以Ce(NO₃)₃·6H₂O和三聚氰胺为原料,采用简单的原位聚苯乙烯球模板法成功合成了一种新型CeO₂纳米中空球/g-C₃N₄纳米复合材料。将其用于紫外光催化降解对硝基苯胺(PNA)。结果表明,当CeO₂的复合质量分数为2.5 %时,PNA降解效率达到90.26 %。动力学拟合结果表明,PNA光催化降解过程符合拟一级反应动力学特征。与g-C₃N₄(k=0.006 0 min^-1)和CeO₂(k=0.002 3 min^-1)相比,CeO₂纳米中空球/g-C₃N₄复合材料光催化降解PNA的反应速率常数(k=0.011 0 min^-1)分别提高了1.8倍和4.8倍。CeO₂和g-C₃N₄复合后形成的异质结构促进了光生载流子的分离,延长了光生载流子的寿命,从而显著提高了光催化性能。

A novel CeO₂-based nano hollow sphere/g-C₃N₄ nanocomposite is successfully synthesized through a simple in-situ polystyrene ball template method by using Ce(NO₃)₃? 6H₂O and melamine as raw materials,and used for the degradation of p-nitroaniline (PNA) under ultraviolet light irradiation.The results indicate that the degradation rate of PNA reaches 90.26 % when the mass fraction of CeO₂ in the composite is 2.5 %.It is verified through dynamic fitting that the photocatalytic degradation process of PNA conforms to the characteristics of pseudo first-order reaction kinetics.PNA degradation rate constant (k=0.011 0 min^-1) of CeO₂ hollow nanospheres/g-C₃N₄ composite is 2.8 times and 5.8 times those of g-C₃N₄(k=0.006 0 min^-1) and CeO₂(k=0.002 3 min^-1),respectively.The heterostructure formed between CeO₂ and g-C₃N₄ promotes the separation of photo generated carriers and prolongs their lifespan,thereby improves the photocatalytic performance.

刘玉娇(2000-),女,硕士生,研究方向为环境光催化,1747233579@qq.com