Abstract:A graphene oxide coated magnetic nano-composite has been prepared, accompanied by a characteristic analysis of the compound material by X-ray diffraction, scanning / transmission electron microscopy, Fourier transform infrared spectroscopy and vibrating sample magnetometer. The results show that the composite material is characterized with a core-shell structure of Fe3O4 core and graphene oxide shell, with the wrinkled graphene oxide in the composite closely connected to magnetic nanoparticles, and Fe3O4 monocrystal. The composite is prepared by an initial coating of SiO2 on the surface of spherical Fe3O4 nanoparticles, followed by an addition of -NH2 group on the surface of the coating, with a final a reaction of graphene oxide to obtain the composite with core-shell structure. A preliminary simulation test is to be carried out of the adsorption properties of the composites, followed by an investigation of the effects of solution pH, adsorption dose on adsorption capacity and adsorption isotherm using methylene blue as an adsorbent. The results show that the composite material can be quickly separated under external magnetic field after adsorption, making it an excellent adsorbent.