Evaluation of the photocatalytic activity of TiO2 films grown by mocvd technique
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2016
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BRAZILIAN MRS MEETING, 15th
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The presence of pollutants such as insecticides and antibiotics in wastewaters and
drinking water is nowadays one of the major environmental problems. Titanium
dioxide has emerged as an excellent photocatalyst for pollutant degradation. In
this research TiO2 films with thicknesses of 184, 395 and 720 nm were grown at
400ºC by metallorganic chemical vapor deposition (MOCVD) on borosilicate
substrates. Titanium isopropoxide IV was used both as titanium and oxygen
precursors. The films were analyzed by x-ray diffraction and the results suggested
that anatase was the only phase formed. The photocatalytic behavior of the TiO2
films on the degradation of methyl orange dye solution in different values of pH
was evaluated by spectrophotometry under UV irradiation. The results of the dye
degradation show that the lower the pH of the solution, the higher the efficiency
of the TiO2, independently of the thickness of the film. The best photocatalytic
performance was observed for films with 395 nm of thickness at pH 2.00, which
showed 65.3% of efficiency in the degradation of the dye. Similar result was
obtained by Duminica et al.1 that grew TiO2 films by MOCVD and reported the
best result for films with approximately 300 nm of thickness. According to these
authors, when the film is very thick and dense, most of the pairs electron/hole is
generated inside the film, and do not reach the surface, and when the film is very
thin, only a small portion of the incident light is absorbed by TiO2. Thus, there is
an optimal thickness to obtain the best results. The findings of the present study
permit to conclude that TiO2 films produced by MOCVD are promising for
application as photocatalyst material in the degradation of organic pollutants as
methyl orange dye.
Como referenciar
MARCELLO, BIANCA A.; GERIBOLA, GUILHERME A.; ARAUJO, EDVAL G.; PILLIS, MARINA F. Evaluation of the photocatalytic activity of TiO2 films grown by mocvd technique. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 944. Disponível em: http://repositorio.ipen.br/handle/123456789/27342. Acesso em: 12 Mar 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.