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<p>The efficient capture and recovery of radioactive iodine (I₂) is crucial for nuclear safety and environmental protection. In this study, we propose some glycerol (Gly)-based deep eutectic solvents (DESs) as novel and promising solvents for iodine uptake from the vapour phase. Depending on the cholinium salt (Ch<sup>+</sup>) selected as hydrogen bond acceptor (iodide or chloride) and its relative ratio with respect to glycerol (1:2 or 1:3), the I<sub>2</sub> uptake approaches or even overcomes the 300 ms% with ChCl:Gly 1:2 showing the best performance with 4 g g<sup>−1</sup> after 24 h. Moreover, the captured I<sub>2</sub> can be effectively (almost 80%) released showcasing the potential of DESs as iodine sponges. Finally, the exploitation of Raman spectroscopy proves the speciation of I-based species within the DES, paving the way for further engineering of these systems. Our results highlight Gly-based DES as a sustainable and cheap solvent for effective and semi-reversible I<sub>2</sub> sponges.</p><p></p>

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Glycerol-based deep eutectic solvents for efficient and reversible iodine uptake from vapour phase

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月7日

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  • Daniele Motta,
  • Saïd Mondahchouo,
  • Stefano Nejrotti,
  • Carlotta Pontremoli,
  • Claudia Barolo,
  • Alessandro Damin,
  • Matteo Bonomo

摘要

The efficient capture and recovery of radioactive iodine (I₂) is crucial for nuclear safety and environmental protection. In this study, we propose some glycerol (Gly)-based deep eutectic solvents (DESs) as novel and promising solvents for iodine uptake from the vapour phase. Depending on the cholinium salt (Ch+) selected as hydrogen bond acceptor (iodide or chloride) and its relative ratio with respect to glycerol (1:2 or 1:3), the I2 uptake approaches or even overcomes the 300 ms% with ChCl:Gly 1:2 showing the best performance with 4 g g−1 after 24 h. Moreover, the captured I2 can be effectively (almost 80%) released showcasing the potential of DESs as iodine sponges. Finally, the exploitation of Raman spectroscopy proves the speciation of I-based species within the DES, paving the way for further engineering of these systems. Our results highlight Gly-based DES as a sustainable and cheap solvent for effective and semi-reversible I2 sponges.