Ag-TiO2光催化剂的制备、性能及机理研究

摘要

采用溶胶-凝胶法制备了Ag-TiO2光催化剂粉体,研究了不同制备条件对样品性能的影响,并以亚甲基蓝(MB)作为目标降解物,研究了其光催化性能,分析了Ag掺杂提高光催化性能的机理.结果表明,Ag离子的掺杂拓展了TiO2在可见光区的光谱响应范围,降低了光生电子和空穴的复合几率；在普通日光灯下,当Ag的掺杂量为n(Ag):n(TiO2) =0.1％,热处理温度为400℃条件下制备的样品催化性能最好,其光催化活性显著高于Degussa P25.%The Ag-TiO2 photocatalysts were prepared by sol-gel method. The influences of different preparation condition on properties were studied. The photocatalytic activity of Ag-TiO2 was investigated by measuring the degradation rate of methylblue(MB) under the irradiation of fluorescent lamp. The results show that Ag doping broadens the absorption region to visible light and inhibits the recombination of the photo-generated electrons and holes. The photocatalytic activity of the sample with n(Ag) : n(TiO2) =0. 1% and sintered temperature at 400℃ is the best under the irradiation of fluorescent light, and it is higher than that of Degussa P25. The mech-anism of Ag doped TiO2 for enhancement of photocatalytic activity is analyzed.