%0 Journal Article
%T Visible-light Photocataltic Activity of Cr-doped TiO2 Nanoparticles Synthesized by Flame Spray Pyrolysis
%A TIAN Bao-Zhu
%A LI Chun-Zhong
%A GU Feng
%A JIANG Hai-Bo
%A HU Yan-Jie
%J 无机材料学报
%D 2009
%I Science Press
%R 10.3724/sp.j.1077.2009.00661
%X Cr-doped TiO2 nanoparticles were synthesized by one-step flame spray pyrolysis technique. The effects of Cr3+ doping on the microstructure, light absorption property, and photocatalytic activity of the samples were investigated. It is found that increasing Cr3+ concentration restrains the formation of anatase and simultaneously favors the formation of rutile. At low concentration (  %), Cr is mainly incorporated into the crystal lattice of TiO2 in the form of Cr3+, while high Cr concentration promotes the formation of Cr2O3 clusters. The result of photocatalytic degradation of 2,4-dichlorophenol demonstrates that appropriate Cr3+ doping can evidently enhance the visible-light photocatalytic activity of TiO2. The optimal Cr3+ concentration to obtain the highest photocatalytic activity is 1at%. The improvement of visible-light photocatalytic activity derived from Cr doping is mainly related to the enhancement of visible light absorption, appropriate crystalline composition, and improved transfer efficiency of photogenerated electrons and holes.
%K flame spray pyrolysis
%K titanium dioxide
%K Cr doping
%K photocatalytic activity
%U http://www.jim.org.cn/fileup/PDF/20090403.pdf