Abstract
Guanidine hydrochloride was chemically bonded to surface of modified silica by means of condensation with grafted amino groups. Ion-exchanging and complexing properties of the obtained adsorbent have been studied with respect to cations of Zn(II), Cu(II), Pb(II), Cd(II), Co(II) and metal-containing oxoanions of W(VI), Mo(VI), Cr(VI), V(V). Optimum conditions for quantitative extraction of the studied ions were determined. The structure and composition of Co(II) and Cu(II) complexes on the surface of the synthesized adsorbent have been investigated. The possibility of quantitative determination of cobalt(II) and copper(II) trace amounts after their preconcentration by the synthesized adsorbent was demonstrated.
Highlights
Surface immobilized silicas are widely used in solid-phase extraction, concentration and further quantitative analysis of ions and molecules
Adsorbent with a monolayer of chemically bound guanidyl groups was prepared by condensation of guanidine hydrochloride with amino groups of modified silica
Silica gel with chemically bound guanidine hydrochloride has well-expressed ion-exchanging characteristics and removes oxoanions of W(VI), Mo(VI), Cr(VI) and V(V) from the acidic media
Summary
Surface immobilized silicas are widely used in solid-phase extraction, concentration and further quantitative analysis of ions and molecules. These adsorbents could quantitatively extract Zn(II), Cu(II), Fe(III), W(VI) ions and Mo-, V- and Cr-containing oxoanions from aqueous solutions over a wide concentration range. Such adsorption characteristics are caused by the presence of guanidyl groups in polymer chain of polyhexamethyleneguanidine. There are significant difficulties of the polymer transporting into pores of the silica matrix In this respect, it was supposed that the modified silica with grafted layer of monomeric guanidine must have the better kinetic adsorption characteristics. We have taken into account the fact that synthesis of polyhexamethyleneguanidine is usually implemented via the condensation reaction of guanidine hydrochloride with hexamethylenediamine [11]
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