Preparation and characterization of Zn(II) ion-imprinted polymer based on salicylic acrylate for recovery of Zn(II) ions

Abstract

SbstractThis work describes the synthesis of new ion-imprinted polymers (IIPs) for selective solid phase extraction of Zn(II) ions from aqueous samples. IIPs were synthesized by copolymerization of salicylic acrylate (SA) as a functional monomer and ethylene glycol dimethacrylate (EGDMA) as a crosslinker in the presence of 2,2'-azobisisobutyronitrile (AIBN) as an initiator. The template ions were removed from IIPs particles by leaching with 0.1 M Ethylenediaminetetraacetic acid (EDTA) which leaves cavities in the particles with the capability of selective extraction of the Zn(II) ions. The monomer and the polymer after synthesis have been characterized by 1 H NMR, 13 C NMR and FT-IR studies. The effect of the pH on the extraction efficiency of Zn(II) ions was studied and optimized in pH around 6. The selectivity of the synthesized IIPs was studied in the presence of Co(II), Cd(II) and Ni(II) ions, and the IIPs showed higher affinity for Zn(II) in the presence of other interfering ions.

Ion-Imprinted Polymeric Materials for Selective Adsorption of Heavy Metal Ions from Aqueous Solution

“…Among the different sorbents used for SPE, IIPs have attracted much attention as selective sorbents for the preconcentration of metal ions. However, reports on the synthesis of the IIP selective for Zn(II) are limited (see Table S1 ) [ 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 ]. For example, 8-HQ has been used to prepare Zn(II)IP for separation and preconcentration of Zn(II) from different matrices prior to its determination, by mixing the binary complex of Zn(II) with 8-HQ, using styrene (ST) as the monomer and EGDMA as the cross-linker followed by thermal polymerization [ 83 ], or MAA as the monomer, EGDMA as the cross-linker and ethanol/acetonitrile mixture as porogen, followed by precipitation polymerization [ 86 ].…”

“…Salicylic acrylate as a chelating ligand has been complexed with Zn(II) and then thermally polymerized with EGDMA [ 87 ]. The chelating property of the salicylate structure is due to the existence of an OH group in the ortho position relative to the carboxyl or carbonyl group that can react with both hard and intermediate cations.…”

“…The prepared Zn(II)-IPs showed an extraction efficiency of Zn(II) much higher for Zn(II) than for the competitor cations. Thus, the extraction efficiency of Zn(II) at pH 6.0 was 94.9%, while for Co(II), Ni(II), and Cd(II), it was 35.5%, 10.5%, and 19.9%, respectively [ 87 ].…”

Determination of optimal adsorption-desorption conditions for selective removal of Ni(II) from petrochemical samples using ion imprinted nanosorbent

“…In this technique, a complex is formed through the assembly of ionic species and especial functional monomer and then is polymerized with the monomer to give the corresponding sorbent. Cavities as templates, proper for the size and shape of the analyte, are formed in the polymer matrix upon the removal of the imprinted ion [18][19][20][21]. The IIP have been used for chromatography, sensors (such as voltammetric or potentiometric) and solid phase extraction [22][23][24][25].…”