物理化学学报 >> 2008, Vol. 24 >> Issue (09): 1589-1596.doi: 10.3866/PKU.WHXB20080911

研究论文 上一篇    下一篇

活性炭孔径和比表面积对TiO2/AC光催化性能的影响

陈玉娟; 胡中华; 王晓静; 赵国华; 刘亚菲; 刘巍   

  1. 同济大学化学系, 上海 200092
  • 收稿日期:2008-05-12 修回日期:2008-06-02 发布日期:2008-09-10
  • 通讯作者: 胡中华 E-mail:huzh@mail.tongji.edu.cn

Influence of Pore Size and Surface Area of Activated Carbon on the Performance of TiO2/AC Photocatalyst

CHEN Yu-Juan; HU Zhong-Hua; WANG Xiao-Jing; ZHAO Guo-Hua; LIU Ya-Fei; LIU Wei   

  1. Department of Chemistry, Tongji University, Shanghai 200092, P. R. China
  • Received:2008-05-12 Revised:2008-06-02 Published:2008-09-10
  • Contact: HU Zhong-Hua E-mail:huzh@mail.tongji.edu.cn

摘要: 采用“同步物理-化学活化法”二次活化商品活性炭, 制备不同孔径和比表面积的系列活性炭(AC)载体, 以偏钛酸为钛源, 利用均匀沉淀法制备TiO2负载型光催化剂(TiO2/AC), 用氮吸附、XRD、SEM等方法表征, 研究活性炭的孔径和比表面积对TiO2/AC性能的影响; 并通过降解水溶液中的亚甲基蓝(MB)研究TiO2/AC光催化氧化特性, 考察催化剂投加量、不同MB浓度等因素对光催化氧化的影响. 结果表明, 负载的TiO2粒子粒径为12-20 nm, 活性炭的比表面积大、平均孔径大有利于TiO2的均匀分散, 阻止TiO2晶粒生长, 有利于充分发挥TiO2小尺度效应; 另外, 活性炭吸附和TiO2光解的协同效应使TiO2/AC光催化剂对MB降解的效率显著提高. 动力学研究表明, TiO2/AC光催化降解MB反应符合表观一级动力学特征.

关键词: 负载型TiO2, 活性炭载体, 孔径, 光催化剂, 亚甲基蓝

Abstract: Commercial activated carbon (AC) was post-activated by means of simultaneous physical-chemical activation in order to produce porous carbon supports with different pore sizes and surface areas. Photocatalysts of AC-supported TiO2 were prepared by well-dispersed deposition using inorganic species of H2TiO3 as Ti source. Nitrogen adsorption, XRD, and SEM were used to characterize ACs and TiO2/ACs and to investigate the influence of AC surface area and pore size on the resultant catalysts. The photocatalytic performance of TiO2/AC catalysts was studied by degradation of methylene blue (MB) in aqueous solution. The influence of catalyst dosage and MB concentration on the degradation was investigated. The results showed that nano-TiO2 deposit was formed in the particle size of 12-20 nm. The larger the AC surface area and average pore size, the smaller the TiO2 particle formed on the carbon surface. It was found that TiO2/AC catalysts had a synergetic effect of AC adsorption and TiO2 photocatalysis on the degradation of MB, so that the efficiency increased significantly. The kinetics of MB degradation by TiO2/AC was of apparent first order reaction mechanism.

Key words: Supported TiO2, Activated carbon support, Pore size, Photocatalyst, Methylene blue

MSC2000: 

  • O644