N修饰纳米TiO_2可见光催化降解氮氧化物

摘要为了充分利用可见光催化转化氮氧化物,采用碳酸铵作为N源,用浸渍的方法制备了掺N的纳米TiO2。XRD分析结果表明,修饰和煅烧过程没有改变TiO2的晶型;由X光电子能谱(XPS)可得,N在TiO2晶格中形成N—Ti—O键;催化剂的UV-Vis漫反射光谱显示,N修饰TiO2催化剂的吸收光谱发生了一定程度的红移,在可见光区有一定的吸收。N修饰TiO2催化在蓝光照射下对NO2有一定的转化。合适的N修饰量和煅烧温度对修饰过程非常重要,m[(NH4)2CO3]/m(TiO2)为0.20的混合物在600℃下煅烧1.0 h的催化剂在可见光下转化NO2的活性最高。

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	柳士鑫
	赵林
	谭欣
	张睿

关键词：光催化 N修饰杂TiO2 可见光氮氧化物

Abstract： In order to utilize visible light in photocatalytic conversion of NO_2,nitrogen atoms were doped in commercially available photocatalytic TiO_2 powders using ammonium carbonate as N source by immpregnating method.The crystal structures of TiO_2 was not changed after calcinations process.Analysis by X-ray photoelectron spectroscopy(XPS) indicated that N atoms were incorporated in the bulk phase of TiO_2 as(N-Ti-O) linkages.A significant shift of the absorption edge to a lower energy and a higher absorption in the visible light region were observed.These N-decorated TiO_2 powders exhibited photocatalytic activity for the degradation of NO_2 under visible light irradiation.The sample mixed with 20% ammonium carbonate and calcined at 600 ℃ for 1.0 h showed best photocatalytic activity.

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Received 2008-03-15; published 2008-03-15

引用本文:

柳士鑫;赵林;谭欣;张睿;.N修饰纳米TiO_2可见光催化降解氮氧化物[J]. 化学工业与工程, 2008,25(2): 98-103

LIU Shi-xin~1,ZHAO Lin~1,TAN Xin~1,ZHANG Rui~2.Photocatalytic Degradation of Nitrogen Oxides Using N-Decorated TiO_2 Under Visible Light Irradiation[J]. Chemcial Industry and Engineering, 2008,25(2): 98-103

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