Photocatalytic performance of Ag-TiO2 films under visible light
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2024
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BRAZIL MRS MEETING, 22nd
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Resumo
Water pollution caused by the disposal of organic substances such as dyes, pesticides and
antibiotics seriously affects the quality of water resources and, consequently, human health.
Advanced oxidative processes present themselves as an effective alternative for removing
these contaminants from water. In this work, the photocatalysis performance of Ag-TiO2
films under visible light in the removal of methyl orange dye was studied. The films were
obtained from a solution containing titanium isopropoxide (IV) and ethyl alcohol in a ratio of
1:10 (v:v). The solution was kept under constant stirring at 70 °C for 60 min. Subsequently,
the sol was deposited on borosilicate glass using an airbrush. The films were heat treated
for 30 minutes at 500 ºC in a muffle furnace and then immersed for 30 minutes in an
aqueous solution of 0.1 mol.L-1 of AgNO3, followed by rinsing in deionized water and
drying. After that, these films were subjected to UVC radiation for periods of 60, 90, 120
and 150 minutes to allow the reduction of Ag+ to Ag0. X-ray diffraction and scanning
electron microscopy techniques were used to characterize the films. In the photocatalysis
tests, it was observed that the longer the irradiation time of the catalyst in UVC light, the
better its photocatalytic performance, quantified by spectrophotometry, considering the
discoloration of the methyl orange dye (5 mg.L-1). The best performance was attributed to
the film subjected to 120 minutes of exposure to UVC light, reaching 80% of degradation
after 300 minutes of exposure to visible light.
Como referenciar
SANTOS, DAVI R. dos; COTINHO, SAMUEL P.; OLIVEIRA, LEANDRO da S.; GODOI, CAMILA; PILLIS, MARINA F. Photocatalytic performance of Ag-TiO2 films under visible light. In: BRAZIL MRS MEETING, 22nd, September 29 - October 3, 2024, Santos, SP. Abstract... São Carlos, SP: Aptor Software, 2024. p. 529-529. Disponível em: https://repositorio.ipen.br/handle/123456789/48950. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.