中文摘要：

采用溶胶-凝胶法制备掺杂ZnO的TiO2复合半导体材料，对其降解制药废水的催化活性进行测定，并用XRD、拉曼光谱分析和TEM对其晶体结构进行表征。实验结果表明：ZnO能显著提升TiO2的催化效率，当ZnO掺杂量8％时光催化活性最大，其COD、色度去除率可分别达72．5％、33．8％。适当掺杂Ce4＋或La3＋可提高ZnO—TiO2的催化活性，但掺杂过量活性会显著降低。La3＋的促进作用强于Ce4＋，掺杂La3＋0．4％时，COD、色度去除率比未掺杂提高17．2％和31．2％，可见稀土掺杂的ZnO—TiO：复合半导体材料具有应用于生产的可行性。

英文摘要：

In this study, the compound semiconductor material of TiO2 doped with ZnO was prepared by sol-gel method, and its photocatalytic degradation activity was determined, as well as its crystal structure was characterized by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The results showed that ZnO could improve the catalytic efficiency of TiO2 significantly. The maximum photocatalytic degradation activity would be got at the doping amount of ZnO of 8% , in that case the removal rate of COD and chroma would be 72.5% and 33.8% , respectively. Doping appropriate amount of Ce4＋ or La3 ＋ could improve the catalytic activity of ZnO-TiO2 , while doping excessive amount would reduce the catalytic activity notably. The enhancing effect of La3＋was better than that of Ce4＋. The optimum doping amount of La3＋ was 0. 4% in case that the removal degree of COD and chroma would be 17.2% and 31.2% higher than that of ZnO-TiO2 without it. It could be seen that the compound semiconductor material of ZnO-TiO2 doped with rare-earth could be used in the production in the future.