES
  • Data: 14-ago-2020


  • Resumen Espectáculo
  • The search for new sustainable energy sources that are renewable, environmentally friendly, economically profitable and with a high capacity for regeneration in the environment with the aim of initially reduce and subsequently eliminate the energy dependency of fossil fuels, has promoted studies on the viability of solar hydrogen production with high conversion rates, safely and economically feasible for large-scale application. Among the multiplicity of options for its production, heterogeneous solar photocatalysis involving the breakdown of water molecules has been a promising area in this context, presenting challenges related to the synthesis of photocatalysts with high conversion rates of luminous energy into hydrogen, durable and with low cost of production. In this prism, this work intends to produce nickel ferrite (NiFe2O4) by the co-precipitation synthesis method to act as a photocatalyst, in which the influence of the reagents concentration and the heating rate, temperature and time of the plateau in the calcination will be evaluated. In addition, a photoreactor will be produced to conduct the reactions under solar radiation, in which parameters such as low cost of production and scalability will be prioritized, once in operation the phenomenon of mass transfer of water to the surface of the photocatalyst in the process and the influence of the water flow rate on the hydrogen production rate will be studied together with the evaluation of the reuse and regeneration capacity of the semiconductor. The materials studied will be characterized by thermogravimetric analysis (TG) and differential thermal analysis (DTA), atomic force microscopy (AFM), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy, diffuse reflectance spectroscopy (DRE) and Specific Area Analysis by the nitrogen adsorption method (BET).    

13
  • ALLAN MIGUEL FRANCO DE AMORIM
  • Synthesis and Characterization of Copper Oxides Nano-wires produced by Term Oxidation

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • MAYARA FELICIANO GOMES
  • YARA FELICIANO GOMES
  • Data: 28-ago-2020


  • Resumen Espectáculo
  • This work investigated the formation of copper oxide nanowires through the oxidation process of metallic copper sheets and how the synthesis conditions influence the concentration and structure of the oxides. For that, X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterizations were performed. The nanowire synthesis process was first evaluated in the treatment of metallic copper sheets before the oxidation process and then in the thermal process performed in atmospheric environment. Two treatment procedures were investigated, namely: immersion in chloridric acid solution followed by immersion in ethanol in ultrasound; and immersion in acetone followed by immersion in isopropyl alcohol in ultrasound. After selecting the best pre-treatment, the thermal process was evaluated through a 33 factorial experimental design using as parameters: the temperature (400-700 °C), the heating rate up to the threshold temperature (5-15 ° C/min) and process duration (3-9 hours). The samples were analyzed for the presence of nanowire structures and its diameters. Crystalline structures were identified as oxide copper I and II (CuO and Cu2O) in addition to metallic copper in all tests performed, which were evaluated in terms of its proportion compared to the different thermal regimes tested. It is concluded that the treatment with hydrochloric acid solution and ethanol is effective in promoting a porous medium on the metal surface that improves the number of active sites for the oxidation of copper ions and, consequently, promotes a more uniform growth of the oxides. In addition, the analysis of variance (ANOVA) for the factorial design tests 33 indicated, with a 95% reliability level, that the temperature and the heating rate had an influence on the concentration and the average diameter of the nanostructures obtained.
14
  • CLAUDIA BEZERRA SILVA
  • Biodiesel production using surfactant and chicken eggshell

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • FRANCISCO WENDELL BEZERRA LOPES
  • Data: 13-nov-2020


  • Resumen Espectáculo
  • Biodiesel is considered an alternative source of fuel, that consists of fatty acid alkyl ester. Industrially, transesterification is the route most used to produce it, that is a chemical reaction between triglycerides and alcohol, with a homogeneous or heterogeneous catalyst. Surfactants are substances that have at least two parts, one hydrophilic, and the other hydrophobic, and are characterized by their tendency to absorb surfaces and interfaces. Thus, this work aims to evaluate the use of surfactant Nonylphenol ethoxylated in a transesterification reaction of soybean oil with methanol, catalyzed by the calcium oxide (CaO) synthesized from chicken eggshell. Two experimental factorial design were performed, both with the addition of three central points. In the first one, 22, it was evaluated the ethoxylation number and the surfactant concentration. In the second one, 23, with 1% of Nonylphenol with 7 moles ethoxylated (NP7EO), it was evaluated the reaction time, catalyt concentration and methanol to oil molar ratio. Moreover, two different types of study were performed, one with NP7EO, and in the other NP7EO was not used, their kinetic constants were compared. The ethoxylation number and its concentration did not influence significantly in the biodiesel conversion. In the factorial design 23, the predicted model using 1% de NP7EO was significant in the biodiesel conversion, the maximum was 98,95%, with 5% of CaO, methanol to oil molar ratio of 7/1, 65 ° C, 3 hours reaction. In the study with and without NP7EO, the kinetic constants, 0,012 min-1 and 0,0089 min-1, were obtained, respectively, and the reactions were shown to be pseudo-first order. Furthermore, the results have shown higher conversions in the reactions with NP7EO. Thus, the surfactant influenced better biodiesel conversions and improved the transesterification reaction rate, incrising its velocity. Probably due to its ability to improve the dispersion between the phases of the mixture reagents.

Tesis
1
  • PAULA ROMYNE DE MORAIS CAVALCANTE NEITZKE
  • Flotability of hematite and quartz with amine and starch dosed in microemulsions and nanoemulsions

  • Líder : AFONSO AVELINO DANTAS NETO
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ANTONIO EDUARDO CLARK PERES
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • RICARDO PAULO FONSECA MELO
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 07-feb-2020


  • Resumen Espectáculo
  • The proper use of low-grade iron ore and its wastes is imperative to obtain a reasonable development for sustainable industrial growth. Reverse cationic flotation is an effective process when used in iron ore beneficiation. In this process, quartz, which is the main gangue mineral, is floated with cationic collectors (amines). Starch is usually used in iron oxide depression. Surfactant adsorption at the liquid / air and solid / liquid interfaces plays an important role in many technological and industrial applications such as emulsification, mineral flotation, and solid dispersion. In this work quartz and hematite microflotation was performed using microemulsion and nanoemulsion systems. Microemulsion and nanoemulsions systems were composed by: surfactant (Flotigam EDAâ or Ultramine 150â), co-surfactant (n-butyl alcohol), oil phase (kerosene), and aqueous phase or depressant solutions (Maizenaâ, soluble starch, amylose, or amidex). The influence of operational parameters such as concentration and type of surfactant, concentration and type of depressant, and pH were evaluated. The results show that the performance of nanoemulsions is superior to that of microemulsions, as well as the use of monoamine alkyl ether solutions (conventional method). Maizenaâ, soluble starch, amidex, and amylose depressants in nanoemulsified systems containing Flotigam EDAâ, kerosene, and n-butyl alcohol showed high floatability for quartz even at the highest concentrations of depressors tested and were able to depress hematite, showing no evidence for clathrate formation. Nanoemulsions with Ultramine 150â nonionic surfactant reached the maximum floatability percentages for quartz (99.16%) and optimal hematite depression (89.10%). These results show that the use of nanoemulsions in the reverse flotation process has potential application in iron ore concentration, simplifying and leading to an improvement of the conventional stepwise process.

2
  • TYCIANNE JANYNNE DE OLIVEIRA CABRAL
  • Optimization of the extraction and molecular distillation of Patchouli oil. 

  • Líder : AFONSO AVELINO DANTAS NETO
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • TEREZA NEUMA DE CASTRO DANTAS
  • IZABELLY LARISSA LUCENA
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • MONICA RODRIGUES DE OLIVEIRA
  • Data: 14-feb-2020


  • Resumen Espectáculo
  • One of the biggest difficulties in working with raw materials and inputs from natural sources is meeting the purification standards. In this sense, the study of the extraction and distillation of the essential oil of patchouli was performed, to improve its quality without causing the degradation of its components. First, a comparative study was conducted between the Pogostemon Cablin and Pogostemon Heyneanus species, cultivated in the Brazilian Northeast, through parameter analysis using the hydrodistillation process. The parameters studied were extraction time, volum and pH of the solvent and part of the plant The extraction yield from leaves of P. Cablin was 4.45 times higher than P. Heyneanus. The optimum conditions for extraction from P. Cablin species were: extraction time 180 min, solvent volum 700 mL and extraction from leaves. For P. Heyneanus species, extraction time of 150 min, extraction volume of 700 mL and extraction from leaves were the optimal extraction conditions. Chromatographic analyzes revealed that extracts in neutral, acid and basic medium from P. Cablin showed patchoulol percentages of 60.45%, 7.10%, and 61.05%, respectively. While for P. Heyneanus species, the percentages of patchoulol were 14.72%, 13.79% and 36.06%, respectively. In the study of extraction kinetics, two kinetic models (pseudo first order and non-stationary diffusion) were applied to adjust the experimental data. The variation of two parameters (solute/solvent ratio and heating power) were analyzed on the kinetics. The results showed that the non-stationary diffusion model best described the patchouli essential oil hydrodistillation process. The highest amount of essential oil was obtained at a ratio of 1:23 solute/solvent (g.mL-1) and a heating power of 470 W. After optimization of the extraction process, molecular distillation of the oil was performed to obtain fractions. rich in patchoulol using Response Surface Methodology (RSM) and Artificial Neural Network (ANN). Three variables were studied: evaporator temperature, condenser temperature and agitation speed. The optimal conditions obtained by the experimental design were: evaporation temperature of 85 °C, condenser temperature of 10 °C and agitation speed of 600 RPM. These conditions generated a concentration of 62.344% of patchoulol in the residue, reaching a recovery of 74.22%. The results obtained by ANN have demonstrated good predictability and can be used in conjunction with RSM for modeling the patchoulol enrichment process. The study of the influence of temperature and percentage of patchoulol on the oil viscosity was carried out for the residual streams. It was observed that percentage of patchoulol is one of the factors that influences the viscosity of the samples. The study showed great relevance with possible industrial application, because it promoted the concentration of patchouli oil in patchoulol.

3
  • VIVIAN MARIA DE ARRUDA MAGALHÃES
  • Treatability studies using clay-based catalyst in advanced oxidation process for remediation of PAHs contaminated soil.

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS NOVAIS MOTA
  • DOUGLAS DO NASCIMENTO SILVA
  • ITALLA MEDEIROS BEZERRA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • MARILDA MENDONÇA GUAZZELLI RAMOS VIANNA
  • OSVALDO CHIAVONE FILHO
  • Data: 17-feb-2020


  • Resumen Espectáculo
  • The remediation of contaminated areas with polycyclic aromatic hydrocarbons (PAHs), which are persistent organic pollutants and have varied toxicity, becomes a great challenge due to the complexity of the soil and the pollutants. Several strategies for contaminated soils remediation with PAHs have been proposed with different degrees of success, among them is the advanced oxidative process. Different oxidants with varied activation forms for radical generation have been investigated. The oxidant activation can occur by homogeneous process, with iron as the most commonly agent, or heterogeneous, with solid catalysts supporting an active phase, for example. The effectiveness of the remediation technique is predicted by laboratory treatability studies. Thus, the present work evaluated the chemical oxidation of PAHs in artificially contaminated soil aiming an in-situ application. Hydrogen peroxide or sodium persulfate processes with activation by homogeneous reaction using iron sulfate and pH adjustment or heterogeneous reaction using solid catalyst were evaluated. Solid catalyst synthesis was developed employing iron ions as active phase supported on clay. The experiments were optimized applying an experimental design technique to appraise concentrations that would provide better contaminant removal efficiency. Kinetic studies and distribution evaluation of each contaminant in different phases were performed. The oxidation process employing the clay-based catalyst provided 80% removal of phenanthrene and 94% removal of naphthalene, with reproducible assays. Although homogeneous processes have slightly higher removals compared to heterogeneous processes under the applied conditions, the amount of iron required in the heterogeneous reaction was lower and the non-adjustment pH are significant advantages related to cost reduction and environmental caution. PAHs selected as creosote representants have greater affinity with the solid phase, observed in partitioning evaluation tests. In addition, a difference between the initial amount of contamination, from a freshly contaminated dry soil, and the amount determined at the end of the tests was observed, most likely due to sorption and water interference in extraction, for example. 96% of contaminants removal was achieved in oxidation assays of creosote contaminated soil. The removal was related to degradation and sorption processes, both in soil and in clay-based catalyst.

4
  • FERNANDO JOSÉ VIEIRA DA CUNHA FILHO
  • The role of the optimized excess of H2O2 in the rapid mineralization rate of the drugs Acetyl Salicylic Acid (AAS) and Hydrochlorothiazide (HCT) via the photo-Fenton process

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS NOVAIS MOTA
  • ANDRESSA BASTOS DA MOTA LIMA
  • DANNIELLE JANAINNE DA SILVA
  • DOUGLAS DO NASCIMENTO SILVA
  • EDSON LUIZ FOLETTO
  • OSVALDO CHIAVONE FILHO
  • Data: 18-feb-2020


  • Resumen Espectáculo
  • Studies of drugs as emerging pollutants have been gaining importance in the scientific community. Acetylsalicylic acid (AAS) is a model pollutant and a representative of emerging pharmaceutical micropollutants whose mineralization through various advanced oxidative processes (POAs) takes hours to complete. Hydrochlorothiazide (HCT) has been found in final waters for consumption due to its persistence. This work is dedicated to optimize and understand the kinetic conditions to mineralize AAS and HCT using the Foto-Fenton process with UVA radiation in a tubular photochemical reactor and mixing reactor, respectively. The optimization employs a statistical factor planning tool that studies how the concentrations of the pharmaceutical contaminant, Fe2 + and H2O2 affect mineralization over a range of concentrations. The factorial design indicates that the initial concentration of H2O2 is a crucial variable to achieve a rapid rate of AAS and HCT mineralization. Using optimized content of H2O2 and Fe2 + in the photo-Fenton process (H2O2 / Fe2 + / UVA and H2O2 / Fe2 + / UVC, respectively), a mineralization of more than 90% for AAS and 100% for HCT is achieved in about 10 minutes and 30 minutes, respectively. The underlying reason for such remarkable performance is attributed to the optimized excess of [H2O2], which varies according to the contaminant, that is, the H2O2 concentration ratio used in the initial time for the required complete mineralization of the theoretical TOC. Measurements of the remaining H2O2 concentration strongly indicate that the excess of [H2O2] optimizes the instantaneous concentration of the radical • OH. Among the applied POA's, the comparison of UV-H2O2 oxidation (H2O2 / UVA and H2O2 / UVC) with photo-Fenton oxidation (H2O2 / Fe2 + / UVA and H2O2 / Fe2 + / UVC) stands out. When using the optimized peroxide in the first composition, almost 100% degradation of AAS and HCT was obtained, but in this case, there was no good mineralization. To obtain a high degree of mineralization, close to 100% it was crucial to add Fe2 + together with the aid of light. In addition, a toxicology study was conducted with HCT. HCT has been shown to be toxic at certain concentrations for the Mysidaceas group. The LC50 of 37.25 mg.L-1 of HCT was determined. The POA’s were applied to determine the possibility of generating their own means for the survival of the Mysidaceas. It was obtained that among the POA’s, as only the photo-Fenton (H2O2 / Fe2 + / UVC) was able to mineralize the HCT, it was the only POA to make the medium no more toxic. This fact corroborates with results of the total non-mineralization of the other applied POA's, comparing that in these cases there was the formation of toxic intermediates. And the only really efficient process for HCT was photo-Fenton (H2O2 / Fe2 + / UVC). In conclusion, the stoichiometric excess of [H2O2], is the most important parameter to be optimized in order to achieve the highest degree of mineralization in the shortest time of use of the photochemical reactor, also decreasing the costs related to the total energy consumed by both the lamp and pumping.

5
  • BRUNO CASTRO BARBALHO
  • XXXXXXXXX

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS CALADO ARAUJO
  • ANDRE LUIS LOPES MORIYAMA
  • ANDRE LUIS SANTOS DE PINHO
  • ARISTIDES FELIPE SANTIAGO JUNIOR
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • Data: 02-mar-2020


  • Resumen Espectáculo
  • XXXXXXXXXXX

6
  • PAULA FABIANE PINHEIRO DO NASCIMENTO
  • STUDY OF METHODOLOGIES FOR TREATMENT OF COCONUT HAND DUST FOR Cu² and Cd² ADSORPTION

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • JOAO FERNANDES DE SOUSA
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • ALFREDO JOSÉ FERREIRA DA SILVA
  • FRANCISCO WENDELL BEZERRA LOPES
  • ROSANGELA DALA POSSA
  • Data: 04-ago-2020


  • Resumen Espectáculo
  • In view of the environmental problem of the pollution of water bodies by heavy metals, caused by human activities in general, and the inadequate destination of certain solid agro-industrial residues, there is a great need to develop research that improves the technique of removing these inorganic pollutants from aqueous solutions. One way would be to take advantage of agro-industrial waste as agents that remove these pollutants. As the coconut shell powder (CP) is a residue generated from its processing, the present work aims to provide studies related to three treatment methodologies so that the CP adsorption capacity be empowered and then be reused to remove two toxic metals widely found in wastewater, Cu+ 2  and Cd+ 2 that are widely found in wastewater from effluents from the mining, metallurgy and dye industries. The applied methodologies included the physical and chemical treatment of the PC surface, developed separately, according to the sequence: chemical treatment through the impregnation of Monoethanolamine in the proportion 1: 1, using ethanol as solvent; chemical treatment through the impregnation of the sodium octanoate surfactant by microemulsion; and physical modification using the steam explosion technique (T = 210 °C and P = 20 atm). The efficiency of the proposed treatments was evaluated through characterization analyzes, where changes were observed in the specific contact area, chemical composition and crystallinity of the adsorbent material. The evaluation of the monocomponent adsorption capacity of Cu+2 and Cd +2 ions in the PC was performed using a batch mixing reactor of the synthetic solutions of CuSO4.5H2O and CdSO4.8 / 3H2O. After chemical treatment, the insertion of functional groups increased the metal - adsorbent interaction confirmed by the values of the kinetic constants of the studied models. It was observed that the coconut shell powder impregnated with OS (PCµE) adsorbed more Cu + 2 ions in relation to the impregnated with MEA (PCA). The treatment with steam explosion, depolymerized the coconut shell powder (PCD), which caused an increase in the total pore volume and crystallinity, consequently, making the adsorbent surface more accessible for adsorption. The behavior of equilibrium isotherms is satisfactorily represented by the Langmuir model and the adsorption capacities (mg / g) of the coconut shell powder after treatments follow the order: PCµE (26.32)> PCD (18.86)> PCA (15.94)> PC (7.88) for Cu+2 and PCD ions (17.90)> PCA (14.02)> PC (4.91) for Cd+2 ions, respectively, emphasizing that the impregnation methodology with surfactants did not significantly improve the interaction of PC with Cd+2. The stability of the impregnation with MEA and OS was evaluated from the desorption study. After the adsorption-desorption cycles, the amount of Cu+2 adsorbed on the PCµE decreased by 36.6%, while for the PCA the reduction was 22.8%. Regarding the adsorption of Cd+2, a reduction of 14% and 10% was observed for PCµE and PCA, respectively. This shows that, after the five adsorption-desorption cycles, the impregnation of monoethanolamine in the coconut shell powder is stronger, remaining with greater removal than the PCµE and thus, it can be reused for more cycles in the adsorption-desorption process.

7
  • IARA MICHELLE SILVA CORREIA
  • Adsorptive desulfurization of fuels using ZSM-35 impregnated with molybdenum. Doctoral Thesis, UFRN, Posgraduate Program in Chemical Engineering, Natal –RN.

     

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLSON PEREIRA DE SOUZA
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • ANDARAIR GOMES DOS SANTOS
  • FRANCISCO WENDELL BEZERRA LOPES
  • MARCELO JOSE BARROS DE SOUZA
  • Data: 23-sep-2020


  • Resumen Espectáculo
  • The search for cleaner technologies for the removal of sulfur compounds in fuels is a constant, since the commercial desulphurization process currently used is characterized by high hydrogen consumption and severe temperature and pressure operating conditions, in addition to not meeting the future demands of environmental legislation. In this work it was evaluated the use of zeolite ZSM-35 modified with molybdenum in different concentrations (2.5%, 5%, 10% w / w) applied in an adsorptive desulfurization process at low temperature and pressure. The materials were prepared by wet impregnation and characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), thermal analysis (TG / DTG) and scanning electron microscopy (SEM). The adsorptive desulfurization was carried out in a batch system at temperatures ranging from 30 ° C to 50 ° C under a stirring speed of 140 rpm using a model fuel containing 800 ppm of sulfur. The sulfur contained in the samples was quantified according to the ASTM D5443 standard. The adsorption kinetics was evaluated by the kinetic models of pseudo-first order, pseudo-second order, intraparticle diffusion and Elovich. The results showed that the adsorbents obtained had their structures little affected by the metallic impregnation process and that the thermal stability of the adsorbents was affected by the concentration of molybdenum in the structure, with the lowest mass loss observed being 10.1% (sample 2,5MZ35). In the adsorption desulfurization process for the evaluated systems, the yield varied from 10.03% (2.5% Mo at 30 ° C) to 21.41% (10% Mo at 50 ° C) and that the capacity of adsorption was influenced by temperature and metal concentration in the zeolitic structure. The adsorption experimental data, in general, they were better adjusted to the pseudo-second order kinetic model. The adsorbents obtained showed a good potential for application in desulphurization processes of fuels by adsorption.

8
  • CINTHIA MEIRELLY DE ARAÚJO ELPÍDIO
  • Drying of the plum by the foam mat method: optimization of parameters and product characterization.

  • Líder : MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • MIEMBROS DE LA BANCA :
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • JACKSON ARAUJO DE OLIVEIRA
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • KATIA CRISTINA BORGES
  • JOSILENE DE ASSIS CAVALCANTE
  • MARCELLO MAIA DE ALMEIDA
  • Data: 12-dic-2020


  • Resumen Espectáculo
  • Plum is a seasonal fruit with low durability after harvest, requiring the application of techniques that prolong the shelflife of this food. Among the methods that can be applied is the drying in foam mat that consists of the transformation of liquids or semi-liquids into a stable foam from the addition of a foaming agent and application of agitation so that there is the incorporation of air. In this work, the plum foam was produced from the addition of egg albumin and the drying was carried out in an air recirculation oven with a speed of 2 m / s. The study of the drying of the plum in a foam layer was divided into stages, the first part of which is the investigation of the effects of the process variables, whipping time and albumin concentration, on the physical, thermal properties and drying time in order to optimize the operational conditions for the production of plum foam, whose values found were 3% albumin concentration and 12 minutes of whipping time. In the next step, the influence of temperature and foam mat thickness on the moisture, water activity and drying time of the plum foam was evaluated in order to define the best operational condition for drying this fruit, being observed that the higher temperature and less foam mat thickness are more suitable for the process, since they provided the best results for powder moisture (2.690 g water / g dry powder), water activity (0.245), drying time ( 70 minutes) and average drying rate (0.0631 g water / g dry powder / min). The last phase of this work investigated the influence of temperature on the physical-chemical properties, bioactive compounds and antioxidant activity and performed a comparison of the powders obtained by foam mat at four temperatures with the powder obtained by freeze drying, since the latter is widely used. known as the method capable of preserving the original characteristics of the fruit. The experiments were carried out using the foam in the previously optimized process condition (3% egg albumin in the formulation, 12 minutes of whipping and 0.8 cm layer thickness) and four drying temperatures: 50, 60, 70 and 80 ° C. For lyophilization, about 280 grams of pure plum pulp was used, without the addition of egg albumin (it was not foamed). The analysis of the produced powders showed that the higher temperature (80 ° C) provided a product with low cohesion between the particles (1.153) and good fluidity (13.235), in addition to low absolute density (0.637 g / cm³), important characteristics for particulate materials. All powders showed good solubility in the range of 75.737 and 76.842 g / 100 g and low water activity (0.245 to 0.386). The phenolic compounds were not impacted by the process conditions, the antioxidant activity was favored by the temperature, but the amount of ascorbic acid and carotenoids was greatly reduced by the action of this variable. Based on the results and because the lyophilization process is costly, the condition that provided the best results for both the drying process and the quality of the plum powder was the temperature of 80 ° C.

2019
Disertaciones
1
  • LARISSA PINHEIRO DE SOUZA
  • 2,4,6-trichlorophenol degradation by means of a zero-valent-copper reductive process, coupled to UV / H2O2 oxidation. 

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CÁTIA ALEXANDRA LEÇA GRAÇA
  • OSVALDO CHIAVONE FILHO
  • VITOR JORGE PAIS VILAR
  • Data: 18-ene-2019


  • Resumen Espectáculo
  • During the disinfection stage of water treatment, the combination of the remaining organic matter with free chlorine can lead to the generation of organochlorine compounds. Among these is 2,4,6-trichlorophenol (TCP), with high environmental persistence and carcinogenic character, which is included in the priority list of the United States Environmental Protection Agency – USEPA. Despite drinking water usually containing low concentrations of this compound (ng L-1), its bioaccumulative effect may cause long-term health problems, which alerts to the need of TCP-contaminated water remediation. Advanced Oxidative Processes (AOPs) have been successfully applied in the removal of many persistent pollutants, although in the case of organochlorines, due to their deficient electron groups (halogens) and consequent oxidation resistance, AOPs effectiveness may drop. However, this can be surpassed by combining a pre-reductive step before oxidation, thus facilitating organochlorines degradation. Therefore, the present work proposes a system that couples a reductive process mediated by zero-valent-copper with an oxidation process mediated by hydroxyl radicals (OH). A preliminary study was undertaken to evaluate the influence of different reaction variables and system conformation: batch and recycling packed-column systems. In the latter, different reactive materials were tested, among them copper wires obtained from electronic waste, as well as different metal and contaminant concentrations, through statistical experimental design. From this study, the best reductive degradation conditions were obtained. Then, the degradation of TCP was performed by an advanced oxidation process (UV / H2O2), in order to compare with the first step. In this one, the influence of the oxidant concentration (H2O2) was evaluated, in order to adopt the most suitable for subsequent coupling with the reductive step. Finally, the combination of both processes was performed, by submitting the solutions that were previously reduced to the UV/H2O2 process. In both steps two aqueous matrices were tested (deionized and tap water). Toxicity assays with Vibrio fischeri luminescent bacteria were also carried out, in order to evaluate the processes effectiveness in the toxicity removal. With the aim of proposing degradation pathways for each process studied, the reaction intermediates were identified by mass spectrometry. The results showed that the best reductive degradation conformation was the packed-column system, achieving 80% of TCP degradation, with30.6 g of obsolete copper wires and [TCP] 0 = 10 mg L-1 (0.0506 mmolL-1). However, this process only led to TCP dechlorination, not promoting any pollutant mineralization. On the other hand, a total TCP degradation and 40% mineralization was observed in 4 minutes of oxidation with the UV / H2O2process, using 0.056 mmol L-1 of H2O2. By coupling the two processes, a 52% mineralization was achieved within the same reaction period, thus proving that the pre-reductive step improved the organochlorine oxidation. Solutions presenting high degradation values from the reductive step were generally more toxic than the parent-compound, while oxidized solutions presented a certain relation between mineralization and toxicity removal, although not linearly for all the cases.

2
  • MARITTA MEYRELLA DOS SANTOS LIRA
  • SYNTHESIS OF MOLYBDENUM CARBIDE FROM MINERAL FROM RIO GRANDE DO NORTE

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • JOSE HUMBERTO DE ARAUJO
  • YARA FELICIANO GOMES
  • Data: 28-ene-2019


  • Resumen Espectáculo
  • This work proposed a new alternative route of synthesis of nanostructured molybdenum carbide from the base mineral extracted from the city Carnaúba dos Dantas - RN, through gas - solid reactions at low temperature, as well as provided a integrated theoretical view of the morphologic formatation of the synthetized materials. Initially, this starting ore were into a grinding process, followed by milling and sieving, and its characterization performed through X-ray fluorescence (XRF) and X-ray diffraction (XRD), to analyze if its characteristics are satisfactory for the synthesis. In the sequence, the ore treatment was carried out through leaching and hydrothermal treatments. Therefore, it was done synthesis of the precursor, a more reactive reagent, used in the synthesis of the carbide by the gas-solid reaction. The precursor was characterized by granulometric analysis (AG), X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric, thermodifferential and calorimetric (TG/DSC) analysis, infrared (IR) spectroscopy, electron microscopy (SEM) and dispersive energy spectroscopy (EDS). The synthesis reaction occured between the precursor and a gas mixture of H2 / CH4, where hydrogen is the reducing gas and methane is the carbon source. The synthesized nanostructured molybdenum carbide was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) with refinement by Rietveld method, specific surface area analysis (BET), scanning electron microscopy (SEM) and spectroscopy of dispersive energy (EDS).

