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<p>The recycling of neptunium (Np) from nuclear wastes is crucial for the sustainable development of nuclear energy, yet it is still a challenging task owing to the complexity of Np chemistry. Precise control of oxidation state is highly desirable for the effective recovery of Np. In this study, we report an innovative strategy for Np recovery through <i>in-situ</i> coordination and reduction of Np(V) in a biphasic extraction system. By leveraging the synergistic effects of coordination by a P=O donating ligand (trialkyl phosphine oxide, TRPO) and reduction by hydroquinone (HQ) in the organic phase, efficient Np(V)-to-Np(IV) conversion and high distribution ratio (<i>D</i>) of Np were achieved in a single extraction contact. The reduction mechanism of Np was elucidated through spectroscopic and theoretical analyses. This work enriches the redox chemistry of Np and provides a novel pathway for Np recovery in advanced nuclear fuel cycles.</p>

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Coordination-driven in-situ reduction and extraction of neptunium

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Huaixin Hao,
  • Shuyun Zhang,
  • Xue Dong,
  • Qilong Tang,
  • Yuxiao Guo,
  • Yaoyang Liu,
  • Jing Chen,
  • Jing Su,
  • Zhipeng Wang,
  • Chao Xu

摘要

The recycling of neptunium (Np) from nuclear wastes is crucial for the sustainable development of nuclear energy, yet it is still a challenging task owing to the complexity of Np chemistry. Precise control of oxidation state is highly desirable for the effective recovery of Np. In this study, we report an innovative strategy for Np recovery through in-situ coordination and reduction of Np(V) in a biphasic extraction system. By leveraging the synergistic effects of coordination by a P=O donating ligand (trialkyl phosphine oxide, TRPO) and reduction by hydroquinone (HQ) in the organic phase, efficient Np(V)-to-Np(IV) conversion and high distribution ratio (D) of Np were achieved in a single extraction contact. The reduction mechanism of Np was elucidated through spectroscopic and theoretical analyses. This work enriches the redox chemistry of Np and provides a novel pathway for Np recovery in advanced nuclear fuel cycles.