以纳米带钛酸为二氧化钛的来源,通过离子交换-煅烧的方法制得了系列AgX(X=Cl,Br,I)/TiO2复合纳米材料。紫外可见吸收光谱表明,AgX/TiO2纳米复合材料在可见光400~470 nm范围内都有很好的吸收。以甲基橙(MO)的可见光降解为探针反应,结果表明:AgBr/TiO2与其他催化剂相比具有较高的光催化活性,在6 min内MO的降解率达到了80%。催化活性高的主要原因是AgBr与TiO2有更好的能带匹配,在光照下电子更易于转移到TiO2的导带上,减少了电子-空穴的复合。 A series of AgX (X = Cl, Br, I) / TiO2 composite nanomaterials were prepared by ion exchange-calcination method using titanic acid as the source of titania. UV-visible absorption spectra show that the AgX / TiO2 nanocomposites have good absorption in the visible range of 400-470 nm. The results showed that the photocatalytic activity of AgBr / TiO2 was higher than that of other catalysts, and the degradation rate of MO reached 80% within 6 min. The main reason for the high catalytic activity is that AgBr has a better band match with TiO2, and electrons are more easily transferred to the conduction band of TiO2 under light irradiation, reducing electron-hole recombination.