Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (01): 79-86.doi: 10.3866/PKU.WHXB20100131

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Influence of Sol-Gel and Dip-Hydrothermal Preparation Methods on Structure and Performance of TiO2/AC Photocatalysts

XU Xin, WANG Xiao-Jing, HU Zhong-Hua, LIU Ya-Fei, WANG Chen-Chen, ZHAO Guo-Hua   

  1. Department of Chemistry, Tongji University, Shanghai 200092, P. R. China; School of Sciences, Hebei University of Science and Technology, Shijiazhuang 500018, P. R. China
  • Received:2009-07-27 Revised:2009-09-14 Published:2009-12-29
  • Contact: HU Zhong-Hua E-mail:huzh@tongji.edu.cn

Abstract:

TiO2 catalysts deposited on activated carbon (TiO2/AC) were prepared by sol-gel and dip-hydrothermal methods to investigate the effect of preparation methods on the structure and catalytic performance of TiO2/AC catalysts. The samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and nitrogen adsorption. Results show that the TiO2 produced by the sol-gel method consists of irregular fragments coated onto the carbon surface and that the dip-hydrothermal method leads to nanorods being deposited onto the AC surface. The mesoporous and microporous specific surface areas of the TiO2/AC samples prepared by the dip-hydrothermal method were larger than those of the sol-gel samples, and the diameters of the TiO2 particles prepared by the former method were smaller. The performance of the TiO2/AC composite photocatalysts was evaluated by the degradation of methyl orange (MO). We found that 600 ℃ was the optimal temperature for the calcination of TiO2. Furthermore, the photocatalytic activities of TiO2/AC samples prepared by the dip-hydrothermal method were obviously better than those prepared by the sol-gel method.

Key words: TiO2, Photocatalysis, Activated carbon support, Sol-gel method, Dip-hydrothermal method

MSC2000: 

  • O641