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Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

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Volume: 14 | Issue: 1 | Pages: 280-292
DOI: 10.4209/aaqr.2013.02.0053
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Yi-Hsing Lin, Wen-Chi Hung, Yu-Chun Chen, Hsin Chu

  • Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan

Abstract

The nano-sized V/TiO2 prepared by a sol-gel method calcined at 500°C for 3 h was characterized in this study. The synthesized photo-catalysts were used for the photo-degradation of 1, 2-dichloroethane (1, 2-DCE). From X-ray powder diffraction data, the crystal phase presents the mixture of anatase and rutile phases with anatase the dominant phase. From TEM images, the crystallites of photo-catalysts are spherical particles with a crystallite size about 10–20 nm. UV-Visible absorption spectra of V/TiO2 show a slightly increase in absorbance in the visible light region with the increasing vanadium ion doping concentration. The X-ray photoelectron spectroscopy results indicate that the doped vanadium ions exist in the form of V (IV). The V (IV) may alleviate the surface poison phenomenon and act as both h+/e traps to reduce the recombination rate of h+/e pairs, and the optimum vanadium doping amount is 0.01 mol%. The products and byproducts of 1, 2-DCE photo-degradation include H2O, CO, CO2, C2H5Cl, CH2Cl2, and HCl.

Keywords

Photo-catalytic degradation 1, 2-dichloroethane Titanium dioxide V-doped TiO2


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