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Dispersed optically pure anatase, rutile and two-phase samples of titanium dioxide were preparedusing a sol-gel technique. In particle of two-phase samples, the anatase nuclei are surrounded by arutile envelope. Content of anatase in the two-phase particles varied between 20 and 80%. Particles of allthe TiO2 samples had a globular shape of diameter between 10 and 30 μm. When compared to the correspondingtechnical-grade samples, the optically pure anatase and rutile demonstrated higher photocatalyticactivity in the destruction of tetradecylpyridinium chloride, Methylene Blue and tetrachlorofluorescein aswell as in reduction of Cr2O7, MnO4, [Fe(CN)6]3− and [Fe(CN)6]4−. The photocatalytic reactions bring about the reduction of the inorganic anions to yield water insoluble substances and mineralization of theorganic compounds. Rate constant of the all above processes do not depend on specific surface area of TiO2and adsorption of the substrates on the TiO2 samples. The rutile calcined at 1027K exhibits the highestspecific rate constants. Exposure to γ-radiation increases photocatalytic activity of the dispersed TiO2. The influence of TiO2 and substrate on the photocatalytic reactions is caused by the influence of these factorson the formation of reactive electron hole pair and on the efficiency of the interfacial electron transfer

Photocatalytic activity of spectro-pure titanium dioxide: Effects of crystalline structure, specific surface area and sorption properties