P(St-co-MMA)微球表面包覆磁性氧化石墨烯的制备与表征

Preparation and Characterization of P(St-co-MMA)Microspheres Surface-Coated Magnetic Graphene Oxide

以单分散的苯乙烯-甲基丙烯酸甲酯共聚物(P(St-co-MMA))微球为载体,FeSO_4·7H_2O和FeCl_3·6H_2O为铁源,NaOH为沉淀剂,在氧化石墨烯(GO)存在下,利用反相共沉淀法通过原位复合技术在P(St-co-MMA)微球表面包覆磁性氧化石墨烯(P(St-co-MMA)/Fe_3O_4/GO)。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、振动样品磁强计(VSM)和氮吸附-脱附等温线对P(St-co-MMA)/Fe_3O_4/GO样品的结构和性能进行表征分析。研究结果表明:纳米级的磁性氧化石墨烯成功地负载在了微米级的共聚物P(St-co-MMA)表面,所制备的P(St-co-MMA)/Fe_3O_4/GO微纳米复合物平均孔径为14.55nm,孔体积为0.204 2cm^3/g,比表面积为56.14m^2/g。该复合物具有超顺磁性和良好的磁响应性,能够满足磁分离的要求。

P（St-co-MMA）microspheres surface-coated magnetic graphene oxide（P（St-co-MMA）/Fe3O4/GO）were synthesized by an inverse coprecipitation in-situ compound technology using monodispersed P（St-co-MMA）microspheres as carriers,FeCl3·6H2O and FeSO4·7H2O as precursors,NaOH as precipitant in the presence of GO.The morphology,crystal structure,chemical structure,BrunauerEmmett-Teller（BET）specific surface area and magnetic properties of the P（St-co-MMA）/ Fe3O4/GO composites were characterized by Scanning Electron Microscopy（SEM）,Transmission Electron Microscopy（TEM）,X-ray powder diffractometer（XRD）,Fourier Transform Infrared spectroscopy（FTIR）,nitrogen adsorption-desorption isotherms and Vibrating Sample Magnetometer（VSM）.Results showed that the nano-size magnetic graphene oxide was successfully coated on the surface of the microsized P（St-co-MMA）copolymers.The average pore width,the volume of pores and the BET specific surface area of P（St-co-MMA）/Fe3O4/GO were 14.55 nm,0.204 2cm^3/g and 56.14m^2/g,respectively.The P（Stco-MMA）/Fe3O4/GO micro-nano composites were superparamagnetic and had good magnetic responsibility,which could meet the demand of magnetic separation.