Synthesis and characterization of reduced graphene oxide-modified anatase TiO2 photocatalysts grown by MOCVD
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2019
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E-MRS SPRING MEETING; IUMRS-ICAM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS
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Inadequate disposal of industrial waste, such as textile dyes and emerging contaminants, have been
caused several environmental hazards. Titanium dioxide (TiO2) photocatalysis is an efficient green
method for water treatment by solar energy. However, due to its large band gap of 3.2 eV, TiO2
absorbs mostly the UV radiation, which represents only 5-8% of the sunlight spectrum. Recent studies
indicate that the surface modification of TiO2 results in an increase in photocatalytic efficiency. In
this way, the present paper aims to evaluate the effects of TiO2 surface modification by reduced
graphene oxide (rGO). The 470 nm thick anatase-TiO2 films were grown by MOCVD process in a
conventional horizontal homemade reactor, on borosilicate substrates at 400 °C. The TiO2 films
obtained were dipped into an alkoxide solution including 0.5, 1.5 and 3.0 mg of rGO and 30 mL
isopropanol, ultrasonic-treated at room temperature for 40 min, and then dried in an oven at 100 and
150 °C for 24 h. The photocatalytic activity of rGO-TiO2 composites were evaluated by the methylene
blue degradation under UV and visible light. The chemical, structural and morphological properties
were also characterized. It was observed the presence of rGO agglomerates completely adhered to
TiO2 surface. The diffraction peaks identified correspond to anatase phase. Peaks of graphene were
also found. The results suggest that the rGO-TiO2 composites have a great potential to be used in
water treatment under sunlight.
Como referenciar
BENTO, RODRIGO T.; SILVA FILHO, JORGE C.; CORREA, OLANDIR V.; TAKIISHI, HIDETOSHI; PILLIS, MARINA F. Synthesis and characterization of reduced graphene oxide-modified anatase TiO2 photocatalysts grown by MOCVD. In: E-MRS SPRING MEETING; IUMRS-ICAM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS, May 27-31, 2019, Nice, France. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/30970. 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.