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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (08): 1985-1991    DOI: 10.3866/PKU.WHXB201205161
CATALYSIS AND SURFACE SCIENCE     
Structure and Properties of BiOI/TiO2 (A) Photocatalysts with Different Bi/Ti Molar Ratios
LI Hui-Quan1,2, CUI Yu-Min1,2, WU Xing-Cai3, HUA Lin4, HONG Wen-Shan1
1. School of Chemistry and Chemical Engineering, Fuyang Normal College, Fuyang, 236041, Anhui Province, P. R. China;
2. Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, P. R. China;
3. The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. China;
4. R&D center, Singapore Linovus Technology Pte Ltd, 059818, Singapore
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Abstract  

BiOI-sensitized nano-anatase (TiO2 (A)) photocatalysts were prepared by a deposition method at room temperature, and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL), and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The photocatalytic activities were evaluated by photo-degradation experiments of rhodamine B. With increasing BiOI content, the absorption intensity of BiOI/TiO2 (A) increases in the 370-630 nm region and the absorption band edge redshifts. The UV and visible light photocatalytic activities increase, reaching a maximum when the Bi/Ti molar ratio is 1.7% . The 1.7% BiOI/TiO2 (A) catalyst exhibits much higher visible-light photoactivity than P25, and its UV-light photoactivity is slightly higher than that of P25. The UV and visible light photocatalytic activities of BiOI/TiO2 (A) with similar BiOI content are lower than those of BiOI/P25 catalysts. Compared with TiO2 (A), 1.7% BiOI/TiO2 (A) shows higher UV and visible light photoactivities. This is attributed to the strong absorption in the 370-630 nm region, the redshift of the absorption band edge, and the effective transfer of the photogenerated electrons and holes, which reduces the recombination of electron-hole pairs.



Key wordsDeposition method      Sensitized      Anatase      BiOI content      Photocatalysis     
Received: 19 March 2012      Published: 16 May 2012
MSC2000:  O644  
Fund:  

The project was support by the National Science Foundation of China (21171091) and Natural Science Foundation of Higher Education Institutions in Anhui Province, China (KJ2012A217, KJ2012B136).

Corresponding Authors: CUI Yu-Min, WU Xing-Cai     E-mail: cymlh@fync.edu.cn; wuxingca@nju.edu.cn
Cite this article:

LI Hui-Quan, CUI Yu-Min, WU Xing-Cai, HUA Lin, HONG Wen-Shan. Structure and Properties of BiOI/TiO2 (A) Photocatalysts with Different Bi/Ti Molar Ratios. Acta Phys. Chim. Sin., 2012, 28(08): 1985-1991.

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http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201205161     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I08/1985

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