Study On Adsorption Behavior Of Pollutants By Hyperbranched Structure Magnetic Nanocomposites

The problem of excessive content of heavy metal ions and organic dyes in water and the current pollution incidents,which is seriously threatened human health,and caused great concern of the whole society.And,mainly from the petrochemical,pharmaceutical,printing,metal processing,electroplating,battery and paint and other industrial production processes,most of them have characters of multi-kinds,complex component,harmful to human body and difficult to handle.Recently,there are some researches on removing heavy metal ions and organic dyes,and several technologies have been developed.Adsorption has been considered to be superior to other techniques for decontamination in view of its comparatively low costs,wide range of applications,simplicity of design,easy operation,low harmful secondary products and facile regeneration of the adsorbents.The core of this process technology is to develop suitable adsorbent.As an emerging heavy metal ions and organic dyes adsorption material,magnetic nanocomposite material has been attracting attention more and more,because of high specific surface area,good magnetic effect,large adsorption capacity,fast separation,easy regeneration.In this paper,we proposed a new fast,simple and mild preparation method of magnetic adsorption material,preparation of amino terminated hyperbranched polymer functionalized magnetic nano-composite materials(Fe3O4-HBPA),Fe3O4-HBPA for the fast and highly efficient removal of lead ions and anionic dyes from aqueous solution.Then on the surface of the Fe3O4-HBPA introduction of dithiocarbamate group(CS2),prepared with a broad adsorption properties of magnetic adsorption materials,which can rapid and efficient removal of Hg2+,Cu2+,Cd2+ and Pb2+ in aqueous solution.Design the synthetic route of one-pot method,combining the function of magnetic nanoparticles and graphene oxide,and to study the adsorption of Hg2+ ions.The resulting magnetic nanocomposites materials were characterized by means of Transmission electron microscopy(TEM),Scanning electron microscopy(SEM),Fourier transform infrared spectrometer(FTIR),X-ray diffraction(XRD),vibrating sample magnetomtry(VSM),Thermogravimetric analysis(TGA),nitrogen adsorption desorption(BET)and Zeta potential.The adsorption of heavy metal ions and organic dyes in aqeous solution,which was investigated by static adsorption experiments.The effects of adsorption dose,pH value,contact time,initial concentration,temperature and coexisting ions on the adsorption process were discussed.The adsorption kinetics,thermodynamics and isothermal adsorption model were used to fit the experimental data,and adsorption mechanism was discussed.