锐钛矿型多孔TiO_2薄膜的溶解法制备及性能表征  

Preparation and Characterization of Porous Anatase TiO_2 Films by Dissolution Method

作　　者：申乾宏[1] 杨辉[1] 高基伟[1] 宁海水[1] 蔡振钱[1] 

机构地区：[1]浙江大学材料与化学工程学院,杭州310027

出　　处：《无机化学学报》2007年第7期1159-1164,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家科技支撑计划(No.2006BAJ05B05)资助项目;浙江省科技计划(No.2005C24005)资助项目

摘　　要：在具有锐钛矿晶粒的TiO2溶胶中加入苯丙乳液粒子,使用该混合液浸渍提拉涂膜,然后利用甲苯将薄膜中的苯丙乳液粒子溶解去除,并通过重复涂膜,在室温下获得了具有良好多孔性的锐钛矿型TiO2薄膜。考察了多孔薄膜的表面形貌、光学性能、吸附性能和光催化性能。结果表明:随薄膜涂膜次数的增加,TiO2多孔薄膜的吸光度增大,透光率减小,光吸收边波长向长波方向移动。罗丹明B在TiO2多孔薄膜上的吸附量随涂膜次数的增加先升高,后降低;多次涂膜会在薄膜中产生半封闭的孔洞,经过长时间的毛细渗透等作用能进一步增加薄膜对罗丹明B的吸附。TiO2多孔薄膜通过吸附+光催化氧化的模式快速分解罗丹明B,其活性主要受到薄膜在光催化反应初期的吸附能力的影响。此外,TiO2的负载量、光的利用效率、以及光生电荷迁移及其分离等也是影响薄膜光催化活性的因素。The anatase TiO2 films with well porosity were obtained at room temperature by repeated dip-coating the styreneacrylate spheres solution in TiO2 sol containing anatase crystalline grains and removing the styrene-acrylate spheres preferentially by toluene. The surface morphology, optical properties, adsorption performance and photocatalytic activity of the films were investigated. The results show that the absorbance of the porous TiO2 film increases and the transmittance of the porous TiO2 film decreases with the increase of the coating cycles, and the absorption edge shifts toward the long wavelength. The adsorption of rhodamine B on the porous TiO2 film increases at first and then decreases with increasing coating cycles. Meanwhile, the semi-closed pores are formed because of the repeated coating, and thus the adsorption amount of rhodamine B is further increased through the longtime capillary osmosis. Rhodamine B molecule is decomposed rapidly on the porous TiO2 film via the adsorption followed by the photocatalytic oxidation, and the adsorption capacity of the porous TiO2 film at the beginning of the photocatalytic reaction is believed to be the main reason for the photocatalytic activity enhancement of TiO2 film. Furthermore, the photocatalytic activity of the porous TiO2 films is also affected by other factors such as the loading of Ti02 catalyst, the use of light, charge transfer and separation, etc.

关 键 词：二氧化钛薄膜 多孔性 苯丙乳液 室温制备 光催化 

分 类 号：O643[理学—物理化学]