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Preparation And Adsorption Studies Of Magnetic Chelating Resin-PGMA/nano Fe3O4 By Chemical Modification With The Heterocyclic Containing N Ligand

Posted on:2008-02-29Degree:DoctorType:Dissertation
Country:ChinaCandidate:J H XuFull Text:PDF
GTID:1101360242473082Subject:Materials science
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Magnetic micro-particles are a kind of novel functional materials,which have core-shell structure.The magnetite(include Fe3O4,γ-Fe2O3,NiO,etc.)is always taken as core and that of polymer as shell.Magnetic Polymer has both properties of magnetic materials and of polymer materials.Magnetic Polymer can be directly coupled with a lot of biological active materials like enzyme,cell,antibody,drugs and polymers because the shell is polymers which has abundance functional groups such as—OH,—COOH,—NH2 and --CHO or is easy to be modified to meet various requirements.The core is magnetic material and makes the magnetic polymer separated quickly and easily from mixtures by exterior magnetic field.Heretofore, magnetic polymer has exhibited extensive applications to biomedicine(for example, carrier of enzyme,separation of cells and antibody,target delivery of drug,contrast enhancement in magnetic resonance etc.),bioengineer and materials.It has aroused extensive scientific and technological interest in lately 20 years.The main content and conclusions of this paper is summarized as following;(1)Preparation and surface modification of nano-Fe3O4;A kind of oleic acid-coating magnetic nanoparticles were prepared with a modified chemical co-precipitation process.The properties of nano-Fe3O4 were characterized by X-ray diffractometry(XRD),Nano Sizer Series,Vibrating sample magnetometer(VSM)and Fourier transform infrared spectroscopy(FTIR).X-ray diffraction measurements indicate the nanoparticles were pure Fe3O4 which have more completely structure.The magnetic Fe3O4 have nano size and the average size is 28 nm by calculation.The results of Zetasizer nano series show that the average size of nanoparticles is 835nm(polydispersity index 0.398).Vibrating sample magnetometer (VSM)indicates that the magnetic nanoparticles are superaramagnetic and the saturation magnetization is 44.6 emu/g.The structure of oleic acid-coating magnetic nanoparticles was proved by Fourier transform infrared spectroscopy(FTIR).(2)Dispersion polymerization,chemical modification and properties study of glycidyl methacrylate; Polyglycidyl methacrylate(PGMA)was prepared by dispersion polymerization and was chemical modified with imidazole,a-aminothiazole,3-amino-1,2,3-triazole, 5-amino-1,2,3,4-tetrazole,and PEI to introduce functional groups.The particle size, size distribution,and surface morphology of the particles were observed by scanning electron microscopy(SEM)and the composition of the polymer particles was recorded by Fourier transform infrared spectroscopy(FTIR).The SEM showed the average diameter of polymers was5 5μ.Fourier transform infrared spectroscopy (FTIR)confirmed the structure of PGMA and existence of functional groups.(3)Preparation,chemical modification and properties study of magnetic glycidyl methacrylate;The aim of this paper is to synthesize a kind of chelating resin,which has a high content of magnet and appropriate surface functional groups.The resin would be used in recovering metal and sewage treatment.Dispersion polymerization was used to synthesize superparamaginetic micron-sized polyglycidyl methacrylate(PGMA)-based latex particles.The resulted particles were chemical modified with imidazole (3-amino-1,2,3-triazole,5-amino-1,2,3,4-tetrazole,a-aminothiazole,PEI)to yield functional groups.The structure,diameter and magnetic performance of the product were also characterized.The diameter of the magnetic chelating resin was 4~8μwhich was measured by SEM.The polymer was coated on the magnet well,which was provedby TEM.The existence of functional groups was proved by FTIR.The magnet content of the chelating resin was more than 30%.The saturation magnetization of chelating resins is more than 4.54emu/g and indicates that the magnetic nanoparticles are superaramagnetic.(4)Adsorption property;The adsorption properties of chelating resin and magnetic chelating resin on metal ions was also investigated.Using the static adsorption,the capacities of the magnetic chelating resins which have different functional groups on Hg2+,Cd2+,Cu2+,Pb2+,Zn2+,Mg2+,Co2+were investigated and compared with those of non-magnetic chelating resins respectively.The chelating resins which have different functional groups have a good adsorption on Cu2+but different on other ions.
Keywords/Search Tags:nano-Fe3O4, chemical co-precipitation, superaramagnetic, dispersion polymerization, chemical modification, chelating resin, adsorption properties
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