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Issue 37, 2008
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Extraction behavior of lanthanides using a diglycolamide derivative TODGA in ionic liquids

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Abstract

Liquid–liquid extraction of lanthanides from aqueous solutions into ionic liquids (ILs) has been investigated using N,N,N′,N′-tetra(n-octyl)diglycolamide (TODGA) as an extractant, and compared with that in the isooctane system. Application of ILs as the 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 La3+, Eu3+, or Lu3+. On the other hand, the molar ratios of species extracted into isooctane were 1 : 3 for La3+ or 1 : 4 for Eu3+ and Lu3+, depending on the atomic number of the lanthanide. 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 selectivity for the middle lanthanides in the ILs systems, but heavier lanthanides in the isooctane system.

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

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Publication details

The article was received on 17 Jun 2008, accepted on 19 Jun 2008 and first published on 07 Aug 2008


Article type: Paper
DOI: 10.1039/B810277P
Citation: Dalton Trans., 2008,0, 5083-5088
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    Extraction behavior of lanthanides using a diglycolamide derivative TODGA in ionic liquids

    K. Shimojo, K. Kurahashi and H. Naganawa, Dalton Trans., 2008, 0, 5083
    DOI: 10.1039/B810277P

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