La2Ti2O7 為一種層狀的perovskite結構，並且在紫外線的照射下可以產生光觸媒的特性，它的活性主要是因為特殊的晶相及觸媒的表面積。在固態反應法的製備過程中，研磨和燒結溫度的高低對於perovskite結構晶相的形成和觸媒表面積的大小有著很大的影響。在本研究中La2Ti2O7 由固態反應法製備而成，而其特性則分別使用XRD、SEM、UV-DRS、ESCA和界達電位儀進行分析。
本研究係利用紫外線/ La2Ti2O7 程序分別處理含染料及異丙醇水溶液，探討溶液pH值、反應物初始濃度、紫外線光強度和觸媒添加量對反應物去除率的影響。紫外線/ La2Ti2O7程序光分解含染料及IPA水溶液時，由實驗結果顯示，隨著反應物的初始濃度降低、紫外線光強度及觸媒添加量的增加，皆會使得染料及異丙醇的去除率增加。對於IPA光分解的反應系統而言，在酸性溶液中的去除率比在鹼性溶液中高，而其反應趨勢與染料的光分解系統不同。在染料的光分解系統中當溶液的pH值為3.0時反應較快，而在溶液pH值為7.0時反應速率最慢，而反應速率會突然增加當溶液pH值在8.0到11.0。此實驗結果是因為染料在酸性條件中光催化的反應速率會比光解的反應速率快，而在溶液pH值大於10時，光催化的反應速率會比光解速率慢。

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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