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.
Highlights
Iron (Fe) is one of the most important essential macronutrient and a heavy metal
Divinylbezene was used as cross-linker for synthesis of Fe(III)-imprinted polymer (IIP) in this work
The divinylbenzene was selected for using as cross-linker due to two reasons: first the size of poly divinylbezene particle is commonly 1 μm in size when prepared in different solvent and, it is suitable for solid phase extraction columns packing, second there is an additional p–p interaction of divinylbenzene with complex, efficiency of imprinting polymer has been increased (Jeffery et al 1989; Singh and Mishra 2010a, b, c; Cui et al 2013; Yilmaza et al 2014)
Summary
Iron (Fe) is one of the most important essential macronutrient and a heavy metal. It occurs freely, or in the compound containing Fe when in solid form. In the compound containing Fe when in solid form It exists as Fe2+, the ferrous form, and F e3+, the ferric form in aqueous solution. The dietary reference intake lists the tolerable upper intake level for adults as 45 mg/day. For children under 14 years old the upper intake level is 40 mg/ day (Pospiech and Walkowiak 2010)
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