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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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
06 May, 2024
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| In: |
Solvent extraction and ion exchange
Year: 2024, Volume: 42, Issue: 2, Pages: 118-132 |
| ISSN: | 1532-2262 |
| DOI: | 10.1080/07366299.2024.2349528 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1080/07366299.2024.2349528
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| Author Notes: | Thomas Sittel, Karolin Becker, Andreas Geist, and Petra J. Panak |
| Summary: | 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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| Item Description: | Gesehen am 13.03.2025 Im Titel ist "+" hochgestellt |
| Physical Description: | Online Resource |
| ISSN: | 1532-2262 |
| DOI: | 10.1080/07366299.2024.2349528 |