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<p>This study explored U immobilization via meta-autunite precipitation in a Ca(II)-U(VI)-PO<sub>4</sub><sup>3−</sup> system using NaOH/HNO<sub>3</sub> as inorganic pH regulators. Results demonstrated inorganic regulators achieved comparable U immobilization efficiency (98%) to organic ones under optimal conditions: 4&#xa0;h reaction, 60–100&#xa0;mg/L U, 25&#xa0;°C, pH 6.0, and Ca:U:P = 50:1:10. XRD, SEM, and FT-IR analyses revealed no significant differences in product composition/structure between inorganic and organic regulators. However, inorganic-regulated products exhibited higher crystallinity and lamellar stacked grains. Despite NaOH usage, Na was absent in products due to meta-autunite’s superior stability over Na-autunite, favoring its preferential precipitation and inhibiting Na-autunite formation.</p>

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Precipitation of meta-autunite from Ca(II)-U(VI)-PO43− system with inorganic pH regulator for uranium immobilization

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Jiamei Rao,
  • Pingchao Ke,
  • Kunkun Wang,
  • Tiannan Wu,
  • Tingting Zhong,
  • Jiale Li,
  • Huichun Gong,
  • Lingling Xu,
  • Yipeng Zhou,
  • Zhanxue Sun

摘要

This study explored U immobilization via meta-autunite precipitation in a Ca(II)-U(VI)-PO43− system using NaOH/HNO3 as inorganic pH regulators. Results demonstrated inorganic regulators achieved comparable U immobilization efficiency (98%) to organic ones under optimal conditions: 4 h reaction, 60–100 mg/L U, 25 °C, pH 6.0, and Ca:U:P = 50:1:10. XRD, SEM, and FT-IR analyses revealed no significant differences in product composition/structure between inorganic and organic regulators. However, inorganic-regulated products exhibited higher crystallinity and lamellar stacked grains. Despite NaOH usage, Na was absent in products due to meta-autunite’s superior stability over Na-autunite, favoring its preferential precipitation and inhibiting Na-autunite formation.