Extraction and sorption recovery of rhenium(VII) using oligodentate β-аminophosphoryl compounds

The interphase distribution of microquantities of ReO4– between aqueous solutions of mineral acids and solutions of oligodentate β-aminophosphoryl compounds in organic solvents was studied. The stoichiometry of the extracted complexes was determined, the influence of the concentration of HClO4, HNO3, HCl and H2SO4 in the aqueous phase, the structure of the extractant and the nature of the organic solvent on the efficiency of the transition of ReO4– ions into the organic phase was considered. The possibility of selective extraction and concentration of Re(VII) with a complexing sorbent obtained by non-covalent attachment of tris[bis(2-diphenylphosphorylethyl)aminoethyl]amine on the surface of the macroporous polymer Amberlite XAD7HP was demonstrated.