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Acta Phys. -Chim. Sin.  2013, Vol. 29 Issue (10): 2232-2238    DOI: 10.3866/PKU.WHXB201308291
CATALYSIS AND SURFACE SCIENCE     
Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene
ZHAO Wei-Rong, XI Hai-Ping, LIAO Qiu-Wen
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China
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Abstract  

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 wordsHydrothermal method      Impregnation-calcination method      Electrochemical      Density functional theory      Volatile organic compounds      CO2     
Received: 21 May 2013      Published: 29 August 2013
MSC2000:  O643  
Fund:  

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

Corresponding Authors: ZHAO Wei-Rong     E-mail: weirong@mail.hz.zj.cn
Cite this article:

ZHAO Wei-Rong, XI Hai-Ping, LIAO Qiu-Wen. Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene. Acta Phys. -Chim. Sin., 2013, 29(10): 2232-2238.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201308291     OR     http://www.whxb.pku.edu.cn/Y2013/V29/I10/2232

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