Volume 14, No. 1, February 2014, Pages 280-292 PDF(1.59 MB)
Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct
Yi-Hsing Lin, Wen-Chi Hung, Yu-Chun Chen, Hsin Chu
Department of Environmental Engineering, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan
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.
Photo-catalytic degradation; 1, 2-dichloroethane; Titanium dioxide; V-doped TiO2.