3
  • ISLANNY LARISSA OURIQUES BRASILEIRO
  •  

     Application of a-Fe2O3/Nb2O5 mixed oxides obtained by the Pechini method in photo degradation reactions.

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • ELISAMA VIEIRA DOS SANTOS
  • JOAO BOSCO LUCENA DE OLIVEIRA
  • VIVIAN STUMPF MADEIRA
  • YARA FELICIANO GOMES
  • Data: 31-ene-2019


  • Resumen Espectáculo
  • Develop new catalysts with high efficiency for the degradation of organic compounds in effluents, mediated by sunlight and that are stable, has been a great challenge. In this work, mixed oxides of a-Fe2O3/Nb2O5 were prepared from a Pechini sol-gel route, with two different mass ratios (a-Fe2Oand Nb2O5 (60/40 and 80/20, respectively) and calcination temperatures between 500 and 800 ° C. The influence of these parameters was investigated on the materials structural, morphological, optical and photocatalytic properties. These catalysts were submitted to methylene blue (MB) degradation tests by both photocatalysis and photo-Fenton reaction. The best performing sample in these initial tests was used in the following tests to optimize the process operating conditions through a 24 experimental design with triplicate at the central point. The catalytic reaction mechanism, the limiting step, the reaction rate law and the catalyst stability were also evaluated. Crystalline nanoparticles were obtained with significant differences in their properties and in the degradation efficiency of the methylene blue dye under UV-Vis radiation. Calcination temperatures between 500 and 800 °C led to the formation of different crystalline phases, including: a-Fe2O3, Nb2O5, FeNbO4 and FeNb2O6; as well as the formation of materials with multigap behavior. High temperatures caused the increase of the particle size and the agglomerative state of the material. The sample composed of 60 % a-Fe2O3 and 40 % of Nb2O5 and calcined at 500 ºC (0,6-Fe/Nb-1) presented the highest catalytic activity and was then used in the following tests in photo-Fenton-like reactions. According to the factorial experimental design 24 performed, the variables that presented a significant effect on the response were: AM, catalyst and H2O2 concentrations. The proposed mechanism followed an LH type kinetics with double site mechanism, with the highest colour removal percentage obtained at 85 % after 4 h of experiment, under the optimum operating conditions found. Comparing the efficiency of the mixed oxide with to a-Fe2Oand Nb2O5, removal percentages were increased by 62 and 15 %, respectively. The catalyst was stable even after 5 consecutive cycles of reaction, unlike Nb2O5, suggesting its potential application in the treatment of environmental pollutants.
     
4
  • FERNANDA MONTEIRO FREITAS
  • Study of niobium oxides consolidation by centrifugal casting method

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • FLÁVIA MELO DE LIMA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • YARA FELICIANO GOMES
  • Data: 31-ene-2019


  • Resumen Espectáculo
  • Brazil holds more than 90% of the world's niobium reserves and is the largest producer and exporter of this material, such as ferro-niobium alloy, niobium oxide and other products. Nevertheless, there is a need to expand the use of niobium in the country in order to make better use of it economically. The Brazilian Ministry of Mines and Energy encourages the development of technological applications to add value to niobium and its derivatives through research. The remarkable chemical and physical properties of Nb2O5 make this material promising for application as adsorbent, gas sensor, solar cells and electrochromic components. Some recent research studies have verified the possibility of several catalytic applications of niobium oxides, either as active phase or as support. Considering the above arguments, a study of the consolidation of Nb2O5 suspensions by the centrifugal casting method was carried. The purpose of the present work was to investigate the efficiency of this simple and low-cost method in the preparation of ceramic supports. Initially, the slip casting method using gypsum molds was tried, but the methodology using centrifugal force proved to be much more effective. The slurries were prepared by mixing Nb2O5 or Nb2O5.xH2O, PVA, agar, deionized water and boric acid dissolved in glycerin. Rotational speed was set at 10,000 rpm during various deposition times (5, 10, 20 and 30 min). Heat treatment was performed at various sintering temperatures varying from 1100 °C to 1400 °C. The dwell time was 4 h. Both green and sintered bodies were characterized by scanning electron microscopy with field emission (SEM-FEG), X-ray diffraction (XRD). The density of green and sintered bodies was determined by the Archimedes method. The results showed significant influence of the sintering temperature on the contraction of the pieces, resulting in an expressive increase of the sintered density with the increase of temperature. The centrifugation time of 20 min was considered more adequate as it resulted in a green density higher than that obtained with 30 min. The packing was also evaluated through the micrographs, which evidence internal and external surfaces with good qualities compared to other ceramics in the literature. Finally, it is concluded that the methodology studied has the potential to produce substrates in specific shapes, obtaining Nb2O5 ceramics that reached 90.9% of theoretical density after sintering at 1400 °C for 4 h.

5
  • WILDSON URSULINO LEITE
  • Solar Distillation for Desalination Purposes: Application of Alternative and Technological Materials for the more Efficient Production of Drinking Water.

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • CLEONILSON MAFRA BARBOSA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • YARA FELICIANO GOMES
  • Data: 15-feb-2019


  • Resumen Espectáculo
  • The water crisis is a global concern whose aggravation makes the desalination of oceanic waters and other saline reservoirs reasonable. In Brazil, the reality of drought has led the Federal Government to create the Water Sweet Program (PAD), among other measures. The PAD proposal is to recover, deploy and manage reverse osmosis systems in rural semi-arid communities. However, after seven years, only 47.6% of the initial target is fully operational. In line with the objectives of the PAD, with the privileged offer of solar energy and with the vast literature that reports the advantages of the use of solar distillers for the conditions like those found in Brazil, the objective of this work is to investigate materials that promote the increase of productivity equipment. For this, tests were carried out in an environment with real and simulated irradiation, investigating mainly the effects of alternative and technological materials in the composition of collector plates and in the improvement of the optical and thermal properties of the brine on the rate of evaporation. The photo-assisted evaporation tests using nanostructured CoFe2O4 presented reproducibility higher than 99% and increased the evaporation rate by 13.8% with respect to reference, and the residual ash plate promoted an effective gain of 18.2%. The solar evaporation tests recorded rates 60.7% higher with theoretically inert plate, painted externally with black commercial paint, suggesting accumulated close to 4.0 kg/m2 in only 3.5 h of sun exposure. Thus, the studies show that the construction of solar stills that meet the inalienable assumptions of low cost, efficiency and safety to exempt contaminants in the distillate, are possible to mitigate the effects of drought in the Brazilian semiarid.

6
  • INGRID MEDEIROS VERAS ROCHA
  • REMEDIATION OF SOILS CONTAMINATED WITH OIL EMPLOYING ELECTROCHEMICAL AND PHYTEMEDICATION TECHNOLOGY


  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DJALMA RIBEIRO DA SILVA
  • ELISAMA VIEIRA DOS SANTOS
  • KEURISON FIGUEREDO MAGALHÃES
  • Data: 22-feb-2019


  • Resumen Espectáculo
  •  

     This work aims to investigate the efficiency of phytoremediation integrated to electrokinetic (ER) remediation processes using graphite electrodes to remove petroleum in contaminated soils. In this sense, the influence of the applied electric field, the growth of the sunflowers, and the type of fluid used to maintain soil moisture were evaluated. The phytoremediation, electrokinetic remediation, electro-phytoremediation with direct current application, electro-phytoremediation with application of inversion of polarities of the electrodes were evaluated, applying 1 V cm-1 for 20 days. Based on the results, it was possible to observe that the integration of ER with phytoremediation promoted higher percentage of germination of sunflower seeds, as well as for plant growth. The removal of petroleum was evaluated considering the total petroleum hydrocarbons (TPH) after 20 days of treatment. The best removal efficiencies were obtained for electromagnetic remediation with inversion of polarity of the electrodes. Finally, at the end of the 20 d of soil treatment, the electrochemical oxidation processes with H2O2 and electro-Fenton were compared for the treatment of residual fluid.

7
  • JONATAS GOMES DE MEDEIROS
  • Study of API K55 steel's corrosion caused by sodium chloride brine in petroleum industry
  • Líder : MARCUS ANTONIO DE FREITAS MELO
  • MIEMBROS DE LA BANCA :
  • MARCUS ANTONIO DE FREITAS MELO
  • DJALMA RIBEIRO DA SILVA
  • ROSANGELA DE CARVALHO BALABAN
  • ROMERO GOMES DA SILVA ARAÚJO FILHO
  • Data: 25-feb-2019


  • Resumen Espectáculo
  • Chloride brines are widely used in the petroleum industry, participating in the formulations of drilling muds, completion brines, etc. In some wells, the brines remain for long time trapped in the annular space above the packer. Therefore, they must have anticorrosive characteristics to guarantee a longer time between of interventions to replace equipaments. In this context, the present work aims to evaluate the influence of pH and concentrations of sodium chloride, sodium bisulfite and corrosion inhibitor about the API K55 steel’s corrosion rate using a factorial design 24 with a central point and also verify the corrosion inhibitor’s efficiencies in the various brines’ compositions. Bases on NACE TM169, the corrosion rate tests were made in triplicate based on the mass difference. The steel specimen were exposed to brines in rotating oven at 90ºC and 274,20 psi of manometric pressure during 24 hours, being cleaning with hydrochloridric acid, tin II Chloride and antimony III oxide solution. It was found the sodium bisulfite concentration effect wasn’t statistically significant in a 95% confidence interval. The effects of sodium chloride concentration, pH interaction with corrosion inhibitor concentration, pH and corrosion inhibitor were statistically significant within the same confidence interval. Using ANOVA, it was verified the statistical model that fit the observed values was predictive with determination coefficient equal to 99.46%. According to the results, the corrosion inhibitor’s highest efficiency was 72,90%, at pH 7.0 and 0,48% v/v of corrosion inhibitor.

8
  • KELVIN GAMA GUIMARÃES
  • Transesterification of Sesame oil in a batch-type process using supercritical ethanol

  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • ANDRE LUIS LOPES MORIYAMA
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • Data: 25-mar-2019


  • Resumen Espectáculo
  • With the increase of environmental problems generated by using fossil fuels the search for more renewable and less harmful alternatives have increased, thereby biodiesel rise as a biodegradable option originated of natural sources. Biodiesel can be defined as alkyl esters formed in a transesterification reaction between an alcohol and triglyceride, usually vegetable oils. In Brazil, soybean oil is the raw material most used in biodiesel production, however it is necessary to search for other oilseeds to diversify production, so sesame oil appears as likely raw material. Sesame has a high oil content in its seed and is suitable for warmer and drier climate. The main way to produce biodiesel is transesterification using basic catalysis, this kind of process has drawbacks about water content in the reaction and in the product purification. Transesterification using alcohol in supercritical conditions does not need catalyst becoming a simpler method. In this work, it is proposed utilize sesame oil as triglyceride source in transesterification reaction with ethyl alcohol in supercritical conditions. Temperature, reaction time and molar ratio oil: alcohol were studied as reaction parameters. The temperature range was 260-290 ℃, reaction time between 7,5-30 minutes while molar ratio varied of 1:36-1:48. In the end, the best ethyl esters yield was 56,62% at temperature of 290 ℃, in a time of 30 minutes and molar ratio of 1:48. 

9
  • PAULO CESAR MESSIAS DA SILVA
  • SUPERCRYTIC INTERESTERIFICATION OF GERGELIN OIL (Sesamum indicum L.) WITH METILA ACETATE AND ACETIC ACID
  • Líder : HUMBERTO NEVES MAIA DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • Data: 28-may-2019


  • Resumen Espectáculo
  • Biodiesel has been established as a promising source of renewable energy and substitute for oil and diesel due to its high energy power, because it is biodegradable and for making a "clean burn". The interesterification with methyl acetate is a new technique and has the advantage of producing, in addition to methyl esters (biodiesel), triacetin (product of great market value). The supercritical technology enables the production of biodiesel without the presence of catalysts, eliminating the need for further purification processes. The Sesame (Sesamum inducum L.) is one of the oldest oilseeds known to mankind. Due to the high oil content in its seeds, the sesame has become a possibility for the production of biodiesel. Thus, this work investigated the production of biodiesel through the interesterification reaction of sesame oil with methyl acetate under supercritical conditions. A continuous tubular reactor was used at conditions of 325-375 °C and 150-200 bar, in residence time of 15-55 minutes, with a molar ratio oil/acetate of 1:40. A 28.8% methyl ester yield was obtained at 375 °c, 200 bar in 15 minutes. Moreover, with the addition of 20% acetic acid solution, a better yield was obtained: 46.6% at 325 º C and 150 bar in 55 minutes.

10
  • FÁBIO GONÇALVES MACÊDO DE MEDEIROS
  • Curcumin microencapsulation into yeast cells (Saccharomyces cerevisiae) via osmoporation: process parameters, thermal stability and antioxidant capacity

  • Líder : ROBERTA TARGINO HOSKIN
  • MIEMBROS DE LA BANCA :
  • ANTONIO DE ANCHIETA CAMARA JUNIOR
  • DANIELLA REGINA ARANTES MARTINS SALHA
  • MARCIA REGINA DA SILVA PEDRINI
  • ROBERTA TARGINO HOSKIN
  • Data: 03-jun-2019


  • Resumen Espectáculo
  • This study investigated the encapsulation of curcumin into Saccharomyces cerevisiae cells through osmoporation as an efficient way of increasing curcumin stability. The influence of three process parameters (cell, ethanol and curcumin concentrations) on the encapsulation process were evaluated and the obtained bio-capsules were characterised with regard to physical and photochemical stabilisation. Results showed that the encapsulation efficiency was favoured by the increase of cells/curcumin ratio and ethanol concentration up to 60%. Differential scanning calorimetry (DSC) curves revealed that yeast-encapsulation increased curcumin melting point up to 207 °C. Encapsulated curcumin retained over 80% of antioxidant activity after thermal treatment (150 °C) and over 70% after a 50-day exposure to artificial light. Photochemical stability of yeast-encapsulated curcumin was increased by 5.7-fold and the half-life time reached 181 days when bio-capsules were exposed to light. Overall, osmoporation-produced yeast bio-capsules confirmed the versatility and efficiency of osmoporation as an encapsulation technique that could successfully improve curcumin stability.

11
  • JOÃO PAULO SOUZA
  • Modeling and simulation of sodium chloride's crystallization in mixtures with water and monoethylene glycol.

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • DANNIELLE JANAINNE DA SILVA
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • JOSÉ AUGUSTO FURTADO DE OLIVEIRA
  • OSVALDO CHIAVONE FILHO
  • Data: 26-jul-2019


  • Resumen Espectáculo
  • Monoethyleneglycol (MEG) is used in the production of natural gas as an inhibitor of hydrate formation, reducing the freezing point in the ducts and protecting against corrosion. Hydrates are crystalline solids that can cause blockages of ducts in the flow of gas production. The produced water is saline, and thus the presence of salts can cause fouling in the MEG regeneration unit. The use of MEG has already known efficacy in the operating environment with respect to hydrate formation prevention. However MEG needs to be regenerated and reused in the system. It is at this stage that technical difficulties may occur due to the presence of MEG. This substance reduces the sodium chloride solubility in the produced water. If this salt concentration is above solubility, undesired crystals precipitation may occur in the MEG regeneration unit. This precipitation can cause problems such as fouling, which is very damaging to the equipment that makes up the regeneration system. Thus, it’s primary importance to know the salt solubility limits under the MEG process conditions. From the operational view point, it’s also important to quantify, in an agile way, how close the system is to salt crystallization. This can be accomplished through the use of a computer simulator that can, from the  plant operating conditions and also laboratory data, calculate in a timely manner the species concentrations and, if necessary, the amount of crystallized salt throughout the MEG regeneration process. The purpose of this work is to create a simulator that can perform mass balance calculations to determine the salt concentration and, by knowledge of solubility, to quantify the salt crystals.

12
  • IZABELLA REGINA DE SOUZA ARAÚJO
  • Phase equilibrium and volumetric behavior of aqueous systems containing CO2, ethylene glycol and NaCl under the conditions of exploitation of natural gas.

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • DANNIELLE JANAINNE DA SILVA
  • DIVAL DE BRITO GUERRA NETO
  • OSVALDO CHIAVONE FILHO
  • Data: 26-jul-2019


  • Resumen Espectáculo
  • Gas explotation in deep water in Brazil brings challenges due to high pressures, low temperatures, high content of CO2 and NaCl carried to the production fluids. The regeneration process of ethylene glycol (MEG), used as a hydrate inhibitor, also presents a field of study regarding the solubility and precipitation of NaCl salt. In this context, this work included the assembly of an experimental apparatus for the evaluation of phase equilibrium in mixtures, under conditions of temperature and pressure, close to those of gas exploration in deep waters, evaluating parameters such as density and solubility, at pressures from 4,0 to 31.0 MPa and temperatures of 293.15 and 323.15 K. The experimental apparatus was assembled through the interconnections between an Anton Paar 4200M densimeter, a syringe pump and thermostatic baths with two types of pressure vessels: the Parr reactor 4561 and a variable volume equilibrium cell. The density points obtained with the experimental apparatus were validated with data and models from the literature. For this purpose, simple systems such as the pure CO2 and water were used (mean deviations of 0.02% for CO2 and 0.15% for water when compared to specific equations for these components), and the CO2 + water (mean deviations below 0.07% when compared with models obtained from literature data). The calibration of the densimeter was carried out to allow using at temperatures between 293.15 and 329.85 K, and pressures between 1.0 and 31.0 MPa, with tetrachloromethane and ethanol, resulting in an uncertainty of 0.09%. In addition to the experimental data obtained from the previously mentioned pure components and the CO2 + water binary system, data were also obtained for the water + NaCl binary system, for the CO2 + water + NaCl ternary system (1 molal and 4 molal saline solutions) and the CO2 + water + MEG (30%, 50% and 80% m/m MEG aqueous solutions concentrations). The software Specs v5.63 and a code made in MATLAB were used to verify which equation of state (Soave-Redlich-Kwong or Peng-Robinson cubic equations or Cubic Plus Association equation) was more adequate to predict the aqueous phase density of the binary and ternary systems with absence of electrolytes under experimental conditions; it being concluded that the use of Cubic Plus Association equation (CPA) resulted in more coherent values of the density of the aqueous phase. In the case of systems containing electrolytes, models developed from literature data were used for comparison with the experimental data of this work.

     

13
  • RICARDO JOSÉ LINS NEVES
  • Study of the Viscosity of Water-Oil Emulsions Contaminated with Drilling Fluid additives
  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • VANESSA CRISTINA SANTANNA
  • ERIKA ADRIANA DE SANTANA GOMES
  • Data: 09-ago-2019


  • Resumen Espectáculo
  • The oil and natural gas industry has several steps that converge towards a common goal, which is to produce derivatives of commercial interest to support its economic viability. Two of the early stages of this industry are crucial to its viability: Well Drilling and Primary Oil Processing. The first is essential for the production of oil and natural gas, since not having producing wells it is impossible to drain the hydrocarbons from the reservoirs to the surface. The second is responsible for the specification of petroleum for transportation from the producing area to the refineries, where it is transformed into derivatives of commercial interest. This work carried out a study of the viscosity of water-in-oil emulsions and the interference that the components normally used in the drilling fluids formulated for the oil and natural gas fields in the state of Rio Grande do Norte provoke in this property when discarded into production pipelines. In addition, a mathematical modeling was carried out to allow the evaluation of the interference of the contaminants of drilling fluids in the treatment capacity of an Oil Treatment Station (OTS). From the viscosity curves the equations describing the viscosity of the emulsions as a function of temperature for the BSW (basic sediments and water) range analyzed were obtained. The viscosities of the emulsions were compared to those of the contaminated emulsions with the selected components of drilling fluids, allowing quantification of the increase in viscosity caused by such contaminants and to verify that barintine and carboxymethylcellulose (CMC) displaced the breakthrough of the emulsions to values of BSW less than 40%. The mathematical modeling performed to describe the treatment capacity of a Warmed Treatment Tank (WTT) made it possible to understand the interferences that the contaminants of the water-oil emulsions caused in their treatment capacity. It was verified that, for the operating conditions considered, xanthan gum did not decrease the treatment capacity of a WTT, but barintine and CMC implied a reduction of up to 10% in treatment capacity and hydroxypropyl starch (HPS) reached a decrease of up to 12%. The information obtained in this study reached its main objective, which was to scientifically prove the interference of the drilling fluid contaminants in the oil treatment capacity, indicating the need for investments in the drilling fluids disposal phase.

14
  • PAULO VENICIUS MESSIAS DOS SANTOS
  • SIMULATION AND MODELING OF A MEMBRANE REACTOR FOR HYDROGEN PRODUCTION

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLSON PEREIRA DE SOUZA
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • VANJA MARIA DE FRANCA BEZERRA
  • FRANCISCO WENDELL BEZERRA LOPES
  • Data: 28-ago-2019


  • Resumen Espectáculo
  • In the recent global warming increase, the demand for less pollutants energy sources and fuels is growing substantially. For this reason, the hydrogen production has been targeted by research and studies. The production of this gas from methane partial oxidation in membrane reactors is showing to be a good alternative. In this work, hydrogen production process through a membrane reactor should was studied by a simulation and modeling point of view. A mathematical model of a membrane reactor assuming one dimension, isothermal and steady state conditions was used. Simulations were made to compare the reactor conversions in different membrane dense type compositions. The molecular structures of the membranes perovskite-type were considered, that is, ABO3. Mathane and hydrogen conversions were evaluated, as well as the composition profiles through the reactor length. A comparison between the performances of the partial oxidation and steam reforming processes was made. In membrane reactors, the reaction process and the separation step are combined in the same device. This provides a cost reduction in production of many important substances, as for example, syngas

15
  • JULIA MARIA DE MEDEIROS DANTAS
  • Chitosan hydrolysis by immobilized chitosanases and non-specific enzymes.

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • NATHALIA KELLY DE ARAUJO
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • LUCIANA ROCHA BARROS GONÇALVES
  • PEDRO FERREIRA DE SOUZA FILHO
  • Data: 22-nov-2019


  • Resumen Espectáculo
  • Chitoligosaccharides (COS), products of chitosan hydrolysis, have high added value due to their bioactive activities. Hydrolysis can be performed by acid, however this method requires high temperatures and does not have a large selectivity regarding their size, a key feature for the expression of bioactive activities. Therefore, the use of enzymes for hydrolysis becomes a good option because it requires mild conditions and they cleavage specific bonds. However, process envolving enzymes are quite costly, so it is necessary to implement strategies to reduce the operations costs. Among these, the immobilization stands out as a technique that usually increases thermal and pH stability, in addition to allow recycling. The use of non-specific enzymes can be highlighted as another strategy. Thus, the present study investigated the immobilization of cellulase, β-glucosidase, and chitosanases for chitosan hydrolysis. Prior to these studies, the chitosanolytic activity of non-specific enzymes were evaluated under different conditions, where the highest activity was obtained at pH 6.0 for cellulase and at pH 4.0 for β-glucosidase, both at 55 oC. In order to evaluate the potential of enzyme immobilization techniques, experiments were carried out with adsorption on cationic resin Streamline SP and covalents bonds on microparticles of silica-gel. Regarding the adsorption, pH 5.0 favored the immobilization of all enzymes, and in terms of enzyme load, cellulase and quitosanase were favored by the lower enzimatic load (25 U/g) and β-glucosidase was favored by the higher enzymatic load (50 U/g). When analyzing the covalent bonds assays, the enzymes followed the same trend of enzimatic load, but in terms of glutaraldehyde concentration, cellulase and β-glucosidase were favoured at the highest concentration (1.00%), while the chitosanase obtained the best result with the lowest concentration (0.50%). It is noteworthy that thermal stability, pH and recycle tests were performed to determine the best immobilization strategy for each enzyme. Thus, the best immobilization strategy for cellulase and β-glycosidase was covalent bonds, when compared to adsorption, since it favored the stability of both enzymes during recycles (presenting 40% compared with 20% of adsorption for cellulase, and 14.75% against only 5.75% in the adsorption system for β-glycosidase). Finally, both immobilization strategies were feasible for increasing the stability of chitosanase, but adsorption showed a marked increase in performance when compared to the covalent bond strategy when considering the 65.00% of the initial activity at the end of the recycle against 44.42% of the covalent system. In the end, all three immobilized enzymes were successful in chitosan hydrolysis.

Tesis
1
  • LAÍS SIBALDO RIBEIRO
  •  Optimization of microemulsion gels as a remediation fluid for lost circulation

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • TEREZA NEUMA DE CASTRO DANTAS
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • MARCOS ALLYSON FELIPE RODRIGUES
  • PEDRO TUPÃ PANDAVA AUM
  • TAMYRIS THAISE COSTA DE SOUZA
  • Data: 17-ene-2019


  • Resumen Espectáculo
  • Lost circulation is a serious and costly problem for the oil industry and it may happen during a drilling in permeable formations, natural fractions or caves. To mitigate this lost, gel systems combined with Lost Control Materials (LCM) is used, this combination is called buffers. However, sometimes these buffers are not effective, and there is a need for new technologies to solve this problem. Approximately 85% of the gross weight of the coconut consists of the husks, which is accumulated in dumps or in the banks of roads, then its hernessing becomes necessary. This work aimed to develop a new generation of buffer using surfactant-based gels and coconut fibers in different granulometries, treated with microemulsions, to prevent losses in carbonates, oil-wettable microfractures and to study the interactions between fiber-emulsio, gel-rock, fiber-rock and analyze the capacity of remediate the lost and in situ gelling ability. For the tests with the surfactant-based gels, two anionic surfactants were tested one of them was soap base, used in the systems,1 (S1) and 2 (S2) and the other one was saponified castor oil - SCO, which generated the third system, S3. Two microemulsion systems were tested for the treatment of coconut fiber, one with cationic surfactant (CTAB) with three types of micelles (direct micelle (MD), bicontinuous (MB) and reverse (MR)), another with anionic surfactant (soap base) at the point of bi-continuous micelle (SB). These fibers was analyzed through the TG-DTA, SEM, XRD, FRX and contact angle analyzes. The buffers were characterized by rheology, weight and filtration. A lost circulation apparatus was developed and used with the better buffer, and an in situ gelling test was performed. The best buffer was S2 with fibbers mesh sizes # 35, # 100 and # 200 because presented a pseudoplastic behavior, with high viscosities and tensions, characteristic of buffers, low filtrate volumes below 10 mL, and a rapid formation of filtercake (15 minutes). In the loss simulator apparatus, the S2 with granulometric fibers # 35, # 100 and # 200, treated with the SB, was able to reduce the permeability by 50% with the minimum mass (50 g) of the studied fluid. The fibers treated with the SB, presented affinity for the developed gel and allowed the gel spread on the surface of the pores of the rock, and presented the chemical affinity for the surface, facilitating the process of deposition and buffering of the fractures. For this reason, fibers treated by SB were chosen as the LCM of the new product. In situ gelation test showed that at 70 ℃ the gelling happen in 40 seconds, excellent result, making operation quick, efficient and less costly, with less probe time support.

