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Selective electrochemical capture and release of uranyl from aqueous alkali, lanthanide, and actinide mixtures using redox-switchable carboranes

We report the selective electrochemical biphasic capture of the uranyl cation (UO(2)(2+)) from mixed-metal alkali (Cs(+)), lanthanide (Nd(3+), Sm(3+)), and actinide (Th(4+), UO(2)(2+)) aqueous solutions to an organic, 1,2-dichloroethane (DCE), phase using the ortho-substituted nido-carborane anion,...

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Detalles Bibliográficos
Autores principales: Keener, Megan, Mattejat, Maxwell, Zheng, Shao-Liang, Wu, Guang, Hayton, Trevor W., Ménard, Gabriel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8943888/
https://www.ncbi.nlm.nih.gov/pubmed/35432881
http://dx.doi.org/10.1039/d1sc07070c
Descripción
Sumario:We report the selective electrochemical biphasic capture of the uranyl cation (UO(2)(2+)) from mixed-metal alkali (Cs(+)), lanthanide (Nd(3+), Sm(3+)), and actinide (Th(4+), UO(2)(2+)) aqueous solutions to an organic, 1,2-dichloroethane (DCE), phase using the ortho-substituted nido-carborane anion, [1,2-(Ph(2)PO)(2)-1,2-C(2)B(10)H(10)](2−) ((PO)Cb(2−)). The reduced (PO)Cb(2−) is generated by electrochemical reduction of the closo-carborane, (PO)Cb, prior to mixing with the aqueous mixed-metal solution. Subsequent UO(2)(2+) release from the captured product, [UO(2)((PO)Cb)(2)](2−), was performed by galvanostatic bulk electrolysis of the DCE phase and back-extraction of UO(2)(2+) to a fresh aqueous phase. The selective capture and release of UO(2)(2+) was confirmed by combined ICP-OES and NMR spectral analyses of the aqueous and organic phases, respectively, against the newly synthesized nido-carborane complexes, [[CoCp*(2)][Cs((PO)Cb)]](2), [CoCp*(2)](3)[Nd((PO)Cb)(3)], [CoCp*(2)](3)[Sm((PO)Cb)(3)], and [CoCp*(2)](2)[Th((PO)Cb)(3)].