Effect of the thickness of TiO2 films on the photodegration of methyl orange dye
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2019
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BRAZIL MRS MEETING, 18th
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Resumo
The increase of the disposed of azo dyes such as methyl orange (MO) by textile
and allied industries in the wastewater results in a significant increase of
pollutants, which requires the development of new degradation materials and
techniques to purify the effluents [1]. Heterogeneous photocatalysis using
titanium dioxide (TiO2) films is a highly efficient oxidative process for water
treatment [2]. The TiO2 films were grown on borosilicate substrates by
metalorganic chemical vapor deposition (MOCVD) at 500°C, and the growth time
was controlled in order to obtain films with the thickness of 400, 600 1100 and
2100 nm. MO dye degradation was evaluated by using anatase-TiO2 as
photocatalyst under UV light. The pH of the solutions was set on 2. The TiO2 films
presented uniform thickness and well-defined columnar structure that grow
perpendicular to the substrate surface. The increasing of the growth time
increases both the thickness and the mean grain size of the films. All the films
presented the formation of anatase-TiO2 crystalline phase grown preferentially
oriented at (112). The results showed that the photocatalytic behavior of the films
decreased with increasing the film thickness. The photocatalytic efficiency for the
400, 600, 1100 and 2100 nm films tested at pH 2 are respectively 39.2%, 30.2 %,
24.4 % and 12.2 %. When the thickness of the films augments, the mobility of the
electrons is impaired due to the increase of the film opacity, which limits the light
penetration through the catalyst, and difficults the diffusion of charge carriers
required to activate the semiconductor surface. TiO2 catalysts grown by MOCVD
technique is a practical promising application for the water treatment.
Como referenciar
MARCELLO, BIANCA A.; CORREA, OLANDIR V.; BENTO, RODRIGO T.; PILLIS, MARINA F. Effect of the thickness of TiO2 films on the photodegration of methyl orange dye. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 1696-1696. Disponível em: http://repositorio.ipen.br/handle/123456789/31031. Acesso em: 20 Apr 2024.
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.