Preparation and performance of ligand-assisted Ni(Ⅱ)ion-imprinted materials
A series of Ni(Ⅱ)ion-imprinted polymers Ni(Ⅱ)-IIP1-20 and corresponding non-imprinted polymers Ni(Ⅱ)-NIP1-20 were prepared by precipitation polymerization method using Ni(Ⅱ)ion as template ion,o-aminopyridine as ligand,acrylamide as functional monomer,and the systematic optimization of imprinting conditions.The SEM(scanning electron microscopy)and FT-IR(fourier transform infrared)were used to structurally characterize Ni(Ⅱ)-IIP3 and Ni(Ⅱ)-NIP3 prepared under the preferred conditions,and their adsorption behaviors were further explored by kinetic adsorption experiments and isothermal adsorption experiments.The results show that the equilibrium adsorption of Ni(Ⅱ)-IIP3 on Ni(Ⅱ)ions reaches 109.48 mg/g with an imprinting factor of 3.70,which is a typical mesoporous material.The specific imprinted pores for adsorption of Ni(Ⅱ)ions exist on its surface,and the adsorption behavior is more in line with the quasi-secondary kinetic model and the Freundlich isothermal adsorption model.In addition,in the presence of"competing ions"Co(Ⅱ)ions,Ni(Ⅱ)-IIP3 still has strong adsorption capacity and good adsorption selectivity for Ni(Ⅱ)ions,which is a new type of adsorbent material with excellent performance.
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