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The Scientific World Journal
Volume 2014, Article ID 503895, 7 pages
http://dx.doi.org/10.1155/2014/503895
Research Article

Fabrication of ZnS-Bi-TiO2 Composites and Investigation of Their Sunlight Photocatalytic Performance

1School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China
2School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China

Received 10 December 2013; Accepted 6 January 2014; Published 11 February 2014

Academic Editors: F. Ito, L. Jing, and P. Samartzis

Copyright © 2014 Xuewei Dong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The ZnS-Bi-TiO2 composites were prepared by the sol-gel method and were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-visible diffuse reflectance spectroscopy (UV-Vis DRS). It is found that the doped Bi as Bi4+/Bi3+ species existed in composites, and the introducing of ZnS enhanced further the light absorption ability of TiO2 in visible region and reduced the recombination of photogenerated electrons and holes. As compared to pure TiO2, the ZnS-Bi-TiO2 exhibited enhanced photodegradation efficiency under xenon lamp irradiation, and the kinetic constant of methyl orange removal with ZnS-Bi-Ti-0.005 (0.0141 min−1) was 3.9 times greater than that of pure TiO2 (0.0029 min−1), which could be attributed to the existence of Bi4+/Bi3+ species, the ZnS/TiO2 heterostructure.