Zn掺杂TiO2的制备及其光催化降解甲基橙性能

采用沉淀法制备了不同掺杂量的Zn/TiO₂催化剂，以光催化降解甲基橙为探针反应，考察其光催化活性，并采用紫外漫反射和X射线衍射对其进行结构表征。研究结果表明，Zn的掺杂量对催化剂活性影响较大，最佳掺杂物质的量分数为1.5%；催化剂的紫外漫反射微分曲线的峰值变化与其活性变化一致，1.5%(物质的量分数) Zn/TiO2的微分峰值最大。X射线衍射分析表明，少量Zn高度分散在TiO₂晶格中。Zn掺杂物质的量分数1.5%时，添加2 g·L^-1的Zn/TiO₂催化剂，甲基橙降解的最佳条件：pH＝3，浓度15 mg·L^-1，降解率最高达98.6％。

Zn-doped titania: preparation and behaviors for photocatalytic degradation of methyl orange

Zn/TiO2 catalysts with different amount of Zn were prepared by precipitation method and used in photocatalytic degradation of methyl orange. Structure of the Zn/TiO2 catalysts was characterized by UV-DRS and XRD. The results showed that amount of doping Zn had much influence on degradation of methyl orange, with optimum Zn content of 1.5% （molar fraction） in Zn/TiO2. The changes of DRS dif- ferential coefficient peak values of catalysts were consistent with the changes of their photocatalytic activity, with the maximum differential coefficient peak value occurring at 1.5% （ molar fraction） Zn in Zn/TiO2. XRD results showed that Zn was highly dispersed in the lattice of TiO2. For 1.5% Zn/TiO2 with catalyst dosage of 2 g ·L-1, optimal degradation condition were obtained as follows ： initial pH = 3, initial methyl orange concentration 15 mg·L-1 Methyl orange degradation rate of 98.6% was obtained under the optimal condition.