氧化石墨烯包覆磁性纳米粒子复合材料的制备及其对亚甲基蓝的模拟吸附

制备了一种氧化石墨烯包覆磁性纳米粒子复合材料，并运用X射线衍射、扫描/透射电镜、傅里叶红外光谱、振动样品磁强计对该复合材料进行了表征。研究结果表明，该复合材料具有Fe3O4核、氧化石墨烯壳的核壳结构，复合材料中皱纹丝状的氧化石墨烯紧密和磁性纳米粒子相连，Fe3O4成单晶状。该复合材料的制备首先在球形的Fe3O4纳米粒子表面包覆SiO2涂层，再在涂层表面赋予-NH2基，最后和氧化石墨烯反应，最终得到具有核壳结构的复合材料。对复合材料的吸附性能进行了初步模拟测试，以亚甲基蓝为吸附质，对溶液pH值、吸附剂量对吸附量的影响以及吸附等温线进行了研究，结果表明该复合材料能够在吸附后在外加磁场下快速分离，是一种优异的吸附剂。

Preparation of Graphene Oxide Coated Magnetic Nano-Composites with Their Simulated Adsorption of Methylene Blue

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.