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TiO 2  of anatase structure was modified with H 2 WO 4  by wet impregnation method in a vaccuum evaporator and in autoclave under established temperature and pressure. After impregnation the samples were dried and submitted to calcination at 400 and 600 °C. The characteristics of obtained photocatalysts was investigated by XRD, UVVis/ DR, BET surface area, zeta potential, photoluminescence and OH radicals measurements. These photocatalysts were tested for photocatalytic decomposition of Acid Red, Methylene Blue, phenol and humic acids in water. The results showed that the presence of tungsten oxides compounds on the surface of TiO 2  is beneficial because improves separation of free carriers what results in increasing the OH radicals formation on the photocatalyst surface. Calcination of the photocatalysts causes growing of the anatase crystals and results in reduction of their BET surface area. This is beneficial for OH radicals formation on the surface of anatase crystals, however adsorption abilities of such prepared photocatalysts are lower. In that case some organic compounds like phenol, which undergoes decomposition mainly by OH radicals attack, can be efficiently decomposed with using these photocatalysts. In case of uncalcined samples, they have high BET surface area and they can quantatively adsorb some organic compounds such as Acid Red and humic acids. By combination of adsorption with photocatalytic activity of uncalcined samples fast decomposition of organic compounds was achieved due to their fast oxidation by the formed reactive species under both, UV and artificial solar light irradiations, however this activity was much more higher under UV light.

Activity of TiO 2 Photocatalyst Modified with H 2 WO 4 for Degradation of Organic Compounds in Water