Perovskite LaFeO3/montmorillonite nanocomposites: synthesis, interface characteristics and enhanced photocatalytic activity.
Perovskite LaFeO3/montmorillonite nanocomposites: synthesis, interface characteristics and enhanced photocatalytic activity.
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DOI：
10.1038/srep19723
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发表时间：
2016-01-18
影响因子：
4.6
通讯作者：
Ouyang J
中科院分区：
文献类型：
--
作者：
Peng K;Fu L;Yang H;Ouyang J
采用柠檬酸辅助溶胶-凝胶法制备了钙钛矿LaFeO3/蒙脱土纳米复合材料（LaFeO3/MMT）。结果表明：纳米LaFeO3均匀分布在蒙脱土表面，粒径主要在10 ~ 15 nm之间；通过可见光照射下LaFeO3/MMT对罗丹明B （Rhodamine B, RhB）的降解来评价LaFeO3/MMT的光催化活性，结果表明，LaFeO3/MMT在可见光照射90 min后，具有显著的吸附效率和良好的光催化活性，RhB的总去除率可达99.34%。探讨了界面特性和可能的降解机理。LaFeO3/MMT的界面表征表明，LaFeO3纳米颗粒可以通过Si-O-Fe键固定在蒙脱土表面。蒙脱土丰富的羟基、LaFeO3的半导体光催化和fenton类反应通过协同作用增强了光催化降解。因此，LaFeO3/MMT是一种具有良好工业应用前景的光催化剂，可以有效地处理染料废水。
Perovskite LaFeO3/montmorillonite nanocomposites (LaFeO3/MMT) have been successfully prepared via assembling LaFeO3 nanoparticles on the surface of montmorillonite with citric acid assisted sol-gel method. The results indicated that the uniform LaFeO3 nanoparticles were densely deposited onto the surface of montmorillonite, mainly ranging in diameter from 10 nm to 15 nm. The photocatalytic activity of LaFeO3/MMT was evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation, indicating that LaFeO3/MMT exhibited remarkable adsorption efficiency and excellent photocatalytic activity with the overall removal rate of RhB up to 99.34% after visible light irradiation lasting for 90 min. The interface characteristic and possible degradation mechanism were explored. The interface characterization of LaFeO3/MMT suggested that LaFeO3 nanoparticles could be immobilized on the surface of montmorillonite with the Si-O-Fe bonds. The abundant hydroxyl groups of montmorillonite, semiconductor photocatalysis of LaFeO3 and Fenton-like reaction could enhance the photocatalytic degradation through a synergistic effect. Therefore, the LaFeO3/MMT is a very promising photocatalyst in future industrial application to treat effectively wastewater of dyes.