铋掺杂磁性光催化剂的制备及其光催化活性

Preparation and photocatalytic activity of Bi-doped magnetic TiO_2 photocatalysts

以Fe3O4/SiO2复合微球为基体,采用溶胶—凝胶法制备了Bi掺杂的磁性TiO2复合光催化剂,并用SEM、FT—IR和VSM等测试手段对催化剂进行了表征。以活性艳红K-2BP为目标降解物评价其光催化活性。结果表明,制备的复合光催化剂易于磁性固液分离,K-2BP溶液初始浓度为20 mg/L,pH值为2,光催化剂的添加量为0.5 g/L,Bi摩尔分数为0.6%的光催化剂时的催化活性最高,光催化反应5 h后K-2BP的降解率达到88.38%。

The magnetic TiO2 photocatalyst doped with Bi were prepared by sol-gel process using Fe3O4/SiO2 composite microspheres as supporter.The photocatalyst samples were characterized by SEM,FT-IR and VSM respectively.The photocatalytic activity of the catalyst was evaluated by degradation of reactive brilliant red K-2BP.The results showed that the composite photocatalyst could be separated from the solution easily.The decolorizing rate reached the maximum of 88.38% by illumination after 5 h when the original concentration of K-2BP was 20 mg/L,pH value of solution was 2,additive amount of photocatalyst was 0.5 g/L,and the molar ratio of Bi to TiO2 was 0.6%.