Enhanced Sonocatalytic Degradation of Rhodamine B by Graphene-TiO2 Composites Synthesized by an Ultrasonic-Assisted Method

doi:10.1016/S1872-2067(11)60430-0

Abstract

Abstract: A series of graphene-TiO₂ composites was fabricated from graphene oxide and titanium n-butoxide (TNB) by an ultrasonic-assisted method. The structure and composition of the nanocomposites were characterized by Raman spectroscopy, BET surface area measurements, X-ray diffraction, transmission electron microscopy, and ultraviolet-visible absorption spectroscopy. The average size of the TiO₂ nanoparticles on the graphene nanosheets was controlled at around 10–15 nm without using surfactant, which is attributed to the pyrolysis and condensation of dissolved TNB into TiO₂ by ultrasonic irradiation. The catalytic activity of the composites under ultrasonic irradiation was determined using a rhodamine B (RhB) solution. The graphene-TiO₂ composites possessed a high specific surface area, which increased the decolorization rate for RhB solution. This is because the graphene and TiO₂ nanoparticles in the composites interact strongly, which enhances the photoelectric conversion of TiO₂ by reducing the recombination of photogenerated electron-hole pairs.

Key words: grapheme, ultrasonication, sonocatalytic degradation, adsorption, rhodamine B

ZHU Lei, Trisha GHOSH, Chong-Yeon PARK, MENG Ze-Da, OH Won-Chun. Enhanced Sonocatalytic Degradation of Rhodamine B by Graphene-TiO₂ Composites Synthesized by an Ultrasonic-Assisted Method[J]. Chinese Journal of Catalysis, 2012, 33(8): 1276-1283.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(11)60430-0

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Enhanced Sonocatalytic Degradation of Rhodamine B by Graphene-TiO₂ Composites Synthesized by an Ultrasonic-Assisted Method

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