Banca de QUALIFICAÇÃO: KARLA CAROLINE DE FREITAS ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : KARLA CAROLINE DE FREITAS ARAÚJO
DATA : 24/10/2016
HORA: 09:00
LOCAL: Sala de treinamento do NUP-ER
TÍTULO:

STUDY OF DIFFERENT MECHANISMS FOR PRODUCING PERSULFATE BY USING BORON DOPED DIAMOND ANODES

PALAVRAS-CHAVES:

SDS, BDD, SODIUM SULFATE, PERSULFATE

PÁGINAS: 65
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Eletroquímica
RESUMO:

The persulfate (S₂O₈^2-), also known as peroxydisulfate ion, is a strong oxidant and has been used for the degradation of organic pollutants in wastewater sewage treatment plants, water with high content of synthetic dyes (textile industry and food), and soil contaminated by oil, among others. So this paper uses the electrochemical oxidation with boron doped diamond anode (BDD) for further study of persulfate generation of reactions that occurs in situ and streaming. For such studies have been developed a micro and macro BDD electrode as an anode to conduct the electrolysis experiments, and oxidation with sulfuric acid (H₂SO₄), sodium dodecyl sulfate (SDS) and sodium sulfate (Na₂SO₄) in different concentrations. The results showed that hydroxyl radicals can be generated electrochemically at the anode at high concentrations of BDD favor secondary reactions such as the formation of oxygen. However from the results obtained, the favored reaction is the production of persulfates, then identified by spectrophotometry, minimizing oxygen production and enables the opening of persulfate formation. Therefore it can be concluded that the persulfate production is feasible from the reaction between the radical ^•OH and SO₄^-2 in solution. No formation of oxygen in certain concentrations, was the key to the completion of the persulfate being formed by two different mechanisms. Another important result was the SDS, it was observed that there is a good production persulfate, in the absence of surfactant. However this production increases when it is added to the synthetic solution of Na₂SO₄ and / or when applied greater current density.

MEMBROS DA BANCA:
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externo à Instituição - CÁTIA GUARACIARA FERNANDES TEIXEIRA ROSSI - FANEC
Interno - 348475 - DJALMA RIBEIRO DA SILVA