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Thermal treatment in air has a marked influence on the adsorption of oxygen and the photocatalytic activities of TiO 2 (P25) for the oxidation of acetone in air. The photoactivity of TiO 2 increases with the increase of thermal treatment temperature until 400 °C, above which more rutile is formed. On the basis of the photocatalytic performance of TiO 2 thermally treated in a vacuum and the results of polycrystalline X-ray diffraction analysis, BET surface area, adsorption oxygen measurements and ESR spectra, the increase in photoactivity can be attributed to a catalyst surface with more adsorbed oxygen. This would generate more superoxide anion radicals under UV irradiation, resulting in a better separation of photoexcited electrons and holes.
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Yu et al. (2000) studied this question.
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