溶胶-凝胶和浸渍-水热制备方法对TiO_2/AC光催化剂结构和性能的影响  

Influence of Sol-Gel and Dip-Hydrothermal Preparation Methods on Structure and Performance of TiO_2/AC Photocatalysts

作　　者：徐鑫[1] 王晓静[1,2] 胡中华[1] 刘亚菲[1] 王晨晨[1] 赵国华[1] 

机构地区：[1]同济大学化学系,上海200092 [2]河北科技大学理学院,石家庄500018

出　　处：《物理化学学报》2010年第1期79-86,共8页Acta Physico-Chimica Sinica

基　　金：国家高技术研究发展计划(863)项目(2008AA06Z329)资助~~

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.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.

关 键 词：TIO2 光催化 活性炭载体 溶胶凝胶法 浸渍-水热法 

分 类 号：O643.36[理学—物理化学]