Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (06): 1095-1099.doi: 10.3866/PKU.WHXB20080632

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Effect of Surface Modification by Ni2+ on Photocatalysis Activity of TiO2

LUO Da-Chao; ZHANG Lan-Lan; LONG Hui-Jin; CHEN Yong-Mei; CAO Ya-An   

  1. School of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China; College of Physics, Nankai University, Tianjin 300071, P. R. China
  • Received:2007-11-15 Revised:2008-03-21 Published:2008-06-03
  • Contact: CHEN Yong-Mei

Abstract: Sol-gel process was employed to prepare TiO2 and nickle-modified TiO2 powders. Photodegradation of 4-chlorophenol was employed to evaluate the photocatalytic activities of the catalysts. Compared to TiO2, nickle-modified TiO2 exhibited improved activity for degradation of 4-chlorophenol under both ultraviolet and visible light irradiations. The properties of these catalysts were investigated with X-ray diffraction (XRD), diffuse reflectance UV-Vis spectra, infrared spectra (IR), Raman spectra, and surface photovoltage spectroscopy (SPS). We found that Ni2+ was chemisorbed on the surface of TiO2 and formed ONiOO, which introduced the energy level of surface states 2.84 eV above the valence band. This energy level not only generated response to visible light but also promoted the separation of photogenerated carriers. Thus, the activity under ultraviolet and visible light irradiations was increased.

Key words: TiO2, Surface modification, Surface photovoltage spectroscopy, Photocatalysis activity


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