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International Journal of Photoenergy
Volume 2008, Article ID 563949, 7 pages
http://dx.doi.org/10.1155/2008/563949
Research Article

Hydrothermal Preparation of Visible-Light-Driven N-Br-Codoped Photocatalysts

1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Received 25 July 2007; Revised 14 November 2007; Accepted 20 January 2008

Academic Editor: Leonardo Palmisano

Copyright © 2008 Yonggang Sheng 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

Using a facile hydrothermal method, N-Br-codoped photocatalyst that had intense absorption in visible region was prepared at low temperature ( ), through a direct reaction between nanocrystalline anatase solution and cetyltrimethylammonium bromide (CTAB). The results of X-ray photoelectron spectroscopy (XPS) showed the existence of N-Ti-N, O-Ti-N-R, (attribute to the doped Br atoms by charge compensation), and species, indicating the successful codoping of N and Br atoms, which were substituted for lattice oxygen without any influence on the crystalline phase of . In contrast to the N-doped sample, the N-Br-codoped photocatalyst could more readily photodegrade methylene blue (MB) under visible-light irradiation. The visible-light catalytic activity of thus-prepared photocatalyst resulted from the synergetic effect of the doped nitrogen and bromine, which not only gave high absorbance in the visible-light range, but also reduced electron-hole recombination rate.