Banca de DEFESA: ADRIANO MAGALHÃES NUNES FREITAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ADRIANO MAGALHÃES NUNES FREITAS
DATE: 09/02/2026
TIME: 08:30
LOCAL: Container 2 - sala de webconferência do IQ
TITLE:

STUDY OF ADSORPTION AND PHOTODEGRADATION IN THE REMOVAL OF ENVIRONMENTAL CONTAMINANTS IN AQUEOUS SYSTEMS: KINETICS AND EQUILIBRIUM

KEY WORDS:

Clay minerals; Removal; Adsorption; Photodegradation; Mathematical Models

PAGES: 108
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

Environmental pollution is an issue that has been addressed with great concern in scientific and technological circles in recent decades. In 2015, the UN established Agenda 2030, which presented 17 goals to achieve sustainable development objectives (SDGs), among which is combating climate change, with the development of technologies to ensure the production of drinking water, such as through the removal of chemical contaminants in water bodies and the treatment of industrial effluents. The use of natural and modified bentonite, palygorskite, and halloysite clay minerals for the removal of methylene blue dye (MB) and the drug tetracycline (TC), due to the high incidence of these contaminants in water bodies, was the focus of this study due to the environmentally friendly nature of the adsorbents and the high efficiency of contaminant removal with low investment costs for the method. These were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), textural analysis through N2 adsorption and desorption and thermogravimetric analysis (TG/DTG). The composite of the three clay minerals was obtained and applied in the adsorption of the dyes and drug studied in this work. The results obtained were very promising due to the maximum adsorption of contaminants and in less time, compared to the clay minerals applied individually, indicating a possible synergy in the combination of these materials, reaching Qm > 427,0 mg.g-1 for TC adsorption, with removal above 99% in 15 minutes. The most effective condition for photodegradation of the pharmaceutical residue was achieved under solar irradiation in the presence of the activator hydrogen peroxide, resulting in complete degradation of the residual molecules in less than 1 hour, with the kinetic behavior being best described by the Avrami–Erofeev model.

COMMITTEE MEMBERS:
Presidente - 1805556 - LUCIENE DA SILVA SANTOS
Interno - 1198847 - JOSE LUIS CARDOZO FONSECA
Externa ao Programa - 2614285 - KESIA KARINA DE OLIVEIRA SOUTO SILVA - UFRNExterno ao Programa - ***.491.864-** - RAFAEL VIANA SALES - UFRN
Externo à Instituição - CARLOS AUGUSTO CABRAL KRAMER - IFRN