Study On The Preparation And Adsorption Properties Of Ferroferric Oxide Composite

Fe₃O₄materials have been widely used in many fields due to their excellent magnetic properties,and the research on their surface functional modification is also constantly developing.After research,among inorganic materials,carbon materials and silicon oxide have been used to modify magnetic materials.If mesoporous silica(mSiO₂)is wrapped in the outer layer of Fe₃O₄,its dense structure can protect Fe₃O₄particles,and its loose and porous structure can greatly improve its adsorption effect.The carbon material coated Fe₃O₄particles can effectively improve its stability and adsorption capacity.In this paper,solvothermal method was used to prepare ferroferric oxide particles,and their surfaces were functionalized with mesoporous silica and glucose to obtain Fe₃O₄@mSiO₂and Fe₃O₄@C magnetic particles were used to perform adsorption.The main content of this article is as follows:(1)FeCl₃was used as the iron source,combined with the improved St(?)ber method to synthesize Fe₃O₄@mSiO₂magnetic particles,and the products were characterized by SEM,XRD,VSM,and FTIR.Fe₃O₄@mSiO₂magnetic particles were used to adsorb MB in aqueous solution under different conditions.The study found that the optimal p H value of Fe₃O₄@mSiO₂nanoparticles for MB adsorption is 10.The time for Fe₃O₄@mSiO₂particles to reach adsorption equilibrium is 30 minutes.The fitting results show that the adsorption process is similar with the quasi-second-order kinetic model and the Langmuir adsorption isotherm model.The maximum adsorption capacity of Fe₃O₄@mSiO₂particles for MB is 34.33mg/g.After four adsorption-desorption cycle experiments,the adsorption capacity of Fe₃O₄@mSiO₂particles on MB can still reach more than 71%.This test fully shows that Fe₃O₄@mSiO₂particles have good recyclability and high repetitive use rate.MB dye wastewater treatment has good application value.(2)Fe₃O₄@C particles are synthesized by solvothermal method using Fe₃O₄@C particles as raw materials and adding glucose.The thickness of the outer carbon layer of the sample is changed by changing the reaction time.The product was characterized by SEM,XRD,VSM,FTIR.The Fe₃O₄@C composite particles synthesized in this paper still show better magnetic response even when the carbon layer is the thickest,and the carbon shell layer not only makes the Fe₃O₄core not easy to be oxidized,but also makes the composite particles more uniformly dispersed.At the same time,the carbon coating layer on the surface of Fe₃O₄@C composite particles has a variety of functional groups,which greatly improves its compatibility with organisms.Under different conditions,Fe₃O₄@C magnetic particles were used to adsorb MB in aqueous solution,and conclusions were drawn.Studies have shown that the adsorption equilibrium time of Fe₃O₄@C magnetic particles to MB is 30 minutes,the optimal p H value of the adsorption environment is 10,and the thickness of the carbon layer of Fe₃O₄@C particles has a great influence on the adsorption capacity.The thicker the thickness,the stronger the adsorption capacity.This reason may be the increase in the thickness of the carbon layer.The isotherm fitting results show that the adsorption process is similar with the Langmuir adsorption isotherm model.The maximum adsorption capacity of Fe₃O₄@C particles is 61.77mg/g.After research,electrostatic interaction is the main factor of adsorption during the adsorption process.The adsorption capacity of Fe₃O₄@C particles to MB can still reach 88%of the previous maximum after four cycles of experiments,indicating that Fe₃O₄@C particles have good recyclability and high reusability.It has good application value in processing.