Octaphosphinoylated para-tert-butylcalixarene as an extracting agent for uranyl ions in an acidic nitrate medium: study of the extracted uranyl calixarene compound
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The uranyl ion extraction properties of an octaphosphinoylated para-tert-butylcalix  arene (B8bL8) 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 B8bL8 towards uranyl ions. Both techniques revealed a 2 UO22+:1 B8bL8 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. B8bL8 in CHCl3 would be highly useful for the treatment of nuclear or radioactive wastes containing uranium in rich aqueous–acidic–saline media.
KeywordsUranyl extraction Fluorescence Calixarene loading capacity Rich acidic-saline-aqueous phases
This work was supported by CONACYT [Grant No. 36689-E], Mexico; and the Swiss National Science Foundation [Grant SCOPES 2000–2002: No. 7BUPJ062293.00/1], Switzerland. We thank Ricardo Soria from the analytical department for his help in the uranium determination by ICP and the technicians from the chemistry department of ININ for their help. We thank Carmen Lopez from the reactor department for the uranium measurements by NAA. We thank Dr. Enrique Morales-Avila for the XPS measurements and Dr. Blanca Ocampo-García for the MIR measurements of the solid extract. Last but not least, we profoundly acknowledge and thank Prof. Jean-Claude Bünzli for the invaluable support in this work.
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Conflict of interest
The authors declare that they have no conflict of interest with respect to the research, authorship, and/or publication of this article.
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