Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 408, Issue -, Pages 145-150Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.07.045
Keywords
Microwave-assisted reaction; Bi2O3-RGO; Photocatalysis; Methylene blue; Methyl orange
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Funding
- Special Project for Nanotechnology of Shanghai [11nm0501200]
- Scholarship Award for Excellent Doctoral Student
- Ministry of Education [MXRZZ2012006]
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Bi2O3-reduced graphene oxide (RGO) composites were successfully synthesized via microwave-assisted reduction of graphite oxide in Bi2O3 precursor solution using a microwave system. Their morphologies, structures, and photocatalytic performance in the degradation of methylene blue (MB) and methyl orange (MO) were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectroscopy, UV-vis absorption spectroscopy, and electrochemical impedance spectroscopy, respectively. The results show that the RGO addition can enhance the photocatalytic performance of Bi2O3-RGO composites. Bi2O3-RGO composite with 2 wt.% RGO achieves maximum MO and MB degradation rates of 93% and 96% at 240 min under visible light irradiation, respectively, much higher than those for the pure Bi2O3 (78% and 76%). The enhanced photocatalytic performance is ascribed to the increased light adsorption and the reduction in electron-hole pair recombination in Bi2O3 with the introduction of RGO. (C) 2013 Elsevier Inc. All rights reserved.
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