物理化学学报 >> 2010, Vol. 26 >> Issue (01): 79-86.doi: 10.3866/PKU.WHXB20100131

催化和表面结构 上一篇    下一篇

溶胶-凝胶和浸渍-水热制备方法对TiO2/AC光催化剂结构和性能的影响

徐鑫, 王晓静, 胡中华, 刘亚菲, 王晨晨, 赵国华   

  1. 同济大学化学系, 上海 200092; 河北科技大学理学院, 石家庄 500018
  • 收稿日期:2009-07-27 修回日期:2009-09-14 发布日期:2009-12-29
  • 通讯作者: 胡中华 E-mail:huzh@tongji.edu.cn

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

摘要:

分别采用溶胶-凝胶法和浸渍-水热法制得负载于活性炭(AC)的TiO2催化剂, 并用扫描电镜(SEM)、X射线衍射(XRD)、拉曼光谱和氮气吸附等方法对催化剂进行了表征. 结果表明: 溶胶-凝胶法制得的TiO2以不规则碎片形式涂附在载体表面, 而浸渍-水热法制得的球形TiO2颗粒呈柱形生长均匀覆盖在载体表面; 不同温度处理的浸渍-水热法制得的TiO2/AC光催化剂的中孔和微孔比表面积均大于溶胶-凝胶法制得的样品, 负载的TiO2粒径则小于溶胶-凝胶法制得的样品. 对甲基橙(MO)溶液的光催化降解测试结果表明, 600 ℃煅烧为两种方法的最佳热处理温度, 浸渍-水热法制得的催化剂光催化效果明显强于溶胶-凝胶法的.

关键词: TiO2, 光催化, 活性炭载体, 溶胶凝胶法, 浸渍-水热法

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