中文摘要：

采用溶胶-凝胶法制备了掺杂Ce^3＋、La^3＋、Ag^＋、Fe^3＋的TiO2光催化剂，以考察其薄膜和粉体形式对水中无机氮的光催化去除效果和活性．用所制备的催化剂对含氨氮-亚硝酸氮的混合液进行了光催化脱氮研究．本文利用UV—Vis吸收光谱、XRD和TEM对催化剂进行了表征．同时，对影响TiO2光催化效率的因素：如掺杂金属离子的种类、浓度、涂膜层数、反应液中有无Fe^2＋、不锈钢和玻璃载体、反应器的构型等进行了探讨，并对今后的研究进行展望．经过2h紫外光照射反应，实验最佳脱氮效果：金属离子掺杂TiO2薄膜型催化剂总氮去除率在30％左右，金属离子掺杂粉末型催化剂光催化最高总氮去除率可达41．7％．

英文摘要：

Titanium dioxide photo-catalysts doped/co-doped with Ce^3＋ , La^3＋/Ag^＋/Fe^3＋ by using the sol-gel method were prepared and tested to evaluate their photo-catalytic activities on nitrogen removal from solution which contained ammonium and nitrite. The catalysts were characterized using UV-Vis, XRD and TEM. Also investigated were the influencing factors such as different kinds and concentration of doped metal ion, dipping times（thickness of catalyst films）, addition of Fe^2＋ to the solution, different substrate （glass or stainless steel net）, different designs of reactor and different light sources （UV or solar light） on photocatalytic N removal efficiency. After 2 hours UV irradiation, simultaneous removal of ammonium and nitrite could be achieved. The removal efficiency for TN was about 30% when TiO2 film was used. A higher removal rate of 41.7% could be achieved by using TiO2 powders.