Extractive and Sorption Preconcentration of Rhenium(VII) with the Use of Phosphoryl-Containing Podands

摘要

Interphase distribution of micro amounts of ReO_4~- between aqueous solutions of mineral acids and solutions of phosphoryl-containing mono-, di-, and tripodands, derived from l-(methoxydiphenylphos-phoryl)-2-diphenylphosphorylbenzene in dichloroethane was studied. The stoichiometry of extracted complexes was determined, the effect of HNO_3, HCl, and H_2SO_4 concentration in aqueous phase and the nature of organic solvent on the efficiency of transition of ReO_4~- ions into organic phase was considered. The growth of the number of phosphoryl groups in podand molecule enhances its extraction ability toward Re(VII). The possibility of selective recovery and preconcentration of Re(VII) with complexing sorbent obtained by non-covalent binding of phosphoryl-containing podand on the surface of macroporous polymer Amberlite XAD7HP was shown.