采用溶胶-凝胶法合成多孔TiO2-Al2O3复合光催化剂,对其进行XRD、SEM、FT-IR、N2吸附-脱附等表征,考察煅烧时间对光催化剂活性的影响.结果表明,所制备的样品为锐钛矿相TiO2和非晶态Al2O3的复合氧化物,煅烧时间增加使TiO2晶体的粒径有微小增长；样品颗粒表面非常粗糙,具有比较大的比表面积,平均孔径在10～16nm之间；随着煅烧时间的增加,样品的光催化活性和吸附性能呈现先增大后下降的趋势；煅烧时间为3h时,样品的光催化活性和吸附性能最好.采用TiO2-Al2O3复合光催化剂经90 min光照后,甲基橙溶液的降解率达到77.0％,总脱色率可达95.1％.%The porous TiO2-Al2O, composite photocatalyst was prepared by a sol-gel method. The materials were characterized by XRD, SEM, FT-IR, and N2 sorption-desorption methods. Photocatalytic activity of the materials was evaluated as the factor of calcination time. The results showed that increase of calcination time caused slight growing of TiO2 crystallite size. Surface morphologies of the materials were very rough and the materials had large surface area with average pore size in the range between 10 to 16 run. Photocatalytic activity and adsorption capacity of the material increased at first and then dropped afterwards with increasing calcination time and the sample calcinated for 3 h presented the optimal properties. After 90 min of irradiation, photocatalytic degradation of methyl orange on the optimized composite reached 77. 0% and total decoloration rate was 95. 1 %.
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