Effects of trifluoroacetic acid modification on the surface microstructures and photocatalytic activity of mesoporous TiO2 thin films
Effects of trifluoroacetic acid modification on the surface microstructures and photocatalytic activity of mesoporous TiO2 thin films
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DOI：
10.1021/la025775v
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发表时间：
2003-03
期刊：
影响因子：
3.9
通讯作者：
Jimmy C. Yu;W. Ho;Jiaguo Yu;and S. K. Hark;Kwansai Iu
中科院分区：
文献类型：
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作者：
Jimmy C. Yu;W. Ho;Jiaguo Yu;and S. K. Hark;Kwansai Iu
研究了三氟乙酸（TFA）对溶胶-凝胶型TiO2薄膜光催化活性的增强作用。采用N2吸附、傅里叶变换红外光谱、紫外可见光谱、x射线光电子能谱、光致发光光谱、x射线衍射、原子力显微镜和差热分析/热重分析等方法对薄膜进行了表征。通过空气中丙酮的光催化分解，评价了薄膜的光催化活性。结果表明，TFA以三氟乙酸配合物的形式吸附在TiO2薄膜表面。改性后的TiO2薄膜的光催化活性高于未改性的TiO2薄膜，其中250℃处理的改性膜的光催化活性最高。这是由于结合在TiO2表面的TFA配合物起到了电子清除剂的作用，从而减少了光生电子和空穴的复合....
Enhancement of the photocatalytic activity of sol−gel-derived TiO2 thin films by a simple treatment with trifluoroacetic acid (TFA) was investigated. The thin films were characterized with N2 adsorption, Fourier transform infrared spectroscopy, UV−visible spectroscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, X-ray diffraction, atomic force microscopy, and differential thermal analysis/thermogravimetry analysis. The photocatalytic activity of the thin films was evaluated by the photocatalytic decomposition of acetone in air. The results show that TFA is chemisorbed on the surface of the TiO2 films as a trifluoroacetate complex. The photocatalytic activity of modified TiO2 thin films is higher than that of unmodified TiO2 thin films, and the modified film treated at 250 °C shows the highest activity. This is ascribed to the fact that the TFA complex bound on the surface of TiO2 acts as an electron scavenger and, thus, reduces the recombination of photogenerated electrons and holes....