具有稳定可见光催化活性TiO_2薄膜的常温制备  

Ambient-temperature Preparation of TiO_2 Films with Stable Visible-light Photocatalytic Activity

作　　者：申乾宏[1] 杨辉[1] 高基伟[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10期1758-1762,共5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：采用溶胶-凝胶法,通过钛酸丁酯水解制备了具有锐钛矿-金红石-板钛矿混晶晶粒的TiO2溶胶。以四磺酸酞菁铜(CuTsPc)为敏化剂,经水浴加热后获得具有可见光响应活性的TiO2溶胶。使用该溶胶浸渍-提拉涂膜,在室温下晾干即可得到酞菁敏化的TiO2薄膜(CuTsPc-TiO2)。对敏化溶胶的制备条件及薄膜的性能进行了考察,并探讨了CuTsPc的负载机理。结果表明:延长水浴时间或提高TiO2溶胶中的CuTsPc浓度有利于增大薄膜中CuTsPc的负载量。随着薄膜中CuTsPc量的增加,薄膜的可见光催化活性增强,但CuTsPc负载过多又会导致薄膜光催化活性降低。CuTsPc通过静电作用在TiO2胶粒表面发生吸附,从而实现在薄膜中均匀、牢固的负载,保证了CuTsPc-TiO2薄膜在循环使用过程中的稳定性。By means of sol-gel method, TiO2 sol containing anatase-rutile-brookite mischcrystal grains was synthesized through the hydrolyzation of butyl titanate. Copper（Ⅱ） phthalocyanine tetrasulfonic acid （CuPcTs） was added into TiO2 sol, and phthalocyanine sensitized TiO2 sol with visible-light response was prepared after heating in the water bath. Sensitized mischcrystal TiO2 film （CuTsPc-TiO2） was obtained from the as-prepared sol by a dipcoating technique at room temperature. The preparation condition of the sensitized sol and the properties of CuTsPc- TiO2 film were investigated, and the loading mechanism of CuTsPc was also discussed. The results show that prolonging the time in water bath or raising the CuPcTs concentration in TiO2 sol are helpful for increasing the amount of CuPcTs supported in the film. The visible-light photocatalytic activity of the film is increased with the amount of CuPcTs, but too much CuPcTs will decrease the photocatalytic activity of the catalyst. CuPcTs can be loaded in the film uniformly and firmly via adsorption on the TiO2 colloidal particles due to electrostatic attraction, and this ensures the stability for repeated use of CuTsPc-TiO2 films.

关 键 词：二氧化钛 混晶 敏化 四磺酸酞菁铜 可见光 光催化 

分 类 号：O643[理学—物理化学]