Adsorption characteristics of Cr(III) ionic imprinting polyamine on silica gel surface

In this paper, a kind of ionic imprinting polyamine (IIP) was prepared through an advanced approach. Firstly, functional macromolecule polyethyleneimine (PEI) was grafted onto the surfaces of silica gel particles, and the PEI/SiO2 was formed. Secondly, the ionic imprinting process was carried out using Cr3+ ion as a template, and epichlorohydrin (ECH) as a crosslinking agent, and Cr3+ ionic imprinting polyamine IIP-PEI/SiO2 was prepared. The adsorption properties of IIP-PEI/SiO2 for Cr3+ ion were studied in details by adopting both static and dynamic methods, and the effects of main imprinting conditions, such as the concentrations of Cr(III) ion and the amount of ECH, on the adsorption property of the imprinted material IIP-PEI/SiO2 were examined. The experimental results show that the IIP-PEI/SiO2 has high affinity and excellent selectivity for the template ion. Its adsorption amounts for template ion enhances nearly two times compared to PEI/SiO2, and its relative selectivity coefficients relative to Zn2+ and Pb2+ are 24.63 and 59.32 respectively. Besides, the IIP-PEI/SiO2 has a fine elution property using HCl solution as eluent.