One-pot method fabrication of superparamagnetic sulfonated polystyrene/Fe_3O_4/graphene oxide micro-nano composites

摘要

In this work, using monodispersed sulfonated polystyrene (SPS) microspheres as carriers, FeCl3 center dot 6H(2)O and FeSO4 center dot 7H(2)O as precursors, NaOH as precipitant in the presence of graphene oxide (GO), SPS/Fe3O4/GO micro-nano composites were fabricated by a simple one-pot method employing an inverse coprecipitation in-situ compound technology. The SPS/Fe3O4/GO micro-nano composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffractometer, Fourier transform infrared spectroscopy, nitrogen adsorption/desorption isotherms and vibrating sample magnetometer. The results show that the SPS/Fe3O4/GO micro-nano composites were fabricated with SPS as core, GO and Fe3O4 nanoparticles as shell. The SPS/Fe3O4/GO micro-nano composites had larger BET specific surface area, average pore width and micropore volume than the pure SPS microspheres. Meanwhile, the SPS/Fe3O4/GO micro-nano composites had superparamagnetism and hydrophilic property. The saturation magnetization (M-s) of the SPS/Fe3O4/GO micro-nano composites was 10.86 emu/g, which was enough to ensure the convenient magnetic separation of solid and liquid phase.