Banca de QUALIFICAÇÃO: THAIS SALES PINHEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : THAIS SALES PINHEIRO
DATE: 15/12/2023
TIME: 14:00
LOCAL: https://meet.google.com/fpa-tzpj-frr
TITLE:

SYNTHESIS AND CHARACTERIZATION OF GRAPHENE OXIDES TO OBTAIN TiO2/rGO NANOTUBE.

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

The titanium dioxide (TiO₂) has some interesting properties, including non-toxicity, high availability, high cost-effectiveness, good biocompatibility, and good chemical stability, which makes it interesting for applications in several areas. TiO₂ nanotube matrices are particularly useful in processes involving photocatalysis such as pollutant degradation, H₂ generation and self-cleaning surfaces. However, TiO₂ has a restricted photocatalytic efficiency due to its wide bandgap (3.2 eV), which limits its absorption in the ultraviolet radiation region, corresponding to only 4-7% of the solar spectrum radiation. To improve the photocatalytic efficiency of TiO₂, many researchers have explored some methods to reduce the bandgap value of this material, among them, the addition of graphene oxide (GO) as a co-adsorbent. GO has a good specific surface area and strong light absorption properties, which can improve the photocatalytic efficiency of TiO₂, however, it has many oxygen-containing functional groups, which impair its electronic properties. Therefore, research is aimed at promoting the reduction of GO to reduced graphene oxide (rGO), which has a smaller number of functional groups, thus recovering the electronic properties of the material, such as its mobility of charge carriers. From that, this research was directed towards the synthesis and characterization by various techniques of analysis of the 3-hour graphene oxide, done through the Hummers method modified and improved by the team, and its subsequent reduction on TiO₂ nanotubes, using the technique of dip coating for its deposition and later performing the thermal reduction technique in a muffle furnace, of low cost, with different temperature values (400/420/450/470/500/520°C) for 2 and 5 hours.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 2226644 - LUCAS ALMEIDA MIRANDA BARRETO
Membro Titular - Examinador(a) Interno ao Programa - 2604737 - EVERALDO CARLOS VENANCIO
Membro Titular - Examinador(a) Externo ao Programa - 1734912 - ROOSEVELT DROPPA JUNIOR
Membro Suplente - Examinador(a) Interno ao Programa - 1646041 - CARLOS TRIVENO RIOS
Membro Suplente - Examinador(a) Externo ao Programa - 3066318 - JULIAN ANDRES MUNEVAR CAGIGAS