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

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

催化学报 ›› 2012, Vol. 33 ›› Issue (8): 1276-1283.DOI: 10.1016/S1872-2067(11)60430-0

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

ZHU Lei, Trisha GHOSH, Chong-Yeon PARK, MENG Ze-Da, OH Won-Chun*

Department of Advanced Materials Science & Engineering, Hanseo University, Chungnam 356-706, Korea

收稿日期:2012-02-18 修回日期:2012-03-20 出版日期:2012-08-01 发布日期:2012-08-01

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

ZHU Lei, Trisha GHOSH, Chong-Yeon PARK, MENG Ze-Da, OH Won-Chun*

Department of Advanced Materials Science & Engineering, Hanseo University, Chungnam 356-706, Korea

Received:2012-02-18 Revised:2012-03-20 Online:2012-08-01 Published:2012-08-01

摘要/Abstract

摘要： 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.

关键词: grapheme, ultrasonication, sonocatalytic degradation, adsorption, rhodamine B

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]. 催化学报, 2012, 33(8): 1276-1283.

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

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

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