2
  • JANDUIR EGITO DA SILVA
  • Cultural waste from naturally colored cotton for the production of biofuels and renewable aromatics
  • Líder : RENATA MARTINS BRAGA
  • MIEMBROS DE LA BANCA :
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • DULCE MARIA DE ARAUJO MELO
  • ALFREDO ISMAEL CURBELO GARNICA
  • BRUNA MARIA EMERENCIANO DAS CHAGAS
  • Data: 21-ene-2019


  • Resumen Espectáculo
  • The crop residues of colored cottons is agricultural waste with the potential for distributed energy production. They are very resistant to drought cultivars, with national production which can be considered significant and growing, being lignocellulosic biomasses with high dry matter/ha/year production. Given the need to evaluate the energy potential of these residues, the present work has the objective of analyzing different cotton cultivars produced by EMBRAPA cotton through energy characterization and conversion of biomass to energy through the processes of rapid pyrolysis and briquetting. Biomass characterization was performed through an immediate analysis, elemental composition, hemicellulose content, cellulose and lignin, apparent density, calorific value, thermogravimetric analysis and spectroscopy in the infrared region. The results indicated significant energy potential such as high calorific value of 17 MJ/kg and low ash content (6 %), among others. Analytical pyrolysis was performed at 500 °C in a CDS 5200 HP-R CDS Analytical micro pyrolyzer, connected to a gas chromatography with mass spectrometric detection. The results of the condensable vapors composition of conventional pyrolysis indicated the presence of many oxygenated compounds of different organic groups, with aldehydes, ketones, phenols, furans and ethers, being characteristic of the decomposition of lignocellulosic materials. The enhancement of the bio-oil (upgrading) to enable the physico-chemical properties of the condensable vapors as fuel and/or the isolation of certain chemical compounds of these vapors was carried out through the use of three catalysts: commercial ZSM-5 and HZSM-5 at different temperatures of the catalytic bed. All the catalysts used promoted forming monoaromatics such as benzene and toluene, especially at 500 °C, with the quantities of these compounds being most expressive at this temperature, especially HZSM-5. The analyzed biomass presented favorable energy characteristics for application in thermochemical processes, while also being applied in the briquetting process using a pilot machine used to make laboratory-grade briquettes by O & C do Brasil - Automation Hydraulics. The results indicated high energy density and good mechanical resistance (9 kN/mm2) of the produced briquettes, especially those formed from the mixture of bark and cotton rods. Finally, it can be concluded that crop residues of colored cotton can be used in the pyrolysis process, especially in the catalytic pyrolysis process, and can be an excellent source of renewable raw material for the chemical industry, as well as to subsidize the national energy matrix.

3
  • MAYARA FELICIANO GOMES
  • Study of the obtaining and characterization of chitin and chitosan from shrimp residues and their sustainable energy applications.

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • CLEONILSON MAFRA BARBOSA
  • FLÁVIA MELO DE LIMA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • Data: 04-feb-2019


  • Resumen Espectáculo
  • Currently one of humanity's biggest concerns today is the fate of industrial waste and the study of alternatives to sustainable energy. In this context, the aim of this work was to obtain chitosan from the discards of carniciculture, the biopolymer chitin and it is deacetylation by means of alkaline hydrolysis. The demineralization steps were performed through deproteinization to obtain chitin, and deacetylation to obtain chitosan, were characterized by X-ray diffraction (XRD), X-ray fluorescence (FRX), scanning electron microscopy (SEM), thermogravimetry (TG), UV visible and Fourier transformer spectroscopy (FTIR) for confirmation of  obtain  chitin and chitosan with an acetylation degree of DA of 70 and 75%, respectively.. The biopolymers, it was possible to perform the hydrothermal carbonization synthesis, which is a low cost process, of two renewable precursors, which are materials derived from biomass (chitin and chitosan) and graphite as a third material used to obtain two solid phase and liquid. The liquid phase would be for the formation of carbon quantum dots (CQDs) with application in solar cells and photocatalysis, and the solid phase for the formation of heterogeneous catalysts for reactions of transesterification of biodiesel. The phases were characterized according to the needs of their applications obtaining for the liquid phase a CQDs with quantum yield of 17.1% with doping in ZnO / CQDs with photocatalysis property. And for the solid phase a heterogeneous graphite-chitosan catalyst obtained process efficiency by gas chromatography with 36% conversion. Obtaining chitin and chitosan biopolymers is a great solution for the tons of waste produced in the shrimp industry. The realization of hydrothermal carbonization synthesis to obtain two products, the CQDs and graphite-chitosan catalysts demonstrate great alternatives for the use of sustainable energy in photocatalysis and transesterification reactions.

4
  • DIEGO OLIVEIRA CORDEIRO

  • DEVELOPMENT AND EVALUATION OF HETEROGENEOUS CATALYSTS OBTAINED FROM EGGS 'SHELLS, FOR SOYBEAN BIODIESEL SYNTHESIS
  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • LUIS FERREIRA DE LIMA
  • MARCIONILA DE OLIVEIRA FERREIRA
  • ROBERTA PEREIRA DA SILVA
  • Data: 11-mar-2019


  • Resumen Espectáculo
  • The gradual growth of energy consumption in the world has been linking concerns about the depletion of energy sources and the environmental imbalance due to the predatory use of natural resources. In the world, only 9% of the energy consumed comes from renewable sources. Given this high global dependence on non-renewable energies, research is needed to develop new sources of alternative energy. Biodiesel, a biofuel used for diesel cycle engines, is proving to be one of the viable alternatives to this current problem. The REN21 report states that biodiesel had the largest increase among biofuels in the last decade. This growth represented 15 times the volume of production from 2002 to 2012. Biodiesel also has, in some respects, advantages over petroleum diesel, such as: non-toxic, from renewable sources, environmentally innocuous and relatively biodegradable, in addition to (during the combustion process) emissions of gaseous pollutants such as carbon particles, carbon monoxide, sulfur oxides and polycyclic aromatic hydrocarbons. Biodiesel is usually obtained through transesterification, in which one mole of triacylglycerides reacts with three moles of alcohol (methanol or ethanol) to form three moles of biodiesel and one mole of glycerine. The reaction is usually catalyzed by a strong homogeneous base, NaOH or KOH. However, the use of homogeneous catalysts results in soap formation, separation difficulty, effluent generation. Due to these limitations, the need to study heterogeneous catalysts to obtain biodiesel arose. CaO is a heterogeneous catalyst that stands out for its high catalytic capacity and easy to obtain. However the catalytic results of these solids are highly dependent on the preparation method as well as on the reaction conditions employed. Therefore, the objective of the research is to develop, analyze and evaluate several heterogeneous catalysts obtained from the calcined egg shell, for the production of soybean biodiesel via methyl. To obtain the different CaO samples, three raw materials (white egg shell and chicken brown and commercial CaCO3) calcined at different temperatures (800 °C, 900 °C and 1000 °C) and time (80 °C, 120 and 160 minutes) over a heating rate of 5 ºC mim-1. Totaling 27 samples. The best result among egg shells was the white bark sample calcined at 80 ºC in 160 minutes (CB8P16). CaO has a disadvantage, it undergoes rehydration and carbonation reactions very easily, forming Ca(OH)2 and CaCO3, respectively. However, even after the majority formation of CaCO3, the properties and characteristics present are maintained, as a strong base and presence of active sites on the surface, which characterize as a solid catalytic potential for transesterification reaction. Another reason for the maintenance of catalytic capacity. The initial mixture between methanol and the catalytic solid, forming Ca(CH2)3, which presents more catalytic characteristics than CaO, causing a process called CaO activation. The calcined mixture between CaO derived from chicken hulls and diatomite, forms wollastonite, a compound with similar capacity to CaO precursor

5
  • ERINÉIA DA SILVA SANTOS
  • Study of the lubricity of emulsion/microemulsion systems for application in cutting fluids.

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • SALETE MARTINS ALVES
  • DAMILSON FERREIRA DOS SANTOS
  • JOAO TELESFORO NOBREGA DE MEDEIROS
  • MARCIANO HENRIQUE DE LUCENA NETO
  • ROBERTA PEREIRA DA SILVA
  • Data: 11-mar-2019


  • Resumen Espectáculo
  • Development of new cutting fluids constitutes an important field of scientific and technological activity, since most of the fluids are part of the consumption of petroleum source, and this source is limited and not renewable. Recently, emulsion systems have been studied as an alternative to improve tribological applications as fluids that improve lubricity. Thus, this work aimed to formulate, characterize and study the tribological performance for O/A emulsions and A/O microemulsion systems with different anionic surfactants (soap base) and non-ionic nonylphenol polyethoxylates with different degrees of ethoxylation to apply as cutting fluids. Epoxidized vegetable oil was use for the development of emulsion and microemulsion systems. The main physico-chemical properties were determined for the formulations, such as density, acidity, iodo index, oxirane index, small angle X-ray scattering analysis (SAXS), particle size, rheological measurements and contact angle. In order to evaluate the tribological performance of the systems, a High Frequency Reciprocating Rig (HFRR) tribromometer, consisting of a plane type ball wear test. Based on the results presented above, it can be concluded that the physicochemical properties analyzed are suitable for the fluid as lubricants. The lower concentration of anionic surfactant (1%) presented lower coefficients of friction for the studied emulsions. The emulsions developed with 5% surfactant showed higher coefficient of friction and wear rate. The microemulsion systems have cylindrical shapes, in which it contributes to higher viscosity in the systems. When comparing the coefficient of friction in systems formulated with different surfactants NP4EO, NP6EO and NP9.5EO, it was observe that the coefficient of friction tends to increase in the systems (M1-M3) as the degree of ethoxylation increased and as increased the concentration of surfactant.

     

6
  • JESSICA MARIA DAMIAO DE ARRUDA CAMARA
  • Kinetic Study of the rhamnolipid production by Pseudomonas aeruginosa and its application in enhanced oil recovery.
  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • ANDREA OLIVEIRA NUNES
  • ANITA MARIA DE LIMA
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO KLEBSON GOMES DOS SANTOS
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • Data: 22-jul-2019


  • Resumen Espectáculo
  • The biosurfactants displays an alternative to the use of synthetic surfactants, especially when considering their advantages of less toxicity, greater biodegradability and stability. Among these biosurfactants, the rhamnolipid, produced by Pseudomonas aeruginosa, has been presenting itself as one of the most notable biosurfactants as a result of its high performance and applicability in advanced petroleum recovery. However, the large scale application of rhamnolipids has been a challenge to companies since the costs of production are high, due to, mainly, the downstream purification process. Therefore, in this study the production of  rhamnolipid by a strain of Pseudomonas aeruginosa was investigated and optimized. The Plackett-Burman design was used to select the variables that affect significantly the production yield of the biosurfactant and the Central Composite design was used to optimize the rhamnolipid production. Afterwards, the kinetic modeling was performed, in which four non-structural models were tested, and the parameters were optimized through the genetic algorithm and the numeric discretization by the Runge-Kutta method. The biosurfactant produced was characterized and evaluated regarding its capacity of being used in the Microbial Enhanced Oil Recovery (MEOR), finally, the influence of the purification stage was investigated in the rhamnolipidability to increase oil production after the convencional recovery process. The results indicated that the optimal values of temperature, pH, carbon/nitrogen rate, glycerol concentration and time (variables selected through the statistical experimental design) are, respectively, 30.17°C, 7.37, 32.35, 9.36% (v/v) and 10.26 days. The biosurfactant produced also presented a excellent emulsification rate, approximately 67% for the n-hexane and 69% for the petroleum, and a capacity of reducing the water superficial tension from 72 to 35.26 mN/m in a c.m.c of 127 mg/L. Furthermore, the rhamnolipid also presented a good stability to wide ranges of pH and salinity. Such characteristics configured the rhamnolipid as a good candidate to the application in MEOR. The kinetic parameters, of four non-structural models, for the experimental data of four rhamnolipid production curves were optimized by the genetic algorithm method and the main result demonstrated that the Monod model is the best predicting the data, with values of  µmáx equal to 0.06 h-1, KS equal to 50.8 g/L, YX/S equal to 0.43 g/g and YP/X equal to 0.017 g/g. At last, with the tests of advanced recovery, it was demonstrated that the rhamnolipid can efficiently recover the oil, obtaining the best result for a biosurfactant concentration 100% above the c.m.c and petroleum with a API Gravity of 21.90, which was able to achieve a total recovery of 50.45±0.79%, of which 11.91±0.39% corresponds to the MEOR. Moreover, it was evidenced that the biodegradability of the rhamnolipid did not represent a desavantage and that bigger investments in purification processes for the biosurfactant would be dispensable, since the biosurfactant was able to maintain its ability of increasing the oil recovered factor, even after two months of production. Also, the non-purificated rhamnolipid presented higher recovery factors when compared with the purificated, for all three types of oils studied.

7
  • MILLENA CRISTIANE DE MEDEIROS BEZERRA JÁCOME
  • Use of mangaba industrial waste (Hancornia speciosa Gomes) to obtain biotechnological products.

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • FRANCINALDO LEITE DA SILVA
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • NATHALIA KELLY DE ARAUJO
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 09-ago-2019


  • Resumen Espectáculo
  • Currently, the search for the integral use of lignocellulosic materials is necessary in the attention to the environment, as well as in the reduction of costs and valorization of this raw material. Among these materials are agro-industrial waste widely used to obtain various products such as oil, extracts, and enzymes, among others. This study investigates the use of the characterized mangaba waste (Hancornia speciosa Gomes), highlighting its oil content, and using it as a substrate for the production of enzymes (lipases, pectinases and polygalacturanases (PG)). Solid-state fermentation (FES) using the filamentous fungus Aspergillus niger IOC 4003. Mangaba residue and its ethanolic extracts were evaluated for physicochemical and bioactive aspects, especially the total phenolic content and antioxidant capacity. Among the evaluated enzymes, polygalacturonase was submitted to stability tests under different temperature and pH conditions and applied at a concentration of 1.0% in the clarification process of mangaba juice. It is noteworthy that the post-fermentation residue was used for lignin extraction that was applied to obtain chitosan biofilm, evaluating their antioxidant capacity as well as their capacity to increase the shelf life of papaya (Carica papaya) after coating. The results showed that mangaba residue has antioxidant activity with total phenolic compound concentrations of 564.1 ± 0.047 mg gallic acid equivalent / g extracted oil and Total Antioxidant Activity - TCA of 95.46 ± 1.58 mg equivalent of ascorbic acid / g residue. Furthermore, by FES it was possible to produce lipases (50.11 ± 0.02 U / g), pectinases (0.45 ± 0.01 U / g) and polygalacturonases (76.32 ± 0.11 U / g). The extract showed stability to PG activity above 80% for temperatures of 20 and 25 ° C, maintaining this activity level for up to 1 hour. However, with significant reduction at temperatures above 40 ° C. In relation to pH, PG activity was considerably reduced at alkaline pH and, at pH 4 and 5, PG kept its relative activity above 50% for up to 120 minutes. When applied with enzymatic load of 1.0 U / mL, the enzymatic extract presented satisfactory results in the clarification process of mangaba juice allowing a 34% reduction in turbidity and 11% viscosity. The 2% chitosan biofilms added with 0.1% and 0.05% (w / w) alkaline lignin showed antioxidant activity, based on the capture of the DPPH radical. The fruits coated with filmogenic solutions had their shelf times increased. Thus, mangaba waste is presented as a low cost raw material with potential for the production of biotechnological products of interest to society.

8
  • ALFREDO JOSÉ FERREIRA DA SILVA
  • Adsorption of copper ions using bioadsorbent and argilomineral: kinetic, thermodynamic and equilibrium study.

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO KLEBSON GOMES DOS SANTOS
  • FRANCISCO WENDELL BEZERRA LOPES
  • LUIS FERREIRA DE LIMA
  • ROBERTA PEREIRA DA SILVA
  • Data: 23-ago-2019


  • Resumen Espectáculo
  • The toxicity, non-biodegradability and bioaccumulation presented by industrial effluents containing heavy metals has become a deep environmental concern. Given this fact, there are already several treatment techniques to remove heavy metals from industrial effluents, but they have some disadvantages, such as inefficiency in treatment, high cost, use of chemicals in the treatment and problems with the disposal of waste. sludge formed. From this finding, there has been research with materials that can be used to overcome these deficiencies, presenting satisfactory results in the removal of heavy metals in the treatment of industrial effluents. Carnauba straw dust and bentonite in their natural and modified forms were used as adsorbents to remove copper in aqueous solution. The experiments were performed from the evaluation of the influence of the variables pH, contact time, adsorbent mass, initial metal concentration, effects of binders and co-ions on the metal removal efficiency and adsorbent regeneration capacity. From the experimental data, it was possible the kinetic, thermodynamic and equilibrium study of the adsorption process. FTIR, BET, FRX, XRD and Potential zeta analyzes were also performed to characterize the materials used in the adsorption process and to ensure the efficiency of their modifications. In the kinetic study, all adsorbents adjusted to the pseudo second order kinetic model and it was observed that, in general, the adsorbents used presented a fast kinetics, in which PPC, PPCTB, BNAT, BSOD reached equilibrium time. 5, 25, 100 and 100 minutes, respectively. The equilibrium study showed that the experimental data of the adsorbents studied supported the Langmuir model. The maximum adsorption capacity of PPC, PPCTB, BNAT, BSOD were 8.48, 21.97, 12.92 and 24.51 mg/g, respectively. Studies showed that although the materials had a low surface area, they had other positive characteristics, such as PPC and PPCTB with functional groups (hydroxyl and carbonyl) with good interaction capacity, and BETNAT and BETSOD with good exchange capacity cationic. The thermodynamic parameters obtained in the adsorption experiments showed that for PPCTB, BNAT, BSOD the process was non-spontaneous and endothermic, whereas for PPC the process was spontaneous and exothermic. In the desorption and regeneration study of natural and sodium bentonites, 4 cycles of dsorption and desorption were required. The desorption efficiency of copper ions using sodium and natural clay decreased from the first to the last cycle from 69.47% to 41.33% and from 48.36% to 22.46%, respectively.

     

9
  • SUZARA RAYANNE DE CASTRO SENA
  • Evaluation of Ethyl Esters as a Gasoline Additive. 

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA GAMBINI PEREIRA COURTIAL
  • EDUARDO LINS DE BARROS NETO
  • ERINÉIA DA SILVA SANTOS
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • MANOEL REGINALDO FERNANDES
  • Data: 26-ago-2019


  • Resumen Espectáculo
  • The objective of this study was to evaluate the application of ethyl octanoate and ethyl oleate in different concentrations as gasoline additives based on characterization analyzes, consumption in Otto cycle engine and the effect of additives on fuel lubricity. The analysis results of vapor pressure, distillation curve and corrosiveness were within the values required by Brasilian legislation. In relation to the rheological study, the Oswald de Waele model best fitted the experimental values of the gas + ester systems, which was also the model that best fitted the experimental data for pure gasoline data. Both esters increased the density of the fuel with increasing their concentration in gasoline. The results for heat of combustion of the obtained fuels were better than results reported in the literature for other oxygenated additives. Through measurements of the octane number MON (Motor Octane Number) and RON (Research octane number) it was found that the octane of the ethyl octanoate containing formulations was higher when compared to the formulations containing ethyl oleate. The lubricity tests were carried out using a HFRR (High Frequency Reciprocating Test Rig) equipment. The WSD (wear scar diameter) values have decreased as the esters proportions have increased in the samples. The percentage of lubricant film presented values above 85% for formulations with 10% and 15% ester concentration. The values of the coefficient of friction have shown a similar behaviour, they have decreased as the esters fractions have increased. The analyzes of fuel consumption were performed using a Otto cycle engine four-stroke, in which the rotation was conserved at 4400 rpm and wheel power varied from 3 kW to 12 kW, with intervals of 3 kW to obtain hourly fuel consumption curves and brake specific fuel consumption. Even esters having lower heat of combustion, hourly fuel consumption was similar to pure gasoline (type A). In relation to the brake specific fuel consumption, increasing the wheel power had a better conversion of the mass of fuel burned into energy. The results also showed that ethyl octanoate presents better characteristics to be added in gasoline when compared to ethyl oleate.


10
  • GISELLE KALLINE GOMES CARVALHO BARROS
  • XXXXXXX

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO WENDELL BEZERRA LOPES
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • DAMILSON FERREIRA DOS SANTOS
  • RICARDO PAULO FONSECA MELO
  • Data: 30-ago-2019


  • Resumen Espectáculo
  • The presence of heavy metals and dyes in industrial wastewater is dangerous and very toxic to the ecosystem and human life, especially at levels above the allowed limit. Both pollutants have resistance to biodegradation, causing serious damage to living organisms and photosynthetic activities. Therefore, it is necessary to use treatment methods that can remove these pollutants to acceptable levels. The use of surfactants may be a viable alternative in the removal of these pollutants. In this work, ionic flocculation was used to remove copper ions by sodium hexadecanoate, through an innovative process approach, identifying the Krafft point as a limiting factor for ionic flocculation occurs. Thermodynamic parameters were evaluated and a statistical design of the copper ion removal process was made. About 95% of the copper ions could be removed using a surfactant/metal molar ratio of 2, pH 4.6 and temperature 60 ° C. The use of the anionic surfactant soap base in the removal of ionic dyes was also studied. The use of this surfactant in the process of precipitation removal, ionic flocculation and in a process combining the ionic flocculation with the liquid-liquid extraction was evaluated. The addition of surfactant to the liquid-liquid extraction process increased the removal efficiency from 26% to 91%. Carboxylates of different chain lengths were used to remove Acid Red 57 by ionic flocculation, and it was observed that the percentage of dye removed and the interfacial properties were influenced by both the chain length of the surfactant and the micellar shape. In addition, a study of mixed micelles systems, formed by the binary mixture of sodium dodecanoato and sodium hexadecanoate, was performed from the determination of micellar composition and interfacial properties. The variation of the molar composition of the mixture directly influenced the molar composition of the micelle, surface parameters and micelle shape. By increasing the amount of the longer chain surfactant the micelle changed from lamellar form to cylindrical form.

11
  • JULIANA LEAO MAIA
  • MICROENCAPSULATION OF MALAY APPLE (Syzygium malaccense L) EXTRACT  USING SPRAY DRYER AND FREEZE DRYER.
  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • ANA LUCIA DE MEDEIROS LULA DA MATA
  • CAMILA GAMBINI PEREIRA COURTIAL
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • KATIA CRISTINA BORGES
  • ROGERIA HELEN LIMA VIDAL
  • Data: 30-sep-2019


  • Resumen Espectáculo
  • The Malay apple tree is found in the Northeast region of Brazil and the little knowledge about the composition of its fruits, which may have their properties better explored, motivated this study. Among naturally occurring antioxidants, anthocyanins are dyes responsible for the bluish-red coloration of a wide variety of vegetables. There is a growing interest in its use by the food industry, but its vulnerability to environmental factors makes processing necessary to make them stable. In this sense, spray drying is applicable and the spray dryer has been shown to be effective in this process. The objective of this work was to perform drying tests of jambo bark extract in spray dryer and lyophilizer and to analyze the product obtained through physical chemical analysis, images and particle size, proceeding to the quantification of bioactive compounds. in order to prove the preservation of antioxidants and to carry out a preliminary study on their possible encapsulation.
12
  • SUZIANI CRISTINA DE MEDEIROS DANTAS SOARES
  • SPOUTED-BED DRYING OF ACEROLA PULP (Malpighia emarginata DC) AND GUAVA (Psidium guajava L.): EFFECTS OF ADDING MILK AND MILK PROTEIN ON PROCESS PERFORMANCE AND CHARACTERIZATION OF DRIED FRUIT POWDERS

  • Líder : MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • MIEMBROS DE LA BANCA :
  • KATIA CRISTINA BORGES
  • MARCELLO MAIA DE ALMEIDA
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • ODELSIA LEONOR SANCHEZ DE ALSINA
  • THAYSE NAIANNE PIRES DANTAS
  • Data: 07-oct-2019


  • Resumen Espectáculo
  • The drying of acerola and guava pulp was studied in this work with bovine milk (powder and reconstituted in water) and concentrated whey protein as adjuvant, aiming the production of powders. The mixtures were processed in spouted bed dryer with high density inert particles of polyethylene at 70 °C. The dust production kinetics was obtained and the yield and the thermal efficiency of the process were calculated for all experiments. The physico-chemical properties of mixtures were evaluated and compared to pure pulps. Produced powders were evaluated regarding their moisture content, water activity, hygroscopicity, solubility, particle size, mineral composition of surface and the images obtained by scanning electron microscopy. Considering the low impact of freeze-drying, drying powders produced in spouted bed were compared with freeze dried pure acerola and guava powders. It also evaluated the impact of thermal processing on the retention of ascorbic acid and concentration of carotenoids in the powder. According to the results, the powders production and the yield was higher for mixtures of guava (45.21%) than for mixtures of acerola (23.06% on average) but in relation to thermal efficiency the results, for all the experiments regardless the fruit, were compatible and with an average value of 42.2%. The moisture of the freeze-dried powders and mixtures were between 5.28 to 7.04% for acerola and, 8.3% to 6.6% to guava. The water activity of both fruits mixtures did not suffered significant variation, 0.373 on average, registering the lowest value of 0.300 and 0.218 for freeze-dried powders of pure pulp of acerola and guava, respectively. Regarding other properties, they were poorly soluble and hygroscopic, highlighting the greater solubility, hygroscopicity and average diameter of particles of the lyophilized powders. The addition of adjuvants enriched the product in relation to calcium and protein content, noting the greater retention of ascorbic acid in mixtures with addition of dried milk (72.9 and 44.1%) when compared to powders obtained by freeze-drying (58 and 34.3% for acerola and guava respectively. Spouted bed drying was an effective way to produce acerola and guava based powders, using dairy products as drying adjuvants. The production of dried fruit extracts using milk as adjuvant is an interesting option for the food industry in the preparation of dairy products such as ice cream, yoghurts and desserts. In addition, the products presents satisfactory nutritional and bioactive attributes, with the combination of milk powder composition and the ascorbic acid content of fruit. Although the addition of a lower concentration (1%) concentrated serum protein has not affected the production of powders, the fluid dynamics of the spouted bed processing was favored. Similar strategy can be applied to different fruit pulps and represents a feasible alternative for processing fruit waste.

13
  • DANIEL NOBRE NUNES DA SILVA
  • Study of solid-liquid extraction for drilling cutting treatment using Microemulsion

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • KLISMERYANE COSTA DE MELO
  • TEREZA NEUMA DE CASTRO DANTAS
  • VANESSA CRISTINA SANTANNA
  • ZILVAM MELO DOS SANTOS
  • Data: 14-nov-2019


  • Resumen Espectáculo
  • The wish for economic development is linked to the increased consumption of fossil fuels and consequently a growing generation of toxic waste to the environment. Drill cuttings is one of these wastes, which in addition to being highly toxic, due to the presence of n-paraffin from the drilling fluid adsorbed to it (waste class I - NBR 10004: 2004), is also generated in large quantities. This study presents an alternative to the treatment of drill cuttings (vertical drill cuttings dryer) using microemulsion systems, aiming at the removal of this n-paraffin and thereby reducing environmental impact. For this task it was necessary to study the solid-liquid extraction between the systems (solvents) and drill cuttings. The variables of the solid-liquid extraction (solvent, solvent/drill cuttings ratio, stirring speed and contact time) were studied, as well as the methodology of ultrasonic extraction, used as the best possible extraction. Gas chromatographic analysis with flame ionization detector (GC-FID) was used to quantify the extracts. The obtained results showed that the microemulsion using the L90 surfactant (AP= 83%, C/S=16% e OP=1%) obtained better performance with 55.6% extraction of n-paraffin. In the study of the microemulsion/drill cuttings ratio, the ratio equal 1.0 obtained better result (55.39% extraction), whereas using 2.0 the extraction was 56.32%. In the study with the stirring speed was identified that the higher the speed the better extraction (56.24%), but it was identified that small stirring speed is reduced to extraction (46.12%). In the parameter of contact time an increase in the percentage of extraction with the increase of the time was also found, reaching levels higher than 80% of extraction with time of 160 minutes, but with time of 80 minutes has already reached percentage of extraction of 76%. It was concluded that the use of microemulsion systems promoted the treatment of drill cuttings at high levels, for chemical extraction, allowing a viable alternative for waste treatment and placing it at levels of acceptable contaminants (6.9% of fluid retained in the drill cuttings - US EPA, 2000).

    Keywords: solid remediation, solid-liquid extraction, microemulsion, n-paraffin, ultrasonic extraction.

