Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 219, Issue -, Pages 13-18Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.12.033
Keywords
TiO2; Graphene; Photocatalysis; Photoelectrochemistry; Methylene blue
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Funding
- WCU (World Class University) through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-10013]
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The titanium dioxide (TiO2) nanorod-decorated graphene sheets photocatalysts with different TiO2 nanorods population have been synthesized by a simple non-hydrolytic sol-gel approach. Electron microscopy and X-ray diffraction analysis indicated that the TiO2 nanorods are well-dispersed and successfully anchored on the graphene sheet surface through the formation of covalent bonds between Ti and C atoms. The photocatalytic activities are evaluated in terms of the efficiencies of photodecomposition and adsorption of methylene blue (MB) in aqueous solution under visible-light irradiation. The as-synthesized TiO2 nanorod-decorated graphene sheets showed unprecedented photodecomposition efficiency compared to the pristine TiO2 nanorods and the commercial TiO2 (P-25, Degussa) under visible-light. It is believed that this predominant photocatalytic activity is due to the synergistic contribution of both a retarded charge recombination rate caused by a high electronic mobility of graphene and an increased surface area originated from nanometer-sized TiO2 nanorods. Furthermore, photoelectrochemical study is performed to give deep insights into the primary roles of graphene that determines the photocatalytic activity. (C) 2011 Elsevier B.V. All rights reserved.
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