Calix[n]arene phosphine oxides. A new series of cation receptors for extraction of europium, thorium, plutonium and americium in nuclear waste treatment

Abstract
A novel class of calixarene derivatives with phosphine oxide residues [Calix-(OCH2CH2POPh2)n] attached to the lower rim showing high efficiency in extraction of EuIII, ThIV, PuIV, and AmIV from simulated nuclear waste is reported.

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