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纳米薄膜的制备及其光催化性能研究(3)
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摘要:图8 Ce-ZnO@TiO2光催化降解机理图Fig.8 Photocatalytic degradation mechanism of Ce-ZnO@TiO2 3结论 本文对低温常压水热法制备的ZnO纳米花进行稀土Ce掺杂,并与TiO2纳米纤维
图8 Ce-ZnO@TiO2光催化降解机理图Fig.8 Photocatalytic degradation mechanism of Ce-ZnO@TiO2
3结论
本文对低温常压水热法制备的ZnO纳米花进行稀土Ce掺杂,并与TiO2纳米纤维构建异质结,得到Ce-ZnO@TiO2宏观薄膜光催化剂。Ce的掺入使得ZnO光生电子的运动行为发生改变,直接进入Ce离子的外层电子层而避免与空穴复合。ZnO纳米花和TiO2纳米纤维交织生长,形成“枝繁叶茂”的结构特点,光吸收面增大,催化反应位点增多,加之稀土Ce本身可吸收紫外和可见光区的电磁辐射,提高了太阳光利用率。设计了“过滤型”光催化降解实验装置,结果表明,以上功能修饰策略普遍提高了ZnO材料的光催化活性,同时,Ce-ZnO@TiO2宏观膜形态的光催化剂易于回收重复利用,具备实际应用潜力。
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