TiO2/SiO2的制备及其对染料X-3B溶液降解的光催化活性

 以粗孔球形硅胶为载体，以聚乙二醇和二乙醇单乙醚的钛酸四丁酯无水乙醇溶液为浸涂液，用涂覆法制备了TiO2／SiO2光催化剂．用XRD，SEM和UV－Vis等对催化剂的物相、形貌及TiO2负载量进行了表征，并通过可溶性染料活性艳红X－3B的降解反应，考察了其光催化活性．实验结果表明，当选用16．79％TiO2／SiO2光催化剂时，活性艳红X－3B溶液的脱色率可达93％以上．

Preparation of TiO2/SiO2 and Its Photocatalytic Activity for Degradation o f Dye X-3B in Aqueous Solution

TiO2/SiO2 thin film was prepa red by repeating the followingprocedure， first dipping porous round silica gel in Ti-solution of tetrabutyl titanium ethanol containing polyethylene glycol a nd diethylene glycol monoethylether, then calcinating at 600 ℃ for 2 h. The cry stal phase, the morphology, and the TiO2 amount on the beads were determined b y XRD, SEM, and UV-Vis, respectively. The photocatalytic activity of TiO2/SiO2 th in film with different TiO2 loadings was evaluated by degradation of dye X-3 B in aqueous solution. In comparison of TiO2/SiO2 containing w(TiO2)= 54.02% with that containing w(TiO2)=16.79%, the former has larger ave rage particle diameter and had undergone some phase transformation from anatase to r util e, but no phase transformation had been observed for the latter. Furthermore, wi th 16.79%-TiO2/SiO2 as a catalyst, the degradation of dye X-3B in aqueous solution with O2 flow had a decolorization ratio up to 93% in 1h.