A Study on Preferential Adsorption of 2,4,5-Trichlorophenol by an Imprinted Polymer on the Surface of a (Chitosan/maghemite)@C Magnetic Composite
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Abstract:
A carbon-based magnetic carbon sphere of (chitosan/maghemite)@C was synthesized by emulsion polymerization, and vinyl groups were introduced into its surface. The imprinted polymer on the magnetic carbon sphere surface was prepared using 2,4,5-trichlorophenol (TCP) as a template molecule, methacrylic acid (MAA) as a functional monomer, and ethylene glycol dimethylacrylate (EGDMA) as the cross-linker. The morphology, structure, and other physicochemical properties of the formed material were characterized by means of a scanning electron microscope (SEM), ultraviolet (UV) spectrophotometer, vibration sample magnetometer (VSM), and thermogravimetric analyzer (TGA). Thermostability and magnetic stability of the material were studied, and the adsorption performance and selectivity of the material as an adsorbent for 2,4,5-TCP were investigated. The results indicated that saturation magnetization values of the magnetic carbon sphere and magnetic carbon sphere surface imprinted polymers (MMIPs) were 4.3 and 1.7 emu/g, respectively. The equilibrium adsorption data conformed to the Freundlich isotherm model, equilibrium adsorption capacity was ~200 mg/g, and the kinetics followed a second-order kinetic equation. The adsorption equilibrium time was approximately ten minutes, and the imprinted sorbent showed optimal adsorption on the template molecule, with significant specific adsorption.
