Synthesis And Performance Of Three Dimensional Carbonous Magnetic Imprinted Extraction Materials

Carbon nanotubes(CNTs)and graphene(GO)have large specific surface area and unique physicochemical properties.The three-dimensional magnetic carbon-based imprinted polymers was prepared with the supporting materials,and the imprinted polymers not only have great adsorption capacity and specific selectivity,but also possessed the advantages of carbon nanotubes and graphene.In this paper,a series of novel three-dimensional magnetic imprinted polymers was prepared with the carbon-based supporting material.Coupled with high performance liquid chromatography,atomic absorption spectroscopy and solid phase extraction,the synthetic materials were successfully applied to enrich the active constituents from the plant,the Pb(II)and Cd(II)in human serum,and the macromolecule protein.The experimental results show that the imprinted polymers have large adsorption capacity and enrichment ability for template molecules.The contents of this paper are as follows:1.A novel three-dimensional(3D)magnetic chlorogenic acid(CGA)imprinted polymers(MMIPs)was prepared with novel carbon hybrid nanocomposite as the carrier,chlorogenic acid as the template molecule,and methacrylic acid as the functional monomer.The 3D MMIPs were characterized by scanning electron microscope,Fourier transform infrared spectroscope,thermogravimetric analysis and vibrating sample magnetometer,and UV spectrometer in detail.The results showed that the imprinted layer was attached successfully on the surface of 3D magnetic carbon hybrid nanocomposite.The adsorption performance of the 3D MMIPs was investigated and the results showed that the 3D MMIPs exhibited high adsorption capacity and fast adsorption rate toward CGA with a maximum adsorption capacity of 10.88 mg g-1.The extraction conditions involving washing solvent,the pH of eluent solvent,elution volume and desorption time were also investigated in detail.Combined with high performance liquid chromatography,the 3D MMIPs have been applied to extract CGA from the eucommia leaves extract samples successfully.2.A novel three-dimensional(3D)magnetic imprinted polymer was prepared with bovine serum albumin as the template molecule,dopamine as the functional monomer and graphene oxide and carbon nanotubes hybrid 3D nanocomposite as the carrier.The preparation conditions of the 3D magnetic molecularly imprinted polymers were optimized.The 3D magnetic molecularly imprinted polymers were characterized by scanning electron microscope,Fourier-transform infrared spectroscope,and vibrating sample magnetometer in detail.The adsorption results showed that the 3D magnetic molecularly imprinted polymers possessed fast adsorption rate and excellent adsorption performance toward bovine serum albumin with a maximum adsorption capacity of78.12 mg g-1.The imprinted extraction conditions involving washing solvent,the pH of eluent solvent and desorption time were also optimized in detail.Combined with high performance liquid chromatography,the 3D magnetic molecularly imprinted polymerswere successfully applied to enrich and separate bovine serum albumin from the bovine calf serum samples with recoveries of 84.0%-94.5%.3.A new type of three-dimensional(3D)magnetic dual-ion imprinted polymers(MIIPs)was prepared with novel 3D graphene as the carrier,Pb(II)and Cd(II)as the template ions,N-(trimethoxysilylpropyl)ethylenediamine triacetic acid(EDTA–silane)as the chelating agent,and ethylene glycol dimethacrylate(EGDMA)as the cross-linker.The synthesized 3D-MIIPs were characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy.The adsorption performance of the 3D-MIIPs toward Pb(II)and Cd(II)was investigated in detail and the results showed the maximum adsorption capacity of the 3D-MIIPs for Pb(II)and Cd(II)ions was assessed to be162.34 mg g-1 and 145.77 mg g-1,respectively.The kinetic adsorption of Pb(II)and Cd(II)on the 3D-MIIPs follows the pseudo-second-order model.Various extraction conditions such as eluent type,concentration of the eluent,desorption time and the volume of eluent were examined in detail.After five adsorption–desorption cycles,the3D-MIIPs still maintained 92% of the initial adsorption capacity.Finally,combined with atomic absorption spectrometry,the proposed analytical procedure was successfully applied to monitoring trace Pb(II)and Cd(II)ions in human blood samples with satisfactory recoveries(90.0%-94.0%,92.0%-98.0%).