N-doped SiO2/TiO2 mesoporous nanoparticles with enhanced photocatalytic activity under visible-light irradiation

被引：155

作者：

Hou, Y. D. ^{[1
]}

Wang, X. C. ^{[1
]}

Wu, L. ^{[1
]}

Chen, X. F. ^{[1
]}

Ding, Z. X. ^{[1
]}

Wang, X. X. ^{[1
]}

Fu, X. Z. ^{[1
]}

机构：

[1] Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Breeding Base Photocatalysis, Fuzhou 350002, Peoples R China

来源：

CHEMOSPHERE | 2008年 / 72卷 / 03期

基金：

中国国家自然科学基金;

关键词：

photocatalysis; N-doping; titania; silica; visible light;

D O I：

10.1016/j.chemosphere.2008.02.035

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Mesoporous nanocrystalline N-doped SiO2/TiO2 visible-light photocatalysts were prepared by treating SiO2/TiO2 xerogels in a flow of nitrogen gas bubbled through concentrated ammonia solution. Structural characterization and performance analysis results revealed that the addition Of SiO2 remarkably altered the phase composition, specific surface area, microstructure, as well as the photocatalytic activity of N-doped TiO2. The presence of SiO2 in N-doped TiO2 particles suppressed the formation of rutile phase and the crystal growth of N-doped TiO2 particles during thermal calcinations. When weight ratio of SiO2/TiO2 was in 0.05-0.20, the N-doped SiO2/TiO2 exhibited higher photocatalytic activity than the N-doped TiO2, and optimum ratio was found to be 0.05. The enhanced photocatalytic activity could be attributed to the higher specific area, larger pore volume, and more surface hydroxyl groups in the catalyst. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：414 / 421

页数：8

共 40 条

[1] Improved photocatalytic activity and characterization of mixed TiO2/SiO2 and TiO2/Al2O3 materials [J].