非钛醇盐溶胶-凝胶法制备高光活性纳米晶TiO_2气凝胶(英文)  

A Highly Photoactive Nanocrystalline TiO_2 Aerogel Prepared by a Non-Alkoxide Sol-Gel Method

作　　者：陈麟[1] 朱建[1] 杨俊[1] 刘永梅[1] 曹勇[1] 贺鹤勇[1] 戴维林[1] 范康年[1] 

机构地区：[1]复旦大学化学系上海市分子催化与功能材料重点实验室,上海200433

出　　处：《催化学报》2006年第4期291-293,共3页

基　　金：Supported by the National Natural Science Foundation of China(G20503005,20473021,20421303),the National Basic Research Programof China(2003CB615807)and the Research Fund for the Doctoral Programof Higher Education(20050246071).

摘　　要：以TiCl4为前驱体,采用环氧丙烷快速成胶法合成了具有高光催化活性的纳米晶TiO2气凝胶,利用X射线衍射、N2物理吸附和透射电镜等手段考察了H2O/TiCl4摩尔比和热处理等制备参数对TiO2气凝胶织构性质的影响,并以苯酚的光催化降解为模型反应评价了样品的光催化活性.结果表明,H2O/TiCl4摩尔比为3时体系的成胶过程较为缓慢,制备的纳米晶TiO2气凝胶样品具有最小的晶粒尺寸及最大的比表面积和孔容,并且具有最佳的光催化活性.The nanocrystalline TiO2 aerogel was prepared by a novel epoxide-mediated non-alkoxide sol-gel method, and the catalyst was characterized by X-ray diffraction, N2 adsorption and transmission electron microscopy. The influence of the preparation conditions on the textural properties of the TiO2 aerogels was investigated, and the catalyst activity was tested by using phenol degradation as the model reaction. When H2O/TiCl4 molar ratio is 3, the prepared TiO2 aerogel has the smallest crystallite size and the biggest surface area, and the catalyst shows the highest activity for phenol degradation.

关 键 词：二氧化钛 气凝胶 苯酚 降解 环氧丙烷 溶胶-凝胶 

分 类 号：O643.32[理学—物理化学]