Preparation of a Copper Ion Selective Membrane by Surface-Modified Molecular Imprinting

Abstract

A novel copper ion-selective membrane was prepared by pressure-driven depositing poly(ethyleneimine) (PEI) onto the surface of a polyacrylonitrile (PAN) ultrafiltration (UF) membrane and was subsequently modified with molecular imprinting technique. Examination by infrared spectroscopy and scanning electron microscopy (SEM) confirmed PEI was successfully introduced onto the surface of a hydrolyzed PAN UF membrane. The increase of the pH of copper ion solution was beneficial to the template ion adsorption on the PEI deposited PAN (PEI-PAN) membrane. In ion imprinting, with the cross-linking time prolonged, the adsorption selectivity of the ion imprinted membrane (IIM) increased. The results of binding experiment fitted well with the Langmuir model and showed that the Cu2+ imprinted membrane has the ability of specificity and recognition toward the imprinted copper ion. The imprinting factor calculated from the separation factor was 2.25, indicating that the surface imprinting process facilitated the perm-selectivity of the membrane.

Selective transport of Fe(III) using ionic imprinted polymer (IIP) membrane particle

“…This study was driven by the environmental concerns and the decrease of natural resources. With site-specific receptors incorporated into imprinted membrane, the membrane will then have specific transport or penetration routes, pores or matrices through only the desired ions will be able to pass [2].…”

Imprinting of metal receptors into multilayer polyelectrolyte films: fabrication and applications in marine antifouling

“…Using this approach we assume a homogeneous distribution of binding sites with equal energy across the film and that the guest diffusion through the thin film is fast and is not the limiting step. 36 , 41 , 75 Learning from initial experiments in solution we also know that both films are interacting with metal ions utilizing predominantly receptors composed of two histidine groups per binding site. In the case of the film affinity this simplifies binding to a 1 : 1 type of interaction but with stoichiometry of two histidine moieties per Cu 2+ .…”

“… 38 , 39 Finally, the direct imprinting of metals into a polyelectrolyte film by the immobilization of metal templated receptors was demonstrated only for a single PEI layer (non LbL) using an epichlorohydrin crosslinker. 40 , 41 However a single polymer layer is inferior compared to LbL coatings in terms of substrate coverage and the number of receptors available. Reported systems used also rather poorly coordinating PEI receptors.…”

Preparation of composite‐imprinted alumina membrane for effective separation of p‐hydroxybenzonic acid from its isomer using Box–Behnken design–based statistical modeling

“…MIPs have been used as sensors for detection of various compounds in selective recognition studies, chiral separations, as antibodies and receptors mimics, and enzyme catalysis . Recently, the challenge of involving the molecular imprinting technique in the membrane preparation process has attracted the attention of numerous researchers because it created an innovative way in molecular separations and represented a strong and cheap alternative to traditional membrane separation methods …”

“…13 Recently, the challenge of involving the molecular imprinting technique in the membrane preparation process has attracted the attention of numerous researchers because it created an innovative way in molecular separations and represented a strong and cheap alternative to traditional membrane separation methods. [14][15][16] The hydrogen bond-based molecular imprinting technology has been widely used for the preparation of MIPs through polymerization of V C 2014 Wiley Periodicals, Inc. functional monomers. 17,18 For this method, excessive templates have to be used so to increase recognition cavities in the MIP matrixes.…”