Effect of hydroxyl groups on hydrophilic and photocatalytic activities of rare earth doped titanium dioxide thin films

作     者：杜军 吴其 钟汕 顾馨 刘娇 郭海志 张文龙 彭海龙 邹建国 DU Jun ?;WU Qi;ZHONG Shan;GU Xin;LIU Jiao;GUO Haizhi;ZHANG Wenlong;PENG Hailong;ZOU Jianguo

作者机构：Key Lab of Poyang Lake Ecology and Bio-resource Utilization (Ministry of Education) Department of Chemical Engineering College of Environmental and Chemical Engineering Nanchang University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2015年第33卷第2期

页      面：148-153页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(51162022,21201098) Jiangxi Provincial Education Department(GJJ14126) 

主　　题：TiO2 rare earth hydroxyl groups hydrophilicity photocatalytic activity 

摘      要：Rare earth（Y, La and Nd） doped TiO2 thin films were prepared on glass slides by sol-gel method. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities. The effects of hydroxyl groups on hydrophilic and photocatalytic activities were investigated by means of techniques such as X-ray diffraction（XRD）, atomic force microscopy（AFM）, Fourier transform infrared（FTIR）, optical contact angle, UV-Visible spectroscopy and VIS spectroscopy. The results showed that an appropriate doping of rare earth could cause the TiO2 lattice distortion, inhibited phase transition from anatase to rutile, accelerated surface hydroxylation and produced more hydroxyl groups, which resulted in a denser surface and smaller grains（40–60 nm）, and a significant improvement in the hydrophilicity and photoreactivity of TiO2 thin films. The optimal content of rare earth was between 0.1 wt.% and 0.3 wt.%. Moreover, the modification mechanism of rare earth doping was also discussed.