N修饰纳米TiO_2可见光催化降解氮氧化物  

Photocatalytic Degradation of Nitrogen Oxides Using N-Decorated TiO_2 Under Visible Light Irradiation

作　　者：柳士鑫[1] 赵林[1] 谭欣[1] 张睿[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学环境学院,天津300072

出　　处：《化学工业与工程》2008年第2期98-103,共6页Chemical Industry and Engineering

基　　金：国家自然科学基金资助项目(20276053)

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。In order to utilize visible light in photocatalytic conversion of NO2 , nitrogen atoms were doped in commercially available photocatalytic TiO2 powders using ammonium carbonate as N source by immpregnating method. The crystal structures of TiO2 was not changed after calcinations process. Analysis by X-ray photoelectron spectroscopy （XPS） indicated that N atoms were incorporated in the bulk phase of TiO2 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 TiO2 powders exhibited photocatalytic activity for the degradation of NO2 under visible light irradiation. The sample mixed with 20% ammonium carbonate and calcined at 600℃ for 1.0 h showed best photocatalytic activity.

关 键 词：光催化 N修饰杂TiO2 可见光 氮氧化物 

分 类 号：X703.1[环境科学与工程—环境工程]