Preparation Of Functional Magnetic Graphene Preparation And Study Of Adsorption Performance

In this paper, we used the graphene oxide as substrate, and then modified them with functional materials to prepare new adsorbent with the characteristics of stable performance, excellent adsorption performance and easy separation. The paper includes five sections.Magnetic mesoporous titanium dioxide-graphene oxide(Fe3O4@mTiO2@GO) with large surface area and good magnetic responsiveness was synthesized by immobilizing a mesoporous titanium dioxide(mTi O2) shell on the surface of magnetic Fe3O4 nanoparticles prior to binding with graphene oxide(GO). It showed a tunable pore structure and surface properties, and mechanically strong. The characteristic results of Fourier transform infrared spectrometer(FTIR), scanning electron microscope(SEM), vibrating sample magnetometer(VSM) and X-ray diffraction(XRD) indicated that Fe3O4@mTiO2@GO was prepared. They were used as adsorbent for the removal of Congo Red(CR) from simulated wastewater with a fast solid-liquid separation in the presence of external magnetic field. Moreover, the Fe3O4@mTiO2@GO could be repeatedly used via simple treatment without obvious structure and performance degradation. The equilibrium adsorptions were well-described by the Freundlich isotherm mode. The Fe3O4@mTiO2@GO may be suitable materials in CR pollution cleanup if it was synthesized in large scale and at low price in near future.Magnetic chitosan and graphene oxide-ionic liquid(MCGO-IL) composites as biodegradable biosorbents were synthesized by impregnating MCGO with ionic liquid. The characteristic results indicated that MCGO-IL were successfully prepared with large surface area and good magnetic responsiveness. They were used for the removal of Cr(VI) from simulated wastewater with a fast solid-liquid separation. The effect of various analytical parameters on the adsorption of Cr(VI) such as pH, contact time, and initial ion concentration were studied in detail. The maximum adsorption capacity was 145.35 mg·g-1. The stronger intermolecular hydrogen bond between MCGO-IL and Cr(VI) and the hydroxyl and amine groups were believed to be the metal ion binding sites. Moreover, the MCGO-IL could be repeatedly used by simple treatment without obvious structure and performance degradation. The obtained results indicated that the impregnation of the room temperature IL significantly enhances the removal efficiency of Cr(VI). The MCGO-IL may be suitable materials in heavy metal ion pollution cleanup if they were synthesized in large scale and at low price in near future.The hydroxy-functionalized ionic liquids(ILs) modified with magnetic chitosan/grapheneoxide(MG-ILs-OH) were synthesized. The surface morphology of MG-ILs-OH was characterized by Fourier transform infrared spectroscopy and TEM techniques. The MG-ILs-OH was used as sorbents for the removal of methylene blue(MB). It was found that the MG-ILs-OH could be repeatedly used by simple treatment. The MG-ILs-OH compared with magnetic chitosan/grapheme oxide in the adsorption of methylene blue, it can be see that ionic liquids modified the graphene oxide has high adsorption performance. The results showed that the addition of ILs-OH can largely increase the adsorption sites(hydroxy and amino groups) and adsorption properties. The application of MG-ILs-OH could effectively solve the problem that the adsorbent only adsorb similar adsorbate.The magnetic carboxymethyl chitosan/zirconia(Fe3O4-CMCs-ZrO2) materials were synthesized by modified the chitosan(Cs) and then combined with ferroferric oxide(Fe3O4) and zirconia(ZrO2). Using advanced characterization methods for the characterization to prove the successful synthesised of target materials. Through the adsorption of hydroquinone study showed that the best adsorption conditions temperature of hydroquinone is 40 ?C, the pH is 2.0 and the Qmax is 319.15 mg·g-1, the experimental results were satisfactory.The synthesis of magnetic ferroferric oxide by a convenient method, and then combined tetrabutyl titanate and ferroferric oxide to prepare magnetic titanium dioxide, and then crosslinked chitosan and magnetic titanium dioxide to prepare magnetic titanium dioxide chitosan composite materials. Using infrared spectroscopy(IR) and scanning electron microscopy(SEM) to analysis its structure and appearance, and studied its adsorption and degradation mechanism of dyes. The study on the adsorption of sunset yellow showd the adsorption equilibrium time is 40 minutes with highly adsorption speed. The maximum adsorption capacity of sunset yellow was achieve 325 mg·g-1, and it was can be easy to be separated by magnets.