TiO2-SiO2二维大孔薄膜的制备及其光催化活性研究

本文采用改进的溶胶-凝胶法制备了具有锐钛矿晶型结构和较小晶粒尺寸的TiO₂-SiO₂溶胶,并以聚苯乙烯(PS)小球为模板,采用旋涂法制备了新型大孔TiO₂-SiO₂复合薄膜,探究了煅烧温度、不同硅钛比以及溶胶添加量对所制备的大孔薄膜形貌及光催化活性的影响,并考察了该薄膜真空活化前后(Ti³⁺掺杂后)在紫外及模拟太阳光下光催化降解有机污染物罗丹明B的活性。通过Raman、DRS、SEM、EPR等方法对薄膜进行表征,发现制备的复合薄膜具有高透明度、良好附着力及优异的光催化活性。

Preparation and Photocatalytic Study of TiO2-SiO2 Macroporous Film

In this work, the TiO₂-SiO₂ sol was prepared by a modified sol-gel method, which exhibited the anatase and small crystal size. And then the macroporous TiO₂-SiO₂ film was synthesized by using polystyrene spheres as the template and TiO₂-SiO₂ sol as the precursor, via the spinning-coating combined with calcination technology. We investigated the impact of calcination temperature, Ti/Si ratio and concentration of sol on the microstructure and photocatalytic activity of macroporous TiO₂-SiO₂ film. We also studied the UV/solar light photcoatalytic activity for the degradation of rhodamin B over the composite film after a vacuum activation treatment. The RAMAN,DRS,SEM,EPR, and other characterizations were used to study a serials of TiO₂-SiO₂ films, as a result, the as-prepared film showed a good transparent property, excellent adhesion and photcatalytic activity.