溶剂热法合成Fe-CeO2与N-Fe-CeO2纳米粉体及其光催化性能

采用溶剂热法合成了不同Fe掺杂含量的Fe-CeO_2纳米粉体及不同氮源掺杂的N-10%Fe-CeO_2(n_(Fe)/(n_(Fe)+n_(Ce))=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CeO_2的光催化性能,以10%Fe-CeO_2催化效率最高,对亚甲基蓝的降解率从纯CeO_2的67%提高到95%。而N的掺杂可调节10%Fe-CeO_2催化性能。以浓氨水为氮源的N-10%Fe-CeO_2(NH_3·H_2O-N-10%Fe-CeO_2)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%。CeO_2催化活性的提高主要由于掺杂Fe和N改变了CeO_2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。

Solvothermal Synthesis and Photocatalytic Property of Fe-CeO2 and N-Fe-CeO2

Fe-CeO₂ nanopowders with different dopant contents and N-10% Fe-CeO₂ (n_Fe/(n_Fe+n_Ce)=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.