Abstract: An anion-imprinted material with high performance for recognizing chromate anions was prepared by adopting the novel surface-molecular imprinting technique put forward by our research group previously. Functional macromolecule polyethyleneimine (PEI) was first grafted on the surfaces of micron-sized silica gel particles in the manner of "grafting to", forming the grafted particle PEI/SiO_2. Afterwards, the ion imprinting was carried out towards the macromolecule PEI grafted on the surface of silica gel particles by using ion as template and ethylene glycol diglycidyl ether (EGGE) as crosslinking agent, and chromate ion-surface imprinted material IIP-PEI/SiO₂ was obtained. The binding characteristic of IIP-PEI/SiO₂ for ion was studied with both static and dynamic methods. The experimental results show that IIP-PEI/SiO₂ has excellent binding affinity and high recognition selectivity for chromate anion. Before imprinting, the grafted particles PEI/SiO₂ have similar adsorption capacities for both chromate anion and phosphate anion that was used as a contrast substance. However, after imprinting, the binding capacities of IIP-PEI/SiO₂ towards phosphate anion decrease remarkably, whereas the binding capacity of IIP-PEI/SiO₂ for chromate anion still remains higher, leading to a very high selectivity coefficient (12.23) of IIP-PEI/SiO₂ for ion with respect of ion. IIP-PEI/SiO₂ is a separation material with high performance
Template and target information: Chromate anion
Author keywords: chromate anion, graft polymerization, ion recognition, polyethyleneimine, Surface imprinting technique

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