Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (06): 1107-1110.doi: 10.3866/PKU.WHXB20090624

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Effect of Fe3+ Doping on Photocatalytic Activity of K2La2Ti3O10 for Water Decomposition to Hydrogen under Visible Light

CHEN Wei, DONG Xin-Fa, CHEN Zhi-Shan, CHEN Sheng-Zhou, LIN Wei-Ming   

  1. Guangdong Provincial Laboratory of Green Chemical Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China|School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
  • Received:2009-02-20 Revised:2009-03-20 Published:2009-06-05
  • Contact: DONG Xin-Fa E-mail:cexfdong@scut.edu.cn

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Abstract:

Undoped K2La2Ti3O10 and Fe3 + doped K2La2Ti3O10 samples were prepared by the sol-gel method and characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The effects of Fe3+ doping quantity on the properties and photocatalytic activity for hydrogen evolution were investigated. Results showed that Fe-doped K2La2Ti3O10 showed stronger absorption in the 400-650 nm range and this expanded to the visible light (λ>400 nm). Doping with Fe3+ raised the photocatalytic activity for hydrogen generation and the optimumamount of Fe3+ doping was found to be nFe/nTi=0.04. At this ratio and under visible light the rate of hydrogen evolution of Fe-K2La2Ti3O10 was 1.92 μmol·h-1 and this was 4 times higher than that of undoped K2La2Ti3O10 when 120 mL of reactive liquid (CH3OH(30 mL)+H2O(90 mL)) containing 0.1 g photocatalyst was used.

Key words: Photocatalysis, Fe3+-doped, K2La2Ti3O10, Visible light, Water decomposition, Hydrogen