Cs+ extraction from chloride-rich brine solutions using the calixarene crown ether MAXCalix
We have developed an extraction method for the retrieval of Cs+ from chloridecontaining salt brine solutions. We employ the calixarene crown ether known as MAXCalix as the extractant, which exhibits a remarkable selectivity for Cs+ over Na+, K+, Mg2+ and Ca2+, with separation factors ranging from 10...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
06 May, 2024
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| In: |
Solvent extraction and ion exchange
Year: 2024, Jahrgang: 42, Heft: 2, Pages: 118-132 |
| ISSN: | 1532-2262 |
| DOI: | 10.1080/07366299.2024.2349528 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1080/07366299.2024.2349528
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| Verfasserangaben: | Thomas Sittel, Karolin Becker, Andreas Geist, and Petra J. Panak |
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| 245 | 1 | 0 | |a Cs+ extraction from chloride-rich brine solutions using the calixarene crown ether MAXCalix |c Thomas Sittel, Karolin Becker, Andreas Geist, and Petra J. Panak |
| 246 | 3 | 3 | |a Cs + extraction from chloride-rich brine solutions using the calixarene crown ether MAXCalix |
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| 520 | |a We have developed an extraction method for the retrieval of Cs+ from chloridecontaining salt brine solutions. We employ the calixarene crown ether known as MAXCalix as the extractant, which exhibits a remarkable selectivity for Cs+ over Na+, K+, Mg2+ and Ca2+, with separation factors ranging from 100 to 104. The efficiency of the extraction strongly depends on the chloride concentration in the aqueous phase. Notably, when the chloride concentration reaches 4 mol L−1, we achieve a Cs+ distribution ratio of 7.9. Accordingly, the retrieval of Cs+ from the organic phase is achieved when the HCl concentration is maintained at a low level. In multicomponent chloride brine solutions, the distribution ratios for Cs+ are somewhat lower, yet still fall within the range of 4-6. Nevertheless, these ratios remain favorable for separation purposes. Additionally, the distribution ratios of Na+, K+, Mg2+, and Ca2+ offer insights into the coordination chemistry of MAXCalix. Our experimental data indicate a correlation between ionic size and distribution ratio. Cs+ forms the strongest complex, followed by K+ and Na+, while Mg2+ and Ca2+ exhibit minimal extraction, potentially due to interactions with the diluent. These findings may open new approaches for the development of a decontamination strategy tailored to address salts and brine solutions contaminated with Cs-137. | ||
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| 650 | 4 | |a cesium separation | |
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