Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (05): 761-764.doi: 10.3866/PKU.WHXB20070527

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Synthesis and Photocatalytic Decomposition of Water under Visible Light Irradiation of La2Ti2-xCoxO7 with Pyrochlore Structure

LI Hong-Jian; CHEN Gang; LI Zhong-Hua; ZHOU Chao   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China
  • Received:2006-10-25 Revised:2006-12-27 Published:2007-04-28
  • Contact: CHEN Gang

Abstract: Photocatalysts La2Ti2-xCoxO7(x=0, 0.05, 0.10, 0.20) with pyrochlore structure were synthesized by sol-gel method. XRD, FT-IR, BET, and UV-Vis diffuse reflectance spectroscopy were used to characterize the crystal structure, specific surface area, and diffuse reflectance spectra, respectively, the formation rate of hydrogen was measured by the photocatalytic activity measurement device and gas chromatography (GC). The results indicated that the absorption pattern of La2Ti2O7 was only generated in the ultraviolet region but La2Ti2O7 with Co doping at B site had strong photoabsorption in the visible light region. The evolution rate of H2 in photolysis of H2O by the La2Ti2-xCoxO7 photocatalysts which doped with Co at B site was highter than that of undoped La2Ti2O7. La2Ti1.9Co0.1O7 showed the best photocatalyst property in all photocatalysts of La2Ti2-xCoxO7 (x=0-0.20).

Key words: Sol-gel method, Photocatalyst, Pyrochlore structure, Water splitting


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