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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (06): 1509-1515    DOI: 10.3866/PKU.WHXB20110624
CATALYSIS AND SURFACE SCIENCE     
Preparation and Visible Light Photocatalytic Activity of Titanium Dioxide Coated Multiwalled Carbon Nanotubes
CONG Ye, QIN Yun, LI Xuan-Ke, DONG Zhi-Jun, YUAN Guan-Ming, CUI Zheng-Wei
Hubei Key Laboratory of Coal Conversion and New Carbon Materials, College of Chemical Engineering and Technology, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
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Abstract  

Titanium dioxide coated multiwalled carbon nanotubes (MWCNTs) composite photocatalysts were prepared by the controllable oxidation of titanium carbide coated MWCNTs obtained by the molten salt method using MWCNTs as a reaction template and metal titanium powder as a titanium source. The effects of the molten salt reaction temperature, the molar ratio of MWCNTs to titanium powder, and the oxidation temperature on the structure and morphology of the products were investigated. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The photodegra- dation of a methylene blue (MB) solution was used to evaluate the photocatalytic activity of the catalyst under visible light irradiation (λ>420 nm). The results suggest that the TiO2 coated MWCNTs keep the similar fibred morphology with the pristine MWCNTs. Uniform and fine well-dispersed TiO2 coatings on the surface of MWCNTs closely contact with the MWCNTs support and Ti-O-C chemical bonds form between them. The prepared TiO2/MWCNTs photocatalyst shows higher visible light photocatalytic activity because the MWCNTs increase the adsorption of methylene blue on the photocatalyst and an impurity state is formed close to the valence band of titanium dioxide, which can enhance the absorption and utilization of solar energy.



Key wordsCarbon nanotube      Titanium dioxide      Carbon doping      Coating      Photocatalysis     
Received: 14 January 2011      Published: 05 May 2011
MSC2000:  O643  
Fund:  

The project was supported by the National Natural Science Foundation of China (20803054, 50972110).

Corresponding Authors: LI Xuan-Ke     E-mail: xkli8524@sina.com
Cite this article:

CONG Ye, QIN Yun, LI Xuan-Ke, DONG Zhi-Jun, YUAN Guan-Ming, CUI Zheng-Wei. Preparation and Visible Light Photocatalytic Activity of Titanium Dioxide Coated Multiwalled Carbon Nanotubes. Acta Physico-Chimica Sinica, 2011, 27(06): 1509-1515.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110624     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I06/1509

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