Sorbents based on calix[4]arenes for extraction of technetium(VII) from acidic and alkaline media

摘要

Sorption of Tc~(VII) from solutions of various compositions with new sorbents prepared by the noncovalent immobilization of (thia)calix[4]arenes on the Amberlite XAD-7? support was studied. The sorbents studied efficiently extract technetium(VII) from both acidic and alkaline media. The sorption capacity of the sorbent with thiacalix[4]arene groups is superior to that of the sorbents with calix[4]arene groups and several times higher than that of the sorbents previously proposed for the sorption of Tc~(VII). Technetium(VII) is sorbed by this sorbent as 1 : 1 and 1 : 2 thiacalix[4]arene-NH4TcO4 and 1 : 1 and 1 : 2 thiacalix[4]arene-NaTcO4 complexes.