14
  • CAMILLA EMANUELLE MENDES ROCHA GURGEL
  • GREEN AND RIPE BANANA POWDER PRODUCTION THROUGH FOAM LAYER DRYING - OPTIMIZATION OF OPERATING CONDITION, PROCESS MODELING AND PRODUCT EVALUATION

  • Líder : MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • MIEMBROS DE LA BANCA :
  • KATIA CRISTINA BORGES
  • MARCELLO MAIA DE ALMEIDA
  • MARCIA REGINA DA SILVA PEDRINI
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • THAYSE NAIANNE PIRES DANTAS
  • Data: 18-nov-2019


  • Resumen Espectáculo
  • The drying of green and ripe banana foams with the addition of albumin was studied, considering as independent variables the albumin concentration (2.5, 5.0 and 7.5%), drying temperature (60, 70 and 80 ° C) and the thickness of the foam layer (0.8; 1.3 and 1.8 ± 0.02 cm). The experiments were performed according to a fractional experimental design 33, with 2 repetitions at the central point. The effect of albumin concentration and beating time on the density and expansion of banana foams was investigated. The drying curves were plotted and the Page and Midilli models were adjusted to the experimental data of humidity ratio as a function of time throughout the drying period and the Fick model to the decreasing rate period. The effect of temperature (60 ° C, 70 ° C, and 80 ° C) on the physicochemical characteristics of the powders resulting from drying of the foams with 5% albumin and 0.8 cm thickness was evaluated. Moisture, soluble solids content, pH, centesimal composition, water activity, solubility and hygroscopiscity of the powders were determined. The beat time and concentration that resulted in the greatest expansion were 4 minutes and 5% albumin. In all drying curves, a constant rate and a decreasing rate period were identified. The effects of independent variables on drying parameters were evaluated by observing through statistical analysis the effect of temperature and thickness on drying rates in both the constant rate and average drying rates considering the constant and non-constant rates. decreasing. The operating variables had significant effects on effective diffusivity, but opposite effects of albumin concentration and thickness were observed for green and ripe bananas. Through the analysis of the proximate composition of the powders produced from the drying of the lyophilized foams and pure pulps, the products were enriched in relation to the higher concentration of proteins and mineral salts. For both fruits, the powders resulting from the drying of the foams and the freeze drying showed low humidity and water activity, are not hygroscopic, observing the reasonable solubility of the ripe banana powder against the green banana, concluding that the characterization banana powder was satisfactory and is in accordance with the Brazilian norms established for agroindustrial products. Sensory analysis showed that the formulation of a vitamin with 30% added of the banana powder and milk did not differ in flavor from the mixture made with fresh banana and milk.

15
  • IGOR MICAEL ALVES UCHÔA
  • Evaluation of properties and atmospheric emissions of diesel microemulsion with glycerin.

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • AFONSO AVELINO DANTAS NETO
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • ALCIVAN ALMEIDA EVANGELISTA NETO
  • MANOEL REGINALDO FERNANDES
  • Data: 06-dic-2019


  • Resumen Espectáculo
  • Currently petroleum-based fossil fuels are widely used for power generation and work. One of the main applications is in the transportation sector, especially mineral diesel. The widespread use of this fuel has increased emissions of polluting gases into the atmosphere such as COx, NOx, SOx and soot. These gases directly influence the aggravation of the greenhouse effect, cause acid rain and decrease the air quality we breathe. To reduce SOx emissions to the atmosphere, for example, sulfur concentration in Brazilian mineral diesel is currently limited to 10 ppm, according to CONAMA Resolution 403/2008. This ultra low sulfur diesel (ULSD) is also required in other countries. Another way used in Brazil to reduce emissions of air pollutants is the 10% volume mixture of biodiesel with mineral diesel consumed at gas stations. However, glycerin (a byproduct of biodiesel production) has become a problem for producers due to the large amount generated, where for every 100 liters of biodiesel produced, about 10 kg of glycerine results. The treatment process for sulfur reduction, oxygenated and nitrogenous compounds causes a decrease in lubricity in mineral diesel and lack of lubricity will affect engine performance such as accelerated wear, insufficient power, reduced service life, cause energy dissipation by friction and failure of parts such as fuel injectors and pumps. Therefore, in this work were developed microemulsionated mineral based diesel fuel ULSD systems with glycerine solution and two non Ephenylated ethoxylated surfactants with 4 EO and 6 EO that were able to harness the energy potential of glycerin, promote improvement in diesel properties and reduce emissions. of pollutants. Firstly, an experimental factorial design of type 23 was developed to identify the most influential variables in the process, as well as the optimal value ranges. Seven fuel systems were determined with the aid of a previously elaborated pseudo-ternary diagram, namely: mineral diesel S10 (white of the experiments) and six formulations with a fixed surfactant concentration of 0.11 g R4 / R6 / mL diesel and with quantities of 15% glycerine solution added to each system ranging from 0 to 0.10 g / mL diesel in 0.02 g / mL increments. The thermogravimetric analysis suggested similar profiles for the different formulated fuels and the addition of surfactants R4, R6 and glycerine solution 15% increased the maximum decomposition and burning temperatures. All microemulsion fuel systems presented similar activation energies, calculated by the Ozawa – Flynn – Wall (OFW) method, of the order of 60 kJ / mol and when compared with the activation energy value of mineral diesel S10, A reduction of about 6 kJ / mol is obtained. The reduction in activation energy of these fuel systems suggests a reduction in ignition delay, improved burn and emission reduction when used in engines. In the lubricity tests developed in the HFRR (Hight Frequency Reciprocating Rig) it was observed as general behavior, an increase of the formation of the lubricating film, a decrease of the coefficient of friction and a reduction of the eschar formed in the balls. The best results were: double the percentage of lubricating film formation, 0.053 reduction in the coefficient of friction and 187 µm reduction in the size of the eschar formed when comparing the formulation with higher amounts of additives with the mineral diesel S10. The results of specific consumption tests for the different microemulsed fuels performed on a BD 7.0 engine at a fixed speed of 3500 rpm and six power load conditions show that increasing the water and glycerin concentration in the systems increased the consumption. of fuel at a specific load but this consumption becomes almost equal under the conditions of higher power loads. As for the analysis of CO, CO2, NOx and Gas Exit Gas emissions, the overall behavior was to reduce CO emissions and increase CO2 and NOx emissions and increase the gas exit temperature, when All power loads tested for S10 mineral diesel are analyzed. But for an analysis of each specific load, the behavior of reduction of CO, CO2, NOx emissions and Gas outlet temperature can be observed, being obtained in the best condition a reduction 19%, 5%, 11% and 10, 5% respectively.

16
  • MAYARA DE OLIVEIRA LESSA
  • Flash pyrolysis of different Elephant Grass (Pennisetum purpureum Schum.) biomass cultivars
  • Líder : MARCUS ANTONIO DE FREITAS MELO
  • MIEMBROS DE LA BANCA :
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • EMERSON MOREIRA DE AGUIAR
  • JANDUIR EGITO DA SILVA
  • YARA FELICIANO GOMES
  • Data: 16-dic-2019


  • Resumen Espectáculo
  • Elephant Grass (Pennisetum purpureum Schum.) has a high yield with an annual capacity of 40 tons of dry matter per hectare (Woodard & Prine, 1993; Somerville et al., 2010), and an energy yield up to 25 times higher than energy consumed in its production (Collazzo et al. 2017). In this work a study on different cultivars of Elephant Grass (Pennisetum purpureum Schum.) was carried out. The cultivars tested were (Pennisetum purpureum Schum.) cv. Mott (MEG), (Pennisetum purpureum Schum.cv. Roxo (REG) and (Pennisetum purpureum Schum.cv. Capiaçu (CEG). The biomasses were evaluated in terms of Proximate analysis, Calorific Value, Ultimate Analysis, Structural Composition, Thermogravimetric Analysis, FRX, DRX, FTIR, flash pyrolysis at 600 ° C in Py-GC/MS and the evaluation of kinetic parameters by thermal analysis. The kinetic parameters of the samples were evaluated using Flynn-Wall and Model Free Kinetics (Vyazovkin) non-isothermal methods for the degradation range of holocellulose (hemicellulose and cellulose) from 150 to 370 ° C. The methods fit well with the MEG and REG samples. However for CEG, the models with linear fit proved to be unreliable to describe the kinetic parameters of the sample. The volatile compounds produced in pyrolysis were mainly oxygenated, including short chain oxygenated compounds (C1-C4), furans, esters, aldehydes, ketones and phenols. In general, the results obtained were similar for the three biomasses with only small variations in the yields of pyrolysis products. However, because it has a higher growth height, a HHV (16.22 MJ/kg) and one of the highest phenol contents, the CEG proved to be the most promising biomass to be studied for energy application among the other samples.

17
  • JOSÉ WAGNER ALVES GARRIDO
  • Study of biodegradable flocculants and bioadsorbers derived from Moringa Oleifera as alternatives for treating produced water.

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • RENATA MARTINS BRAGA
  • ANITA MARIA DE LIMA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • JANDUIR EGITO DA SILVA
  • MARCELO MENDES PEDROZA
  • Data: 27-dic-2019


  • Resumen Espectáculo
  • In the petroleum industry, in the segment represented by petroleum extraction, the most relevant pollutant, is the water produced, due to their complex chemical composition of contaminants and quantity generated that can vary considerably. The inadequate discard of this wastewater implicate environmental damage, penalties and negative repercussion on producing companies, contrary to environmental legislation present. In this context, the flotation technique has been quite used in the treatment of this effluent, in order to reduce the

    Content of oils and greases, associating the pretreatment stage operation of flocculation. In order to improve the final quality of this effluent, is it necessary to have another phase of post-treatment, which can be the use of activated carbon adsorption processes, that has been

    widely studied, to remove dissolved part of oil which has in its composition monoaromatic hydrocarbons such as benzene, toluene, ethylbenzene and xylene. In this case, this research proposed to perform the treatment of synthetic wastewater with flocculation/flotation technique and adsorption by activated carbon, with the combined application of flocculation/ flotation dissolved air, using natural flocculants obtained from the seeds of the plant Moringa oleifera. Such flocculants were obtained by protein fractionation with ammonium sulfate extractant, that went called of crude extract, fraction 1, fraction 2 and fraction 3. And for the adsorption study were used three types of carbons by-products obtained from this plant, being coal in-natura, which was chemically activated in two ways, employing the phosphoric acid and ammonium hydroxide reagents. The main techniques and the parameters considered to characterize such coals were: hydrogen potential, point of zero charge, basic and acidic functional groups, thermogravimetric analysis, differential thermogravimetric, x-ray diffraction, x-ray fluorescence, scanning electron microscopy and infrared spectroscopy. The experiments of removal of oils and greases with combined technique flocculation/flotation were performed according to factorial and central planning, through which he statically verified the influence of process variables for the three flocculants: flocculant concentration and flotation time. From the adsorptive and equilibrium study, it was found that fresh coal

    presented removal efficiency about 79.33% and the maximum benzene adsorption capacity was 65.07 mg.g-1, values considered high when compared to other adsorbents. While, the chemically activated carbons presented removal efficiency of 51.56 and 84.61% and maximum adsorption capacities of 50.59 and 78.89 mg.g-1, respectively, with similar equilibrium time of 20 minutes. The natural flocculants produced presented potential for removal of oil and grease, to the point of reach the environmentals requirements for discard this effluent in natural bodies of water. The rapid removal of benzene and the range of the equilibrium in a short period of time, when compared to other precursors, these results may be indications that flocculants and adsorbents of Moringa oleifera are viable and efficient, and can constitute a promising alternative or the treatment of industrial effluents, making the process more economical.

2018
Disertaciones
1
  • MARIA BIANCA MEDEIROS DE MELLO NOBREGA
  • "Optimization of a real crude oil atmospheric distillation process using process simulation and statistical methods"

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • DANNIELLE JANAINNE DA SILVA
  • KALYANNE KEYLY PEREIRA GOMES
  • OSVALDO CHIAVONE FILHO
  • Data: 05-ene-2018


  • Resumen Espectáculo
  • The increasing global demand for energy has caused a rise in energy prices and has required the search for techniques that enhance the efficiency of processes in industries. Furthermore, in the environmental context, increasing energy efficiency plays a key role in reducing greenhouse gas emissions, contributing to sustainable development. This work was developed with the objective of optimizing the energy consumption of the top condenser of an atmospheric petroleum distillation tower, installed in one of the largest refineries in Brazil. The optimization consisted in the determination of optimum conditions for the stripping steam and feed temperature, which minimize the condenser energy consumption, according the product specification requirement and the equipment operational limits. The working methodology developed includes the steps of modeling, sensitivity analysis, factorial design and Response Surface Method (MSR). This was possible with the aid of the commercial simulator Petro-SIM® and the softwares STATISTICA© and Excel®. The results demonstrate that the refinery operates at operational conditions close to optimum values, but significant gains can still be reach by adjusting the stripping steam flowrate and feed temperature. The change in the steam flowrate to 280.00 t/d and the feed temperature to 363.64°C can generate a reduction of 0.81% in the overall thermal load and a monthly savings of R$ 341,733.00. It is also worth mentioning a monthly reduction of 2,148m³ of water for the production of steam. Thus, in addition to the possibility of real gains, this methodology developed from existing methods is able to be an optimization tool to improve energy efficiency, even in complex processes such as petroleum distillation.

2
  • SARAH NATACHA DE OLIVEIRA ALMEIDA
  • "CO2 CAPTURE IN MULTICOMPONENT MIXTURE USING MICRO-REACTOR"

  • Líder : JACKSON ARAUJO DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • FRANCISCO WENDELL BEZERRA LOPES
  • JACKSON ARAUJO DE OLIVEIRA
  • JOSÉ ROBERTO DE SOUZA
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 05-feb-2018


  • Resumen Espectáculo
  • The natural gas associated with the oil extracted from the pre-salt layer presents expressive CO2 contents (> 30 mol%), which makes it unfeasible to commercialize directly from the platforms, so that the gas must be removed at least to the maximum concentration (3 % molar) required by the ANP to make it profitable. The microreaction system has reached great interest in the last decades due to the intensification of the process. In this configuration, the process occurs continuously, with the reactions and the transfer phenomena occurring in the individualized form with maximum gradients. A feature to be highlighted in these reactors, compared to conventional chemical reactors, is the higher surface area / volume ratio, which favors a higher yield, selectivity and energy efficiency of the reaction. The evaluated microreactors are formed by microchannels with square cross-section with hydraulic diameter between 0.28 to 1.5 mm. The microreaction system consists of pumps, valves, pressure and temperature sensors, microreactor and a microsseparator. The gas-liquid mixture occurs in the microreactor at atmospheric pressure and ambient temperature, and then is separated in the microsseparator, the gas in turn is directed to a gas chromatograph to check the percentage of absorbed CO2. In this work, the CO2 absorption process in water and amine (MEA) was studied in different types of microreactors (T-system, funnel type microreactor, T-type microreactor and microreactor T-junction) and evaluated different compositions for the gas phase with N2, CO2 and CH4). Also, experiments were performed under operational conditions with different gas / liquid volumetric ratio values. In general, the flow regime was slug-like, and the results indicated that the maximum CO2 removal efficiency using the T-junction microreactor occurred with removal efficiency greater than 90% and gas / liquid volumetric ratio of 7:30 without MEA and was 100% for concentrations of MEA above 0.5 M in all gas / liquid volumetric ratios studied.

3
  • DEBORAH CORDEIRO DE ANDRADE
  • "Calcium, strontium and iron carbonates solubility under interest conditions in the monoethyleneglycol regeneration process".


     



  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • CAMILA GAMBINI PEREIRA COURTIAL
  • ITALLA MEDEIROS BEZERRA
  • OSVALDO CHIAVONE FILHO
  • Data: 20-feb-2018


  • Resumen Espectáculo
  • The oil industry is constantly facing problems related to the exploitation of natural gas. During its production, fouling may be formed as, for example, gas hydrates, once the produced water is full of dissolved salts, thus blocking a passage of the fluid through the pipeline and also causing a corrosion of the production tubes. This occurs with changes in the temperature and pressure of the circulating fluid. As a way of solving this problem, chemicals are added to the drilling fluid. Monoethylene glycol (MEG) consists of a hydrate inhibitor widely used because it does not harm the environment, provides a low operating cost since it can be regenerated and chemically compatible with the constituents of the production fluid. In order to study interest conditions for MEG regeneration process, procedures and experimental apparatus were developed to promote data whose inhibitor effect together with sodium chloride effect, temperature, CO2 partial pressure and pH in aqueous mixtures containing carbonate salts, such as, calcium, strontium and iron, in excess, were described. CO2 partial pressures ranged from 760 to 1610 mmHg, temperature ranged from 5 to 50 °C, MEG concentrations swept the entire percentage range of mass percentage and sodium chloride was added at three concentrations: 1, 3 and 5 % in weight. A modified analytical method has been specifically developed for the system in which there is bubbling of carbon dioxide. Through the data analysis, it was possible to conclude that increasing temperature and MEG concentration provide a decrease in carbonate salts solubility. It was also found that carbonate salts concentration increases with the increase in CO2 partial pressures and with NaCl presence NaCl up to 3 % in weight, since once its concentration becomes higher, 5 % in weight, the effect becomes reverse. A thermodynamic approach was applied in phase and chemical equilibria. In this modeling it was possible to quantify the MEG addition effects and carbon dioxide as well as the temperature on the carbonate salts solubility under study.

4
  • MARCOS ANTONIO OLIVEIRA FILHO
  • "Recuperation and partial purification of antigen 503 of Leishmania i. chagasi from recombinant E. coli M15 and simultaneous LPS removal using Aqueous Two-Phase Systems"

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • LUCIANA IGARASHI MAFRA
  • Data: 21-feb-2018


  • Resumen Espectáculo
  • The antigen 503, a protein found in the amastigote phase of Leishmania i. chagasi, can integrate vaccines and specific diagnosis assays for visceral leishmaniasis (VL). However, a problem on the protein purification is the presence of endotoxins (LPS), natural compound of bacterial expression systems, which triggers immune response in human body and interacts with the proteins impairing possible chromatography steps. To solve this problem, Aqueous Two-phase Systems (ATPS) can be employed with the advantages of eliminate clarification steps on the whole process, indeed it also concentrates the molecule of interest and reduces the concentration of LPS, preparing the product for a more efficient adsorption in the following steps. Thus, the present work aimed evaluate ATPS based on PEG1500/Salt, Ethanol/Salt (K2HPO4 and (NH4)2SO4) and Acetonitrile/Dextrose on the partial purification of antigen 503 expressed in recombinant E. coli M15 and simultaneous removal of LPS. For that, firstly, binodal curves of these systems were constructed by cloud point titration method at room temperature (25 ± 2 ºC). The parameters of the equation purposed by Merchuk were calculated by these experimental data and the Tie-Line Lengthes (TLL) were obtained. Generally, the TLL rose with an increase of the concentration of organic solvent. When the cell homogenate from E. coli was applied, the system which exhibited the best results was 30% PEG1500 and 10% K2HPO4 (m/m) achieving 116,96% of recuperation and 1,55 of purification factor (assay P3). The removal of endotoxins was promising for all the systems evaluated, as it was kept above 90,0%. The assay P3 also stood out for the LPS removal, being able to remove 99,90%. Thus, ATPS can be a precedent step to the chromatography for the removal of high LPS concentration and grow the purity of recombinant proteins from E. coli.

     

5
  • VITOR TROCCOLI RIBEIRO
  • "Evaluation of the pQE-30 plasmid stability and expression of 503 antigen of Leishmania i. chagasi in Escherichia coli M15 at different concentrations of IPTG and culture temperatures."

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • MICHELLE ROSSANA FERREIRA VAZ
  • Data: 23-feb-2018


  • Resumen Espectáculo
  • Visceral leishmaniasis is an infectious-parasitic disease caused by protozoa of the genus Leishmania, which can be lethal when there is no adequate treatment. It is estimated that there are 12 million people infected by the disease, but unfortunately there is no vaccine capable of preventing the disease. In addition, the treatment of the disease presents high cost and high toxicity. Therefore, we must highlight the research of purified antigenic components that can be used as a tool to obtain vaccines or tests for specific diagnosis. In this context, the present work aims to evaluate the influence of the concentration of IPTG during the induction and the influence of culture temperature on 503 antigen expression and on the stability of plasmid pQE-30 in Escherichia coli. All assays were performed in a rotary incubator and made in duplicate. First, IPTG induced cultures were carried out at concentrations of: 0.01 mM; 0.1 mM; 0.5 mM; 1.0 mM and 1.5 mM at 37 °C. The concentration of the inducer did not affect the stability of the plasmid and when induced with 1.0 mM, the 503 antigen expression was maximal 0.101 ± 0.004 g / L. It was possible to verify that the lowest concentration of IPTG used was enough to achieve expression of the recombinant protein. Thereafter, the concentration of IPTG was fixed at 1.0 mM and the cultivation temperatures of 27, 32 and 42 °C were evaluated. These assays were compared with the previous assay performed at 37 °C. Temperature influenced the stability of the plasmid, and the lower the culture temperature, the greater the stability. According to the results, the temperature of 37 °C obtained the highest expression of 503 antigen, being considered therefore, the optimal conditions for 503 antigen production in a rotary incubator.

     

6
  • LUAN TALES COSTA DE PAIVA VASCONCELOS
  • "Induction strategies of the recombinant 503 antigen of Leishmania i. chagasi expressed in M15 Escherichia coli"

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • ANDREA FARIAS DE ALMEIDA
  • NATHALIA KELLY DE ARAUJO
  • Data: 23-feb-2018


  • Resumen Espectáculo
  • With nearly 900,000 to 1.3 million new cases annually, Leishmaniosis is a complex of diseases that can be fatal if not given proper attention. Despite its relevance in the public health system, there is no vaccine capable of preventing disease in humans so far, and its treatment is expensive and aggressive to human health. Vaccination remains the most practical and realistic way of fight against the disease, thus, the production of recombinant antigens as a pathway towards a vaccine acquisition is necessary. In addition, the optimization of the strategy of the recombinant antigen’s production is of interest so it can make the process viable. Therefore, the present study aims to optimize the induction parameters of the 503 Leishmania i. chagasi antigen expressed in recombinant Escherichia coli. Hence, the induction at different cell densities (optical density at 600 nm of 0.5 and 1.0) was evaluated in order to analyse the influence of the induction time on the yield of the protein of interest. In this segment, lactose and isopropyl-β-D-thiogalactopyranoside (IPTG) were used as inducer molecules, using various concentrations: 0.1 g/L, 1.0 g/L and 10 g/L for lactose and 20 μM, 100 μM, 500 μM and 1000 μM for IPTG. The results presented that the concentration of IPTG that obtained the higher antigen levels was that of 100 μM (0.087 g/L), a 10-fold lower concentration than was being previously used in this type of system, and for lactose it was 1 g/L (0.016 g/L). Thus, the induction with 100 μM of IPTG allowed to obtain the antigen with a concentration 5.6 times higher than the lactose induction maximum concentration.

     

     

     

7
  • MILLENE CAROLINE ALBINO DE OLIVEIRA
  • “STUDY OF THE ENHANCED OIL RECOVERY VIA INJECTION OF THE RHAMNOLIPID BIOSURFACTANTE PRODUCED FROM PSEUDOMONAS AERUGINOSA”

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • VANESSA CRISTINA SANTANNA
  • FRANCISCO KLEBSON GOMES DOS SANTOS
  • JOSELISSE SOARES DE CARVALHO SANTOS
  • Data: 23-feb-2018


  • Resumen Espectáculo
  • The continuous need for increased production of hydrocarbons makes the development of techniques to produce more oil from reservoirs a matter of fundamental importance. In that context, the enhanced oil recovery (EOR) through surfactant flooding works by lowering the interfacial tension between water and oil, improving the displacement of the latter out of the reservoir. The present work aims to characterize the rhamnolipid biosurfactant, produced from a strain of the Pseudomonas aeruginosa bacteria, and to assess its utilization in the EOR process. The rhamnolipid characterization involved the determination of its critical micelle concentration (CMC), and also the behaviour caused by the influence of pH and salinity over it. The EOR process included three oil samples, with API degree range of 25-30, and three biosurfactant concentrations, of 30, 50 and 100% above the cmc. The results demonstrated that biosurfactant flooding not only presents itself as a sustainable alternative to synthetic surfactants by being biodegradable, but is also capable of successfully increase the recovery factor of the oil production process post water injection, presenting a range of enhanced recovery factors from 2.5 up to 9.3%, where the best results were achieved for the more viscous oil samples and for higher rhamnolipid concentrations.

8
  • JACIARA SILVA DE ARAÚJO
  •  "Production of rhamnolipids by Pseudomonas aeruginosa P029-GVIIA using glucose as substrate and applications"

     




  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • ANDREA FARIAS DE ALMEIDA
  • EDUARDO LINS DE BARROS NETO
  • EVERALDO SILVINO DOS SANTOS
  • LEANDRO DE SANTIS FERREIRA
  • Data: 26-feb-2018


  • Resumen Espectáculo
  • Biosurfactants are amphiphilic compounds of microbial origin, which have aroused as an alternative to the use of chemical surfactants once its use is very aggressive to the environment. On the other hand, biological surfactants have properties similar to the chemical surfactants and also have some advantages over them such as biodegradability, stability in different pH, temperature and salinity conditions, and low toxicity. In face of this situation, several studies have been developed in order to make the production of biosurfactants viable for commercialization. The most researches aims to analyze the production of these compounds using different renewable sources and investigate their surfactant properties. The rhamnolipids, that are biosurfactants produced by bacteria and belonging to the group of glycolipids, are applied in several industrial areas due to its various properties as emulsifying, solubilizing, wetting, so on. Thus, this work aims to verify the production of rhamnolipid by Pseudomonas aeruginosa P029-GVIIA, changing the following parameters: the concentration of glucose (10, 18 and 26 g / L) and the inoculum percentage (3, 10 and 17%) for 72 hours. Along this time the cell growth (X), the glucose concentration consumed (S), the produced rhamnolipid (P), the pH of the system and the production of total proteins were assessed. Five trials were performed and the best condition (26 g / L glucose and 3 ml inoculum) produced 0.838 ± 0.064 g/ L ramnolipid in 24 hours, biomass conversion factor in product (YP/X) of 0.260 g/g, substrate conversion factor in product (YP/S) of 0.034 g/g and product productivity (PP) of 0.021 g/L∙h. At this assay, the biomass reached the highest value among all cultures (2.5 ± 0.041 g/L), pH ranged from 5.8 to 8 and substrate consumption reached 82.45% at the end of the experiment. From the best outcome, there were studied the emulsification index and the emulsifying activity with six different solvents: kerosene, hexadecane, toluene, soybean oil, corn oil and motor oil. The last one presented the best responses with emulsification index of 77.55% in the first 24 hours and high emulsifying stability, 2.23 U. Then, the efficiency of the biosurfactant in the removal of oil present in sand was evaluated in 16.8% and the antimicrobial activity of the ramnolipid against different bacterial and fungal species were determined, showing its ability to inhibit fungi of the species Candida tropicalis and Candida albicans. In this way, the results obtained prove the potential of the rhamnolipid produced for biotechnological applications.

9
  • DANIEL DE ARAÚJO COSTA RODRIGUES
  • "Bayer Process Gibbsite Autoprecipitation Process Modelling in Thickeners"

     

     

     

     


  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JACKSON ARAUJO DE OLIVEIRA
  • JOSÉ ROBERTO DE SOUZA
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 05-mar-2018


  • Resumen Espectáculo
  • Most Bayer refineries monitor carefully alumina losses. One of the prominent effects that cause it is auto precipitation in the clarification circuit. This document proposes a conceptual model for the representation of the process nuances, considering settler solids profile and composition, and the uneven fluid flow behavior of a vessel of this type.

    The model consists in discretization of decanter zones and representation of mixing, reaction, and splitting. It is proven to be at zero degrees of freedom independently of the composition detail on liquor and solids composition through a generalized degrees of freedom analysis for an undefined number of components and stages. The effect of model parameters such as number of stages, feed stream position, and mud bed level on the model response and stability is analyzed so to propose an ideal range of numerical modelling conditions.

    The proposed model did not show multiple steady states and attains results that are in accordance with reality. Additionally, the impact of the number of discretization does not add to the model capacity, in fact it is detrimental to it by adding numerical instability.

