Synthesis and evaluation of ion-imprinted composite membranes of Cr(vi) based on β-diketone functional monomers

Abstract

Using Cr(vi) as the imprinted ions and 2-allyl-1,3-diphenyl-1,3-propanedione (a compound of independent design) as the functional monomer, a series of chromium ion-imprinted composite membranes and corresponding non-imprinted composite membranes were synthesized and tested.

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

“…Their selectivity might be additionally improved by the introduction of the ion template species resulting in the high recognition ability of ion imprinted polymers [ 17 , 18 ]. Studies on the synthesis of IIMs and their application for selective adsorption of Cr(III) [ 19 , 20 ] or Cr(VI) [ 21 , 22 ] ions, mostly from water samples, have been reported, but no studies are known about the green synthesis of Cr(III)-IIMs and their application for chromium speciation analysis.…”

Thermo‐responsive ReO4− composite membranes with SiO2 modified: Preparation, performances and application in secondary resources

“…The development of an imprinted composite membrane that is responsive to changes in the external environment is an effective way to solve the above problems 18,19 . For example, Li 20 et al prepared a pH‐responsive chromium (Cr) ion‐imprinted composite membrane based on free radical polymerization, using namely 2‐allyl‐1,3‐diphenylpropane‐1,3‐dione (ADPD) as the pH‐responsive functional monomer. ADPD could switches between ketone and enol in response to variations in the pH of the matrix solution, which could achieve selective separation of Cr (VI) by pH change.…”

“…The results showed that the adsorption and desorption processes of the imprinted polymers could be controlled by changing the solvent type. Traditional ICMs respond to the external environment only by adding responsive monomers in the polymerization process, such as N‐Isopropyl acrylamide (NIPAM), 22 p ‐phenylazoacrylanilide (PhAAAn), 23 2‐allyl‐1,3‐diphenylpropane‐1,3‐dione (ADPD), 20 N,N′‐(ethane‐1,2‐diyl)bis(2‐methylacrylamide) (EBMA), 24 and so on. But the above problem cannot be solved well due to the random copolymerization and the limited movement of responsive monomers in the rigid mesh structure.…”