Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (10): 2232-2238.doi: 10.3866/PKU.WHXB201308291

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene

ZHAO Wei-Rong, XI Hai-Ping, LIAO Qiu-Wen   

  1. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China
  • Received:2013-05-21 Revised:2013-08-27 Published:2013-09-26
  • Contact: ZHAO Wei-Rong
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51178412, 51278456) and Zhejiang Provincial Education Department Scientific Research Projects, China (Z201122663).


Based on hydrogen titanate nanotubes prepared by a low-temperature hydrothermal technique, Cu-doped titania nanotube (Cu-TNT) catalysts were prepared using absorption-calcination methods. They were characterized by X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS), and electrochemical techniques. Density functional theory (DFT) was used to calculate the nanotube band structure and density of states. Cu/Ti atomic ratios in the synthesized powders were very close to the nominal values, and the Cu-doped TiO2 lattice exhibited improved visible-light absorption. This was because the valence band, formed by hybridization of O 2p states with Cu 3d states, was negatively shifted. Thus, the band gap was reduced to 2.50-2.91 eV and the samples exhibited visible-light responses. Toluene was chosen as a model pollutant to evaluate the removal capacity and the CO2 mineralization rate of volatile organic compounds under visible light. Pure TNT displayed poor visible-light activity, and the activities of samples with >0.1% Cu doping were also weak. Samples doped with 0.1% Cu exhibited optimumvisible-light photocatalytic oxidation activity, with a 77%toluene degradation efficiency and a 59%mineralization rate in 7 h.

Key words: Hydrothermal method, Impregnation-calcination method, Electrochemical, Density functional theory, Volatile organic compounds, CO2


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