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Preparation And Photocatalytic Activity Of Ceo_2/tio_2 Interface Composite Film

机译：Ceo_2 / tio_2界面复合膜的制备及光催化活性

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摘要

The CeO_2/TiO_2 and TiO_2/CeO_2 interface composite films were prepared on glass substrates by the sol-gel process via dip-coating and calcining technique. The scanning electron microscopy (SEM) revealed that the TiO_2 layer has a compact and uniformity glasslike surface with 200 nm in thickness, and the CeO_2 layer has a coarse surface with 240 nm in thickness. The X-ray diffractometer (XRD) analysis showed that the TiO_2 layer is made up of anatase phase, and the CeO_2 layer is structured by cubic fluorite phase. Through a series of photo-degradation experiments, the relationship of the photocatalytic activity with the constituents of the films was studied. In virtue of the efficient interfacial charge separation via the process of electron transfer from TiO_2 to CeO_2, the photocatalytic activity of the CeO_2/TiO_2 composite film is high. Contrarily, the photocatalytic activity of the TiO_2/CeO_2 composite film is low, due to its inert surface made up of CeO_2 with broad bandwidth. Apart from the effect of the film structure, the effect of film thickness on photocatalytic activity was also discussed.
机译：通过浸涂和煅烧技术，通过溶胶-凝胶法在玻璃基板上制备了CeO_2 / TiO_2和TiO_2 / CeO_2界面复合膜。扫描电子显微镜（SEM）表明，TiO_2层具有致密且均匀的玻璃状表面，厚度为200nm，而CeO_2层具有粗糙的表面，厚度为240nm。 X射线衍射仪（XRD）分析表明TiO_2层由锐钛矿相组成，CeO_2层由立方萤石相组成。通过一系列的光降解实验，研究了光催化活性与薄膜成分的关系。借助于电子从TiO_2转移到CeO_2的过程中有效的界面电荷分离，CeO_2 / TiO_2复合膜的光催化活性很高。相反，TiO_2 / CeO_2复合膜的惰性表面由宽带宽的CeO_2构成，因此其光催化活性较低。除了膜结构的影响，还讨论了膜厚度对光催化活性的影响。

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