Banca de QUALIFICAÇÃO: ONÉCIMA BIATRIZ DE MEDEIROS RAMALHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ONÉCIMA BIATRIZ DE MEDEIROS RAMALHO
DATA : 12/11/2018
HORA: 09:00
LOCAL: Sala F1 do Setor de Aula IV
TÍTULO:

STUDY OF PHOTOCATALITICAL AND ANTIMICROBIAL ACTIVITY OF TiO2 DOPED WITH FE+3 AND Pb+2 OBTAINED BY SONOCHEMICAL METHOD

PALAVRAS-CHAVES:

TiO2, doping, co-coping, photocathalysis, antimicrobial activity

PÁGINAS: 74
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

The industrial growing, which has been put forward by economic developments, has increased the amount of liquid effluent discarded on the environment, which unless are properly treated prior to discarding, the environmental imbalance may be dangerous. Effluents provided by textile industries are of hard degradation when classical treatments are applied, thus demanding development of new methods. Advanced oxidative processes (AOPs) have been applied as alternative for pollutants degradation. Titanium dioxide (TiO2) is very abundant and it has been investigated due to photocatalytic properties, mainly when applied with metallic and/or semi-metallic dopants and co-dopants. In this work, nanoparticles of TiO2 were doped and co-doped using Fe+3 and Pb+2, and vice versa, with percentages of 1 mol%, 3mol% and 7mol%. Samples were prepared under sonochemical method and a further thermal treatment is unnecessary. The obtained phases have been characterized by X-Ray Diffraction; Morphology of particles were analyzed by Transmission Electron Microscopy (TEM) and the optical properties were examined with UV-vis. Photocatalytic activity has been measured based on methylene blue (MB) degradation under UV radiation, and antimicrobial activity against to bacterial growing of gram positives (Staphylococcus aureus) and gram negatives (Escherichia coli) bacteria. X-ray patterns exhibited only the TiO2 anatase, even for maximum amount of dopants. TEM analysis showed particles of pure TiO2 was found to be agglomerated, and after addition of Fe3+ ion, these particles showed themselves deagglomerated, as well as the particle size is reduced. UV-vis analysis indicated reduction in the gap after dopant addition on the TiO2. Photocatalysis tests suggested the addition of dopants and co-dopants reduces photocatalytic activity in comparison to pure TiO2. Microbial activity was also investigated and the samples showed an inhibition area, thus indicating the antibacterial effect, while other samples did not show satisfactory this effect.

MEMBROS DA BANCA:
Presidente - 1802888 - FABIANA VILLELA DA MOTTA
Interno - 1883170 - MAURICIO ROBERTO BOMIO DELMONTE
Externo à Instituição - VINÍCIUS DANTAS DE ARAÚJO - UFRPE