10
  • LUIZ EDUARDO PEREIRA SANTIAGO
  • "Modeling and Simulation of Tubular Reactors Filled with Inerts"

  • Líder : JACKSON ARAUJO DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • JACKSON ARAUJO DE OLIVEIRA
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • SEBASTIAO RIBEIRO FERREIRA
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 09-mar-2018


  • Resumen Espectáculo
  • The continuous process of transesterification at supercritical conditions in tubular reactors rises as a new technology that will ensure viable large-scale biodiesel production. The idiosyncrasies of this process are related to the simplified separation processes, use of low quality feedstock, catalyst free and short reaction time (compared to the conventional processes). In these types of studies, the recent breakthroughs demonstrate that an inert bed (mixing promoters) may be a feasible alternative to enhance tubular reactor performance when operated at supercritical conditions. However, a rigorous phenomenological analysis of this new process layout is scarce in literature, which creates some limitations for a complete understanding of the process. Thus, the main objective of the current work is to develop a mathematical model of the process and analyze triglyceride alcoholysis at supercritical conditions using a continuous tubular reactor packed with glass spheres. The operating variables evaluated are temperature (300, 350 and 400°C), volumetric flowrate (0.5 mL/min and 1.0 mL/min) and bed porosity (0.42, 0.38 and 0.32). The experimental data were evaluated for the oil /alcohol molar ratio of 1:40 and operating pressure of 15 MPa. The model parameters were estimated using the particle swarm optimization algorithm (PSO), which is a classical heuristic optimization technique. The phenomenological characteristics were analyzed based on the description of multiple gradients along with the false-transient method. The results obtained by the model were able to predict 89% of the experimental data. The higher conversions in esters were achieved for the highest temperature and lowest porosity. Therefore, the use of inert bed intensified the ester production, decreased reaction time as well as the thermal degradation of esters.

11
  • MAXWELL GOMES DA SILVA
  • "Biodiesel production by oleic acid esterification in a bubble reactor: Experimental study and mathematical modeling."

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JACKSON ARAUJO DE OLIVEIRA
  • JUAN ALBERTO CHAVEZ RUIZ
  • RENATA MARTINS BRAGA
  • Data: 09-mar-2018


  • Resumen Espectáculo
  • Bubble reactors are widely used to carry out gas-liquid and gas-liquid-solid reactions at different operating conditions. This type of reactor is often used in chemical, biochemical and petrochemical industry for conducting processes like chlorination, oxidation and CO2 removal. A more recent application of bubble reactors is biodiesel production. In this process, superheated alcohol vapor is bubbled through a liquid phase containing triglycerides or free fatty acids. The alcohol, after being transferred to the liquid phase, reacts with the lipid feedstock to form mono alkyl esters (biodiesel) through esterification or transesterification, depending on the amount of free fatty acids and triglycerides in the lipid feedstock. A bubble reactor experimental apparatus was developed and used to conduct oleic acid esterification experiments by using superheated ethanol vapor operated in the semi-batch mode. The effects of gas volumetric flow rate and reaction temperature on fatty acid conversion was evaluated, as well as the bubble size influence on reactor’s performance. Additionally, a mathematical model was developed and implemented in MATLAB to describe the biodiesel production process in a semi-batch bubble reactor. Experimental conversion data were used to estimate the kinetic and mass transfer parameters, as well as to validate the proposed model. The effects of mass transport followed by chemical reaction were evaluated by using the validated model to simulate the process at different operating conditions.

     

12
  • BRENO DA SILVA ROCHA
  • "Evaluation of a combined surfactants and polyelectrolytes methodology for produced water treatment."

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • DAMILSON FERREIRA DOS SANTOS
  • EDUARDO LINS DE BARROS NETO
  • LEDA MARIA OLIVEIRA DE LIMA
  • Data: 02-abr-2018


  • Resumen Espectáculo
  • The ever-greater development of alternative energy sources in substitution to petroleum-derived fuels has forced this industry to optimize its costs, while keeping health, insurance and environment focus. Due to the high produced water rates in mature onshore fields, the reduction of chemicals while treating this residue provides important financial savings perspective to oil industry. The present study aims to evaluate the synergistic effect of the combined use of a conventional tanine based polyelectrolyte in association with a coconut oil derived surfactant, to better use locally available resources for produced water treatment. Due to produced water intrinsic instability, a method for producing stable oil in water emulsion (with ~50 mg/L of grease and oil content) was developed. Samples were subject molecular absorption analysis in visible region and compared to a standard built with solvent and oil. Chemical treatment’s efficiency were evaluated on jar-tests with controlled stirring basis’. Treatment with only polyelectrolyte presented results in good agreement with literature, where 40 mg/L were able to withdraw 81 and 85% of the oil content of the produced water residue, fully meeting law requirements. Treatment using only the coconut oil surfactant was able to achieve this level of treatment only with 200 mg/L of active matter, providing 86% efficiency. Combined polyelectrolyte and surfactant treatment managed to produce greater efficiency than isolated methods (92%) by using 20 mg/L of the polyelectrolyte and 100 mg/L of the surfactant. It was verified the dependency between tested variables (concentration and efficiency) by the use of deviation analysis (F-test) with 95% confidence. Therefore, it was possible to observe that the combined use of both products could lead to financial savings in produced water treatment while maintaining process sustainability and providing economic use for locally available low cost surfactants.

13
  • JOÃO OCTÁVIO MEDEIROS PIRES
  • Synthesis, characterization and evaluation of photocatalytic potential under visible light of Ce2(MoO4)3/TiO2 composite.

     

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLSON PEREIRA DE SOUZA
  • ANDRE LUIS LOPES MORIYAMA
  • JOAO BOSCO LUCENA DE OLIVEIRA
  • GILSON GARCIA DA SILVA
  • Data: 17-abr-2018


  • Resumen Espectáculo
  • Ce2(MoO4)3/TiO2 composites (cerium molybdate and titanium dioxide) with different compositions were prepared by combined complexation method EDTA/Citrate and by the wet doping method. The obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). The material catalytic potential was evaluated by spectrophotometry, in which the dye concentration variation (Maxilon Blue and Erionyl Yellow at 10ppm) was evaluated in a reactor with 30, 60, 90 and 120 minute batch reaction at 45ºC, pH = 6, with visible light incidence and 200mg / L of catalyst. According to the results of the XRD, it was verified that the obtained compounds presented the expected phases. Through the images of the SEM it was possible to observe that there was a change in sizes and formats of the base material (TiO2) due to the incorporation of the cerium molybdate. It was also verified through SEM that the material was not homogeneous for the wet doping method done with 10%. The EDS results confirmed the presence of elements that were used to form the final compound and presented a deviation of 2.3-5.7% between the theoretical and the experimental composition, justified by the synthesis and doping method. By the ERD analysis, it was certified that there was no significant change in the bandgap of the base material (TiO2) when introducing Ce2(MoO4)3. Commercial TiO2 was used as comparison basis for the photocatalysis tests. The photocatalytic potential was evaluated according to base points, considering photolysis, adsorption and photocatalysis, thus requiring tests with and without light. For the yellow acid dye (Yellow Erionyl) the photolysis was not significant, the material obtained values of up to 25% of adsorption and obtained as best photocatalyst the 5 wt% Ce2(MoO4)3/TiO2 obtained by impregnation, which caused 42% remotion. For the basic blue dye (Maxilon Blue) there was photolysis of up to 27% in 120 minutes, it obtained the best results of adsorption and degradation when used with the base material, reaching 67.7% and 94.67% respectively at the end of 120 minutes.

14
  • JULIENE DA CÂMARA ROCHA
  • Production, stability and application of pectinolytic enzymes from Aspergillus niger IOC 4003 using tropical residues of fruits as substrate

  • Líder : GORETE RIBEIRO DE MACEDO
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • GORETE RIBEIRO DE MACEDO
  • SHARLINE FLORENTINO DE MELO SANTOS
  • Data: 17-jul-2018


  • Resumen Espectáculo
  • At the last decades, it has increased significantly the demand for microbial enzymes on biotechnological applications. The pectinolytic enzymes, responsible for cleaving both pectin and other pectic polysaccharides in galacturonic acid residues, have application in several sectors such as fruit and wine juice processing, recovery of essential oils, extraction of vegetable oils, as well as the textile and food industries.paper and cellulose. In this context, the aim of this work was to evaluate the production, stability and application of pectinolytic enzymes by Aspergillus niger IOC 4003 using acerola and cajá residues as solid state fermentation substrate (SSF). Initially, residues of acerola and cajá, washed and unwashed, were submitted to drying and determined their chemical and physicochemical composition. The percentage of calcium pectate, pectin indicator, found in residues was 3.46 ± 0.11%; 2.94 ± 0.18%; 5.85 ± 0.01% and 5.34 ± 0.23% for unwashed acerola, washed acerola, unwashed cajá and washed cajá, respectively. Then, the potential of these substrates as inductors for the production of pectinolytic enzymes by FES was evaluated during 240 h with initial pH of 4.5; humidity at 40% and spore concentration of 1 x 107 spores / mL. In the fermentation stage, the greatest polygalacturonase production was observed using washed cajá residue reaching enzymatic concentration of 38.22 ± 0.63 U / g in 72 h of cultivation. Next, the optimization of enzyme extraction was studied and the best condition of extraction occurred using contact time of 30 minutes and acetate buffer at concentration of 50 mM and pH 5.4. On subsequent step, the stability of enzyme complex was evaluated against temperature and pH. The best condition on stability of polygalacturonase occurred at temperatures of 30 and 40 ° C, and among pHs 4 and 6 for up to two hours of incubation. Thus, the synthesized enzymatic extract by Aspergillus niger IOC 4003 from washed cajá or unwashed acerola residue was applied in the process of clarifying cajá juice. In the clarification stage, the outcomes that stands out were 40% reduction in turbidity, 30% of clarification and 85% increasing of antioxidant capacity of the juice. In this way, the present work demonstrates the feasibility of using fruit industry residues as substrates for production of interest enzymes and its application in food industry.

15
  • GABRIELA PAUPITZ MENDES
  • Tratability studies of naphthalene contaminated soil applying chemical oxidation: sorved, aqueous and vapor phases analyses


  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • ANDRESSA BASTOS DA MOTA LIMA
  • DOUGLAS DO NASCIMENTO SILVA
  • MARILDA MENDONÇA GUAZZELLI RAMOS VIANNA
  • OSVALDO CHIAVONE FILHO
  • Data: 23-jul-2018


  • Resumen Espectáculo
  • Soil contamination by polycyclic aromatic hydrocarbons (PAHs) is a worldwide discussed subject. Naphthalene (NAP) is a PAH and it is among the 16 priority pollutants listed by the United States Environmental Protection Agency (USEPA). Advanced oxidation processes can be applied for remediation of PAH contaminated areas through the use of chemicals such as persulfate. This oxidant can be activated by either alkaline medium or ferrous iron, among other forms. The aim of this work was the evaluation of treatability experiments using chemical oxidation in a sandy soil artificially contaminated with naphthalene. Solid-liquid and liquid-liquid extractions were performed for sorbed and aqueous phases, respectively, according to USEPA methods. The collected samples were analyzed by gas chromatography coupled with mass spectrometry (GC-MS). The vapor phase was also collected and analyzed in the GC-MS. According to the factorial design applied, 2³ + 3 central points, the reaction optimum conditions were: [PS] = 18.37 g L-1; [FeSO4] = 4.25 g L-1; and pHinitial = 3.00. 82.61±1.19% of NAP removal was achieved. More than 60% of the NAP in the system was transferred to the vapor phase at the beginning of the process. At the end of the reaction, more than 99% of NAP in the vapor phase was removed. Regarding to the NAP concentration in the soil, it was possible to reach levels below the intervention value stipulated by the Environmental Company of São Paulo (CETESB).First order reaction fit accurately the kinetic series of experimental data, indicating that degradation time is directly proportional to the NAP concentration in the system
16
  • LUANA RABELO HOLLANDA
  • STUDY OF ATRAZINE PESTICIDE DEGRADATION THROUGH COPPER REDUCTION IN VALENCIA ZERO, AND OF ITS POTENTIALITY AS A PRE-STEP TO PHOTO-OXIDATION WITH PERSULFATE
     

     

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • OSVALDO CHIAVONE FILHO
  • ANDRE LUIS NOVAIS MOTA
  • ANDRESSA BASTOS DA MOTA LIMA
  • CÁTIA ALEXANDRA LEÇA GRAÇA
  • Data: 30-jul-2018


  • Resumen Espectáculo
  • The contamination of waterbodies by pesticides that are resistant to conventional water treatment processes consists a serious environmental problem, making urgent the development of alternative technologies capable of degrading them. Among these pesticides is Atrazine (ATZ), which is of special concern due to its endocrine disrupting character, being classified as a priority substance to be monitored for water quality purposes in the European Union. Advanced oxidation processes (AOP) have been pointed as a promising technology against this kind of pollutant. However, as an organochloride, ATZ contains electron-deficient groups, making it more easy to reduce than to oxidize. Therefore, a pre-reducing step is preferred to an oxidative one for the removal of these class of contaminants. Given that, in this study was investigated the application of zero-valent copper as a reducing agent for the degradation of ATZ. Then, this was combined with a sulfate radical (SO4●-)-driven AOP. To study the influence of different operational conditions in the pre-reducing step, a Doehlert experimental design was followed. Then, the mineralization of the solution that presented the highest ATZ degradation was studied by varying the oxidant concentration – sodium persulfate (1, 5 and 10 mmol L-1) – and the UV source of radiation (UVC and UVA). During the oxidative stage, samples were collected after 30, 60 and 120 minutes of reaction. Toxicity assays with the microalgae Chlorella vulgaris and the bacteria Vibrio fischeri were performed with the samples that obtained the highest degradation and mineralization results after each step. For the pre-reductive stage, the Doehlert design showed that the best conditions are those that combine low pH and high copper concentration (>0.2% m/v). The oxidative step was then applied on the most degraded solution and about 70% of mineralization was achieved after 2 hours of reaction when 5 mmol L-1 of persulfate and UVC radiation were used. Regarding toxicity assays with C. vulgaris, the reduced solution was 30% less toxic than the parent-ATZ initial solution. For the test with V. fischeri, it was found that ATZ initial solution did not cause inhibitory effects, but a significant increase in toxicity was observed after the reductive step. For both organisms, it was verified that, among the three reaction times tested, the toxicity reached a minimum value after one hour of reaction of the pre-reduced solution with persulfate. However, for longer reaction times the toxicity has increased again, even though higher mineralization values were achieved. In this way, results indicate that a higher mineralization does not necessarily mean low toxicity and, therefore, additional studies are required to understand the relation between these effects.

17
  • DENNYS CORREIA DA SILVA
  • Treatment by microemulsion systems of sludge generated in oil water flotation.

  • Líder : AFONSO AVELINO DANTAS NETO
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • PEDRO TUPÃ PANDAVA AUM
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 31-jul-2018


  • Resumen Espectáculo
  • With the development and expansion of the oil industry, waste generation on a large scale also grows. Environmental contamination by oil and its products stands out as a problem of high impact and requires special care during production and waste treatment. In the effluent treatment stage aiming the removal of oil from water by flotation, a sludge is generated which presents itself as a great challenge of treatment for either disposal or a possible reuse viability. This work presents a treatment option for the flotation sludge (FS) through microemulsion systems involving saponified coconut oil (SCO) and the commercial demulsifier Dissolvan as surfactants. Residues of sludge flotation (87.64% oil, 8.09% water and 4.26% insoluble residues) obtained through soxhlet extraction, and of the flocculating agent applied were identified and characterized through X-ray diffraction (XRD), X-ray Fluorescence Spectrometry (XRF), Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Elemental Analysis (CHNO) and UV-Vis Absorption Spectroscopy. The presence of quartz (SiO2), calcite (CaCO3), pyrite (FeS2) and molybdenite (MoS2) was observed in the flotation sludge residue, while FRX confirmed the presence of these minerals by sulfur (35.48%), iron (28.16%) and residual cation fractions. Chlorine (56.12%), aluminum (17.71%), sulfur (6.93%) and cation residues were detected in the flocculating agent residue. These characterizations revealed the presence of minerals from the geological formations, corresponding to 20% of the mass of the sludge residue as indicated by the thermogravimetric analysis, while the analyzes of FT-IR, SEM and EDS showed similarities between the residues of the two samples. Moreover, the CHNO and UV-Vis Absorption Spectroscopy analyzes identified the flocculant agent residue as a condensed tannin because of the number of components and similarities between the absorption spectrum of a sample of condensed tannin extracted from the Ipomea pes-caprae plant. In addition, an optimization process for solubilization of FS was evaluated using a microemulsion system (MES) containing SCO as surfactant, n-butanol as cosurfactant, aviation fuel as the oil phase and NaCl 2% salt water as the aqueous phase solution. Winsor systems were obtained, and microemulsion phases were characterized at room temperature (25°C) by analyzing visual appearance, particle size, zeta potential, surface tension, pH, electrical conductivity and small angle X-ray scattering (SAXS). The optimization of the use of microemulsion phases of WII and WIV systems in the sludge solubilization was evaluated through a central composite rotatable design (CCRD) at two application points: Winsor II rich in water and Winsor IV rich in oil. The microemulsion phases of these points were applied in order to investigate and estimate possible factors that may increase the solubility efficiency of the sludge, having as variables MES/FS ratio, temperature (°C) and time (min). From the data obtained for the two points, it was verified that the values acquired for the solubilization efficiency (ES) were, in almost all the tests, greater than 90%, excepting the tests in which the solubilization time and the MES/FS ratio were very low, and thus efficiency values ranged from 70-80%. The microemulsion system containing Dissolvan as surfactant revealed to have higher solubilization capacity (93.36% for WII rich in salt water and 95.79% for WII rich in oil phase) compared to the SCO system (91.89% for WII and 95.6% for WIV), which validates its use in the treatment of microemulsion flotation sludge.

18
  • KARYN NATHALLYE DE OLIVEIRA SILVA

  • TREATMENT OF SOIL CONTAMINATED WITH Pb EMPLOYING REMEDIATION ELECTROCYTETICS AND REACTIVE BARRIERS



  • Líder : ELISAMA VIEIRA DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • CARLOS ALBERTO MARTINEZ HUITLE
  • DOUGLAS DO NASCIMENTO SILVA
  • ELAINE CRISTINA MARTINS DE MOURA SANTOS
  • ELISAMA VIEIRA DOS SANTOS
  • VITOR JORGE PAIS VILAR
  • Data: 01-ago-2018


  • Resumen Espectáculo
  • The first part of this work examines electrokinetic remediation (ER) processes for removing Pb2+ in contaminated soils. For this purpose, different cathodic supporting electrolytes (NaNO3 0.1 M, EDTA 0.1M and citric acid 0.1 M) were used into the catholyte reservoir, while in the anodic compartment, a solution of NaNO3 0.1M was used. Additionally, the application of direct current (DC) and reverse polarity (RP) for removing of Pb2+ from the soil was also evaluated. Regarding to results obtained in this study indicated that RP and citric acid favored an efficient electromigration of Pb2+, favoring its elimination from the soil. This behavior can be explained because the elimination of Pb2+ depended on the dissolution/precipitation ionic species as well as the pH in the soil, which were maintaining in different sections in the soil, contributing to maintain the pH conditions, by using RP and citric acid, promoting the lead elimination. In order to use a feasible approach for monitoring Pb2+ concentration, adsorptive stripping voltammetry (AdSV) technique was used, obtaining acceptable confidence and good sensitivity for the concentration of Pb2+ with LOD about 0.1 mg L−1. Phytotoxicity tests showed that the ER process could be useful as a treatment technique for reducing hazardous soil toxicity polluted with Pb2+. The results confirmed the significant reduction of the germination in the anodic and cathodic regions for ER by applying DC with NaNO3 and EDTA as cathodic solutions. However, high germination (60–80%) was obtained for ER by using NaNO3 and citric acid solutions in cathodic compartments by applying RP or DC, respectively. Finally, the effluent generated by ER technology, in each one of experiments, was treated by electrocoagulation with Al electrodes, obtaining complete removal of Pb2+ from liquid after 60 min. The second part of this work studies integrated technologies for the treatment of soil, using ER with permeable reactive barriers (PRB). For this purpose, different cathodic supporting electrolytes (NaNO3 0.1 M, and citric acid 0.1 M) were used into the catholyte reservoir, while in the anodic compartment, a solution of NaNO3 0.1M was used. Additionally, the application of direct current (DC) and reverse polarity (RP) for removing of Pb2+ from the soil was also evaluated. The PRB used was made of cork with 2cm of thickness, 10cm of height and 10cm of length, located in the region near the anode. In order to use a feasible approach for monitoring Pb2+ concentration, adsorptive stripping voltammetry (AdSV) technique was used, obtaining acceptable confidence and good sensitivity for the concentration of Pb2+ with LOD about 0.1 mg L−1. The results obtained in this study indicated that the removal of Pb by adsorption in cork is influenced by the pH of the medium as observed in adsorption tests. The contribution of the addition of citric acid and RP contributed positively to the transport of Pb, avoiding precipitation in the form of Pb(OH)2. At the end of the 14 days, it was possible to observe that the integration of PRB and ER resulted in a higher removal efficiency (80%) associated to pH control in the cathode reservoirs.

19
  • TÂMARA SUELEN DA SILVA GONÇALVES
  • Development of polymeric drilling fluids based on microemulsions and evaluation of their properties.
  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • TEREZA NEUMA DE CASTRO DANTAS
  • MARCOS ALLYSON FELIPE RODRIGUES
  • KLISMERYANE COSTA DE MELO
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • Data: 14-nov-2018


  • Resumen Espectáculo
  • The use of drilling fluids ensures greater efficiency of oil drilling, as they perform a number of functions and are capable of profoundly influencing this process. The different types of drilling fluids and their applicability cause constant studies on their formulation. Thus, microemulsion systems (SME's) have been evaluated as a good proposal among the additives used in the formulation of these fluids. This work aimed to develop drilling fluids using microemulsions (ME's) oil in water, as well as to analyze their properties compared to the literature. For this, several SMEs were initially tested in order to find the one that presented a good ME region oil in water to prepare the fluid. The system found was composed of tap water and glycerin in the aqueous phase, Alkonat 70 nonionic surfactant and paraffin or olefin as the organic phase. From these systems, an experimental design was elaborated to evaluate the influence of the percentage of glycerin in the aqueous phase and the NaCl concentration in the properties of the drilling fluid, finding. an optimized fluid whose characterization was made later. The results showed that microemulsion fluids presented as an excellent alternative for drilling fluids, considering that their rheological properties were considered satisfactory even after the aging of the fluids, in addition to presenting very low filtration volumes.

20
  • ISABELLY PAULA DE SOUSA AZEVEDO HENRIQUES
  • Thermal characterization of goat and bovine whey protein by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).

  • Líder : CAMILA GAMBINI PEREIRA COURTIAL
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CAMILA GAMBINI PEREIRA COURTIAL
  • ROGERIA HELEN LIMA VIDAL
  • Data: 23-nov-2018


  • Resumen Espectáculo
  • Whey is a by-product of the dairy industry which has excellent nutritional, functional and physiological properties, associated with a high protein content. However, for it to be industrialized, it is necessary a complex treatment, limiting its use, especially for small farmers. As a consequence, whey is sometimes disposed inappropriately in the environment, causing environmental problems. β-lactoglobulin (β-Lg) and α -Lactalbumin (α-La) are the most abundant proteins in whey, their characteristics make possible their application in food products, mainly with the purpose of increasing the nutritional value and promoting functional characteristics. Although they are present in the whey of almost all ruminants, they can have variants from one species to another, conferring different characteristics according to the animal species. The study of thermal analysis of proteins has fundamental importance due to the influence of temperature on the behavior of proteins and their properties. The techniques of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) are some of the most used in the thermal study. Thus, the objective of the present study was to perform the comparative analysis of goat and bovine whey in natura, with emphasis on the thermal characterization of α-La and β-Lg proteins from goat and bovine whey in natura. For this, analyzes of physical-chemical characterization and thermal analysis of goat and bovine whey in natura were carried out. Thermal analysis was conducted using a simultaneously apparatus of analyzes of TGA and DSC with whey samples and solutions of standard proteins previously treated. The results obtained in this study demonstrated that the samples of whey of different origins have similar thermal behavior, with the existence of an endothermic process accompanied by an exothermic process and values of ,  e  close, 83,4±0,7, 106,3±0,7 e 62±2 J/g from caprine whey, respectively; e 82±3, 107±1 and 65±4 J/g from bovine whey, respectively; and  , 144±3 J/g and 151±3 J/g, from caprine and bovine whey, respectively. The non-frozen caprine whey had higher values of ,  e  when compared to the frozen caprine whey, 89±2 , 108 ±1 and 149±28 J/g, respectively.

21
  • GUILHERME MENTGES ARRUDA
  • Photocatalytic Conversion of Methane into Methanol: Equipment Development and Experiments.

     

     

  • Líder : ANDRE LUIS LOPES MORIYAMA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • Data: 29-nov-2018


  • Resumen Espectáculo
  • Due to increasing awareness regarding the environment, some gases
    such as methane have been extensively studied in order to have their usage optimized,
    aiming to reduce environmental impacts and the discovery of more noble
    applications. Given this context, photocatalysis emerges as an alternative for the
    conversion of methane into products with higher added value. The method of
    obtaining methanol from methane has several advantages, since methanol not only
    has a methane-like amount of energy, but also is easily transported and stored. This
    work searches for a viable alternative for the photocatalytic production of methanol
    from methane vapor reform, the development of a new system, as well as the
    evaluation of its operation and conversion efficiency. The system consists of a
    humidification column, an annular photocatalytic reactor, stainless steel screens
    coated with titanium dioxide, zinc oxide or tungsten trioxide and a condenser. The
    photocatalysts, deposited on the screens through methods that had been adapted from
    the literature, were activated with the aid of UV-A and UV-C emission lamps,
    arranged inside the reactor at different times. Oxides and supports were analyzed by
    scanning electron microscopy (SEM), X-ray diffraction (XRD) and diffuse
    reflectance spectroscopy (ERD) techniques, for evaluation of the homogeneity of the
    coatings and to ensure that the photocatalysts meet the process requirements. The
    photocatalytic tests were conducted at ambient pressure and temperature. As a result
    of the depositions, the photocatalysts presented an excellent distribution, confirming
    the adequacy of the technique used in relation to the purposes of the study. Although
    the system was operational, the products of the process, analyzed by gas and liquid
    chromatography, did not show any evidence of conversion under the experimental
    conditions.

22
  • LUCAS RAFAEL PINTO NOBRE
  • Modeling and Simulation of the CO2 Removal Process using Microrreator

  • Líder : DOMINGOS FABIANO DE SANTANA SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • DOMINGOS FABIANO DE SANTANA SOUZA
  • JOSÉ ROBERTO DE SOUZA
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 20-dic-2018


  • Resumen Espectáculo
  • With the continuous increase in the energy demand for natural gas and the growing concern
    with environmental aspects, mainly related to greenhouse gases, CO 2 capture became a
    target of relevance for research and industrial interests. The microreactors, in front of
    diverse options of application, have been emphasizing in the absorption of CO 2 . In this work,
    there was a study of microreactor modeling in the capture of CO 2 of a multicomponent
    mixture with characteristics similar to natural gas, composed of CH 4 , N 2 and CO 2 under
    atmospheric pressure and ambient temperature. A parameter estimation step was performed
    to correctly represent the mass transfer and chemical reaction phenomena. At first, the
    physical absorption, in which distilled water (H2O) was present as solvent, was evaluated. It
    was also verified the interference of a new component (CH4) in the absorption of CO2. The
    influence of variables such as gas velocity, liquid stream velocity, total flow and gas-liquid
    ratio were evaluated in several initial compositions. In a second moment, the chemical
    absorption of CO2 in experiments with different amine reagents (MEA, EtilEA and TEA) in
    H2O as solvent in several concentrations was analyzed. The phenomenological
    mathematical model was implemented in MATLAB® to describe and analyze the process.
    The parameters were estimated using the Interior Point Method. In the validation step of the
    mathematical model, mean absolute errors (MAE) of less than 2% were obtained, showing
    an excellent predictive capacity, which made possible a simulation and study of the process.
    It was observed that the addition of CH4 did not significantly alter the absorbed amount of
    CO2, although the mass transfer resistances were modified. Higher CO 2 uptakes were
    obtained at lower gas velocities, higher liquid velocities. It has also been found that a lower
    gas-liquid ratio increases the absorption yield, while a higher total flow results in lower mass
    transfer resistances. The presence of a chemical reaction intensified the mass transfer,
    resulting in enhancement factors greater than 1. Higher concentrations resulted in better
    CO2 absorption results. The best-performing reagent was EtilEA.

