Citation: ZHAO Wei-Rong, XI Hai-Ping, LIAO Qiu-Wen. Cu-Doped Titania Nanotubes for Visible-Light Photocatalytic Mineralization of Toluene[J]. Acta Physico-Chimica Sinica, ;2013, 29(10): 2232-2238. doi: 10.3866/PKU.WHXB201308291 shu

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

1.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China

Received Date: 21 May 2013
Available Online: 29 August 2013
Fund Project: 国家自然科学基金(51178412, 51278456) (51178412, 51278456)浙江省教育厅科研项目(Z201122663)资助 (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.
- Hydrothermal method,
- Impregnation-calcination method,
- Electrochemical,
- Density functional theory,
- Volatile organic compounds,
- CO₂
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沈阳化工大学材料科学与工程学院沈阳 110142