Extractive and Sorption Preconcentration of Rhenium(VII) Ions
with the Use of Bis(diphenylphosphoryl)-Substituted Aza Podand

A. N. Turanov^a, V. K. Karandashev^b, and N. A. Bondarenko^{b, c}

^a Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia

^b Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences,
Chernogolovka, Moscow oblast, 142432 Russia

^c Research Institute of Highly Pure Chemical Substances and Chemicals, Bogorodskii val 3, Moscow, 107076 Russia

Received May 10, 2012

Abstract—Interfacial distribution of trace amounts of ions between aqueous solutions of mineral acids
and solutions of diphosphoryl-substituted aza podand [Ph₂P(O)CH₂CH₂OCH₂CH₂]₂NBu (I) in dichloroethane
was studied. The stoichiometry of extracted complexes was determined, the influence of HClO₄, HNO₃, HCl,
and H₂SO₄ concentration in aqueous phase and the nature of organic solvent on the efficiency of transition of
ions into organic phase was considered. Aza podand I shows larger extraction ability toward Re(VII) than
monophosphorylated amines. The possibility of selective extraction and preconcentration of ions by a
complex-forming sorbent obtained by the noncovalent binding of compound I on the surface of carbon nano-
tubes was shown.

DOI: 10.1134/S0036023613050239

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