文献类型：期刊文献

英文题名：Preparation of homogeneous nitrogen-doped mesoporous TiO2 spheres with enhanced visible-light photocatalysis

作者：Li, Xiao[1,2];Liu, Pengwei[1,2];Mao, Yu[1,2];Xing, Mingyang[1,2];Zhang, Jinlong[1,2,3]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

年份：2015

卷号：164

起止页码：352

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20144300123954);WOS:【SCI-EXPANDED(收录号:WOS:000345181800040)】；

基金：This work has been supported by the National Nature Science Foundation of China (21173077, 21377038, 21203062 and 21237003); the National Basic Research Program of China (973 Program, 2013CB632403), Science and Technology Commission of Shanghai Municipality (12230705000, 12XD1402200); the Research Fund for the Doctoral Program of Higher Education (20120074130001) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Titanium dioxide sphere; Homogeneous; Nitrogen-doped; Mesoporous; Photocatalysis

摘要：A series of mesoporous TiO2 spheres of nanosized crystals with high monodispersity and dimensional homogeneity are synthesized by a simple reflux method. In order to improve the visible light response and to further narrow the band bap of TiO2 sphere, nitrogen is used as the dopant in ahydrothermal method. Different from the traditional nitrogen doping in TiO2 solid sphere, the nitrogen is uniformly distributed from bulk to the surface of mesoporous TiO2 sphere, which is beneficial to the generation of the successive energy bands inside the TiO2 band gap. Interestingly, the XPS results indicate that the nitrogen doping concentration could reach 1.31% (only 0.17% for nitrogen doped solid TiO2 sphere), owing to the homogeneous doping in the mesoporous TiO2 spheres. The nitrogen doped TiO2 spheres exhibit such excellent characteristics as high specific area, relatively small particle size, pure anatase phase and excellent UV-vis absorption capacity in the range of 400-800 nm, which are all beneficial to the photodegradation of Rhodamine B under the visible light irradiation. The high photocatalytic activity could be ascribed to the homogeneous nitrogen doping on the deep adjustment of energy band of TiO2 sphere from the bulk to the surface. (C) 2014 Elsevier B.V. All rights reserved.