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Citation: LUO Da-Chao, ZHANG Lan-Lan, LONG Hui-Jin, CHEN Yong-Mei, CAO Ya-An. Effect of Surface Modification by Ni²⁺ on Photocatalysis Activity of TiO₂[J]. Acta Physico-Chimica Sinica, ;2008, 24(06): 1095-1099. doi: 10.3866/PKU.WHXB20080632 shu

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

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 Date: 15 November 2007
Available Online: 22 April 2008

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.
- TiO2; Surface modification; Surface photovoltage spectroscopy; Photocatalysis activity
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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