Preparation And Adsorption Performance Of New Ion-imprinted Polymers

Magnetic ion imprinted polymer is a kind of new functional polymer material, which can selectively adsorb heavy mental ion. In recent years, more attention has been payed to research and application of magnetic ion imprinted polymers. Two new ion imprinted polymers were prepared with chitosan?CS? and fulvic acid?FA? as the respective functional monomer.1)Fe₃O₄/SiO₂/CS was prepared with Fe₃O₄/SiO₂ as the magnetic core, Ni²⁺as the template and CS as the functional monomer. The structural and performance characterization were analyzed by XRD, IR and TG. When the absorbent dosage of Fe₃O₄/SiO₂/CS was 0.08 g and p H was 6, the adsorption capacity was 2.5 mg/g and the removal rate of Ni²⁺ was 99.8%. Within the scope of the study, the Fe₃O₄/SiO₂/CS adsorption capacity of Ni²⁺ was 4.84 times more than that of the CS-N-IIP and retained 98.2% after five times adsorption tests. Furthermore, the selectivity coefficient of Ni²⁺/Cu²⁺and Ni²⁺/Pb²⁺ were 276.7 and 119.7. The Langmuir isotherm well fitted the experimental results of Fe₃O₄/SiO₂/CS on Ni²⁺. And pseudo-second-order kinetic model can be used to describe the adsorption kinetics well.2) Fe₃O₄/SiO₂/FA was prepared with fulvic acid as the functional monomer, Cu²⁺as the template and Fe₃O₄/SiO₂ as the magnetic core. The structural and performance characterization were analyzed by XRD, IR and TG. When the volume of aqueous solvent was 50 m L, the best preparation conditions were: the dosage of KH-560 was 2.8 m L, the dosage of Cu SO4?0.03 g/m L? was 10 m L, the dosage of FA?0.012 g/m L? was 15 m L, the dosage of Fe₃O₄/SiO₂ was 0.8 g and the reaction temperature was50?.3)Adsorption study of Fe₃O₄/SiO₂/FA was carried out.. When the best absorbent dosage of Fe₃O₄/SiO₂/FA was 0.10 g and p H was 6, the adsorption capacity was 2.5 mg/g and the removal rate of Cu²⁺ was 100%. Within the scope of the study, the Fe₃O₄/SiO₂/FA adsorption capacity of Cu²⁺was 5.13 times more than that of the FA-N-IIP and retained 98.8% after five times adsorption tests. In addition, the selectivity coefficient of Cu²⁺/Ni²⁺ and Cu²⁺/Pb²⁺ were 141.1 and 14.34, respectively.And Cu²⁺ onto Fe₃O₄/SiO₂/FA conforms to Langmuir isotherm and the adsorption kinetics fitted pseudo-first-order and pseudo-second-order kinetic models well.