Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (12): 3299-3304.doi: 10.3866/PKU.WHXB20101139

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Photocatalytic Degradation of Gas Phase Benzene over WO3/Bi12SiO20

WU Da-Wang1,2, LI Shuo2,3, CHEN Yao-Qiang2, GONG Mao-Chu2, ZHANG Qiu-Lin2, LIU Kang-Lian1, WANG Yu-Lin1   

  1. 1. Department of Chemistry and Chemical Engineering, Qiannan National Normal University, Duyun 558000, Guizhou Province, P. R. China;
    2. Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
    3. Chemical and Biological Institute of Technology, Yantai University, Yantai 264001, Shandong Province, P. R. China
  • Received:2010-06-13 Revised:2010-08-17 Published:2010-12-01
  • Contact: LI Shuo, CHEN Yao-Qiang E-mail:tianshan0991q@yeah.net, chenyaoqiang@scu.edu.cn
  • Supported by:

    The project was supported by the Natural Science Foundation of the Department of Education of Guizhou Province, China (2005221).

Abstract:

WO3 and Bi12SiO20 powders were prepared by a gas-liquid reaction and chemical solution decomposition, respectively. WO3/Bi12SiO20 photocatalysts were coupled by mixing WO3 and Bi12SiO20. The reduction of benzene was used to investigate the activity of WO3/Bi12SiO20. The results indicate that the activity of the coupled WO3/Bi12SiO20 catalysts increased substantially. The degradation behavior of benzene over 30%(w) WO3/Bi12SiO20 under UV irradiation was obviously better than that of P-25, and the degradation of benzene under visible light was also considerable. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The results showed that there was a good synergistic effect between WO3 and Bi12SiO20. The photogenerated electrons and holes were effectively separated after coupling between WO3 and Bi12SiO20 and the rate of electron and hole production increased. The electrons and holes were effectively separated and the photocatalytic activity increased accordingly.

Key words: Coupling, Photocatalysis, Degradation, Gas benzene

MSC2000: 

  • O647