溶剂热法合成Fe-CeO2与N-Fe-CeO2纳米粉体及其光催化性能
Solvothermal Synthesis and Photocatalytic Property of Fe-CeO2 and N-Fe-CeO2
作者单位E-mail
黄建平 湖南大学, 材料科学与工程学院, 长沙 410082 hjphit_1983@163.com 
陈芳 湖南大学, 材料科学与工程学院, 长沙 410082  
折小梅 湖南大学, 材料科学与工程学院, 长沙 410082  
王赫 湖南大学, 材料科学与工程学院, 长沙 410082  
石惠民 湖南大学, 物理与电子科学学院, 长沙 410082  
摘要: 采用溶剂热法合成了不同Fe掺杂含量的Fe-CeO2纳米粉体及不同氮源掺杂的N-10% Fe-CeO2nFe/(nFe+nCe)=10%)纳米粉体。利用TEM、XRD、XPS、Raman和UV-Vis等技术对其微观结构与形貌进行了表征,并通过降解亚甲基蓝溶液对其光催化性能进行了研究。结果表明,Fe掺杂可以提高CeO2的光催化性能,以10% Fe-CeO2催化效率最高,对亚甲基蓝的降解率从纯CeO2的67%提高到95%。而N的掺杂可调节10% Fe-CeO2催化性能。以浓氨水为氮源的N-10% Fe-CeO2(NH3·H2O-N-10% Fe-CeO2)的降解率可进一步提高到97%,并且具有较好的稳定性,经5次循环使用,对亚甲基蓝的光催化降解率仍高达89%。CeO2催化活性的提高主要由于掺杂Fe和N改变了CeO2的晶体结构与能带结构,促进了光生电子与空穴的产生与催化反应。
关键词: 掺杂  CeO2  溶剂热法  光催化
基金项目: 国家自然科学基金(No.51602100)、中国博士后基金(No.2015M572243)和中央高校基本科研业务费资助。
Abstract: Fe-CeO2 nanopowders with different dopant contents and N-10% Fe-CeO2 (nFe/(nFe+nCe)=10%) nanopowders using different N-including original materials were synthesized by solvothermal method. The morphology and structure of the nanopowders were analyzed by TEM,XRD,XPS,Raman and UV-Vis spectrometer. The photocatalytic activity was investigated by degrading methylene blue (MB) solution. The results show that the photocatalytic property of CeO2 can be improved by Fe doping. The photocatalytic efficiency reaches the highest for 10% Fe-CeO2, which improve the degradation rate of pure CeO2 from 67% to 95%. N doping can adjust the photocatalytic property of 10% Fe-CeO2. Using concentrated ammonia as N-including original material, the degradation rate of NH3·H2O-N-10% Fe-CeO2 can be further increased to 97%. Moreover, NH3·H2O-N-10% Fe-CeO2 catalyst has excellent performance stability. The photocatalystic degradation rate of MB still remains 89% when the catalyst undergoes 5 recycles usage. The enhanced photocatalytic efficiency can be attributed to the changes of the phase structure and energy band of CeO2 by doping Fe and N, which contribute the production of electrons and holes and their catalystic reaction.
Keywords: doping  CeO2  solvothermal  photocatalysis
投稿时间:2017-09-29 修订日期:2018-01-19
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黄建平,陈芳,折小梅,王赫,石惠民.溶剂热法合成Fe-CeO2与N-Fe-CeO2纳米粉体及其光催化性能[J].无机化学学报,2018,34(5):834-842.
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