Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1985-1991.doi: 10.3866/PKU.WHXB201205161

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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. 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
  • Received:2012-03-19 Revised:2012-05-15 Published:2012-07-10
  • Contact: CUI Yu-Min, WU Xing-Cai E-mail:cymlh@fync.edu.cn; wuxingca@nju.edu.cn
  • Supported by:

    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).

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 words: Deposition method, Sensitized, Anatase, BiOI content, Photocatalysis

MSC2000: 

  • O644