Banca de DEFESA: ONÉCIMA BIATRIZ DE MEDEIROS RAMALHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ONÉCIMA BIATRIZ DE MEDEIROS RAMALHO
DATA : 31/05/2019
HORA: 15:30
LOCAL: Sala 4 - 1º Andar - ECT
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: 82
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

With the growth of the economy and industries, effluents are eliminated in the environment, grow exponentially, making it necessary to act in a socio-environmental way so that the waste disposed of does not cause damage to the environment or a society. Effluents from textile industries are not successful in your degradation by traditional treatment methods, making new methods to be researched and used. Advanced oxidative processes (AOPs) are an effective alternative to the degradation of organic pollutants and have been widely used because of their potential to clean effluents. TiO2 is a very abundant material in the earth's crust and has good photocatalytic properties, especially when coupled with metal and/or semi-metallic dopants and co-dopants. In this work, TiO2 nanoparticles were doped and co-doped with Fe+3 and Pb+2, using different concentrations of dopant ions. The samples were prepared by the sonochemical method and didn’t require a subsequent heat treatment. The phases were characterized by X-ray diffraction (XRD), the particle morphologies analyzed by transmission electron microscopy (TEM), and the optical properties by UV-Vis spectroscopy (UV-Vis) and surface area by BET method. The photocatalytic activity was verified by the degradation of methylene blue dye (MB) irradiated by UV radiation and sunlight radiation and the antimicrobial activity compared to gram positive (Staphylococcus aureus) and gram negative bacteria (Escherichia coli). The XRD patterns exhibited only the anatase phase of TiO2, even using the maximum percentage of dopants. TEM analysis showed that the particles of pure TiO2 are agglomerated and that with the addition of the Fe3+ ion these particles are deagglomerated. UV-Vis analysis showed that the addition of dopants in the titania lattice reduces the band energy (Egap) and surface area decreased with the introduction of dopants. The results of the photocatalysis tests indicated that the addition of dopants and co-dopants improved photocatalytic activity for compositions with concentrations below 1% in UV light and up to 1% in sunlight. The antimicrobial activity was also investigated and samples TiO2:1%Fe:3%Pb, TiO2:1% Pb:1%Fe and TiO2:1%Pb:3%Fe showed a zone of inhibition, indicating the antibacterial effect of the samples synthesized.

MEMBROS DA BANCA:
Interno - 1300987 - CARLOS ALBERTO PASKOCIMAS
Presidente - 1802888 - FABIANA VILLELA DA MOTTA
Externo à Instituição - VINÍCIUS DANTAS DE ARAÚJO - UFRPE