Tesis
1
  • ANDRE ANDERSON COSTA PEREIRA
  • "DEVELOPMENT OF A SYSTEM OF POLYMERIC SOLUTION IN CIRCULATING MEDIUM TO OBTAINING NANO/MICROMETRIC PARTICLES"

  • Líder : JACKSON ARAUJO DE OLIVEIRA
  • MIEMBROS DE LA BANCA :
  • JACKSON ARAUJO DE OLIVEIRA
  • ANDRE LUIS LOPES MORIYAMA
  • ELISA MARIA BITTENCOURT DUTRA DE SOUSA
  • MARIA CAROLINA BURGOS COSTA DO NASCIMENTO
  • BENTO PEREIRA DA COSTA NETO
  • THELMA SLEY PACHECO CELLET
  • Data: 08-feb-2018


  • Resumen Espectáculo
  • Polymeric particles formed on a nanometric scale are of fundamental interest today, especially when used as carrier systems in the controlled release of drugs, cosmetics and nutraceuticals, as well as in the coating of materials with magnetic properties. Therefore, the present study aims to develop a system for the production of particles of poly (methyl methacrylate) (PMMA) and polycaprolactone (PCL) from the atomization of polymer solution in antisolvent medium. In this system, polymer solutions in different solvents are prepared and atomized in the form of a spray. The droplets generated with the atomization come into contact with an antisolvent liquid which causes the precipitation and formation of the polymer particles. In this work, experiments using the proposed system were performed under different operating conditions and the particles obtained were analyzed by Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). The results showed that it is possible to obtain particles with nanosphere/nanocapsule and nanofiber characteristics with a size distribution in the range of 50 to 5000 nm. It was also possible to observe that the process variables such as the nature of the polymer, the type of solvent (acetone, ethyl acetate, ethyl alcohol, isopropyl alcohol and propyl alcohol), atomization pressure (0.25-3 bar) and temperature (10-40°C) directly affect the morphology and Particle Size Distribution (PSD). In addition, the potential of encapsulation of the proposed system was evaluated. Cotton oil and ferrite were used as material to be encapsulated. The particles produced in this evaluation were analyzed by DLS, MET and also by Field Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD) for the encapsulation check. According to these results, it was verified the formation of carrier particles, with characteristics of nanocapsules and nanospheres.

2
  • THAYSE NAIANNE PIRES DANTAS
  • "Study of the influence of the physical properties of soursop mixtures drying in spouted bed with intermittent feeding"

  • Líder : MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • MIEMBROS DE LA BANCA :
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • EDUARDO LINS DE BARROS NETO
  • MARCELLO MAIA DE ALMEIDA
  • ODELSIA LEONOR SANCHEZ DE ALSINA
  • SANDRA CRISTINA DOS SANTOS ROCHA
  • Data: 16-feb-2018


  • Resumen Espectáculo
  • The objective of this work is to analyze the influences of the physical characteristics of formulated mixtures and the operational conditions for a definition of mathematical equations, macroscopic heat and mass balances, that describe a production of powder and the behavior dryer the pulp of soursop-milk or soursop-albumin in spouted bed with intermittent feeding and HDPE or PP as inert particles. The drying tests were carried out following 2³ factorial planning with 4 repetitions at the central point. The following independent variables were considered: inlet air temperature (60 - 80ºC) and solids concentrations (30 - 50%). From the physical properties of the mixtures, the models that represent the flow of powder in the function of time were determined. Considering suspension accumulation inside the device, develop models to evaluate a temperature and humidity of the air at the dryer outlet. The system of ordinary differential balances, implemented and resolved numerically using Fortran routines, in which the influence of process variables on drying dynamics were assessed. The results obtained in modeling and mathematical simulations were compared with experimental data, indicating that the model fits the process well, based on outlet air temperature and moisture.

     

3
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • "Recovery and concentration of biomolecules by aqueous two-phase flotation"

     

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • GORETE RIBEIRO DE MACEDO
  • JACKSON ARAUJO DE OLIVEIRA
  • LUCIANA IGARASHI MAFRA
  • LÍBIA DE SOUSA CONRADO OLIVEIRA
  • NATHALIA KELLY DE ARAUJO
  • Data: 20-feb-2018


  • Resumen Espectáculo
  • Solvent sublation (SS) is a technique based on the adsorption of active superficial substances at a gas / liquid interface and has been highlighted, in relation to liquid-liquid extraction (LLE), by some benefits such as simple operation, low dosage high solvent separation rates and product concentration; although, it is not suitable for treating all biomolecules. Derived from solvent sublation, aqueous two-phase flotation (ATPF) operates in an environment with high water content and has gained prominence in recent years in the recovery of phenolic components. In this context, the present thesis explores ATPF as a separation technique to recover molecules from different sources such as plant extract: gallic acid (GA) - from infusion of guava leaves, and polyphenols like (+) - catechin and quercetin of the depulped residue of a typical Amazonian fruit, camu-camu. In addition, the bactericidal agent 2-hydroxybiphenyl (2-HBP) produced via biodesulfurization of 4-methyl-dibenzothiophene by Rhodococcus rhodochrous was recovered by ATPF. In these studies, aqueous biphasic systems were formed from the polymer Polyethyleneglycol (PEG) and ammonium sulfate salt, and flotation was favored by the injection of compressed air to generate the ascending bubbles. The column in the ATPF system was made of glass with a 2.64 cm internal diameter and a capacity of 180 mL. The column was fitted to the bottom with a sintered glass disk of G4 porosity. A scale magnification, with the height: diameter ratio used as a criterion, was also performed (for ATPF-camu camu) in a glass column of dimensions 60.0 x 8.00 cm and a useful volume of 2.5 L. results showed that the optimal operating conditions for recovery of gallic acid by ATPF were: pH = 4.0; [ammonium sulfate] = 450 g / L; [PEG] = 80% (m / m); [AG] = 500 μg / mL; flotation time = 120 min; air flow = 37.5 mL / min; volumetric ratio = 0.1. When fed with guava leaf extract, the ATPF showed higher enrichment indexes and gallic acid distribution ratios than extraction in a conventional biphasic aqueous system. In the study with the camu-camu residue, the optimal experimental conditions were: pH = 5.0; [ammonium sulfate] = 450 g / L; air flow = 37.5 mL / min; flotation time = 60 min; volumetric ratio = 0.1. In this case, in the optimum condition, a separation efficiency of 81.02% and a concentration coefficient two times higher than the traditional two-phase aqueous extraction were obtained. In addition, the increase in antioxidant power in the upper phase was observed, resulting from the migration of some phenolic components such as gallic acid, sirgenic acid, quercetin and (+) - catechin. It should be noted that the scale-up was successful. Alternatively, a multivariate methodology was used to define the best operating conditions of ATPF to recover 2-HBP. After a fractional experimental design, only the variables of air flow, float time and volume of the top phase were optimized by the Box-Behnken design, in which it was possible to reach separation efficiency values of 43.55-57.55% and coefficients concentration of 3.84-5.88. As in the previous chapters, ATPF surpassed the two-phase aqueous system extraction, liquid-liquid extraction and solvent sublation in terms of enrichment factors. The flotation process was also successful in the recovery and concentration of 2-HBP from the fermented broth, although analysis by HPLC indicates the high concentration of contaminants in the top phase. Thus, the results showed that ATPF is a promising technique to recover and, mainly, concentrate phenolic components from complex media such as natural extracts and fermentation broths.

4
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Production of cellulases by Aspergillus fumigatus through solid state fermentation and recovery and purification by micellar system in two phases aqueous

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • GORETE RIBEIRO DE MACEDO
  • MARCELINO GEVILBERGUE VIANA
  • MICHELLE ROSSANA FERREIRA VAZ
  • SHARLINE FLORENTINO DE MELO SANTOS
  • Data: 22-feb-2018


  • Resumen Espectáculo
  • The field of renewable energies has attracted much interest from world-wide research because of the need to minimize damage to the environment and reduce dependence on fossil fuel energy. Biodiesel has established itself as a promising source of renewable and substitute energy for oil and diesel because of its high energy, biodegradable and "clean burning". The interesterification with methyl acetate is a new technique and has the advantage of producing, in addition to methyl esters (biodiesel), triacetin (product of great market value). Supercritical technology enables the production of biodiesel without the presence of catalysts, eliminating the need for further purification processes. The sesame (Sesamum Inducum L.) is one of the oldest oilseeds used by mankind (from 4300 BC). Its seeds provide a large amount of unsaturated fatty acids, especially oleic (from 35.9 to 42.3%) and linoleic (from 41.5 to 47.9%). Thus, the present work seeks to analyze the viability of biodiesel production through the reaction of non-catalytic interesterification of sesame oil with methyl acetate under supercritical conditions, the oil yield, the parameters that influence the reaction (oil / acetate molar ratio of methyl, pressure and operating temperature, ...) and the optimum conditions using this technique.

5
  • ERIKA CRISTINA LOURENÇO DE OLIVEIRA
  • “MODELING AND SIMULATION OF THE WAX SOLUBILIZATION IN PIPES AND WELLS AND DEPOSITION OF THE WAX IN TUBES IN LAMINAR AND TURBULENT REGIME”

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • CAMILA GAMBINI PEREIRA COURTIAL
  • EDUARDO LINS DE BARROS NETO
  • JENNYS LOURDES MENESES BARILLAS
  • RICARDO PAULO FONSECA MELO
  • TARCILIO VIANA DUTRA JUNIOR
  • Data: 23-feb-2018


  • Resumen Espectáculo
  • Crude oil is a complex mixture of saturated, paraffinic, aromatic hydrocarbons, asphaltenes and resins. In the reservoir conditions, these compounds are totally solubilized in the crude oil and as it flows to the surface, the oil begins to undergo modifications in the conditions of temperature and pressure, causing in the appearance of solid crystals, the breakage of this equilibrium occurs due to the cooling and the depressurising that the petroleum undergoes during its elevation and transport. These precipitates, which are mostly formed by waxs, eventually limit the flow area, being one of the major factors responsible for problems related to the transport of oil, such as obstructions in the transport ducts and production wells.

    Aiming to study the process of the wax solubilizing in ducts and wells, as well as the process of the wax deposition in ducts in the various types of flow, this work want to develop a computational program in a development environment VBA for Excel®, able to simulate these processes under various conditions, using of mathematical models that represent the process, based on the phenomena involved such as mass transfer, energy transfer and solid-liquid equilibrium.

    The work was developed in four steps: i) modeling the heat and mass transfer phenomena, ii) modeling the routine of the activity coefficients through the UNIFAC model and the solid-liquid equilibrium system modeling; iii) mathematical modeling of the solubilization and deposition process, as well as calculation of the paraffin thickness over time; iv) implementation of the models in a VBA for Excel® development environment and creation of a graphical interface to simulate the process of solubilization and deposition of paraffin in ducts and solubilization of paraffin in wells. It was possible to verify that the simulator was proportional and satisfactory to the expected results, where it was possible to evaluate the influence of each variable studied (Flow, Inlet Temperature, External Temperature, Carbonic Solvent Chain) under different operating conditions.

6
  • FEDRA ALEXANDRA DE SOUSA VAQUERO MARADO FERREIRA
  • "Phase equilibria at High pressures for Synthetic Systems and Oil Samples"

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • OSVALDO CHIAVONE FILHO
  • CAMILA GAMBINI PEREIRA COURTIAL
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • LINDEMBERG DE JESUS NOGUEIRA DUARTE
  • CÍCERO SENA MOREIRA GOMES
  • ELTON FRANCIESCHI
  • Data: 05-mar-2018


  • Resumen Espectáculo
  • The extreme conditions of pressure, temperature and carbon dioxide composition present in the pre-salt deposits are a challenge related to the exploration and production of these reservoirs and require a deepened technological study to design equipment suitable for these operating conditions. In the context of high concentrations of carbon dioxide, in recent years its use in the tertiary recovery of petroleum has been gaining expression and research in this area is necessary for greater knowledge of the process and ideal conditions for its injection. Thus, the demand for information in the area of phase behavior at high pressures in the presence of carbon dioxide from representative oil systems and from actual oil samples becomes extremely important for the oil industry. This work aims the study of the phase behavior at high pressures of synthetic and representative systems of petroleum using the synthetic visual method and synthetic non visual. The research was divided in two stages. In the first stage, binary systems (CO2 + cyclohexene and CO2 + squalane) and a ternary system (CO2 + cyclohexene + squalane) representative of an oil sample were studied. The thermodynamic modeling was done by applying the cubic state equation of Soave-Reidlich-Kwong, with estimated parameters of Mathias and Copeman for the vapor phase and van der Waals 2 mixing rule.
    In the second stage two real samples were studied, one being condensed gas and the other being light petroleum. These samples were characterized and fractionated and later used in the study of phase behavior with binary systems: CO2 + condensed gas and CO2 + light petroleum fractions. The thermodynamic modeling was done by applying the cubic state equation of Adachi-Lu-Sugie, with van der Waals mixing rule 1. To obtain all the experimental data an equilibrium cell was used with a sapphire window that allowed the visualization of the phase change. However, the non-visual method was also applied based on the cell volume variation in the phase transition. This method is particularly important in petroleum samples, since these are not translucent. Thus, bubble pressures were determined for the systems at various temperatures and compositions by the two methods. The deviations between the two experimental methods are also presented.
     
     
     
7
  • ROMERO GOMES DA SILVA ARAÚJO FILHO
  • "Cement slurries for oil wells in fractured zones"

  • Líder : MARCUS ANTONIO DE FREITAS MELO
  • MIEMBROS DE LA BANCA :
  • MARCUS ANTONIO DE FREITAS MELO
  • RENATA MARTINS BRAGA
  • JÚLIO CÉZAR DE OLIVEIRA FREITAS
  • BRUNO LEONARDO DE SENA COSTA
  • ERICA NATASCHE DE MEDEIROS GURGEL PINTO
  • FABÍOLA DIAS DA SILVA CURBELO
  • Data: 23-mar-2018


  • Resumen Espectáculo
  • Hydrocarbon deposits made up of oil and natural gas occur naturally throughout the world. Such deposits are usually contained within rocks called "reservoir rocks", usually sandstones or carbonates. These deposits exist in varying conditions of pressure, temperature and depth, from a few hundred to thousands of meters. During the process of drilling the oil well to reach the reservoir rocks it is common to find zones with high permeability or natural fractures when there is the possibility that some or all of the cement or drilling fluid is lost, that is: invade the formation being drilled and / or cemented without return. Such events are known in the industry as "fluid loss" may cause various undesirable effects, among them, loss of well control during drilling / completion or failures in the cementation, which may even lead to loss of the well or serious accidents. Commercially, there are alternatives for the development of cement slurry systems with loss of fluid control for the formation. However, most of these solutions have a high cost and low efficiency guarantee. Due to the reduction in the operating margins of the oil industry due to the reduction in the price of a barrel of oil, it is increasingly sought to optimize these processes, reducing costs and potential for failure. In this work, a set of statistical plans was carried out to jointly determine the best cement paste that could be developed with the materials used for loss control and, among these materials, how they would behave in the loss of fluid. The studied pulp was developed with vermiculite, calcium chloride and nanosilica, studying the action of vermiculite as a filtration controller. Besides this, polystyrene foam was also added to the pulp to also act as a loss controller. This composition had stable pastes with high water / cement ratio, excellent rheological properties and low densities, which were fixed at 12.5 lb / gal and optimal fluid loss control for training. Hydrothermal stability studies showed that the pastes were stable under these conditions, and mechanical strength tests showed values up to 10 MPa. The action of the foam contributed with the reduction of up to 97.5% of the loss of fluid to the formation, compared to other non-foamed pastes.

8
  • INDIRA ARITANA FERNANDES DE MEDEIROS
  • Nanostructuring of Cobalt Ferrites (CoxFe3-xO4): effect on the catalysis and detection of polluting gas. 

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • CHRISTINE LEROUX
  • FRANCK BERGER
  • JEAN GUILLAUME EON
  • JOAO FERNANDES DE SOUSA
  • MADJID ARAB
  • SUZANNE GIORGIO
  • VERONIQUE MADIGOU
  • Data: 05-jul-2018


  • Resumen Espectáculo
  • The present thesis aims to study the cobalt ferrite (CoxFe3-xO4) nanocrystallites morphology and composition effects on their catalytic and detection properties. Different synthesis methods such as hydrothermal, solvothermal and thermal decomposition were used to control nanoparticles shape and composition. Moreover, the effect of synthesis parameters variations, such as addition of different surfactants, different solvents, surfactant concentration, temperature and time of synthesis were also investigated. The powders were characterized by X-ray Diffraction and Transmission Electron Microscopy and analyzed by Dispersive Energy Spectroscopy. The catalytic and detection properties were evaluated in CO atmosphere in the range of 100 to 300°C and in NO2 atmosphere at 150 and 200°C. CoFe2O4 nanooctahedra with 15-20 nm were produced by hydrothermal synthesis using different surfactants (CTAB, SDS and PVP). CoxFe3-xO4 with x = 1.5 and x = 1.8 were also synthesized by hydrothermal method. However, the TEM analysis showed that the amount of Co present in CoxFe3-xO4 is limited at x = 1.5. When ethylene glycol was used as solvent, Co1,8Fe1,2O4 of 4 nm with irregular shape and homogeneous composition was obtained. A mixture of nanocubes (18 nm) and nanospheres (10 nm) of CoFe2O4 were produced by solvothermal synthesis using oleylamine as surfactant. In the thermal decomposition, nanospherical CoFe2O4 were produced in benzyl alcohol, while nanooctahedra of Co0.5Fe2.5O4 were produced in dibenzyl ether. The nanooctahedra with composition x = 1.5 and the mixture of nanocubes and nanospheres were tested in the CO catalysis. The nanocubes and nanospheres mixtures were also tested in the detection of NO2. The results were compared with those obtained for the nanooctahedra with x=1 existent in the literature.  The applications results showed that the shape and composition have an effect on the nanoparticles catalytic activity. The powder of CoxFe3-xO4 with x = 1.5 has higher activity and lower temperature needed for the maximum CO conversion. For the detection test, the mixture of cubes and spheres presented lower sensitivity than the nanooctahedra for all temperatures analyzed. The maximum sensor response obtained was 52% when the sensor was subjected to 50 ppm of NO2 at 200 °C.

9
  • ROSANGELA DALA POSSA
  • Influence of the treatment of the char from the pyrolysis of the sewage sludge on the purification of a methane-rich gas mixture that is similar to the gases obtained from the fermentation of swine manure.
  • Líder : JOAO FERNANDES DE SOUSA
  • MIEMBROS DE LA BANCA :
  • JOAO FERNANDES DE SOUSA
  • ANDREA OLIVEIRA NUNES
  • LUCIENE DA SILVA SANTOS
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • FRANCISCO WENDELL BEZERRA LOPES
  • JUAN ALBERTO CHAVEZ RUIZ
  • Data: 06-jul-2018


  • Resumen Espectáculo
  • Biogas is a valuable source of renewable energy because it is composed mainly of methane (60-80%), carbon dioxide (20-40%), and traces of ammonia and hydrogen sulfide. The main application of biogas is the use of methane as fuel for electric motors and generators. In order to increase the calorific value of biogas to the same level as that of methane, the other gases have to be removed. One of the most common processes used to purify biogas is adsorption using activated carbons. The objective of this work was to the study the adsorption of carbon dioxide, ammonia, and hydrogen from a mixture with the same composition as that of the biogas from the fermentation of swine manure. The adsorbent used was the char from the pyrolysis of sewage sludge at 500 °C. The chars underwent physical ativation (at 700 °C, for 2 hours, under N2), chemical activation using HCl (7.5 M) or KOH (3.0 M), and were characterized for composition and textural properties via XRD, XRF, BET, and SEM. The experiments were carried out in a fixed-bed column (adsorber) at 25 °C and 1 atm. The gas flow rate was 50 mL/min, and the mass of char were 18.4 or 6.0 g. The results showed that the chemical activation significantly enhanced the adsorption. Regarding the adsorption of H2S and CO2, the best result was for the char treated with HCl. The char had high specific area (248 m2/g), high breakthrough time (400 min for H2S, and 175.5 min for CO2), high saturation time (1020 min for H2S, and 484.5 for CO2), and high adsorption capacities (670,33 mg H2S/gads e 218.385 mg H2S/gads). The chars were selective for NH3 and had no affinity for CH4. The percentages of adsorption were 61,4% for H2S and 75% for CO2 using HCl. For the gas mixture, the percentages of adsorption were 71,8% for H2S and 55% for CO2. The dynamic adsorption was modeled by a system of differential equations describing mass balances for gas and particle phases. The equations were solved numerically against experimental data (molar fraction) in order to obtain estimates for parameters such as axial diffusivity, effective intraparticle diffusivity, and external mass transfer coefficient for H2S and CO2 as well as others present in the mixture involving NH3 and CH4.

10
  • SUYLAN LOURDES DE ARAÚJO DANTAS
  • Synthesis and characterization of carbides of pure molybdenum and doped with cobalt and nickel for photocatalytic degradation and adsorption of dye Maxilon Blue GRL 300

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDARAIR GOMES DOS SANTOS
  • ANDRE LUIS LOPES MORIYAMA
  • ANDREA OLIVEIRA NUNES
  • CARLSON PEREIRA DE SOUZA
  • FRANCISCO WENDELL BEZERRA LOPES
  • JOAO BOSCO LUCENA DE OLIVEIRA
  • Data: 27-jul-2018


  • Resumen Espectáculo
  • The search for processes of production of low cost materials has been studied in recent years, mainly by the industries, in order to relate the cost / benefit associated with low risk to the environment, and the ease of transport and its use. The transition metal carbides are gaining emphasis, due to their catalytic activity, stability and selectivity in a wide range of reactions. The purpose of performing doping with cobalt and nickel on the molybdenum carbide is the search for the alteration in the carbide structure in order to improve its catalytic activity. The process of photocatalysis is based on a reaction that a semiconductor material is activated by the emission of sunlight or artificial on the particles with sufficient energy to excite the electrons of the band of valence for the conduction band that region between the bands is called " bandgap ". This work aims to develop the study of the synthesis, characterization and photocatalytic/adsorption application of semiconductor materials with carbide type structure, using the gas-solid reaction method in a fixed-bed reactor. These materials were characterized using the techniques of XRD, crystallite size, TGA, BET, grain size and SEM/EDS. With its characterization, it is possible to understand the relation between its structural properties and its activities as heterogeneous catalysts. The results of photocatalysis were satisfactory, the studied carbides obtained good yield in the process of degradation and adsorption of the dye. The best result was for Mo2C_Ni 5% in acid medium with yield around 97% degradation / adsorption of the dye.

11
  • EMILIANNY RAFAELY BATISTA MAGALHAES
  • TREATMENT AND APPLICATION STRATEGIES FOR PRODUCED WATER USING A SYNTHETIC EFFLUENT 

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • ANITA MARIA DE LIMA
  • CARLOS EDUARDO DE ARAÚJO PADILHA
  • EVERALDO SILVINO DOS SANTOS
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • ROBERTO RODRIGUES DE SOUZA
  • SÉRGIO DANTAS DE OLIVEIRA JÚNIOR
  • Data: 03-ago-2018


  • Resumen Espectáculo
  • The produced water, generated in the exploration and production stage, is one of the main effluents of the petroleum industry and is characterized as an effluent of complex composition, formed by various organic and inorganic compounds. It accounts for about 70% of total wastewater generated during the life of the well and their characteristics and quantities produced are also dependent on their location and age of this one.Currently, in Brazil, millions of m³ of water effluents are disposed of in the environment, as well as a considerable amount of oils and greases. The present thesis aimed to investigate, through a synthesized effluent, potential applicabilities for untreated and treated produced water and, thus, enable the management and reuse of this effluent. The results showed that produced water without previous treatment was presented with a potential use for supplementation of carbon source to agroindustrial residues in the production of biosurfactant. promoting a positive emulsion stability effect when using the green coconut shells as the substrate and maintaining stable, under elevated temperatures, the emulsion formed by the broth produced by cashew residues. When undergoing a physical-chemical treatment - whose combined process was formed by a flocculation step, with 226 rpm and 3 minutes in the fast mixing stage and 90 rpm and 4 minutes in the slow mixing stage, followed by dissolved air flotation, carried out under the injection of 10% v/v of water saturated with air at 6 bar and with a flotation time of 28 minutes -, demonstrated that extracts of Moringa oleifera seeds with and without oil, at a concentration of 64 mg/L, are effective natural flocculants in their treatment, reducing the content of oils and greases (TOG) in about 81%, with the oil extraction unaffecting the coagulant effect of the seeds. The biological treatment through activated sludge was highly efficient in the removal of TOG from produced water, with efficiencies, in most cases, greater than 90% and achieving compliance with the environmental requirements for this parameter. Through the results obtained it was possible to conclude that the effluent treated by this biological process presents a promising ability to be reused in the germination and irrigation of non-food crops.

12
  • MARIA DO SOCORRO BEZERRA DA SILVA
  • Study of the removal of heavy metals from liquid effluents by electrodeposition using copper electrodes

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • ARIADNE DE SOUZA SILVA
  • CARLSON PEREIRA DE SOUZA
  • FRANCISCO WENDELL BEZERRA LOPES
  • JOANA MARIA DE FARIAS BARROS
  • MICHELLE SINARA GREGÓRIO DANTAS
  • Data: 30-oct-2018


  • Resumen Espectáculo
  • Electronic waste is becoming one of the most serious environmental and social problems today. To take aware of the problem, we need to discuss disposal and recycling alternatives. In this thesis, a new methodology for the removal of metals from printed circuit boards (PCB) is presented. This methodology contributes to the minimization of environmental impacts by recovering metallic elements of PCB, which reduces the exploitation of mineral deposits. The process of recycling of the PCB presented in this thesis consisted of the application of chemical and physical technologies, involving the leaching stage in acidic (nitric and hydrochloric) environments and the removal of copper, silver and tin by electrodeposition using copper electrodes. The initial electrodeposition reactions were performed in three current conditions (0.5 - 1.0 - 1.5 A) and time variations (15 - 30 - 60 - 90 and 120 min), respectively, with the original solution. For all conditions, the process was accomplished out without mechanical stirring and with mechanical agitation at 550 rpm. In another stage of reactions, the solution was diluted in 1: 3 and 1: 7 proportions, and electroplating tests were carried out under the same current conditions, with and without stirring and a constant time of 60 minutes. The electrodeposition of copper has been shown to be efficient at all applied times and currents. For silver, the best deposition rates occurred at a current density of 0.022 A / cm2 and time of 60 minutes. In the diluted solutions, the copper removal was significant in all studied parameters. For the tin, the best removals proceeded in the process without agitation, presenting high rates of removel in current of 1.5 A and without agitation. The concentrations of silver and tin, at the end of each process, were analyzed by X-Ray Fluorescence (FRX), Atomic Absorption Spectroscopy (EAA), X-Ray Diffraction. The morphology of the deposits, analyzed by Scanning Electron Microscopy (SEM) coupled to the Dispersive Energy Spectroscopy.

