S-doped TiO2 films applied to UV-Vis heterogeneous photocatalysis
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
Semiconductors materials such as titanium dioxide (TiO2) have been applied
successfully on photocatalytic process for water treatment [1]. Sulfur doping
allows the reduction of the TiO2 band gap energy, and changes the absorption
edge from the UV to the visible light region, thus obtaining a higher
photocatalytic activity [2]. The aim of this research was to study the
photocatalytic behavior of sulfur-doped and undoped TiO2 films in the methyl
orange dye degradation under UV and visible radiation. The titanium dioxide films
were grown on borosilicate substrates, by metalorganic chemical vapor deposition
(MOCVD) technique at 400 °C. The doping step was done in a tubular furnace
under H2/2 wt.% H2S atmosphere at 50 °C, 100 °C and 150 °C for 60 minutes. All
the films presented on their surfaces the formation of well-defined rounded
grains. X-ray diffraction analyses shown that S-TiO2 and TiO2 films exhibited the
formation of anatase phase, which suggests that the doping process do not causes
meaningful changes in the structure of TiO2 films. MO dye degradation tests
indicated that the S-TiO2 films present photocatalytic activity both under UV
radiation and visible light. S-TiO2 film doped at 50 °C presented the higher
photocatalytic performance, and exhibited 72.1 % of MO dye degradation for a
total test time of 300 minutes under visible light. Undoped TiO2 film demonstrated
photoactivity only under UV light, with an efficiency of 63.5 %. The photolysis
curve showed that without the presence of the catalyst there was no degradation
of the dye under both UV radiation and visible light. The results suggest that the
sulfur doping caused a shift of the TiO2 absorption edge to the visible region,
which allows their practical application under sunlight or visible light bulbs.
Como referenciar
BENTO, RODRIGO T.; CORREA, OLANDIR V.; PILLIS, MARINA F. S-doped TiO2 films applied to UV-Vis heterogeneous photocatalysis. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 825-825. Disponível em: http://repositorio.ipen.br/handle/123456789/29467. Acesso em: 18 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.