Cs+ extraction from chloride-rich brine solutions using the calixarene crown ether MAXCalix

• Verfasst von: Sittel, Thomas [VerfasserIn]
• Verfasst von: Becker, Karolin [VerfasserIn]
• Verfasst von: Geist, Andreas [VerfasserIn]
• Verfasst von: Panak, Petra [VerfasserIn]
• Titel: Cs+ extraction from chloride-rich brine solutions using the calixarene crown ether MAXCalix
• Verf.angabe: Thomas Sittel, Karolin Becker, Andreas Geist, and Petra J. Panak
• E-Jahr: 2024
• Jahr: 06 May, 2024
• Umfang: 15 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 13.03.2025 ; Im Titel ist "+" hochgestellt
• Titel Quelle: Enthalten in: Solvent extraction and ion exchange
• Ort Quelle: Philadelphia, PA : Taylor & Francis, 1983
• Jahr Quelle: 2024
• Band/Heft Quelle: 42(2024), 2, Seite 118-132
• ISSN Quelle: 1532-2262
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Calixarene crown ether
• Sach-SW: cesium separation
• Sach-SW: chloride
• Sach-SW: liquid-liquid extraction
• K10plus-PPN: 1919725059

Abstract

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.