13
  • RAFAEL HERNANDEZ DAMASCENA DOS PASSOS
  • Catalytic and electrical properties of strontium and cerium tungstate:
    Conversion of methane

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLSON PEREIRA DE SOUZA
  • CESAR AUGUSTO MORAES DE ABREU
  • CHRISTINE LEROUX
  • ELSON LONGO DA SILVA
  • JEAN HENRY FERRASSE
  • MADJID ARAB
  • SIBELE BERENICE CASTELLA PERGHER
  • VANESSA COULET
  • Data: 06-dic-2018


  • Resumen Espectáculo
  • Nanoparticles of cerium and strontium tungstate have been prepared from the
    method of synthesis of the ceramic powders involved the complexation combining EDTA-citrate
    in order to determine the catalytic activity and the electrical properties of the obtained materials.
    The syntheses produced strontium (SrWO4), cerium (Ce2W3O12) tungstates and a ternary
    tungstate composed of Sr and Ce identified with structure Sr0.5Ce0.35□0.15WO4. In the interest of
    characterize them, TG-DTG, XRD and MET analyzes were performed. TG-DTG analyzes determined
    that material with crystalline structure could be obtained from 600°C. The diffractograms
    indicated tetragonal crystalline structure with spatial group I41/a (N° 88) for SrWO4 and
    monoclinic structure belonging to space group C2/c (Nº 15) for Ce2(WO4)3. The TEM images
    allowed us to determine the mean crystallite size that were shown to be compatible with the
    results calculated from the Williamson-Hall equation. Refined XRD analysis using the Rietveld
    method, high-resolution transmission electron microscopy (HRTEM) images and electronic
    diffraction were applied to study the ternary tungstate and to define its composition and crystalline
    structure as tetragonal belonging to the space group I4̅ (N° 82). Analyzes were conducted
    to determine the catalytic activity in partial oxidation of CH4 considering a 3³ experimental
    design where the parameters analyzed were reaction temperature, CH4 concentration and catalyst
    type at three different levels. It was observed that the most relevant parameters for the CH4
    oxidation reaction were the type of catalyst and the reaction temperature, respectively. The
    concentration was not relevant to the result and the most efficient catalyst to convert CH4 into
    synthesis gas (H2 + CO) was, in descending order, SrWO4, Sr0.5Ce0.35□0.15WO4 and Ce2(WO4)3.
    Moreover, the electrical properties analysis determined the activation energies of the samples,
    the result was 1.42eV, 1.16eV and 0.99eV for SrWO4, Sr0.5Ce0.35□0.15WO4 and Ce2(WO4)3, respectively

14
  • CAMILA PACELLY BRANDÃO DE ARAÚJO
  • Molybdenum carbides and oxides with Co addition: evaluation of doping route effect and of kinetic parameters for the gas-solid reaction synthesis.

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • ARIADNE DE SOUZA SILVA
  • CARLSON PEREIRA DE SOUZA
  • CLEONILSON MAFRA BARBOSA
  • GILSON GARCIA DA SILVA
  • UILAME UMBELINO GOMES
  • Data: 07-dic-2018


  • Resumen Espectáculo
  • The development of new materials with improved properties is interesting for several industrial segments from the catalysis of chemical reactions for environmental legislation compliance, to the development of new electronic devices. Carbides and Mo oxides with cobalt addition may exhibit a diversity of intrinsic properties of great interest. In this work two methodologies for the addition of Co in these compounds with Mo (CoMoO4 and Mo2C-Co) were studied: solid and wet, having commercial molybdenum molybdate [(NH4) 6 [Mo7O24]4H2O] and cobalt nitrate [Co(NO3)2.6H2O] as the starting material. The doped precursors were characterized and the products of the thermal treatment (oxides) and the carbo-reduction reaction (carbides) were evaluated according to morphological (SEM), compositional (FRX) and crystallographic (XRD) aspects. It was verified that the dopant’s addition via solid state methodology presented itself, in both cases, as a more robust route; producing materials with smaller crystal sizes (~ 30nm to the carbide) and with higher dopant retention (δ ~ 10%) than the wet method (dp ~ 50nm and δ ~ 40%). A study of the conditions for obtaining Mo2C with and without addition of dopant was performed using interval reactions. In the kinetic evaluation, Avrami’s nucleation and growth models were tested, as well as those proposed by Levenspiel of Shrinking Core. It was verified that the reaction proceeds according to MoO2àMoà Mo2C and that the model that best represents the actual behavior of the gas-solid reaction is that of Avrami with grain growth rate of M = 85.4 and dimensional parameter N = 0.34.

15
  • FRANCISCA PEREIRA DE MORAES
  • Chemometric analysis and physico-chemical, bioactive and biological in vitro evaluation of fresh and freeze-dried acerola (Malpighia emarginata).

  • Líder : ROBERTA TARGINO HOSKIN
  • MIEMBROS DE LA BANCA :
  • ROBERTA TARGINO HOSKIN
  • MARIA DE FÁTIMA DANTAS DE MEDEIROS
  • KARLA SUZANNE FLORENTINO DA SILVA CHAVES DAMASCENO
  • KATIA CRISTINA BORGES
  • JAILANE DE SOUZA AQUINO
  • FLÁVIO LUIZ HONORATO DA SILVA
  • Data: 07-dic-2018


  • Resumen Espectáculo
  • Brazil is an important producer of tropical fruits. Among them, acerola (Malpighia emarginata) is recognized for its high content of ascorbic acid (AA), total phenolic compounds (TPC), carotenoids, anthocyanins and potent antioxidant capacity. Considering the bioactive and commercial value of this fruit, the present work aimed to evaluate acerola using different approaches, which are presented in the six chapters of this thesis. A general introduction opens this document and discusses keytopics covered throughout the research. The second chapter shows the evaluation of the whole acerola fruit in regard to its concentration of bioactive compounds (AA, TPC) and antioxidant activity (DPPH), by the near infrared (NIR) technique and application of chemometric analysis. In the third chapter, freeze-drying was applied to acerola pulp and acerola pomace in order to compare the final products to the fresh fruit, as well as to monitor the stability of the acerola powders along the storage. In the fourth chapter, commercially purchased freeze-died acerola was evaluated and compared to selected freeze-dried fruits (camu-camu, apple and pineapple) in regard to in vitro biological analyzes. Selected phytochemical compounds (AA, TPC, anthocyanins, phenolic acids) and antioxidant activity (by two methods of detection: reducing iron potential - FRAP and capturing the radicals of 2,2 - diphenyl - 1 - picrylhydrazyl - DPPH) of the fruit extracts were analyzed. In addition, the effects of these extracts on reducing the production of reactive oxygen species (ROS) and nitric oxide (NO) in RAW 264.7 macrophages were investigated. Initially, the toxicity of the samples (reduction method of 3- (4,5-dimethylthiazol-2yl) -2,5-diphenyl tetrazolium bromide - MTT) to RAW 264.7 cells was assessed. The anti-inflammatory activity of acerola extracts was tested by analysing  enzymes and mediators with proinflammatory activity (inducible nitric oxide synthase - iNOS, cyclooxygenase – COX-2, interleukins - IL1β and IL-6, tumor necrosis factor - TNFα), in addition to an in vitro assay to investigate the cell migration properties of freeze-dried extracts in adult human dermal fibroblast cells (HDFα). The final chapters 5 and 6 show the conclusion and the literature sources used hrere. The results show that the NIRS model is a fast and reliable non-destructive analytical strategy to evaluate the ascorbic acid, phenolic and antioxidant capacity in acerola fruits. It has also been demonstrated that freeze-dried acerola powders retain high ascorbic acid concentration and the preservation of ascorbic acid and anthocyanins is more effective under refrigerated storage. The results of the in vitro biological tests showed that acerola extracts, camu-camu, apple and pineapple are able to reduce the production of reactive oxygen species (ROS). Only freeze-dried acerola and camu-camu extracts reduced the production of reactive nitrogen species (NO). Extracts of these fruits also suppressed the expression of IL1β and IL6, and freeze-dried acerola is the only one capable of reducing the expression of COX-2 enzyme. The acerola was also able to enhance cell migration, based on the in vitro results obtained in HDFa cells, which reflects the skin cells' ability to regenerate after injury. The high ascorbic acid content in acerola seems to play an important role in the observed in vitro biological effects. Overall, it is concluded that acerola presents relevant bioactive and in vitro biological potential, which can justify its exploitation as a functional ingredient in food and pharmaceutical formulations.

16
  • ADRIANA KARLA VIRGOLINO GUIMARÃES
  • Study of oiticica oil (Licania rigida, Benth) for biodiesel synthesis and evaluation of its  properties as fuel.

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • OSVALDO CHIAVONE FILHO
  • AMANDA DUARTE GONDIM
  • ANDERSON ALLES DE JESUS
  • LEILA MARTINS DA COSTA QUINTEIRO
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • Data: 11-dic-2018


  • Resumen Espectáculo
  • Changes in the climate resulted from the burning of fossil fuels claims to an urgent modification in the energy matrix. Biodiesel is one of the alternatives proposing the replacement of mineral diesel. The aim of this work is the study of biodiesel production from oiticica oil by a methylic transesterification through homogeneous catalysis (NaOH and KOH). Oiticica has a high oil content in its almond (> 60%). Oiticica seeds were selected and classified according to the year (2015 and 2017), harvest and the degree of maturation (green - V, dry - SS, mature - M and green without epicarp - SV). Oil was extracted by mechanical pressing (continuous and discontinuous). The chemical composition of oiticica oil and biodiesel was determined by Gas Chromatography coupled to Mass Spectroscopy (GC-MS). The synthesis study was carried out under various reaction conditions: temperature (between 32 and 80 °C), reaction time (2 to 5 h), oil/alcohol molar ratio (1:6 - 1:20), and mass percentage of catalyst (0.5 to 2.0%). The most favorable conditions were obtained with molar ratio of 1:9 (O: A), 32 °C, 1% KOH/MeOH catalyst and 4 h for green oiticica oil without epicarp of the second harvest of 2017 (OSV2). The best physico-chemical results obtained from the biodiesel syntheses showed: 0.34 mg KOH/g (acid number), 922.6 kg/m3 (density) and 8.647 mm2/s (kinematic viscosity). The conversion of the esters was determined by thermogravimetric analysis (TG/DTG) and by TGA-FTIR (thermogravimetric analysis coupled with infrared spectrophotometry) by spectra the presence of esters only for B100. Under optimized conditions, the maximum purity was 96.1%, in 4 h 15 min, with 1.27% of the KOH/MeOH catalyst at 32 °C. The oxidative stability of B100 was 0.43 h, indicating a short time to maintain in storage due to susceptibility to biodiesel oxidation. The formulated blends (B10 to B50) showed an acid value above the limit only for B50. For density and kinematic viscosity, all results were within the range specified by the ANP. The flash point for B100 (183 ° C) and B10 (58 ° C) was well above the specified limit, which demonstrates the energy potential of these biofuels. It was concluded that the reactive conditions studied were feasible for the production of oiticica biodiesel. It was also indicated the mixture with other biodiesels due to the viscosity and the use of antioxidants, in order to improve the thermooxidative stability of the biodiesel of oiticica.

17
  • ALCIVAN ALMEIDA EVANGELISTA NETO
  • Liquid-liquid equilibrium data for biodiesel+alcohol+glycerol systems using chicken fat safflower oil for the production of biofuel. 

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MARCIONILA DE OLIVEIRA FERREIRA
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • OSVALDO CHIAVONE FILHO
  • Data: 19-dic-2018


  • Resumen Espectáculo
  • The great dependence of fossil fuels on the planet generates a need for new energy sources, considering that oil 
    is a finite and polluting richness. The environmental part must always be taken into account, since the 
    greenhouse effect is a reality. In this context, biofuels are increasingly being asked to meet the population demand. 
    Among them, biodiesel stands out because it is less toxic, renewable and biodegradable. Transesterification is the most 
    applied method for transforming oils and fats into methyl or ethyl esters, reducing their viscosity and can be used 
    as pure fuel or added to diesel. The raw material can be both animal and vegetable. The by-product formed is 
    glycerin, causing two phases to be obtained. The liquid-liquid equilibrium can be studied during the production 
    process, since the alcohol is miscible in both phases. In this work two raw materials were used to produce biofuel: 
    chicken fat provided by the Apodi-RN municipal market and refined safflower oil. Three biodiesel were obtained: 
    methyl chicken fat, methyl safflower and safflower ethyl. The ester profiles were detected by gas chromatography. The liquid-liquid equilibrium data were obtained by means of calibration curves of the 
    densities as a function of the respective mass fractions for temperatures of 25 °C and 45 °C at ambient 
    pressure. Data were validated using the Othmer-Tobias and Hand correlations, with coefficients close to unity. 
    The distribution and selectivity coefficients for the three systems were calculated. The UNIQUAC model was 
    used to correlate the experimental data, with satisfactory results and with an error always less than 
    1.5%.
18
  • KATHERINE CARRILHO DE OLIVEIRA DEUS
  • Oxidation and liquid-liquid extraction processes using surfactants to remove sulfur from diesel
  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ALCIDES DE OLIVEIRA WANDERLEY NETO
  • EDUARDO LINS DE BARROS NETO
  • RICARDO HENRIQUE DE LIMA LEITE
  • TAMYRIS THAISE COSTA DE SOUZA
  • TEREZA NEUMA DE CASTRO DANTAS
  • Data: 20-dic-2018


  • Resumen Espectáculo
  • Sulfur is one of the main contaminants of petroleum-based fuels and is present mainly in oils from mature fields, like most Brazilian onshore fields. The issue of sulfur in the form of SOx originated in burning of these fuels, such as diesel, affects air quality and bring health risks. Sulphur, when present in large quantities, also promotes corrosion of engines, reducing your lifespan. In 2013, ANP has adopted the new specifications for diesel oil (resolution 50/2013), becoming mandatory for nationwide marketing of diesel oil A (without addition of biodiesel) and B (with addition of biodiesel) with a maximum sulfur content of 500 ppm. Removal of sulfur is therefore of interest to the petrochemical industry. Oxidative desulfurization followed by solvent extraction is one of the most promissing techniques for sulfur heretocycles removal such as dibenzothiphene (DBT) and dimethyldibenzothiophene (DMDBT). In this context the present work studied the application of oxidative desulfurization of diesel (1200 ppm of sulfur), followed by liquid-liquid extraction using non-ionic surfactants. Were obtained the parameters related to liquid-liquid extraction and to the oxidation reaction using hydrogen peroxide (H2O2) and acetic acid (CH3COOH) as a catalyst. The reactional parameters such as temperature, time, concentrations of peroxide and acid and the use of a catalyst on the reaction were evaluated using a 26-2 fractional factorial design. Sulfur concentration were reduced from 1200 ppm to 220 ppm after one oxidative desulfurization step and one liquid-liquid extraction step using Ultranex NP110. Under the same conditions for a model fuel containing 1200 ppm of DBT in n-dodecane the concentration were reduced to below 3 ppm. Therefore, the oxidation and subsequent extraction with surfactant have proven to be effective in desulfurization of diesel.

2017
Disertaciones
1
  • CLEITIANE DA COSTA NOGUEIRA
  • "Evaluation of surfactants in dilute acid and alkaline pre-treatment of green coconut fiber and quantification of post-washing"

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • GORETE RIBEIRO DE MACEDO
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • RUTHINEIA JESSICA ALVES DO NASCIMENTO
  • Data: 07-feb-2017


  • Resumen Espectáculo
  • Brazil is the fourth higher producer of coconut and approximately 85% of the total fruit mass are becoming residue that it could be converted into ethanol. However, the pretreatment of the biomass plays a key role in order to increase the accessibility as well as the biodegradability of cellulose and hemicellulose to facilitate the further saccharification step. Most pretreatments are able to produce inhibitors such as phenolic compounds and acids that must to be removed. Usually water has been used in the washing step but its use should be reduced in order to become the process viable both economically and environmentally. Also, studies are showing that surfactants can be used during the pretreatment aiming to achieve higher yields of fermentable sugars leading thus to higher ethanol production.  In this context, in this study it was investigated the influence of the Tween 80 in the pretreatment of the green coconut fiber also it was assayed the use of the water in the washing step of the pretreated biomass. By means of experimental design it was investigated for both pretreatments using H2SO4 and NaOH the influence of chemical and surfactant concentration as well as the pretreatment time. The obtained biomass after washing suffered enzymatic hydrolysis (Celluclast® 1.5L, 50 oC, 150 rpm, 96h, 20 FPU/g, 20CBU/g, 10FXU/g) assaying the conversion of the produced fermentable sugars. The acidic pretreatment showed that both H2SO4 concentration and the pretreatment time were significant, showing the former a negative effect while the latter showed a positive one. The best hydrolysis result for this planning was of 6.86 g/L and 2.14 g/L for glucose e xylose, respectively, obtained for the run with H2SO4 and Tween 80 at 60 min. For the alkaline pretreatment both the NaOH and Tween 80 concentration were significant, at 95.0% significance level, in which the best result after hydrolysis produced 13.83 g/L glucose and 5.77 g/L xylose using 2.0% (m/v) NaOH, 3.0 % (m/m) Tween 80 at 10 min. The pretreated material showing the highest concentration of fermentable sugars was assayed both morphologically and physico-chemically at presence and absence of surfactant. The evaluation of the pretreated material washing showed the possibility of reducing up to 75% of initial water volume without hampering the final production. The use of Tween 80 in the alkaline pretreatment improved the conversion into glucose and xylose during the enzymatic hydrolysis of the pretreated biomass. However, it did not show any significant influence for the acidic pretreatment. Besides, it was observed that the quantity of water used at washing step can be significantly reduced then contributing to the lignocellulosic ethanol production.  

     

     

2
  • ANA LAURA OLIVEIRA DE SÁ LEITÃO
  • "Evaluation of cell disruption methods and of different metals immobilized on Streamline Chelating resin for purification 503 antigen of  Leishmania  i. Chagasi."

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • GORETE RIBEIRO DE MACEDO
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • IGOR TADEU LAZZAROTTO BRESOLIN
  • Data: 08-feb-2017


  • Resumen Espectáculo
  • The growing interest of the bioprocess industry for the purified recombinant antigens is mainly due they can be used as a tool for the vaccines production. However, the application of these antigens requires a quite higher degree of purity thus techniques that could reduce the downstream processing cost it would be important. The Expanded Bed Adsorption (EBA) has been shown as a good alternative since it is simple, and combines the clarification, concentration and purification at only step. This study aims investigating the recovery and purification of the 503 antigen from Leishmania i. chagasi expressed in E. coli as well as the simultaneous removal of the endotoxin using EBA coupled to IMAC. First, the best method for the cellular disruption for obtaining the higher antigen content was assayed. The methods studied used were assayed by means of factoral planning using Lysozyme, beads, urea as well as EDTA. Next, adsorption tests in batch were used in order to investigate the use of five metal ions (Cu2+, Ni2+, Zn2+, Co2+, Fe3+) at concentration of 0.1 M, 0.5 M and 0.8 M coupled to the Streamline chelating resin in the adsorption capacity of the 503 antigen. The metal showing the best adsorption capacity was chosen for the EBA experiments. EBA experiments were carried out using a column of 2.6 cm in diameter (30 cm height), coupled to a peristaltic pump. Results showed that higher quantity for the total protein as well as the 503 antigen was obtained ureia at 8.0 M. Also, the best batch adsorption was shown by the Cu2+ metal showing 503 antigen adsorption capacity of 0.102; 0.128 and 0.111 mg/mL of adsorbent for concentrations of 0.1, 0.5 and 0.8 M, respectively. Also, EBA protocol using Streamline chelating coupled copper eluted witht 0.6 M of imidazole was able to recovery only 4.0 % 503 antigen.

     

     

3
  • PATRÍCIA MARIA ROCHA
  • "Surfactin production by Bacillus subtilis UFPEDA 438 using sugarcane molasse as substrate"

  • Líder : EVERALDO SILVINO DOS SANTOS
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • GORETE RIBEIRO DE MACEDO
  • ANA CARMEN DOS SANTOS MENDES DE OLIVEIRA
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • LUCIANA ROCHA BARROS GONÇALVES
  • Data: 09-feb-2017


  • Resumen Espectáculo
  • The biosurfactants are drawing attention of both academy and industry by showing advantages mainly when compared to the chemical surfactants since they can be produced using renewable resources by fermentation. Among the different classes of biosurfactants lipopeptides outstanding by their antibiotic activities, mainly the biosurfactant known as surfactin. Due to its properties it has beed used in many fields such as bioremediation, biology, medice and so on. However, as the others biosurfactants the production cost still is the bottleneck. Then the use of lower cost substrate can be one strategy in order to reduce the production costs. In this study the surfactin was produced by Bacillus subtilis UFPEDA 438 using sugarcane molasse as subtrate in order to reduce costs. The microoganism was cultivated in shaker using a medium containing 4% surgacane molasse. The influence of temperature, agitation as well as the aeration ratio in the surfactin production was investigated. The samples were taken during cultivation until 72 h in order to record the substrate and cells concentration as well as the concentration of surfactin produced. The best results showed that for cultivation at (200 rpm, 36 ºC and 0.4 aeration ration the concentration of surfactin was 199,45 ± 0,13 mg/L reached after 24 h, the substrate to product yield (YP/S) was 0,022 g/g and product productivity (PP) was 8,19 mg/L.h after 24 h.

     

4
  • JÉSSYCA EMANUELLA SARAIVA PEREIRA
  • "Copper ions biosorption from aqueous solution using cashew (anacardium occidentale L.) leaves powder and carnaúba(copernicia prunifera) leaves powder"

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • DAMILSON FERREIRA DOS SANTOS
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • Data: 14-feb-2017


  • Resumen Espectáculo
  • Lately, the contamination of water bodies caused by heavy metals has become a serious environmental issue. The discharge of effluents which contain heavy metal ions, even at small concentration, without an adequate treatment damages human beings, fauna, and flora thus this affects the wellness of the entire ecosystem. Therefore, these effluents require certain treatment to lower the ions level to an environmentally acceptable concentration before discharging them into the environment. Additionally, bioadsorbents have been used for the treatment of contaminated effluents as an alternative to conventional methods. They have also been largely studied in recent researches. Hence, this work aims to evaluate the usage of red cashew (anacardium occidentale L) leaves and carnaúba (copernicia prunifera) leaves, in powder form, as adsorbents for copper ions removal from synthetic effluents. The physicochemical properties of both leaves were investigated, using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (FRX), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR) and physical nitrogen adsorption (BET).The adsorption studies were carried out in a batch system, whose effects of pH (3.0 to 10.0), adsorbent concentration (2 to 20 gL-1), particle size (0.6 to 0.075 mm) And the initial concentration of the adsorbate (10 to 150 mgL-1) were evaluated. The results indicated an increase in adsorption capacity at pH values between 3 and 7. After reaching pH equal to 7, it is observed that the adsorption capacity is reduced for both studies. Regarding the evaluation of the variation of the adsorbent concentration, it was observed that for the powder of the cashew leaves the increase of the mass quantity did not affect the removal process, however, for the powder of the leaves of the carnauba it was observed that the Percentage of removal is directly proportional to the mass increase. For both cases studied, a better efficiency was observed when using particles with sizes between 0.106 and 0.075 mm. The initial concentration study for the bioadhesives presented similar behavior. The amount of adsorption increases with the increase in the initial concentration of the ions in solution. The experimental data of the adsorption isotherms performed on the cashew leaf powder best fit the Freundlich model, however, for the carnauba leaf powder the Langmuir model was more adequate. The kinetics of the adsorption process for both adsorbents reached equilibrium in the first few minutes of reaction, the cashew and carnauba powder reached equilibrium in approximately 20 and 2 minutes, respectively. In general, the experimental data better fit the pseudo-second order model for both adsorbents. Comparing the adsorbents performance, it was observed that the carnauba leaves powder removed a superior copper ion amount, reaching a removal percentage approximately equal to 82%, whereas, under the same conditions of temperature, initial concentration, adsorbent mass and solution volume, the cashew leaves powder showed a removal percentage approximately equal to 27%. The results showed that both the cashew and carnauba leaves powder present the appropriate features for copper adsorption and they both represent an alternative to traditional effluent treatment processes.

     

     

5
  • JÉSSYCA KAENNY DE ANDRADE BEZERRA
  • "Removal of benzene and toluene in aqueous solution by adsorption using activated carbon produced from sewage sludge"
  • Líder : MARCIA MARIA LIMA DUARTE
  • MIEMBROS DE LA BANCA :
  • MARCIA MARIA LIMA DUARTE
  • ANDRE LUIS LOPES MORIYAMA
  • MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
  • GERALDO MARTINS RODRIGUES FILHO
  • Data: 14-feb-2017


  • Resumen Espectáculo
  • Monoaromatic compounds (BTEX) are toxic and carcinogenic substances that even in small dimensions harm the environment and human health. These compounds are used as solvents and found in fuels such as petroleum and gasoline and it is continuously released into the environment. Therefore, the methods of removal of these contaminants are being studied a way to reduce high concentrations present on soils and groundwater. Thus, the adsorption process is based on a solid, denominated adsorbent, to adsorb on surface the contaminants present in the aqueous solutions analyzed. Sludge, a subproduct generated during the sewage treatment process, is a recent problem of worldwide concern. Activated carbon (AC) production for any adsorption process is relatively high, can be used as a potentially economic alternative, and feedstock value and residue reduction can be added. The aim of the present work is to prepare and characterize the activated carbon from the sewage sludge and to apply on monoaromatic compounds (benzene and toluene) in aqueous solutions. In the process of activated carbon synthesis, a chemical activation with potassium hydroxide (KOH) was studied, submitted to the thermal treatment of pyrolysis in a nitrogen flow at 100 mL.min-1, at a temperature of 550ºC. X-ray Diffraction (XRD), X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM) and the study of the surface area using the BET method. The kinetic parameters using as pseudo first order, pseudo second order and intraparticle diffusion equations were shown to be consistent with the results obtained in the literature. In addition, it was possible to observe that both Langmuir and Freundlich model can predict the experimental data for a benzene and toluene adsorption. The results obtained in this study were presented as optimal study conditions in order to favor adaptation costs.

     

6
  • THALES CAINÃ DOS SANTOS BARBALHO
  • "Characterization of petroleum samples: a computational approach and thermodynamic modeling"

     

  • Líder : OSVALDO CHIAVONE FILHO
  • MIEMBROS DE LA BANCA :
  • OSVALDO CHIAVONE FILHO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • ALESSANDRO ALISSON DE LEMOS ARAÚJO
  • EDSON LUIZ FOLETTO
  • Data: 17-feb-2017


  • Resumen Espectáculo
  • It is known that for the pure substances the critical parameters can be found in the literature, but in the case of multicomponent systems the experimental data are scarce. The lack of this information is due to the difficulty in the experimental determination, since in the equilibrium phases of mixtures, mainly involving CO2 and oil or its residues is not simple. In order to determine the composition and critical properties of the pseudocomponents present in the fractions of the studied samples, the present dissertation had the objective of analyzing the thermodynamic properties of petroleum samples in order to develop a computational methodology. The analyzed samples were taken from the production field of a company operating in the western region of the state of Rio Grande do Norte, called gas condensate (CG) and light petroleum fraction (FPL). In order to measure the sample density, a previously calibrated pycnometer was used, that is, with its known volume, in which the density of the dry pycnometer and the sample were determined by the mass difference between the dry pycnometer and the sample. Subsequently, the atmospheric distillation of the sample was carried out, where an amount equivalent to 100 ml of the distillate was weighed. A thermostatic heating mantle (maximum temperature of 300 ° C) and a thermometer for temperature monitoring were used. The distilled fractions were collected after passing through a condenser (20 ° C), the boiling temperature and density being also recorded by pycnometry. Based on these two parameters, it was possible to calculate the molecular mass (MM), using the Riazi-Daubert correlation, as well as the temperature (Tc) and the critical pressure (Pc) using the Lee-Kesler correlations and the acentric factor Ω) from the Edmister correlation of each fraction collected. For the validation of the characterization, bubble pressure experiments with the sample were carried out in an equilibrium cell in which it is possible to visualize the phase change, both by the visual method and by the expansion chamber, for different operating conditions. The composition of the samples ranged from 20 to 60% while the temperature was from 30 to 120 ° C. The results obtained were compared with those simulated by SPECS v5.63 software. It was possible to notice that the characterization carried out was able to approximate the experimental data, since for the systems involving CO2-CG the calculated errors were, on average, 4.46%, 4.84% and 3.71%, respectively. The SRK, PR and ALS state equations, while for CO2-FPL these values were, on average, 7.48%, 4.65% and 2.65%, respectively, for the same state equations. It can be concluded that the present dissertation had the objectives reached and that the methodology employed had a satisfactory performance to describe the studied sample, being able to be applied to different petroleum samples. The main contribution of this procedure is its practicality in the use of pseudo-components to represent fluids in simulators.

