Journal
SOLVENT EXTRACTION AND ION EXCHANGE
Volume 40, Issue 1-2, Pages 106-139Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07366299.2021.1899614
Keywords
droplet model; ienaics; synergy; polydispersity in aggregation; extraction landscape
Categories
Funding
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant [320915, BIFR/CEA/16-18-002]
- Slovenian Research Agency [P3-0388]
- French ANR Agence Nationale de la Recherche grant [ANR-18-CE29-0010]
- Laboratory Chemisyst [ANR 11-01-05]
- Agence Nationale de la Recherche (ANR) [ANR-18-CE29-0010] Funding Source: Agence Nationale de la Recherche (ANR)
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This article discusses the application of ienaic modeling for the solvent extraction of rare earths using a mixed DMDOHEMA/HDEHP extractant system. The study compares experimental findings with theoretical predictions of the droplet model, showing that different behaviors in the extraction process depend on the acidity and mole fraction of extractants.
In this article Part II, we consider the application of ienaic modeling for solvent extraction of rare earths in the case of the mixed DMDOHEMA/HDEHP extractant system. The system exhibits a synergistic extraction effect depending on the acid concentration and the extractant mole fraction, as demonstrated in the experimental article Part I. In this work, we directly compare experimental findings with theoretical predictions of the droplet model. The model considers the effective free energy of transfer as a combination of competing molecular forces, but contrary to previous micelle models that focus only on the dominant stoichiometry, it allows calculations of free energies of every possible spherical aggregate. The resulting image of the extraction process is that different behaviors can be obtained depending on the acidity and mole fraction of extractants, which are associated with different aggregation regimes in a complex free energy landscape of the system. Nevertheless, self-assembly is tuned by the extraction of all solutes, and not only the target metal cations.
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