可控合成具有增强光催化性能的CeO_(2)纳米中空球/g-C_(3)N_(4)纳米复合材料

Controllable synthesis of CeO_(2)hollow nanospheres/g-C_(3)N_(4)nanocomposites with enhanced photocatalytic performance

以Ce(NO_(3))_(3))·6H_(2))O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CeO_(2)纳米中空球/g-C_(3)N_(4)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CeO_(2)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-C_(3)N_(4)(k=0.0060 min^(-1))和CeO_(2)(k=0.0023 min^(-1))相比,CeO_(2)纳米中空球/g-C_(3)N_(4)复合材料光催化降解PNA的反应速率常数(k=0.0110 min^(-1))分别提高了1.8倍和4.8倍。CeO_(2)和g-C_(3)N_(4)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 CeO_(2)-based nano hollow sphere/g-C_(3)N_(4)nanocomposite is successfully synthesized through a simple in-situ polystyrene ball template method by using Ce(NO_(3))_(3)6H_(2)O 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 CeO_(2)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=0.0110 min^(-1))of CeO_(2)hollow nanospheres/g-C_(3)N_(4)composite is 2.8 times and 5.8 times those of g-C_(3)N_(4)(k=0.0060 min^(-1))and CeO_(2)(k=0.0023 min^(-1)),respectively.The heterostructure formed between CeO_(2)and g-C_(3)N_(4)promotes the separation of photo generated carriers and prolongs their lifespan,thereby improves the photocatalytic performance.