| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 94 === A highly donor-doped (110) layered perovskite, La2Ti2O7, was found to be an efficient photocatalyst under UV irradiation. The activity depended on the crystalline phase and the surface area of perovskite oxide. The grinding methods of the mixed oxide precursors before sintering as well as the sintering temperature affected the crystalline phase and the surface area of the formed perovskite. La2Ti2O7 in this study was prepared by solid state reaction (SSR) and the obtained powders were characterized by XRD, SEM, UV-DRS, XPS and zeta potential.
Photocatalytic degradation of dye and IPA in aqueous solution by UV/ La2Ti2O7 process was studied. The experiments were carried out under solution pH, initial concentration of RR22 and IPA, UV light intensity and catalyst loading. Photocatalytic degradation of RR22 and IPA in aqueous solution by UV/ La2Ti2O7 process was increased with increasing UV light intensity and catalyst loading. Photocatalytic degradation of RR22 and IPA in aqueous solution by UV/ La2Ti2O7 process was decreased with increasing initial concentration. Photocatalyst degradation was better in acid than in alkaline solution for IPA in aqueous solution by UV/ La2Ti2O7 process but the experimental trend of RR22 was different from IPA. The reaction rate of photocatalytic degradation was faster at pH=3.0, the slowest at pH=7.0 and that suddenly increased at solution pH 8.0~11.0. Reaction rate of RR22 photocatalytic degradation was faster than that of photolysis in acidic solution but reaction rate of RR22 photocatalytic degradation was slower than that of photolysis at pH=10.0~pH=11.0.
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