Preparation of microspheric Fe(III)-ion imprinted polymer for selective solid phase extraction

Abstract

In this research work, an Fe(III)-IIP was prepared using methacrylic acid as monomer, divinylbenzene as cross-linker, azobisisobutyronitrile as initiator. The ion imprinted polymer was functionalized with Fe(III)8-hydroxy quinolone complex under thermal conditions by copolymerization with the monomer and the cross-linker. The prepared Fe(III)-ion imprinted polymer (IIP) and non-ion imprinted polymer (Non-IIP) were characterized with fourier transform-infrared spectroscopy, scanning electron microscopic analysis and thermal gravimetric analysis. The polymer showed a good stability to thermal analysis up to a temperature of 500 °C. The size of the polymer obtained was 1 µm, large enough to be filtered easily. At pH 2.5 more affinity was observed with ion imprinted polymer in comparison to non-ion imprinted polymer. For the kinetic study, the most linear and rhythmical relation were seen in pseudo second order. The maximum sorption capacity of Fe(III) ions on Fe(III)-IIP and non-IIP was 170 and 30.0 µmolg −1 , respectively. The relative selectivity factor (αr) values of Fe(III)/Fe(II), Fe(III)/Al(III) and Fe(III)/Cr(III) were 151.0, 84.6 and 91.9, respectively. The preconcentration factor was found to be 240. The developed method was successfully applied to the determination of trace Fe in the drinking water.

Molecularly Imprinted Polymers for Selective Recognition and Extraction of Heavy Metal Ions and Toxic Dyes

“…126 The conventional iron extraction technologies include the solvent extraction, which has been reported in various literatures investigated with neutral extracts, like ketones, amines, ethers, etc., but neutral extracts are linked with some disadvantages like slow kinetics and need high mineral acid quantities for the recovery of iron. Keeping these problems in focus, Ara et al 127 demonstrated an ionimprinted polymer technique derived by thermal copolymerization of the complex of Fe(III), MAA, and divinyl benzene. The target of this study is to offer a process which can completely remove the Fe(III) from a mixture of solution and then can be applied to practicality.…”

“…Reaction mechanism of Fe­(III)-IIP by using an 8-hydroxyquinoline complex (figure credit: Springer-Nature 2018, distributed under Creative Commons CC-BY).…”

Fe(II)ion‐imprinted copolymer gels − smart materials for Fe(II)/Fe(III) speciation in surface waters

“…However, these sorbents have been used mostly for Fe(II) or Fe(III) enrichment; their application for Fe(II)/Fe(III) speciation has not been tested. Only Roushani et al ., 17 Ara et al 20 . and Saatçilar et al 21 .…”

“…8,9 Choosing the right functional monomer and ligand is a key factor that determines the stability of the complex formed before and during the polymerization process as well as the subsequent ability of the IIP to interact selectively with the target ion. According to the available literature, there are studies on new IIPs and their application for SPEs of Fe(II) 10 and Fe(III) [11][12][13][14][15][16][17][18][19][20] ions. However, these sorbents have been used mostly for Fe(II) or Fe(III) enrichment; their application for Fe(II)/ Fe(III) speciation has not been tested.…”

“…However, these sorbents have been used mostly for Fe(II) or Fe(III) enrichment; their application for Fe(II)/ Fe(III) speciation has not been tested. Only Roushani et al, 17 Ara et al 20 and Saatçilar et al 21 have shown distribution coefficients for synthesized IIPs for Fe(III) in the presence of Fe(II) ions, but the analytical methods developed are still applied solely for Fe(III) determination. From this point of view, the idea of the present study was to investigate the ability of IIPs to selectively react to different oxidation states of an element.…”