金属离子掺杂二氧化钛及水体光催化脱氮研究  

Study on Photocatalytic Activity of TiO_2 Photocatalysts Doped with Metal Ions in Nitrogen Removal

作　　者：柳丽芬[1] 张扬[1] 杨凤林[1] 余济美[2] 

机构地区：[1]大连理工大学环境与生命学院国家教育部工业生态与环境工程重点实验室,辽宁大连116023 [2]香港中文大学化学系

出　　处：《感光科学与光化学》2007年第3期165-175,共11页Photographic Science and Photochemistry

基　　金：国家自然科学基金(20477006)

摘　　要：采用溶胶-凝胶法制备了掺杂Ce3+、La3+、Ag+、Fe3+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Fe2+、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2 h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%.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.

关 键 词：TIO2 光催化 过渡金属离子掺杂 水中无机氮去除 

分 类 号：X703[环境科学与工程—环境工程]