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Temperature Effect On The Extraction Of Am(iii), U(vi), And Sr(ii) By Dialkyl-substituted Alkylenediphosphonic Acids

Authors :
Emmanuel O. Otu
Renato Chiarizia
Source :
Separation Science and Technology. 38:2619-2636
Publication Year :
2003
Publisher :
Informa UK Limited, 2003.

Abstract

Solvent extraction reagents containing the diphosphonic acid group exhibit extraordinary affinity for tri-, tetra-, and hexavalent actinides. Use of these reagents has been proposed for actinide separation and preconcentration procedures. A new extractant, P,P′-di(2-ethylhexyl) benzene-1,2-diphosphonic acid (H2DEH[1,2-BzDP]), has been synthesized. Its metal extraction characteristics are reported and compared to the previously synthesized P,P′-di(2-ethylhexyl) methylene-(H2DEH[MDP]), ethylene-(H2DEH[EDP]), and butylene-(H2DEH[BuDP]) diphosphonic acids. Different degrees of aggregation and different extraction mechanisms and stoichiometries have been reported for these ligands. In this work, thermodynamic parameters associated with the extraction of selected metal ions by these ligands were measured to provide further insight into the mechanism of the extraction processes involved. Knowledge of the enthalpy, entropy, and free-energy changes, in combination with other fundamental principles governing extrac...

Details

ISSN :
15205754 and 01496395
Volume :
38
Database :
OpenAIRE
Journal :
Separation Science and Technology
Accession number :
edsair.doi...........0e64c36720aa0ffd998be7b0e582a2dc
Full Text :
https://doi.org/10.1081/ss-120022563