Preparation of Magnetic Imprinted Core-Shell Particles Through Reverse Atom Transfer Radical Precipitation Polymerization for Selective Removal of Sulfamethazine

摘要

In the present work, we reported an effective and simple method for the preparation of magnetic molecularly imprinted particles (MMIPs) through reverse atom transfer radical precipitation polymerization at the surface of magnetic nanoparticels, and the as-prepared MMIPs were then evaluated as nanoadsorbents for the selective recognition and rapid removal of sulfamethazine (SMZ) molecules from aqueous medium. MMIPs were developed in acetonitrile, coated the ethylene glycol dimethacrylate polymers layer with the aid of functional monomer 4-vinyl pyridine to form the complex with SMZ. MMIPs were characterized by X-ray diffraction, fourier transform infrared analysis, vibrating sample magnetometer, transmission electron microscopy and scanning electron microscope. MMIPs were demonstrated with a narrow diameter distribution (with the imprinted nanoshell of 15 nm), and exhibited magnetic property which made it easily to be collected from solutions. Batch mode adsorption studies were carried out to investigate the specific binding capacity, binding kinetics and recognition specificity. The Langmuir isotherm model was fitted to the equilibrium data better than the other models, and the monolayer adsorption capacity of MMIPs were 40.0 mu mol g(-1) at 298 K. The dynamic property of MMIPs (within 45 min) was well described by pseudo-second-order kinetic equation. The selective recognition experiments demonstrated high affinity and selectivity towards SMZ over structurally related antibiotics. Also, the MMIPs exhibited good regeneration property.