Extraction behavior of lanthanides using a diglycolamide derivative TODGA in ionic liquids

Shimojo, Kojiro ; Kurahashi, Kensuke; Naganawa, Hirochika

Liquid-liquid extraction of lanthanides from aqueous solutions into ionic liquids (ILs) has been investigated using -tetra(-octyl)diglycolamide (TODGA) as an extractant, and compared with that in the isooctane system. Application of ILs as extracting phase provided unprecedented enhancement of the extraction performance of TODGA for lanthanides compared with that of the isooctane system. Slope analysis confirmed that TODGA in ILs formed a 1:3 complex with La $^{3+}$ , Eu $^{3+}$ , or Lu $^{3+}$ . On the other hand, the molar ratios of species extracted into isooctane were 1:3 for La $^{3+}$ or 1:4 for Eu $^{3+}$ and Lu $^{3+}$ , depending on the atomic number of lanthanides. The transfer of lanthanides with TODGA into ILs proceeded via a cation-exchange mechanism, in contrast to ion pair extraction in the isooctane system. Furthermore, we clarified that TODGA provided the selectivity for middle lanthanides in the ILs systems, but heavier lanthanides in the isooctane system.

Language	:	English
Journal	:	Dalton Transactions
Volume	:	2008
Number	:	37
Pages	:	p.5083 - 5088
Publication Year/Month	:	2008/10
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Paper URL	:	https://doi.org/10.1039/b810277p
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Registration No. : AA20080333
JAEA Abstracts No. : 36001267
Paper Submission No. : 4561

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