低温下溶胶凝胶法制备TiO_2纳米晶(英文)  

Preparation of Nanocrystalline TiO_2 by Sol-Gel-Method at Room Temperature

作　　者：陈志君[1] 赵高凌[1] 李红[1] 张俊娟[1] 宋斌[2] 韩高荣[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,材料科学与工程系,杭州310027 [2]浙江大学理学院物理系,杭州310027

出　　处：《无机化学学报》2010年第5期860-866,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50672086);浙江省科研厅项目(No.Y200909120)资助~~

摘　　要：从含过量水的溶胶出发,在室温下得到了TiO2纳米晶。通过红外光谱,透射电子显微镜法和X射线粉末衍射法对含有过量水的溶胶体系中TiO2纳米晶的室温形成机理进行了研究。与传统的溶胶凝胶法相比,在改良的溶胶凝胶体系中,在缩聚反应之前由于水过量使得钛的先驱体快速且充分的水解,从而生成[TiO6]基团,随之形成TiO2纳米晶。晶粒的尺寸为约3.5nm,该法得到的TiO2纳米晶比传统溶胶凝胶法得到的TiO2纳米晶和商用光催化剂德固赛P25具有更好的光催化活性。Nanocrystalline titania（TiO2） particles were obtained at room temperature by a modified sol-gel method starting from a solution with large amount of water. The nanocrystalline TiO2 particles prepared with large amount of water at room temperature were characterized by IR, TEM and XRD. Comparing with conventional sol-gel method, the present system offers quick and complete hydrolysis of titanium precursor before polycondensation, thus resulting in [TiO6] units, and the formation of nanocrystalline TiO2 particles with an average grain size of 3.5 nm. Moreover, the as-prepared nanocrystalline TiO2 powders exhibit a better photocatalytic activity than both of the powders prepared by conventional sol-gel method and the commercial photocatalyst Degussa P25.

关 键 词：TIO2纳米晶 改良的溶胶凝胶体系 机理 光催化活性 

分 类 号：O614.411[理学—无机化学]