中文摘要：

为提高光催化剂的稳定性,选取硅藻土为载体,以钛酸四异丙酯为前驱物,采用溶胶-凝胶法制备了TiO2/硅藻土光催化剂,并利用XRD、SEM、FT-IR等技术对其进行表征.以蒽醌染料弱酸性艳蓝RAW为目标降解物,考察了TiO2/硅藻土的光催化活性、最佳pH值范围及催化剂重复使用对光催化活性的影响.结果表明,所制备的TiO2为锐钛矿和金红石混晶型,平均粒径11nm,通过控制硅藻土加入量可以得到负载均匀的光催化剂.所制备的TiO2/硅藻土具有较强的光催化活性,对弱酸性艳蓝RAW的降解效果好于商品DegussaP25型TiO2,最佳pH值为4.0.该催化剂性质稳定,重复使用15次后,催化活性仅降低12.4%.

英文摘要：

In order to improve the stability of photocatalyst, TiO2/diatomite was prepared by sol-gel method with titanium（IV） isopropoxide as precursor, which was then characterized by XRD, SEM and FT-IR. The photocatalytic activity of the composite was determined using anthraquinone dye weak acid brilliant blue RAW as model pollutant. Influences of solution pH and the photocatalyst-reused on photocatalytic activity were also investigated. TiO2 coated on the surface of diatomite showed mixed crystal of anatase and rutile with an average particle size of 11 nm. The uniform TiOa coating could be achieved by controlling the amount of added diatomite. The TiO2/diatomite demonstrated strong photocatalytic activity, and the decolorizing rate for weak acid brilliant blue RAW solution was higher than that for the Degussa P25-TiO2. The optimum pH for photocatalytic reaction was 4.0. The TiO2/diatomite also showed strong stability, with its photocatalytic activity reducing only 12.4% after repeated use for 15 times.