Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (02): 505-512.doi: 10.3866/PKU.WHXB20110230

• CATALYSIS AND SURFACE SCIENCE • Previous Articles    

Effects of Rare Earth Ce Doping on the Structure and Photocatalytic Performance of ZnO

YU Chang-Lin1, YANG Kai1, YU Jimmy C2, PENG Peng1, CAO Fang-Fang1, LI Xin1, ZHOU Xiao-Chun1   

  1. 1. School of Materials and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P. R. China;
    2. Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, P. R. China
  • Received:2010-10-21 Revised:2010-12-13 Published:2011-01-25
  • Contact: YU Chang-Lin E-mail:yuchanglinjx@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21067004), Open Project Program of State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University), China (200906), Research Foundation of Education Bureau of Jiangxi Province, China (GJJ10150), and Natural Science Foundation of Jiangxi Province, China (2010GZH0048).

Abstract:

A series of ZnO photocatalysts doped with different amounts of cerium were prepared by co-precipitation and then calcined at different temperatures. The prepared pure ZnO and Ce-doped ZnO samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), UV-visible (UV-Vis) spectroscopy, and photoluminescence (PL) spectroscopy. The photocatalytic activity of the samples was evaluated by the photodegradation of acid orange II under UV light (λ=365 nm) irradiation. FT-IR results showed that ZnO doped with 2% (w, mass fraction) cerium had far more OH groups over the surface of the doped sample than the pure ZnO. At the same time, PL tests indicated that the presence of 2% (w) cerium effectively suppressed the recombination of the photogenerated hole-electron pairs. On the other hand, the calcination temperatures influenced the crystallinity and crystal size of the catalysts. XRD tests indicated that the sample calcined at 500 °C had good crystallinity and a small crystal size while elevated temperature treatment (600-800 °C) would result in sintering and increase the crystal size. At the optimal calcination temperature of 500 °C and at 2% (w) cerium doping the composite photocatalyst had much higher photocatalytic activity and stability compared with pure ZnO. The high photocatalytic performance of the Ce doped ZnO could be attributed to an increase in surface OH groups, high crystallinity and a low recombination rate of electron/hole (e-/h+) pairs.

Key words: Cerium doping, Zinc oxide, Calcination, Photocatalysis, OH group, Acid orange II

MSC2000: 

  • O643