SO42-/TiO2 catalyst prepared by microwave method and the research of its photocatalytic oxidation activity

SO42-/TiO2 catalysts were prepared by microwave, composite and conventional methods and charac--- terized by X-ray diffraction (XRD), N-2 sorption analysis applying BET method, UV-Vis diffuse reflection spectroscopy (DRS) and laser Raman spectrum. The effect of different preparation methods on photocatalytic oxidation of C2H4 in air stream was studied. The results showed that the photocatalytic activity was obviously increased by the microwave method, The conversion of ethylene was 80% contrast to those of composite and conventional methods being only 58% and 41%, respectively. The catalyst by microwave method exhibited higher content of anatase, higher specific surface area, larger band gap. The Raman scattering shifted to low wave number direction helped to increase the transition probability of photon-generated electrons and improved photoefficiency.