N掺杂的TiO_2纳米管的制备及光催化脱除NO_x性能  

Preparation of N-Doped TiO_2 Nanotubes and their Photocatalytic Activity in Removing NO_x

作　　者：任瑞鹏[1] 冉令锋 吕永康[1] 王红涛[2] 陈丽娟[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,太原030024 [2]太原理工大学环境科学与工程学院,太原030024

出　　处：《太原理工大学学报》2014年第2期220-225,共6页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(51078252);山西省青年基金资助项目(2013021007-5);太原理工大学校基金(900103-03020788)

摘　　要：采用浸渍法对TiO2（水热法合成）纳米管进行N修饰，制得N掺杂的TiO2纳米管。通过XRD、TEM、UV—Vis和DRS对样品进行表征。结果表明，500℃、热处理后的样品晶型几乎全部为锐钛矿；纳米管长为60～160mm，管径为7～15nm，壁厚为1．5nm左右；N掺杂提高了纳米管在可见光区的光吸收能力。催化实验表明：N掺杂增强了TiO2纳米管在紫外光及可见光下的催化活性；当N掺杂量（质量分数）为15％，煅烧温度为500℃，煅烧时间为2h时。催化效果最佳，紫外光及可见光下氮氧化物（NOx）去除率分别为95．73％，93．16％。N--doped TiO2 nanotubes were prepared by impregnation method using hydrotherreally synthesized TiO2 nanotubes as raw material. The nanotubes were characterized by using XRD, TEM, UV-Vis and DRS. The result shows that. the samples were pure anatase when calcinated at 500℃ ; the length of nanotubes was 60-160 nm mainly, the diameter of the tube was 7 -15 nm and the thickness of the wall was about 1.5 nm. Compared with TiO2 nanotubes, the Ndoped TiO2 nanotubes had stronger absorption ability in the visible light region. Photocatalytic property was investigated by the experiment of degradation of NOx. It shows that N doping enhanced the photocatalytic efficiency of TiO2 nanotubes in both UV and visible light regions. In addition, the sample which was mixed with 15% ammonium fluoride and calcined at 500℃ for 2 h showed the best degradation rate of NOx. The degradation rate was 95.73% under ultraviolet light and 93.16% under visible light.

关 键 词：TIO2纳米管 掺杂 光催化 氮氧化物 

分 类 号：O643[理学—物理化学] X7[理学—化学]