Preparation Of Magnetic Graphene Oxide Composite Microspheres And Study On Dye Adsorption Performance

As a new type of carbon material,graphene oxide with large specific surface area and a rich functional group has superior performance in improving the electrical,mechanical and thermal properties of the material.The graphene oxide which is further modified by chemical method has potential application in the fields of biological targeted transportation,material separation,and wastewater treatment.Super paramagnetic nanomaterials have a good magnetic response when they are in an external magnetic field,so they could solve the problems of difficult material separation and low recycling rate,and have been studied deeply in drug transport,magnetic resonance imaging and effluent treatment.The composite materials which have magnetic properties,biocompatibility,surface activity,and other excellent properties are synthesized by polymers and magnetic nanomaterials,and have becomed a hot topic in current research.This paper mainly studies two composite materials that is synthesized by graphene oxide,magnetic materials,and copolymerized microgel polymers.The primary contents are as following:(1)NH2-SiO2-P(NIPAM-co-AA)microspheres were synthesized by TEOS and APTES.The activated microspheres combine with graphene oxide to synthesize GO-P(NIPAM-co-AA)composite microspheres.(2)The Fe3O4/P(NIPAM-co-AA)microspheres were obtained by the swelling method.The magnetic microspheres with amino group combine with graphene oxide to obtain GO-Fe3O4/P(NIPAM-co-AA)composite microspheres.(3)The adsorbing MB properties of composite materials were characterized and discussed in aspect of changing the adsorption time,pH and content of graphene oxide.Field Emission Scanning Electron Microscope(FESEM),Vibration Sample Magnetometer(VSM),Thermogravimetric analyzer(TG),Ultraviolet-Visible spectro photometer(UV),Raman spectrometer were used to characterize the structure and properties of composite materials.The results show that the two composites materials have a spherical structure,regular morphology,uniform dispersion,average particle size of about 35?m,and the surface of composites materials was covered with graphene oxide.The composite microspheres containing different amounts of graphene oxide have different adsorption properties to organic dyes.Under different pH conditions,the adsorption of methylene blue by composite microspheres is different.