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Fe₃O₄纳米纤维及Fe₃O₄@CeO₂/Ag纳米材料的制备及其光催化性能

Synthesis of Fe₃O₄ nanofibers and Fe₃O₄@CeO₂/Ag nanocomposites and the photocatalytic properties

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【Author】 Jiali Chang;Qingliang Ma;Jianchao Ma;Mengfan Gao;Qingwen Lin;Hongzhu Ma;School of Chemistry and Chemical Engineering,Shaanxi Normal University;Taiyuan University of Technology;

【机构】陕西师范大学化学化工学院；太原理工大学；

【摘要】采用水热法—共沉淀法制备了Fe₃O₄纳米纤维和磁性Fe₃O₄@CeO₂/Ag纳米复合材料。通过XRD、FTIR和TEM等分析测试手段对其结构等进行表征。结果表明,柠檬酸钠的浓度和反应时间对Fe₃O₄纳米晶的形成有很大的影响;循环伏安和充放电测试结果表明,Fe₃O₄纳米纤维电化学性能良好。Fe₃O₄@CeO₂/Ag纳米复合材料对有机污染物的光催化性能和稳定性实验结果表明:Fe₃O₄@CeO₂/Ag在可见光催化下具有优异的光催化活性,光催化降解亚甲基蓝、苯酚和甲基橙的效率分别为94.1%、83.9%、74.2%,并具稳定的光催化性能和良好的磁响应性。对其光催化降解的机理进行了探讨。研究表明:在Fe₃O₄@CeO₂/Ag光催化降有机污染物的过程中,Ag和CeO₂异质结不仅有效地提高光吸收能力而且促进电子空穴对的分离和转移。Fe₃O₄纳米线因具有较大的比表面积和良好的导电性能,更有利于其对有机污染物的吸附及电子空穴对的转移。以上结果表明,Fe₃O₄纳米纤维应用于电容器的电极材料具有很大的潜力,Fe₃O₄@CeO₂/Ag复合纳米材料可作为一种有效的可见光光催化剂。更多还原

【Abstract】 One dimensional Fe₃O₄ nanofibers and ternary magnetic Fe₃O₄ nanowire@CeO₂/Ag core–shell nanocomposites are synthesized by means of hydrothermal and co-precipitation techniques.Their morphology and structure are explored using XRD,FT-IR,TEM,SEM,XPS and DRS.The results show that Na3 cit was used as a capping agent in the formation of the Fe₃O₄ nanofibers and the Fe₃O₄ crystal nuclei were generated from different Fe2+?citrate complexes under hydrothermal conditions.Ag and CeO₂ nanoparticles are uniformly deposited on the surface of Fe₃O₄ nanowires.The photocatalytic experiments demonstrate that the Fe₃O₄@CeO₂/Ag nanocomposites exhibit remarkably enhanced photocatalytic properties and stability compared with CeO₂,CeO₂/Ag,Fe₃O₄@CeO₂ under natural sunlight exposure.Moreover,excellent photocatalytic degradation efficiency for phenol and MO are also observed.The results indicate that Fe₃O₄ nanofibers have a specific capacitance and good cycling performance,and Fe₃O₄@CeO₂/Ag can be used an an effective visible light photocatalyst.更多还原