Banca de DEFESA: JOSÉ EUDES LIMA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOSÉ EUDES LIMA SANTOS
DATA : 27/07/2016
HORA: 15:00
LOCAL: Auditório do NUPPRAR
TÍTULO:

PREPARATION OF ANODE OF TiO2-NANOTUBES DECORATED WITH PbO2: Electrochemical generation of Strong oxidant species and its electrochemical application for removing Acid Red 1 dye

PALAVRAS-CHAVES:

RNO, TiO2 Nanotubes, Hydroxyl Radical, Persulfate, Anodic Oxidation, Acid Red 1.

PÁGINAS: 100
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Eletroquímica
RESUMO:

This study aimed to prepare the Ti/TiO₂-nanotube/PbO₂ electrode by anodizing electrochemistry and electroplating and investigate the production of strong oxidizing species that electrode and electrochemical degradation of synthetic textile dye Acid Red 1. Therefore, the TiO₂ nanotubes were produced by electrochemical anodizing in organic-inorganic electrolyte. This material was calcined and characterized by SEM and XRD techniques. So, it was decorated with PbO₂ by electrodeposition and characterized by potentiodynamic measurements. The determination of strong oxidizing species was performed by ISCO method (persulfate) and RNO spin trapping reaction (hydroxyl radical). The galvanostatic electrolysis of synthetic dye in anodes Ti/Pt and Ti/TiO₂-nanotube/PbO₂ was monitored by UV-visible spectrofotometry and chemical oxygen demand. It was found that the Ti/TiO₂-nanotube/PbO₂ electrode has a high overpotential for the reaction of oxygen evolution is a bad electrocatalyst for this reaction. Furthermore, a significant production of hydroxyl radicals and persulfate is achieved in Ti/TiO₂-nanotube/PbO₂ compared to Ti/Pt mainly current density of 60 mA cm^-2. It also showed better performance in the removal of AR1, reached higher oxidation rate, greater energy efficiency and consuming less energy. Therefore, the electrode Ti/TiO₂-nanotube/PbO₂ exhibits good catalytic properties for environmental applications, such as anodic oxidation. Furthermore, the concentration of the oxidizing electrode was dependent on the material and the anodic oxidation conditions.

MEMBROS DA BANCA:
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externo ao Programa - 047.190.874-69 - DAYANNE CHIANCA DE MOURA - UFRN
Externo à Instituição - RENATO ALEXANDRE COSTA DE SANTANA - UFCG
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 2087667 - TIAGO PINHEIRO BRAGA