磁性ZnO/CoFe_(2)O_(4)复合材料的制备及其光催化性能

Preparation and photocatalytic properties of magnetic ZnO/CoFe_(2)O_(4) composites

为了解决纳米光催化材料在使用后难以回收的问题,采用低温煅烧法制备了磁性ZnO/CoFe_(2)O_(4)复合材料。通过扫描电镜、X射线衍射、红外及紫外-可见漫反射等方法对材料进行了表征,并探讨了ZnO和CoFe_(2)O_(4)不同复合比对材料光催化活性的影响。结果表明,当ZnO与CoFe_(2)O_(4)复合质量比为12∶1时,所得材料的光催化活性最好;在500W氙灯照射下,其对甲基橙的光催化降解活性优于商业P25。光催化捕获实验表明,·OH是降解过程中的最主要活性物种,在重复使用5次后仍有较高的光催化活性,且易于在外部磁场作用下分离回收。

In order to solve the problem that nanometer photocatalytic materials were difficult to be recycled after use,magnetic ZnO/CoFe_(2)O_(4) composites were prepared by low temperature calcination method.The materials were characterized by scanning electron microscopy,X-ray diffraction,infrared and UV-Visible diffuse reflection etc.The effects of different composite ratios of ZnO and CoFe_(2)O_(4) on the photocatalytic activity of the materials were investigated.The results showed that the material had the best photocatalytic activity when the mass ratio of ZnO to CoFe_(2)O_(4) was 12∶1.Its photocatalytic degradation activity for methyl orange was better than that of commercial P25 under the irradiation of 500W xenon lamp.Photocatalytic capture experiments indicated that·OH was the most dominant active species in the degradation process.The material still had high photocatalytic activity after 5 repeated uses,and was easy to be separated and recycled under the action of an external magnetic field.