贵金属负载ZnFe_(2)O_(4)基复合光催化剂及其光催化性能研究

Study on noble metal supported ZnFe_(2)O_(4)-based composite photocatalysts and their photocatalytic properties

磁性可分离ZnFe_(2)O_(4)-ZnO-Pt纳米光催化剂通过浸渍、煅烧和还原的工艺制备。采用XRD、SEM、TEM、光电流测试、光降解罗丹明B和磁性回收实验对样品性能进行表征。SEM和TEM图片显示,光催化剂样品具有大的比表面积,复合纳米粒子粒径大小约为85nm。电化学和光催化实验结果表明,ZnFe_(2)O_(4)-ZnO-Pt光电流密度和光催化效率高于ZnFe_(2)O_(4)-ZnO,证明Pt、ZnO、ZnFe_(2)O_(4)三者复合,有利于电子空穴对的分离。且ZnFe_(2)O_(4)-ZnO-Pt光催化剂在多次光降解实验回收利用后性能仍然很稳定,具有高的光催化降解活性,进一步证明ZnFe_(2)O_(4)-ZnO-Pt具有良好的实际应用价值。

Magnetically separable ZnFe_(2)O_(4)-ZnO-Pt nanosized photocatalysts were prepared by impregnation,calcination and reduction processes.XRD,SEM,TEM,photocurrent test,photodegradation of rhodamine B and magnetic recovery experiments were used to characterize the sample properties.SEM and TEM images showed that the photocatalyst sample had a large specific surface area and the composite nanoparticles had a particle size of about 85nm.Electrochemical and photocatalytic experiments show that the photocurrent density and photocatalytic efficiency of ZnFe_(2)O_(4)-ZnO-Pt are higher than those of ZnFe_(2)O_(4)-ZnO,which proves that the composite of Pt,ZnO and ZnFe_(2)O_(4)is beneficial to the separation of electron-hole pairs.The ZnFe_(2)O_(4)-ZnO-Pt photocatalyst is still stable after multiple photodegradation experiments and has high photocatalytic degradation activity,which further proves that ZnFe_(2)O_(4)-ZnO-Pt has good practical application value.