As a new type of catalyst with recycling properties,magnetic nanocomposites have attracted considerable attention in the field of environmental science.In this work,magnetic nano-ZnFe2O4/Ag3PO4 composites were synthesized by hydrothermal method.The synthesized nanocomposites were characterized by X-ray diffraction(XRD),UV-vis diffuse reflectance spectroscopy(UV-vis DRS)and scanning electron microscopy(SEM).Meanwhile,the catalytic performance of ZnFe2O4/Ag3PO4 composites was investigated for the degradation of methylene blue under visible light.The photocatalytic degradation results indicated that the degradation ability of the composite for methylene blue was strongly affected by the molar ratio of ZnFe2O4 to Ag3PO4.When the molar ratio of ZnFe2O4 to Ag3PO4 was 0.1∶1,the photocatalytic activity of the composite was the highest.After 4 cycles,the recovery rate of ZnFe2O4/Ag3PO4 was 93.1%,and the degradation rate of methylene blue was 54.5%at 60 minutes,the recovery rate decreased by 5.1%,and the degradation rate of methylene blue decreased by 8.1%.In contrast,those of Ag3PO4 decreased by 50.2%and 28.7%,respectively.It indicated that the addition of ZnFe2O4 improved the stability and magnetic recovery properties of the composite.Furthermore,the free radical trapping experiment showed that holes(h+)and superoxide radicals(·O2-)were the main oxidative species in the degradation reaction of methylene blue.
NETL
NSTL
万方数据