     

     

     

7
  • VANESSA RAFAELA CRUZ MOURA BARBALHO
  • "Removal of Cd2+ from synthetic effluent using polymers based on acrylamide"

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • MARCIA MARIA LIMA DUARTE
  • MARTA LIGIA PEREIRA DA SILVA
  • Data: 02-mar-2017


  • Resumen Espectáculo
  • The serious environmental problems generated by the considerable increase in the discards of industrial effluents contaminated with heavy metals in the rivers and seas, together with the increasingly rigorous environmental laws, stimulated the researches in this area, in order to obtain alternative methods of low cost and more efficient in the Water treatment and disposal. The activity of a toxic substance always depends on its concentration in the organism, regardless of the mechanism of intoxication. In this context, the present work has the objective of evaluating the efficiency in the use of anionic polymers based on acrylamide to remove the Cd2+ and Zn2+ metals from a synthetic effluent using a desolubilization method followed by flocculation / filtration. AN 905 VHM, AN 934 SH and AN 977 SH polymers were used, which present different anionicities. The parameters temperature, pH and concentration of the metals solution were evaluated. The 100 ppm metal solution was added to the polymer solution at 1000 ppm, keeping the volume of the metal cation solution constant and the volume of the polymer solution varying, in order to obtain different concentrations in each sample. After the 5 minute period under stirring, flocculation occurred and then filtration of the effluent. The filtrate was analyzed in the atomic absorption spectrophotometer, allowing to evaluate the efficiency of the removal process of the cadmium and zinc ions. The action of pH variation on the medium directly affects the adsorption process, while the temperature has less significant results. The polymers used proved to be efficient in the removal of metals, but due to the different ionic loads, lead to varying percentages of removal, resulting from the interaction between the metal ions and the polymer chain. Analyzing the percentage of removal of the cadmium and zinc ions when the temperature varies, the polymer AN 905 SH was the one that obtained better results, however when the variation of the values of pH for the conditions of these tests was obtained the greater beneficiary was The polymer AN 977 SH due to having higher ionic charge being responsible for the higher percentage of extraction of the metals. The results obtained in this work showed that it is possible to apply these polymers in the treatment of effluents containing heavy metals.

8
  • RAFFAEL ANDRADE COSTA DE MELO
  • "Study of leaching of printed circuit boards of obsolete desktops computers from the UFRN"

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • CARLSON PEREIRA DE SOUZA
  • ANDRE LUIS LOPES MORIYAMA
  • GILSON GARCIA DA SILVA
  • Data: 30-mar-2017


  • Resumen Espectáculo
  • The reduction of mineral reserves and the growing concern of society with the environment and sustainability brings exciting prospects in the areas of recycling of waste electrical and electronic equipment (WEEE). Therefore, this paper aims to develop a route to recycle metals present on the printed circuit boards (PCB) of obsolete desktops computers. For this, leaching tests were performed using different acids (nitric, regal water, hydrochloric and sulfuric), varying the parameters of temperature and molar concentration of the acid following a complete factorial experimental design of the type 2² with repetitions at the central point to evaluate the efficiency of the process through the percentage of leached mass obtained by gravimetric analysis. Furthermore, the samples before and after the leaching tests were analyzed by FRX, MEV and EDS to identify and quantify the main chemical elements as well as the morphology of the PCB samples used. The best results obtained in percentage terms of leached mass were obtained for nitric acid and royal water. The worst results were obtained for hydrochloric acid and sulfuric acid. The statistical study of nitric acid showed that the molar concentration of the acid was the only factor that had a significant effect on the response variable, there was no lack of fit and the estimated coefficient of correlation (R²) was close to unity for a first order model for the range of the factors tested. However, for the royal water the acid molar concentration and the temperature/concentration interaction were the two factors that had a significant effect on the response variable and the best model was the second order. Finally, the FRX reviews demonstrated which elements were or were not leached by each acid. Regal water has shown ease in dissolving practically all metals. The nitric acid dissolved copper, lead and calcium. Already the hydrochloric and sulfuric acid did not leach copper well, but were efficient in the dissolution of tin, iron and nickel.  In general, each acid was selective for different chemical elements present in the composition of the PCB and for this reason a viable recycling route based on this study is possible.

     

     

     

9
  • RUAN SÁVIO DA COSTA TERTULIANO
  • "Synthesis, characterization and kinetic evaluation of WC-Co cemented carbide through gas - solid reaction".

  • Líder : CARLSON PEREIRA DE SOUZA
  • MIEMBROS DE LA BANCA :
  • ANDRE LUIS LOPES MORIYAMA
  • CARLSON PEREIRA DE SOUZA
  • GILSON GARCIA DA SILVA
  • Data: 06-abr-2017


  • Resumen Espectáculo
  • The search for high value-added materials, wide applicability and high sustainability encourages innovation in all areas of engineering. One of the materials currently being developed with such requirements are the doped carbides, which are composed with a mix of  ceramics and metals. This work proposes the synthesis, characterization, kinetic evaluation and of tungsten carbide doped with cobalt (WC-Co) in fix and rotating bed reactor. The steps of material production was: synthesis of the precursor of washed by stirring in ethanol of a mixture of ammonium paratungstate and cobalt nitrate, drying th/e slurry obtained in oven for 18h at 80 °C, the dry powder milling, preliminary characterization by SEM techniques, XRD  and SDS, gas-solid reaction of reduction  at  750, 800 and 850 ° C in an atmosphere of 5% methane and 95% hydrogen in fix bed and  rotating bed reactor (at  34 rpm agitation) and the final characterization using the aforementioned techniques. The results show a material containing particles of tungsten carbide with cobalt adhered, with good interfacial and applicable in areas such as in catalysts, membrane reactors and fuel cells, which emphasizes the importance of such research.

     

10
  • JOÃO MILLER DE MELO HENRIQUE
  • "Germination and vigor of lettuce and sesame seeds in treated water treated by ionic flocculation and filtration"

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • MARCIO DIAS PEREIRA
  • SHIRLLE KATIA DA SILVA NUNES
  • RICARDO PAULO FONSECA MELO
  • Data: 07-abr-2017


  • Resumen Espectáculo
  • Given the increase in the generation of water produced (WP) by the oil industry, several countries that have activities related to exploration and production also suffer from water scarcity. On the other hand, agricultural irrigation is the main activity consuming water resources. In search of equation, to use residual waters in this activity presents a potential application. In this context, the objective of the present study was to study the effect on germination and vigor of lettuce (Lactuca sativa) and sesame seeds (Sesamum indicum) in several effluents: freshwater produced, treated water via ionic flocculation and filtration, besides Solutions containing each constituent of the water produced. Synthetic produced water was treated with 5 surfactant concentrations: 300, 350, 400, 450 and 500 ppm. After stabilization of the flakes, the solution was subjected to a filtration process, its influence being investigated in the process. Regarding the treatment, the removal of metals and oil were measured. For germination tests (G), first germination test (GPC), germination velocity index (IVG), shoot length (CPA), radicle length (CR), seedling length (CP) and dry mass (DM) were analyzed in parallel. Finally, inhibition curves for the constituents of the WP were plotted, in order to verify the limiting concentrations of these components in the germinations. After treatment of the WP with flocculation and filtration, up to 40% calcium was removed from the water produced. In relation to oil, the percentage of removal reached a value greater than 99%. Without filtration, only the concentration of 300 ppm of surfactant did not comply with the legislation (20 ppm). For low concentrations of organic matter, metals and salinity in the water produced, the process was efficient in the reuse of treated effluent for germination of lettuce and sesame seeds. The filtration did not present significant difference in the germination test. At the conclusion of the present dissertation, the objectives reached and the methodology employed presented a satisfactory performance to describe the germination behavior of two cultures in a produced water treated with ionic flocculation.

     

     

     

11
  • MAYRA KEROLLY SALES MONTEIRO
  • Obtention and Characterization of Bionanocomposits of Cassava Starch and Bentonite clay Organophilized by Mixing Surfactants

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • ANDRE EZEQUIEL GOMES DO NASCIMENTO
  • EDUARDO LINS DE BARROS NETO
  • FRANCISCO KLEBSON GOMES DOS SANTOS
  • SHIRLLE KATIA DA SILVA NUNES
  • Data: 28-jul-2017


  • Resumen Espectáculo
  •  RESUMO INGLÊS: Biofilms and edible coatings are thin layers of biodegradable materials applied to food products that play an important role in their preservation, distribution and commercialization. Cassava starch is one of the best candidates to obtain edible coatings, because it is a fully biodegradable polymer in soil and water, with easy production. However, starch has limitations in its physicochemical properties when compared to synthetic polymers. In turn, the improvement of these properties was proposed in this research from the addition of 5%, by mass, of clay in relation to the dry mass of biopolymer. The surface compatibilization of the clay with the biopolymer matrix was performed by surface modification in the presence of three types of surfactants (cetyltrimethyl ammonium bromide, sodium dodecyl sulfate and ethoxylated lauryl alcohol). O efeito de três modificações sequenciais na argila foi caracterizado por difração de raios X (DRX), transformada de fourier por radiação infravermelha (FTIR), microscopia eletrônica de varredura (MEV), espectroscopia de energia dispersiva de raios X (EDS), ângulo de contato (AC), potencial zeta (ZETA) e análise termogravimétrica (TGA). The clay modified synergistically in the three surfactants showed the greatest basal distance between the silicate layers, about 10 nm more than the natural clay. The cassava starch films with natural and modified clay were characterized as bionanocomposite intercalated or exfoliated by analysis of atomic force microscopy (AFM), optical microscopy (OM), XRD, FTIR, SEM and AC. The influence of modified and natural clay on the change in the physical-chemical properties of the original starch films was investigated for water vapor permeability, ductility, opacity, thermal stability and water solubility. The synergistically modified clay of the three surfactants was the reinforcement material that contributed the most to the physical-chemical properties of the control starch film, reducing 90.6% of water vapor permeability, as well as 77.43% Of maximum dissolution.

     

12
  • MAKEZIA MAYARA DA COSTA FREITAS
  • "STUDY OF THE REVERSE MICELLES FORMATION IN SYSTEMS NONIONIC SURFACTANT / ORGANIC SOLVENTS"


  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • MARIA CARLENISE PAIVA DE ALENCAR MOURA
  • RICARDO PAULO FONSECA MELO
  • Data: 27-oct-2017


  • Resumen Espectáculo
  • Unlike studies about the formation of direct micelles, which can be evaluated with simple techniques such as conductivity and surface tension, it is difficult to obtain good and reproducible data when it comes to the formation of reverse micelles. In recent decades, reverse micelles have been systematically used as templates for the synthesis of nanomaterials, due to their ability to self-aggregate in diverse structures, passing these characteristics to the desired material. Therefore, the present work had the objective of studying the effect of carbon chain length variation of the solvent, the degree of ethoxylation of the surfactants and the temperature in the formation of reverse micelles, with respect to the structural characteristics and c.m.c.. Small angle X-ray scattering was used to evaluate the micellar systems and nonylphenol ethoxylate surfactant was chosen as solute, being used solvents of different carbon chain length. A wide range of solvent-surfactant combinations were analyzed, the main results show that increasing the ethoxylation degree of the surfactant causes a decrease in c.m.c.. The maximum dimensions of the micellar aggregates followed an increase both with the positive variation of the degree of surfactant ethoxylation with: the increase of the carbon chain of the solvents, and the carbon chain length of the surfactant and the temperature. As regards the formats acquired by the aggregates, there was a predominance of flat structure variation, passing through a solid spherical and hollow spherical structure when concentration surfactant was reduced in the system.

13
  • ANDRÉ LUIS OLIVEIRA DE ALMEIDA
  • "Phase diagram of the nonylphenol / glycerol / diesel solution System"


     

  • Líder : EDUARDO LINS DE BARROS NETO
  • MIEMBROS DE LA BANCA :
  • EDUARDO LINS DE BARROS NETO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MANOEL REGINALDO FERNANDES
  • Data: 22-dic-2017


  • Resumen Espectáculo
  • The phase behavior of 6 systems, at temperature of 25 ° C and pressure of 1 atm, was investigated in this work by the construction of their respective diagrams. System I (diesel / solution 15% glycerol / R40/R60 surfactant mixture ratio 1: 2), system II (diesel / 15% glycerol solution / R40/R60 surfactant mixture ratio 1: 1), system III (diesel / 15% glycerol solution / R60), system IV (diesel / 15% solution glycerol / R40), system V (diesel / 0% glycerol / and the VI system (diesel / glycerin solution 30% / R40 Surfactant). All systems were treated as pseudo-ternary, since no system has only 3 pure components in its composition. All systems showed the area of isotropic stability. System I presented a considerable region of gel when compared to the other systems. In analyzing the systems IV, V and VI it was realized that the higher the glycerin concentration the lower the stable microemulsion region. The tielines of the IV and V systems were found and converged to a single point. Initially it was thought that the whole region below the binodal was of 2 phases, however the studies and later photos bought the existence of 3 phases and even of only 1 phase in that region in few spaces

     

Tesis
1
  • CHRISTIANE MARIA CHRISTINA NÓBREGA BAKKER
  • "Evaluation of the production and application of enzymes using wheat bran residue as a substrate by solid state 
     fermentation".
  • Líder : GORETE RIBEIRO DE MACEDO
  • MIEMBROS DE LA BANCA :
  • EVERALDO SILVINO DOS SANTOS
  • FRANCISCO CANINDE DE SOUSA JUNIOR
  • GORETE RIBEIRO DE MACEDO
  • JOSÉ ARAÚJO DANTAS
  • NATHALIA KELLY DE ARAUJO
  • SHARLINE FLORENTINO DE MELO SANTOS
  • Data: 16-mar-2017


  • Resumen Espectáculo
  • In order to point alternatives for wheat bran disposal destination generated in food industries sector, thus contributing with the reduction of the resultant impact of the deposition of residues in the environment. It has been evaluated in the present work the potential of the wheat bran as substrate for xylanase production by solid state fermentation using fungal consortiums as well as the Aspergillus oryzae (ATCC9362), Trichoderma reesei (2768), Bacillus cereus CCT nº 5457, from Fundação André Tosello-SP. The use of non-washed and non-autoclaved wheat bran as carbon and energy source on the solid state fermentation by the Aspergillus oryzae fungus showed greater percentage of the produced protein after 72 hours of cultivation. The use of a Central Composite Rotatable Design (CCRD) - 23 factorial planning with three repetitions at the central point as well as six axial points – coupled to Surface Response Methodology (SRM) allowed to assay the influence of humidity, pH and grain size (independent variables or factors) on the xylanase activity (dependent variable or response) as well as to optimize the best condition for the enzyme production. Results showed that all factors and their combination were significant at 95% confidence level. The optimized xylanase activity was (11.78 ±0,01) UI/g or (3.54) UI/mL obtained at 40% of humidity, pH 3.3 with grain size of 900.0µm. The produced broth was stable for 6 months and remained about (50%) of the initial xylanase activity at 4°C. SDS-PAGE assay showed that xylanase has 30 kDa molar mass. The obtained enzymatic broth was efficient to modify wheat flours as shown by the falling number rheologic parameters and alveography assay.

2
  • LUIZ ANTONIO DO NASCIMENTO
  • "Application of the polyacrylamide on flocculation of metallic cations"

  • Líder : MARCIA MARIA LIMA DUARTE
  • MIEMBROS DE LA BANCA :
  • ANDRE EZEQUIEL GOMES DO NASCIMENTO
  • DAMILSON FERREIRA DOS SANTOS
  • EDUARDO LINS DE BARROS NETO
  • JOSELISSE SOARES DE CARVALHO SANTOS
  • MARCIA MARIA LIMA DUARTE
  • RICARDO PAULO FONSECA MELO
  • Data: 26-may-2017


  • Resumen Espectáculo
  • The increase in the levels of contaminants agents of anthropic origin is associated to the development of industrial activity around the world. The action of the industries in this case, is caused by large volume of wastewater with high concentration or with a variety of contaminant. Heavy metals are generally seen as damage substances to human and animal health. However, they are increasingly being used in many important products to our day to day, this can to increasing numbers of people exposed to direct or indirect contamination. Contamination, and eventual poisoning, by heavy metals in some places is somewhat chronic, since their symptoms do not appear immediately, and the process is developed for a very long time. Therefore, several techniques to treatment have been developed to guarantee the maximum safety possible in discard these residues. One of the most commonly used techniques to treat metals dissolved in aqueous solution is a chemical precipitation. Adjustment of pH or addition of a flocculating agent is a basic condition to carry out this technique. Ionic polyacrylamide is an organic-based polymer having active sites in its chain able to uptake metal cations from an aqueous solution. In this work, it shows a zinc removal efficiency rise from 30 to 70% when the pH of the solution is incremented from 4.5 to 7.0 and exceeded 70% in tests with copper without variation in pH. In an action combined with CTAB, removal efficiency reaches 20% to 40%, with only one addition this surfactant at a concentration that was twofold the concentration of Zn2+ ions. The treatment of a real effluent from galvanic plant containing nickel and copper was analyzed, polyacrylamide shows to be more selective to copper whose removal efficiency reaches 30% while 10% is obtained for nickel without any other auxiliary compound. Polyacrylamide also acting well as an inhibitor of incrustation due to maintain Ca2+ ions in solution even at high temperature. Therefore, it can be said that polyacrylamide is polyvalent and is capable to accomplish the function of being a flocculating agent of metal cations dissolved in an aqueous solution.

     

     

3
  • SAULO HENRIQUE GOMES DE AZEVÊDO
  • "Production of biodiesel, in a continuous flow reactor, from cotton oil under supercritical conditions."

  • Líder : ELISA MARIA BITTENCOURT DUTRA DE SOUSA
  • MIEMBROS DE LA BANCA :
  • ANDERSON ALLES DE JESUS
  • ELISA MARIA BITTENCOURT DUTRA DE SOUSA
  • GILSON GOMES DE MEDEIROS
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MARCIONILA DE OLIVEIRA FERREIRA
  • RICARDO HENRIQUE ROCHA DE CARVALHO
  • Data: 01-sep-2017


  • Resumen Espectáculo
  • In the global energy context, biodiesel has emerged as an important source of renewable energy, mainly due to its ease of production and the variety of raw material available worldwide. Specifically in Brazil, the biodiesel industry has shown significant growth in production, due to the federal laws that require the mixing of B100 (biodiesel) with fossil diesel. Considering the importance of this industry to Brazil, this work sought to evaluate the potential of cotton seed oil for biodiesel production from three techniques: transesterification using ethanol, interesterification (using methyl acetate) and interesterification with methyl acetate and addition of aqueous acetic acid solution. The reactions occurred under supercritical conditions of temperature and pressure, in a continuous flow tubular reactor, with a volume of 15 mL. The maximum yield obtained by the transesterification was 75.05%, at the pressure of 150 and 200 bar, 375 °C, oil/ethanol molar ratio 1:40, and residence time 40 and 30 min, respectively. On the route using methyl acetate the highest yield was 99.51% (FAME (fatty acid methyl esters) + triacetin), obtained in 35 min, oil/methyl acetate ratio 1:3, pressure 200 bar and 350 °C using 20% aqueous acetic acid solution (26%). High values of biodiesel decomposition were observed in both routes due to the high concentrations of polyunsaturated triglycerides in the oil and the severe process conditions.

4
  • ENIO RAFAEL DE MEDEIROS SANTOS
  • "DEVELOPMENT OF EXTRATIVE PROCESSES FROM RUMEX ACETOSA AND CHEMICAL CHARACTERIZATION OF ITS EXTRACTS."

  • Líder : ELISA MARIA BITTENCOURT DUTRA DE SOUSA
  • MIEMBROS DE LA BANCA :
  • BENTO PEREIRA DA COSTA NETO
  • ELISA MARIA BITTENCOURT DUTRA DE SOUSA
  • ELISANGELA LOPES GALVAO
  • HUMBERTO NEVES MAIA DE OLIVEIRA
  • MARCIONILA DE OLIVEIRA FERREIRA
  • RICARDO HENRIQUE ROCHA DE CARVALHO
  • Data: 18-sep-2017


  • Resumen Espectáculo
  •  Researches presented in excess of free radicals as products of various diseases and cardiovascular diseases. In this context, the use of natural phenolic compounds by an item of excellent antioxidant activity and by inhibiting formation of radicals emerges. In the middle of the studies on the compounds, antioxidants: cis and trans-resveratrol, cis and trans-piceid and emodin gain prominence in the scientific environment. Scientific works prove the presence of phenolic compounds in the herbaceous "Azedinha" (Rumex acetosa), so its roots have been increasingly used in pharmacological applications. AEG, Microwave Extraction (MAE), solvent extraction (APE), microwave extraction (MAE), low pressure solvent extraction (LPSE). In SFE, it was evaluated the process variables, kinetics of extraction, yield and solubility of the extract. In the PLEs, both as evaluated, temperature and pressure, as an influence of the different solvents (water, ethanol, hexane, toluene, acetonitrile and isopropanol) and their use sequenced as sequenced PLE. The curves obtained in the SFEs and PLEs were adjusted according to the models: Martinez, Crank and Sovová and their calculated mean deviations. In the Soxhlet extraction the use of four solvents (ethanol, acetonitrile, isopropanol and butyl alcohol) was evaluated, whereas in LPSE and MAE extraction it was used as solvent. The use of supercritical anti-solvent (SAS) propagation as a form of drying has also been tested. The total phenolic content, the antioxidant capacity of the extracts and the main components of the μm extract determined. The yields obtained in all the techniques varied from 0.2 to 8.7%, being the best result obtained in the PLE extraction with ethanol. SUE presented the extract with the highest concentration of emodin (42.82 mg/g). The trans-resveratrol concentration in all extracts ranged from 1.03 to 5.57 mg/g, depending on the technique used. The antioxidant activity and the total phenolic compounds resulted in values between 3.48 and 163.43 μg/mL and 27.63 and 157.04 mgEAG/ge, respectively, depending on the technique used. MAE obtained extracts with 130.67 mgEAG/ge and 3.48 μg/mL in 30 minutes of operation. Extracts with pressurized fluids (PLEs and SFEs) showed excellent results, especially with respect to sequential extraction, where trans-resveratrol and emodine separation was possible, not with extraction of phenols of high and medium polarity, such as SFE.

5
  • ANGELINNE COSTA ALEXANDRINO
  • "Catalytic evaluation of coal derived from sewage sludge pyrolysis and molybdenum carbides materials for the production of biodiesel from methyl transesterification reaction of soybean oil at low pressure and temperature."

  • Líder : JOAO FERNANDES DE SOUSA
  • MIEMBROS DE LA BANCA :
  • JOAO FERNANDES DE SOUSA
  • CARLSON PEREIRA DE SOUZA
  • LUCIENE DA SILVA SANTOS
  • FRANCISCO WENDELL BEZERRA LOPES
  • JUAN ALBERTO CHAVEZ RUIZ
  • MOHAND BENACHOUR
  • Data: 29-sep-2017


  • Resumen Espectáculo
  • For decades, the production of environment-friendly fuels, as alternative power sources for oil, has gained attention and interest of researchers worldwide. Biodiesel is a renewable alternative fuel that can be obtained from residual oils, animal fat and vegetable oils through heterogeneous transesterification reaction using alcohol. In this context, heterogeneous catalyst present potential for biodiesel production as they can be regenerated and provide a cleaner and more efficient process. In this work, several molybdenum carbide catalysts were tested for the transesterification reaction of soybean oil with methanol towards producing biodiesel. These catalysts were pure Mo2C, Mo2C supported over activated carbon (A.C), pure A.C and bimetallic Ni (20%)-Mo2C/A.C being this support produced from sewage sludge pyrolysis. The pyrolysis product was treated with KOH, in order to increase its porosity and promote a larger specific surface area, and later physically activated. Gas solid reaction with CH4 and H2 atmosphere was used to produce the studied molybdenum derived catalysts, and ammonium molybdate was used as molybdenum source in all cases. All catalysts were characterized in a TG, XDR, XFR, SEM, B.E.T and laser particle size analysis basis. Their activity towards transesterification reaction was evaluated by using a mixing reactor with temperature control and alcohol reflux at 65 °C. The parameters that were manipulated for this experimental evaluation were: type and mass concentration of the catalyst (1, 2 and 5%), oil/alcohol ratio (1/6, 1/9, 1/12 and 1/18), pH (2.0; 4.0; 4.5; 5.0; 7.0; 8.0 and 8.5), reaction time (3 and 5h) and liquid phase agitation speed (450 and 600 rpm). For all conditions and other catalysts, biodiesel was produced. The maximum conversion found was 27.34% for the Mo2C/A.C catalyst under the operating conditions of 1% catalyst, 6 h reaction, oil/alcohol ration of 1/12 and pH = 5. A pseudo homogeneous kinetics model was proposed, and experimental data presented agreement with a 1st order reaction with speed rate constant of 0,0009 min-1.

6
  • TAMYRIS THAISE COSTA DE SOUZA
  • "Technical - economic analysis of methods of microemulsion injection in advanced oil recovery"

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • AFONSO AVELINO DANTAS NETO
  • ANTONIO ROBSON GURGEL
  • MARCOS ALLYSON FELIPE RODRIGUES
  • TEREZA NEUMA DE CASTRO DANTAS
  • TULIO YTERBIO FERNANDES VALE
  • VANESSA CRISTINA SANTANNA
  • Data: 11-oct-2017


  • Resumen Espectáculo
  • Abstract: Enhanced oil recovery methods are used to increase the productivity of reservoirs in which water or gas injections are inefficient, or can be used as a initial alternative to production. Among these methods are thermal, miscible and chemical methods. The use of advanced recovery chemical methods acts on the alteration of physicochemical rock / fluid properties, reducing the residual oil saturation and increasing the displacement of oil in the porous medium. Injection of chemical fluids, such as polymer solution, surfactant solution and microemulsion, seeks to increase the viscosity of injected fluid, decrease interfacial tension and increase miscibility between the injected fluid and the retained oil. Studies in this area show that chemical fluids are considered an effective alternative in the production of oil after the use of water or gas as an injection fluid. In this work the use of chemical fluids (surfactant and microemulsion solution) in the advanced oil recovery (EOR) with Ultramina NP200 as a surfactant was evaluated. Microemulsified systems are composed of: Ultramina NP200; n-Butanol; kerosene and local water supply. Microemulsion systems (SM) were characterized by measurements of particle diameter, surface tension, interfacial tension and viscosity. In the EOR tests, the influence of the injected surfactant concentration and the way in which surface tension, interfacial and viscosity influence the recovery of crude oil (29º API) were evaluated. The use of Ultramin NP200 solution has been able to increase the capacity of displacement of petroleum in relation to the injection of brine. However, the surfactant solution, despite the high concentration (25% m / m), obtained a lower recovery factor when compared to the microemulsion, even when the active matter concentration is low (1.0% - m / m). The recovery factor increased with increasing surfactant concentration in the microemulsion, but this growth was significant for SM injection with up to 6% (m / m) of surfactant. It has also been observed that satisfactory results of %OOIPA can be achieved by injecting smaller amounts of microemulsion followed by injection of brine. The use of the microemulsified system with 6% surfactant (SM4) with a flow rate of 0.5 mL / min, reached the oil recovery in place of 24.1% (% OOIPA) and total recovery of 77.2% (% OOIPT). In the economic evaluation it was observed that the use of small volumes of microemulsion, with higher concentration of surfactant, can result in a more viable project, by analyzing the price of a barrel of oil.

2016
Disertaciones
1
  • PRISCILLA CIBELLE OLIVEIRA DE SOUZA FIRMINO
  • "Influência de sistemas microemulsionados na molhabilidade de arenito e na recuperação avançada de petróleo"

  • Líder : TEREZA NEUMA DE CASTRO DANTAS
  • MIEMBROS DE LA BANCA :
  • TEREZA NEUMA DE CASTRO DANTAS
  • AFONSO AVELINO DANTAS NETO
  • MARCOS ALLYSON FELIPE RODRIGUES
  • ALEXANDRE GURGEL
  • Data: 27-ene-2016


  • Resumen Espectáculo
  • As rochas reservatório do tipo arenito são comumente responsáveis por acumulações de petróleo. A molhabilidade é um parâmetro fundamental para as propriedades físicas do reservatório, uma vez que interfere em características como a permeabilidade relativa à fase aquosa, a distribuição de óleo residual no reservatório, as características de exploração com inundações de água e