Ag/TiO2光催化氧化还原反应脱除水体中无机氮

doi:10.7517/j.issn.1674-0475.2006.04.291

影像科学与光化学 ›› 2006, Vol. 24 ›› Issue (4): 291-300.DOI: 10.7517/j.issn.1674-0475.2006.04.291

Ag/TiO₂光催化氧化还原反应脱除水体中无机氮

柳丽芬^1,2, 李秀婷¹, 杨凤林¹, 余济美³

1. 大连理工大学, 环境与生命学院, 工业生态与环境工程教育部重点实验室, 辽宁, 大连, 116023;
2. 大连理工大学, 纳米材料科学研究中心, 辽宁, 大连, 116023;
3. 香港中文大学, 化学系, 香港, 沙田

收稿日期:2006-04-03 修回日期:2006-04-25 出版日期:2006-07-23 发布日期:2006-07-23
通讯作者: 柳丽芬(1965-), 女, 博士, 副教授, 从事光催化领域的研究.
基金资助:
国家自然科学基金(20477006).

Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO₂ and Photocatalysis

LIU Li-fen^1,2, LI Xiu-ting¹, YANG Feng-lin¹, Jimmy C Yu³

1. Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science, Dalian University of Technology, Dalian 116023, Liaoning, P.R. China;
2. Center for Nanomaterial and Science, Dalian University of Technology, Dalian 116023, Liaoning, P.R. China;
3. Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong

Received:2006-04-03 Revised:2006-04-25 Online:2006-07-23 Published:2006-07-23

摘要/Abstract

摘要： 采用光催化还原法制备了高活性的载银二氧化钛光催化剂,并用XRF、TEM、XRD及XPS、UV-Vis方法对催化剂进行了表征.考察了负载Ag的含量、催化剂制备时间、搅拌气体的种类以及Fe²⁺的添加等条件对该催化剂光催化水体脱氮活性的影响.结果表明:载银量1.0%时去除效果最佳;制备催化剂时光照时间不充分会使催化剂失去还原效力;氮气保护下催化剂反应活性更高;Fe²⁺的加入利于光催化反应;2 h光催化含氨氮和亚硝基氮的水样,总脱氮率达到了63.9%.

关键词: Ag/TiO₂, 光催化反应, 氨氮, 亚硝酸氮

Abstract: Highly active Ag/TiO₂ photocatalyst was prepared using a photocatalytic reduction method and was characterized with XRF,TEM and XRD,XPS and UV-Vis.Effects of conditional factors such as Ag doping,photo-reduction time,stirring gas and addition of Fe²⁺ on the activity of photocatalyst in nitrogen removal from water by coupled ammonia oxidation and nitrite reduction were investigated.Results showed that nitrite reduction rate and the nitrogen removal rate were highest with 1.0% Ag doping.Also,reduction was ineffective without sufficient irradiation during photocatalyst preparation,the photocatalyst activity was enhanced under protection of nitrogen and addition of Fe²⁺ increased photocatalytic reduction of nitrite.2 h photocatalytic reaction reduced the total nitrogen by 63.9% for water samples with both ammonia and nitrite.

Key words: Ag/TiO₂, photocatalysis, ammonia, nitrite

中图分类号:

柳丽芬, 李秀婷, 杨凤林, 余济美. Ag/TiO₂光催化氧化还原反应脱除水体中无机氮[J]. 影像科学与光化学, 2006, 24(4): 291-300.

LIU Li-fen, LI Xiu-ting, YANG Feng-lin, Jimmy C Yu. Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO₂ and Photocatalysis[J]. Imaging Science and Photochemistry, 2006, 24(4): 291-300.

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Ag/TiO₂光催化氧化还原反应脱除水体中无机氮

Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO₂ and Photocatalysis

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