Banca de DEFESA: ELANO COSTA SILVA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : ELANO COSTA SILVA
DATE: 02/09/2024
TIME: 14:30
LOCAL: Google meet
TITLE:
KEY WORDS:
Lignin. Adsorption. Produced water. Dye. Corn cob.
PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:
The growth of the global population and the increase in per capita consumption have driven the industrial sector to expand its production of goods and services. Consequently, the production of pollutants has also risen, and improper disposal of these pollutants into the environment can impact human health and ecosystems. Produced water from oil wells is a significant byproduct of oil extraction. This water is naturally present in subsurface reservoirs and is brought to the surface along with the oil during production. Typically, produced water contains a variety of substances such as salts, heavy metals, and organic compounds. Polluted water with dyes from the textile industry has also attracted researchers' interest due to its environmental relevance. During the dyeing process of fabrics and fibers, various chemical dyes are used to impart vibrant colors to clothing items. However, a significant portion of these dyes is not absorbed by the textile fibers and ends up being discarded with the wastewater, resulting in contaminated effluents. To mitigate these issues, recent studies have focused on using lignin as an adsorbent material for contaminant removal. Lignin shows promise due to its abundance in nature, being the second most abundant biopolymer after cellulose, and its presence of multiple functional groups along its polymeric chain. Brazil is one of the world's largest producers of corn, and associated with grain production is the generation of a large volume of corn cobs, which contains about 15% lignin. In this context, the present work aims to study the use of modified lignin extracted from corn cobs as an adsorbent material for pollutants in contaminated effluents. Initially, lignin was extracted from corn cob biomass through physical and chemical treatments. Subsequently, lignin was modified with various reagents to enhance its interaction capacity for contaminant removal. Regarding oil removal, spheres made from modified lignin showed better efficiency than those made from unmodified lignin or without lignin. The best result for removing total oil and grease (TOG) was observed with ELMC, achieving a removal percentage of 90%, followed by ELOX with 88.23%. ELNM achieved 84%, and EALG reached 45.83%. In terms of the adsorption process for Congo red dye, the adsorption kinetics study indicated that the pseudo-second-order model best fit the data. The PSO model showed R² values closest to unity and demonstrated the ability to predict the value of qeq_eqe. The qeq_eqe for LNM at concentrations of 50, 100, and 250 mg/L were 35.54, 66.58, and 155.24 mg/g, respectively, while for LMC at the same concentrations, the qeq_eqe values were 33.89, 65.95, and 165.79 mg/g.
COMMITTEE MEMBERS:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Interno - 3304882 - CARLOS EDUARDO DE ARAÚJO PADILHA
Interno - ***.674.113-** - DENNYS CORREIA DA SILVA - UFRN
Externo ao Programa - 1198847 - JOSE LUIS CARDOZO FONSECA - UFRNExterno à Instituição - HARVEY ALEXANDER VILLA VÉLEZ - UFMA