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介孔电气石/TiO2复合材料的制备及其模拟太阳光光催化性能

, PP. 1481-1489

Keywords: 电气石,TiO2,光催化降解,溶胶-凝胶,溶剂热合成,罗丹明B,诺氟沙星

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Abstract:

采用一步溶胶-凝胶共缩合结合溶剂热合成技术制备出一系列介孔电气石/TiO2复合材料,表征了复合材料的相结构、形貌、孔隙率、光吸收性质以及组成结构.结果表明:制备的电气石/TiO2复合材料具有纯锐钛矿晶相、均匀的介孔结构、较大的比表面积(205~242m2·g-1)、均匀的孔径分布(3.4~3.8nm)以及较低的带隙能(3.0eV).在模拟太阳光照射下,电气石/TiO2复合材料可以被成功地应用于水中有机污染物罗丹明B和诺氟沙星的降解.降解动力学研究表明:电气石的掺杂提高了TiO2的光催化量子效率,降低了TiO2的带隙能.对罗丹明B的降解,电气石掺杂量为1wt%~5wt%的电气石/TiO2复合材料表现出比纯TiO2更高的降解速率,对诺氟沙星的降解,电气石/TiO2复合材料的降解速率高于纯TiO2的.

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