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Fast selective homogeneous extraction of UO22+ with carboxyl-functionalised task-specific ionic liquids.


ABSTRACT: The carboxyl-functionalised task-specific ionic liquid of 1-carboxymethyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)imide ([HOOCmim][NTf2]) was used as solvent and extractant for UO22+ extraction from aqueous solution. A homogeneous phase of [HOOCmim][NTf2]-H2O system could be achieved at 75?°C, and 86.8?±?4.8% of UO22+ was separated from the aqueous solution after vibrating for only 1?min. Furthermore, nearly 97.3?±?2.9% of UO22+ was stripped from [HOOCmim][NTf2] phase by 1?M HNO3 solution. K+, Na+, Mg2+, Dy3+, La3+, and Eu3+ have little influence on the homogeneous extraction of UO22+, and the extraction efficiency of UO22+ still remained at ca. 80%. Experimental and theoretical study on the selectivity of [HOOCmim][NTf2]-H2O system were performed for the first time. Density functional theory calculation indicates that the solvent effect plays a significant role on the selectivity of [HOOCmim][NTf2]-H2O.

SUBMITTER: Ao Y 

PROVIDER: S-EPMC5349554 | BioStudies | 2017-01-01T00:00:00Z

REPOSITORIES: biostudies

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