Liquid-liquid extraction and facilitated transport of f-elements using an N-pivot tripodal ligand.
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Abstract |
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Diglycolamide (DGA)-functionalized tripodal ligands offer the required nine-coordinated complex for effective binding to a trivalent lanthanide/actinide ion. A N-pivot tripodal ligand (TREN-DGA) containing three DGA pendant arms was evaluated for the extraction and supported liquid membrane transport studies using PTFE flat sheets. Solvent extraction studies indicated preferential extraction of 1:1 (M:L) species, while the metal ion extraction increased with increasing HNO3 concentration conforming to a solvated species extraction. Flat sheet-supported liquid membrane studies, carried out using 4.0 × 10-3 M TREN-DGA in 95% n-dodecane + 5% iso-decanol indicated faster mass transport for Eu3+ ion as compared to Am3+ ion. The determined transport parameters indicated slow diffusion of the M-TREN-DGA (M = Am or Eu) complex being the rate-determining step. The transport of lanthanides and actinides followed the trend: Eu3+ > Am3+∼ Pu4+ > UO22+ and Am can be selectively separated from a mixture of U and Pu by oxidizing the latter to its +6 oxidation state. The liquid membrane stability was not encouraging and was deteriorating the transport efficiency with time, which was attributed to carrier loss into the aqueous phases. |
Year of Publication |
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2017
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Journal |
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Journal of hazardous materials
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Volume |
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347
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Number of Pages |
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478-485
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Date Published |
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2017
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ISSN Number |
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0304-3894
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URL |
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http://linkinghub.elsevier.com/retrieve/pii/S0304-3894(17)30968-8
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DOI |
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10.1016/j.jhazmat.2017.12.068
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Short Title |
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J Hazard Mater
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