Effect of the structure of calix[4]arenes, containing phosphine oxide and phosphoryl groups and impregnated on silica gel, on the efficiency of Eu3+ extraction from aqueous solutions

Abstract

We have obtained efficient solid-phase extractants for extraction of Eu3+ ions from aqueous solutions. As the impregnates, we used a series of (thia)calix[4]arenes modified on the upper rim by phosphoryl and phosphine oxide groups. The materials obtained are characterized by sorption capacity 7.5-9.5 mg/g and let us extract up to 99% of the Eu3+ from aqueous solutions of moderate salinity.