Preparation And Properties Of Nano Spinel Ferrite-Graphene Composites

In this paper,nano spinel ferrite-graphene composites with different graphene contents were prepared by solvothermal method.It was expected to achieve synergistic effects on both photocatalytic activity and capacitance characteristics,and the excellent performance of multi-functional materials were prepared successfully.In this paper,the phase structure and microstructure of nano spinel ferrite-graphene composites were characterized,and the major research was the performance of photocatalytic degradation dye wastewater and the electrochemical performance as supercapacitor electrode materials.（1）Spinel Zn ferrite,spinel Ni ferrite,spinel Mn ferrite and spinel Cu ferrite were prepared by solvothermal method at different reaction temperatures.The results showed that the prepared products were spinel ferrite at 200℃.The particle size of the three ferrite（Zn,Ni,Mn）is in the range of 6-10 nm,and the particle size of the copper ferrite is in the range of200-250 nm.（2）The graphene oxide was prepared by modified Hummers method.The spinel ferrite-graphene composites（10%,15%,20%,25%,30%）with different graphene content were prepared by solvothermal method,and the nano ferrite particles were attached to the graphene layer uniformly.（3）The RhB adsorption performance of the above sample were researched respectively.The results showed that the RhB adsorption capacity reached maximum,and the RhB adsorption capacity of ferrite-graphene composites were higher than single ferrite obviously.（4）The photodegradation of RhB properties about the above sample were studied respectively.The results showed that the degradation effect of four single spinel ferrite is almost negligible for RhB in visible light.The process of photocatalytic degradation of RhB by Zn ferrite-graphene composites,Mn ferrite-graphene composites and Cu ferrite-graphene composites requires the addition of H₂O₂ to achieve dual photocatalytic effects.ZF3-25% rGO,MF3-25% rGO,CF3-25% rGO have the best photocatalytic activity in the composites,and the degradation rates of RhB were90.2%,99.2% and 96.8% respectively when light time was 90 min.The photocatalytic activity of Ni ferrite-graphene composites for rhodamine B was higher than the above three kinds of composites,and the photocatalytic process without H₂O₂.NF3-20% rGO have the best photocatalytic activity in the composites,and the degradation rates of RhB was 93.7% when light time was 160 min.（5）The electrochemical performance of the above sample were researched respectively.The results showed that the electrochemical performance of ferrite-graphene composites were better than single ferrite obviously.ZF3-20% rGO、NF3-20% rGO、MF3-15% rGO、CF3-20%rGO have the best electrochemical performance in the sample.When the current density is 1A/g,the specific capacitance of the ferrite-graphene composites were 520 F/g,805 F/g,1717.5 F/g,1952.5 F/g respectively,and they possess good charge and discharge cycle stability and magnification performance.Their photocatalytic activity and electrochemical properties were significantly improved.（6）The above results showed that nano spinel ferrite-graphene composites were prepared in this paper and they have complementary advantages in photocatalytic performance and electrochemical performance.