| 金属离子掺杂二氧化钛及水体光催化脱氮研究 |
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| 引用本文： | 柳丽芬,张扬,杨凤林,余济美. 金属离子掺杂二氧化钛及水体光催化脱氮研究[J]. 影像科学与光化学, 2007, 25(3): 165-175. DOI: 10.7517/j.issn.1674-0475.2007.03.165 |
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| 作者姓名： | 柳丽芬 张扬 杨凤林 余济美 |
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| 作者单位： | 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;香港中文大学,化学系,香港,沙田 |
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| 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%.
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| 关 键 词： | TiO2 光催化 过渡金属离子掺杂 水中无机氮去除 |
| 收稿时间： | 2006-09-28 |
Study on Photocatalytic Activity of TiO2 Photocatalysts Doped with Metal Ions in Nitrogen Removal |
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| LIU Li-fen,ZHANG Yang,YANG Feng-lin,Jimmy C YU. Study on Photocatalytic Activity of TiO2 Photocatalysts Doped with Metal Ions in Nitrogen Removal[J]. Imaging Science and Photochemistry, 2007, 25(3): 165-175. DOI: 10.7517/j.issn.1674-0475.2007.03.165 |
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| Authors: | LIU Li-fen ZHANG Yang YANG Feng-lin Jimmy C YU |
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| Affiliation: | 1. Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental and Biological Science, Dalian University of Technology, Dalian 116023, Liaoning, P. R. China;2. Department of Chemistry, The Chinese University of Hong Kong, Shatiin, HKSAR |
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| Abstract: | Titanium dioxide photo-catalysts doped/co-doped with Ce3+,La3+/Ag+/Fe3+ 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 Fe2+ 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. |
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| Keywords: | TiO2 photo-catalysis transition metal ion doping nitrogen removal |
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