Photocatalytic Activity and Characterization of Carbon-Modified Titania for Visible-Light-Active Photodegradation of Nitrogen OxidesReportar como inadecuado

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International Journal of PhotoenergyVolume 2012 2012, Article ID 548647, 13 pages

Research Article

Product Development Division, Daxin Material Co., No. 15, Keyuan 1st Road, Central Taiwan Science Park, Taichung 40763, Taiwan

ITRI South, Industrial Technology Research Institute, Room 602, Building 3, 31 Gongye 2nd Road, Annan District, Tainan 70955, Taiwan

Department of Chemical Engineering, National Tsing-Hua University, Hsinchu 30043, Taiwan

Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung 41101, Taiwan

Received 15 July 2011; Revised 24 October 2011; Accepted 24 October 2011

Academic Editor: Jinlong Zhang

Copyright © 2012 Chun-Hung Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A variety of carbon-modified titania powders were prepared by impregnation method using a commercial available titania powder, Hombikat UV100, as matrix material while a range of alcohols from propanol to hexanol were used as precursors of carbon sources. Rising the carbon number of alcoholic precursor molecule, the modified titania showed increasing visible activities of photodegradation. The catalyst modified with cyclohexanol exhibited the best activities of 62%, 62%, 59%, and 54% for the total removal under UV, blue, green, and red light irradiation, respectively. The high activity with long wavelength irradiation suggested a good capability of photocatalysis in full visible light spectrum. Analysis of UV-visible spectrum indicated that carbon modification promoted visible light absorption and red shift in band gap. XPS spectroscopic analysis identified the existence of carbonate species C=O, which increased with the increasing carbon number of precursor molecule. Photoluminescence spectra demonstrated that the carbonate species suppressed the recombination rate of electron-hole pair. As a result, a mechanism of visible-light-active photocatalyst was proposed according to the formation of carbonate species on carbon-modified TiO2.

Autor: Chun-Hung Huang, Yu-Ming Lin, I-Kai Wang, and Chun-Mei Lu



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