Banca de DEFESA: VÁLBER RODRIGO RIBEIRO DE MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : VÁLBER RODRIGO RIBEIRO DE MEDEIROS
DATE: 15/05/2020
TIME: 14:00
LOCAL: VIRTUAL
TITLE:

Kinetic study of the phodegradation reaction of organic matter in domestic sewage using TiO₂, Nb₂O₅ e WO_3.

KEY WORDS:

Domestic Sewage; Removal of Organic Matter; Heterogeneous Photocatalysis; Kinetics. 

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Orgânicos
SUMMARY:

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.

BANKING MEMBERS:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Externa ao Programa - 1415657 - ANDREA OLIVEIRA NUNES
Externa ao Programa - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa à Instituição - MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA - IFRN