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

10.4209/aaqr.2013.02.0053

Yi-Hsing Lin；Wen-Chi Hung；Yu-Chun Chen；Hsin Chu

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

Aerosol and Air Quality Research

14卷1期（2014 / 02 / 01）

280 - 292

英文

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.