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<p>To effective reduce U(VI) to U(IV) in HNO<sub>3</sub> solution, constant-potential electrolysis was conducted in different conditions to optimize the electrolysis conditions. The results show that U(VI) reduction efficiency was highest at − 300&#xa0;mV in 3–6&#xa0;M HNO<sub>3</sub> solution. Ru(III), Zr(IV), and Fe(III) all reduced U(VI) reduction efficiency, particularly Fe(III). Adding hydrazine to solution containing U(VI) and Fe(III) suppressed HNO<sub>2</sub> accumulation and enhanced U(VI) electroreduction. The electroreduction of U(VI) in the presence of multiple impurity ions and different HNO<sub>3</sub> concentrations was also conducted, indicating that 6&#xa0;M HNO<sub>3</sub> is optimal for U(VI) reduction.</p>

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Electroreduction of U(VI) in nitric acid solution: Efficiency optimization and the impact of impurities

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Wenlong Li,
  • Jiandong Li,
  • Binghong Liu,
  • Ruke Yu,
  • Ji Wang,
  • Lifeng Chen,
  • Ningchao Zheng,
  • Deqian Zeng,
  • Xiangbiao Yin,
  • Yuezhou Wei

摘要

To effective reduce U(VI) to U(IV) in HNO3 solution, constant-potential electrolysis was conducted in different conditions to optimize the electrolysis conditions. The results show that U(VI) reduction efficiency was highest at − 300 mV in 3–6 M HNO3 solution. Ru(III), Zr(IV), and Fe(III) all reduced U(VI) reduction efficiency, particularly Fe(III). Adding hydrazine to solution containing U(VI) and Fe(III) suppressed HNO2 accumulation and enhanced U(VI) electroreduction. The electroreduction of U(VI) in the presence of multiple impurity ions and different HNO3 concentrations was also conducted, indicating that 6 M HNO3 is optimal for U(VI) reduction.