Ag/TiO_2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/TiO_2 and Photocatalysis

作　　者：柳丽芬[1] 李秀婷[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工业生态与环境工程教育部重点实验室 [2]香港中文大学化学系

出　　处：《感光科学与光化学》2006年第4期291-300,共10页Photographic Science and Photochemistry

基　　金：国家自然科学基金(20477006)

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%.Highly active Ag/TiO2 photoeatalyst was prepared using a photocatalytie 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 Fe^2＋ on the activity of photoeatalyst 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 photoeatalyst preparation, the photoeatalyst activity was enhanced under protection of nitrogen and addition of Fe^2＋ increased photocatalytie reduction of nitrite. 2 h photoeatalytie reaction reduced the total nitrogen by 63.9 % for water samples with both ammonia and nitrite.

关 键 词：AG/TIO2 光催化反应 氨氮 亚硝酸氮 

分 类 号：O644.1[理学—物理化学] X703.1[理学—化学]