Synthesis Of Magnetic Graphene Oxide And Research Of Its Absorption Behavior

The extensive use of dye has brought great pollution problem, and it has also become a touch challenge which needed to be solved urgently. With large surface area, graphene oxide(GO) has shown great practical potentiality in water purification. Due to the surface of GO containing several hydrophilic groups, such as: hydroxyl, carboxyl, etc, which makes GO hardly extract from water, this paper design a magnetic GO in order to solve this problem. When dye was absorbed onto GO surface completely, the liquid which was putted into external magnetic field could be easily achieved separation. What’s more, the magnetic GO which was extracted from dye pollutants can come true regeneration and the goal of reusability after washed by alcohol.In this paper, graphite oxide was prepared by employing Hummers method, and then would attain GO after ultrasonic dispersion. At last, Fe3O4 would be loaded onto GO surface by electrostatic self-assembly. The identity of the hybrid materials was confirmed using transmission electron microscopy(TEM), scan electron microscope(SEM), atomic force microscope(AFM), X-ray diffraction(XRD), thermogravimetric analysis(TG/TGA), Fourier transform infrared spectroscopy(FTIR) and a vibrating sample magnetometer(VSM). Simultaneously, the effect of different loading amounts of Fe3O4 onto the graphene oxide was studied by changing the proportion of the initial precursors.In order to study the removal ability of magnetic GO, the research of three dyes(rhodamine B, methylene blue, methyl blue) were absorbed onto the magnetic GO was carried out in this paper. The effect of p H, morphology of Fe3O4, proportion of the initial precursors to removal efficient has been discussed in detail. In addition, groups of experiments were designed to investigate the kinetics and thermodynamics of dyes adsorption onto GO for the purpose of adsorption mechanism research. Eventually, the regeneration ability of magnetic GO was estimated in this paper.The prepared GO had a two-dimensional honeycomb lattice structure, on whose surface there were many folds. The saturation magnetization of prepared magnetic GO could be 40 emu/g, which was strong enough to support the extraction from wastewater. In addition, the adsorption behavior of this new adsorbent fits well with the Freundlich isotherm and the pseudo-second-order kinetic model, which means that the absorption behavior of GO to cationic dye was chemical absorption and monolayer absorption. The result of regeneration research indicated that magnetic GO still had great removal efficient after reuse six times and showed enormous practical potentiality.