Banca de DEFESA: OZANIRA SOARES MACIEL

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : OZANIRA SOARES MACIEL
DATA : 29/07/2022
HORA: 08:00
LOCAL: Google Meet: https://meet.google.com/kis-vuzf-aix
TÍTULO:

ELECTROCHEMICAL DEGRADATION OF CAFFEINE AND SIMULTANEOUS GENERATION OF GREEN H2 USING DIFFERENT ANODES.

PALAVRAS-CHAVES:

Caffeine. Active and non-active anodes. Electrochemical treatment. green hydrogen.

PÁGINAS: 72
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Several studies prove that caffeine is a persistent chemical substance with toxic effects on the environment, indicating, therefore, the real need for its degradation in domestic wastewater. In this way, the development of efficient techniques for water treatment and removal of emerging high solubility markers is of great importance due to the management of environmental and health risks. As a methodology, experimental conditions were used in order to achieve better results, as well as the intrinsic parameters of each technique used. The investigative techniques applied were UV-vis Absorption Spectroscopy, to determine the concentration of caffeine and quantify the generation of persulfate generated in the system, and Differential Pulse Voltammetry, as an additional technique for quantification of the compound under study. Variables such as electrolytes, anodes and current densities were investigated during the application of the electrochemical treatment, in order to verify the behavior of caffeine degradation and simultaneous evolution of green H2 produced in the system, since hydrogen has been widely explored and is still considered the fuel of the future. It should be noted that the entire system worked from photovoltaic energy, with the expectation of reducing the costs arising from its application. As a result of the degradation of caffeine, it was possible to observe that the best electrolyte and anode applied were Na2SO4 0.5 mol L-1 and BDD, respectively. In terms of current density, the one that presented the best results was the one of 45 mAcm-2, which favored the generation of a greater amount of hydroxyl radicals, promoting a greater removal of the compound under study, in addition to the greater production of green H2, this which directly depends on the applied current and the electrolysis time. Finally, the objective of this research was to verify which electrolyte and anode would generate more promising results in the degradation of an effluent contaminated with caffeine, proving the efficiency of electrochemical treatment in wastewater and, in addition to this, highlighting the feasibility of integrating hydrogen production in the effluent treatment associated with the use of solar energy.

MEMBROS DA BANCA:
Presidente - 12281 - VINICIUS PATRICIO SANTOS CALDEIRA
Externa ao Programa - 12993 - DANYELLE MEDEIROS DE ARAÚJO
Externo à Instituição - DIOGO PEREIRA BEZERRA - IFRN
Externo à Instituição - ELISAMA VIEIRA DOS SANTOS