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

稀土学报(英文版), 2015, (2): 148-153. doi: 10.1016/S1002-0721(14)60395-1

杜军 ^1, , 吴其 ^2, , 钟汕 ^3, , 顾馨 ^4, , 刘娇 ^5, , 郭海志 ^6, , 张文龙 ^7, , 彭海龙 ^8, , 邹建国 ^9,

基金项目: the National Natural Science Foundation of China(51162022,21201098) Jiangxi Provincial Education Department (GJJ14126)Acknowledgements:The authors would like to thank the Test Foundation of Nanchang University(2012020)

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

Keywords： TiO2

Rare earth (Y, La and Nd) doped TiO2 thin films were prepared on glass slides by sol-gel method. The photocatalytic de-composition 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 diffrac-tion (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, inhib-ited 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.

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

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