Synthesis And Application Of Magnetic Nanocomposites

Because of their unique properties,magnetic nanomaterials have a good application in magnetic storage,magnetic adsorbents,magnetic fluids and so on.The magnetic material combined other excellent materials greatly expand the application of magnetic nanomaterials,which can be widely used in energy,information,microelectronics,catalysis and other fields.In this paper,graphene oxide,molybdenum disulfide and nanocomposites with iron tetrachloride were successfully synthesized,and their structural characterization and properties were successfully studied.And organic pollutants,which are difficult to remove the in the environmental pollutants,were adsorbed and separated and achieved good results.1.Graphene oxide was synthesized by using the traditional Hummer method,which was modified.Flaky grapheme was obtained by ultrasonic stripping.The structure and properties of graphene were characterized.With the cationic dye rhodamine B as the adsorption model,the graphene oxide was the solid adsorbent to realize the separation of organic dyes.In 20 minutes,absorption efficiency was 90%.From the research results,it proved that the graphene had good adsorption capacity for organic pollutants.2.The Fe₃O₄/RGO nanocomposites were synthesized by modified coprecipitation method.The structures of Fe₃O₄/RGO were analyzed by SEM,FTIR and XRD.The results show that the magnetic iron oxide nanoparticles were cubic and were a spherical shape.While the graphene oxide was a layered structure,a large number of oxygen-containing groups were distributed in its surface and the edge.Fe₃O₄/RGO composites were used as solid catalysts to catalyze the degradation of rhodamine B by potassium persulfate.The catalytic time was 20 minutes and catalytic efficiency was 25%.The addition of solid catalyst increased the reaction rate and reduced the time required for the reaction.And the catalyst can be separated by an external magnetic field to improve the efficiency of separation.3.MoS₂ nanosheets were synthesized by liquid phase separation method.Fe₃O₄/MoS₂ nanocomposites were synthesized by modified coprecipitation method.The characterization methods were SEM,FTIR,XRD.The magnetic iron oxide nanoparticles were cubic structure and the shape were spherical.MoS₂ was thin layer structure and had the larger surface area.The edge and the surface were defective.With the methyl orange as the research model,the adsorption capacity of Fe₃O₄/MoS₂ composites to organic pollutants was studied.The results showed that the magnetic composites exhibited good adsorption capacity to methyl orange.Removal efficiency was 35% and balance time was 5 minutes.Solid-liquid separation could be achieved by applying external magnetic field,which improved the efficiency of separation..