Photocatalytic WO3/TiO2 nanoparticles working under visible light

WO3/TiO2 was prepared by modifying the surface of TiO2 with clusters of crystallized WO3. Previously, we have reported that the TiO2 covered with the monolayer of WO3 shows greatly enhanced photocatalytic activity under UV light in decomposing VOCs. Here we report that the WO3/TiO2 can also be activated by visible light in the photocatalytic decomposition of gaseous 2-propanol. The structure of WO3/TiO2 was examined by X-ray diffraction (XRD), TEM, UV-Visible and Raman spectra. The samples with 10 mol% of WO3 annealed at 700 degrees C provide the optimum photocatalytic efficiency in visible range. We also suggest the mechanism for the WO3/TiO2 working under visible light.