Preparation And Photocatalytic Activity Of Fe₃O₄/BiOI Magneto-optical Bifunctional Catalyst

The semiconductor photocatalytic treatment technology as a new kind of wastewater treatment technology,is developed rapidly in recent years.Compared with the traditional methods,it has the use of clean energy,low energy consumption,stable and harmless and no two pollution characteristics,which has been recognized as one of the most potential water pollution treatment method.In this paper,the pure BiOI was synthesized by the method of hydro thermal and solvent thermal and magnetic response photocatalytic Fe₃O₄/BiOI nanoparticles were prepared by a method of solvothermal reaction.The instrument of XRD,SEM,TEM,EDS and STEM-EDS were used to characterize the structure and morphology of the synthesized samples,respectively methyl orange,The degradation of synthesized samples for the catalytic degradation ability of organic dyes was estimated from methyl orange and methylene blue irradiation with visible light.The results showed that the size of the solvothermal synthesis sample was smaller than hydrothermal method and the crystal surface spacingwas only 0.28 nm.Under visible light irradiation,samples of solvothermal synthesis of methyl orange?MO?aqueous is completely degraded.in 80 min.EDS energy spectrum analysis showed that the synthesized samples were composed of the four elements,Fe,O,Bi and Iand there was no impurity formation.The analysis of the selected element energy spectrum?STEM-EDS?showed that,under the condition of160 ?,Fe₃O₄/BiOI composite nanoparticles had a core/shell structure which was spherical,uniform and uniform.Under the condition of room temperature,the saturation magnetization of the samples was 46.89 emu/g.Under the irradiation of visible light,the methylene blue?MB?could make degradation rate reach 98.3% with the synthesis of Fe₃O₄/ BiOI magnetic nanophotocatalyst synthesized at 160?,in 40 min.Under the condition of keeping the same experimental conditions,methylene blue was used as the target degradation material and the recovery effect of methylene blue could be more than 5 times with the recovery of the magnetic nanophotocatalyst which was reused for more than 90%.The results show that the catalytic degradation of the catalyst is stable and could meet the requirements of recycling and reuse.