金属离子掺杂二氧化钛及水体光催化脱氮研究

doi:10.7517/j.issn.1674-0475.2007.03.165

影像科学与光化学 ›› 2007, Vol. 25 ›› Issue (3): 165-175.DOI: 10.7517/j.issn.1674-0475.2007.03.165

金属离子掺杂二氧化钛及水体光催化脱氮研究

柳丽芬¹, 张扬¹, 杨凤林¹, 余济美²

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, 香港, 沙田

收稿日期:2006-09-28 修回日期:2006-11-27 出版日期:2007-05-23 发布日期:2007-05-23
通讯作者: 柳丽芬,E-mail:yuzhe25521@yahoo.com.cn.
基金资助:
国家自然科学基金(20477006)

Study on Photocatalytic Activity of TiO₂ Photocatalysts Doped with Metal Ions in Nitrogen Removal

LIU Li-fen¹, ZHANG Yang¹, YANG Feng-lin¹, Jimmy C YU²

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

Received:2006-09-28 Revised:2006-11-27 Online:2007-05-23 Published:2007-05-23

摘要/Abstract

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%.

关键词: TiO₂, 光催化, 过渡金属离子掺杂, 水中无机氮去除

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.

Key words: TiO₂, photo-catalysis, transition metal ion doping, nitrogen removal

中图分类号:

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.

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.

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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 TiO₂ Photocatalysts Doped with Metal Ions in Nitrogen Removal

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金属离子掺杂二氧化钛及水体光催化脱氮研究

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Study on Photocatalytic Activity of TiO₂ Photocatalysts Doped with Metal Ions in Nitrogen Removal