Banca de QUALIFICAÇÃO: JOSÉ EUDES LIMA SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOSÉ EUDES LIMA SANTOS
DATA : 13/06/2016
HORA: 09:00
LOCAL: Sala de reunião do NUP-ER
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:

To prepare Ti/TiO2-nanotube/PbO2 electrode by anodizing electrochemical and electroplating approaches for investigating the production of strong oxidizing species and electrochemical degradation of synthetic textile dye Acid Red 1. Material and Method: The TiO2 nanotubes were produced by anodizing electrosynthesis in organic-inorganic mixed 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 at Ti/Pt and Ti/TiO2-nanotube/PbO2 anodes was monitored by UV-visible spectrophotometric technique and chemical oxygen demand. Results: 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 at 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. Conclusion: 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 à Instituição - DAYANNE CHIANCA DE MOURA - UFRN
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 2087667 - TIAGO PINHEIRO BRAGA