Octaphosphinoylated para-tert-butylcalix[8]arene as an extracting agent for uranyl ions in an acidic nitrate medium: study of the extracted uranyl calixarene compound

摘要

The uranyl ion extraction properties of an octaphosphinoylated para-tert-butylcalix [8] arene (B(8)bL(8)) in CHCl3 from an aqueous-acidic-saline medium containing a uranyl nitrate salt were investigated. UV-Vis and luminescence techniques allowed us to evaluate the extraction capability and loading capacity of B(8)bL(8) towards uranyl ions. Both techniques revealed a 2 UO22+:1 B(8)bL(8) stoichiometry for the main extracted species in the organic phases. IR, NAA, and XPS analyses of the pure solid recovered from the extracts demonstrated such a stoichiometry. B(8)bL(8) in CHCl3 would be highly useful for the treatment of nuclear or radioactive wastes containing uranium in rich aqueous-acidic-saline media.