Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 243, Issue -, Pages 169-178Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2012.10.017
Keywords
AgBr-TiO2; Nanoheterostructure; Microemulsion-like chemical precipitation; Photogenerated charge transfer; Photocatalysis
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Funding
- National Nature Science Foundation of China [21071048]
- Chang Jiang Scholar Candidates Programme for Provincial Universities in Heilongjiang [2012CJHB003]
- Science Foundation of Harbin City of China [2011RFXXG001]
- Program for Innovative Research Team in Heilongjiang University [Hdtd2010-02]
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A simple microemulsion-like chemical precipitation method has been successfully developed to construct effectively-contacted AgBr-TiO2 composite. The key of this method is the dual roles of Br- in the synthetic process, as linkers between cetyltrimethyl ammonium cation surfactants and nanocrystalline anatase TiO2 in the acidic condition, and as bromine sources to directly produce nanocrystalline AgBr on the surfaces of TiO2 by chemical precipitation. It is well demonstrated that the as-constructed AgBr-TiO2 nanoheterostructured composites display effective photogenerated charge transfer between AgBr and TiO2, favorable to improve charge separation, by means of the surface photovoltage technique in different atmospheres at the aid of outer electric fields, especially for the transient surface photovoltage technique in air. And also, the Br- in crystal lattice of AgBr could effectively capture photogenerated holes under illumination. These factors are well responsible for the enhanced activity for photocatalytic degradation of liquid phase aqueous phenol solution and gas phase acetaldehyde under either UV-visible or visible irradiation, and the stability of AgBr in the photocatalytic processes. (C) 2012 Published by Elsevier B.V.
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