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<p>This study proposes a rapid and effective extraction system for the separation of Ba<sup>2+</sup> from various coexisting ions. Di-tert-butyldicyclohexano-18-crown-6/ dichloromethane (DtBuCH18C6/CH<sub>2</sub>Cl<sub>2</sub>) rapidly separated 90% of Ba<sup>2+</sup> (1&#xa0;M nitric acid solution) by a single-stage extraction step. Furthermore, Barium (Ba) often serves as a non-radioactive surrogate for Radium (Ra), but our findings show that Ra<sup>2+</sup> chemistry cannot always be predicted using Ba<sup>2+</sup>. Probably because the ionic radius of Ra<sup>2+</sup> is a little bigger than Ba<sup>2+</sup>, the Ra-DtBuCH18C6 complex retains the coordinated water molecules. Consequently, the (H2O)<sub><i>x</i></sub>-Ra-DtBuCH18C6 complex is poorly transferred (20%) into the organic solvent.</p> Graphic abstract <p></p>

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Efficient extraction of radium by DtBuCH18C6: performance and coordination study

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Bingqian Li,
  • Chengyun Fu,
  • Yufang Yan,
  • Mark Julian Henderson,
  • Xinyue Chen,
  • Shan Zhu,
  • Minhao Yan

摘要

This study proposes a rapid and effective extraction system for the separation of Ba2+ from various coexisting ions. Di-tert-butyldicyclohexano-18-crown-6/ dichloromethane (DtBuCH18C6/CH2Cl2) rapidly separated 90% of Ba2+ (1 M nitric acid solution) by a single-stage extraction step. Furthermore, Barium (Ba) often serves as a non-radioactive surrogate for Radium (Ra), but our findings show that Ra2+ chemistry cannot always be predicted using Ba2+. Probably because the ionic radius of Ra2+ is a little bigger than Ba2+, the Ra-DtBuCH18C6 complex retains the coordinated water molecules. Consequently, the (H2O)x-Ra-DtBuCH18C6 complex is poorly transferred (20%) into the organic solvent.

Graphic abstract