Influence of the heat treatment on the photodegradation efficiency of the supported TiO2 catalysts obtained by a facile airbrush spray-coating
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2019
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BRAZIL MRS MEETING, 18th
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Resumo
One of the main topics of thin films processing routes based on sol-gel is the need
for low-cost and simple techniques [1]. Airbrush spray-coating method has been
applied to coat materials, due to its cost-effective, large area and versatile
characteristics [2]. However, this technique is not yet sufficiently explored for
supported catalysts employed on the water treatment. In this work, titanium
dioxide (TiO2) films were successfully deposited on borosilicate substrates by a
facile airbrush spray-coating technique, at room temperature, from a solution of
titanium (IV) isopropoxide diluted in isopropanol. The angle of the cold spray was
fixed in 45°, and the feed rate was 17 mm.s-1. The coated specimens were dried at
100 °C for 60 min, and then heat treated at 300, 450 and 500 °C for 30 min to
evaluate the influence of the temperature process on the methyl orange dye
degradation under UV light. The catalysts obtained showed a great surface
covering, highly porous surface, and good adherence to substrate. The films
presented the formation of TiO2-anatase phase. Methyl orange dye degradation
experimental results indicated that the TiO2 film heat treated at 500 °C presented
a higher photocatalytic behavior, that exhibited 68.3 % of the dye degradation for
300 minutes under UV radiation – around 18.5 % more efficient than the
supported catalysts prepared at 300 and 450 °C, with a photocatalytic efficiency
of 31.6 % and 57.7 %, respectively. The study of the influence of heat treatment
on the photocatalytic activity suggests the existence of an ideal temperature in
which the photocatalyst exhibits the better photodegradation performance. The
results suggest that the supported TiO2 catalysts deposited by the airbrush spraycoating
method have a promising practical application for the green treatment of
organic pollutants.
Como referenciar
BORAZANIAN, TATYANA C.F.; CORREA, OLANDIR V.; BENTO, RODRIGO T.; PILLIS, MARINA F. Influence of the heat treatment on the photodegradation efficiency of the supported TiO2 catalysts obtained by a facile airbrush spray-coating. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 1665-1666. Disponível em: http://repositorio.ipen.br/handle/123456789/31032. Acesso em: 19 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.