WO3-TiO2薄膜型复合光催化剂的制备和性能

 采用溶胶－凝胶法在多孔钛片上制备了WO3－TiO2薄膜型复合光催化剂，并用甲基橙的光催化降解反应对所得薄膜型催化剂的活性进行了评价．实验结果表明：x（W）＝0．5％，涂覆层数为3层，在500℃焙烧1h的WO3－TiO2薄膜型光催化剂的活性最高，比纯TiO2薄膜高出96．7％．此时多孔钛片上负载的TiO2以锐钛矿和金红石两种晶形存在，表明适量W的掺入可使TiO2的相转变温度显著降低．

Preparation and Properties of WO3-TiO2 Composite Film Photocatalyst

WO3-TiO2 composite film phot ocatalyst was prepared on poroustitanium plate by sol-gel method. The photo catalytic activity of the catalyst was investigated for photocatalytic degradation of methyl orange. It was found that the photocatalytic activity of WO3-TiO2 film photocatalyst with x(WO3)=0.5% and 3 coating layers, calcined at 500 ℃ for 1h, is higher than that of pure TiO2 film. Under the experimental conditio ns, TiO2 on porous titanium plate is composed of anatase phase and rutile phase, indicating that the appropriate tungsten doping can effectively decrease the temperature of phase transform from anatase to rutile.