Extraction and sorption preconcentration of rhenium with the use of 2-phosphorylphenoxyacetamides

Abstract

Interfacial distribution of micro amount of ReO₄^- between aqueous solutions of mineral acids and solutions of 2-phosphorylphenoxyacetamides in dichloroethane has been studied. Stoichiometry of extracted complexes has been determined; the effect of HNO₃, HCl, and H₂SO₄ concentration in aqueous phase, extractant structure, and organic solvent nature on the efficiency of ReO₄^- ions transfer into organic phase has been considered. It has been shown that Re(VII) can be selectively recovered and concentrated with complexing sorbent obtained by the noncovalent binding of 2-[2-(diphenylphosphoryl)-4-ethylphenoxy]-N,N-dioctylacetamide on the surface of macroporous polymer Amberlite XAD7HP.