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<p>This study explores the coordination of Ethylenediamine Triacetic Acid chelating resin with U(VI)/Nd(III) via potentiometric titration, determining the protonation constants of H₃L and stability constants of H₃L—U(VI)/Nd(III) complexes. Batch experiments confirm complexes like UO₂HL, UO₂L⁻, UO₂(OH)L<sup>2</sup>⁻, NdHL⁺, and NdL. Fixed H₃L differs from free H₃L; adjacent carboxylic groups may form hydrogen bonds, enhancing lg<i>β</i>₃. H₃L forms a tridentate coordination with U(VI). The competitive adsorption of U(VI) and Nd(III) within a pH range is calculated and verified. Additionally, U(VI) adsorption in the presence of citric acid is calculated, supporting practical applications.</p>

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Complexation structure and thermodynamic analysis of uranium (VI)/neodymium (III) adsorption by ethylenediamine triacetic acid chelating resin: based on potentiometric titration

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Zhi Li,
  • Shenghui Huang,
  • Yan Shen,
  • Yonggang Zhao,
  • Zhiyuan Chang,
  • Yan Chen,
  • Yan Zhang,
  • Tongxing Wang,
  • Shengjie Yu,
  • Chen Wang,
  • Guoxin Tian

摘要

This study explores the coordination of Ethylenediamine Triacetic Acid chelating resin with U(VI)/Nd(III) via potentiometric titration, determining the protonation constants of H₃L and stability constants of H₃L—U(VI)/Nd(III) complexes. Batch experiments confirm complexes like UO₂HL, UO₂L⁻, UO₂(OH)L2⁻, NdHL⁺, and NdL. Fixed H₃L differs from free H₃L; adjacent carboxylic groups may form hydrogen bonds, enhancing lgβ₃. H₃L forms a tridentate coordination with U(VI). The competitive adsorption of U(VI) and Nd(III) within a pH range is calculated and verified. Additionally, U(VI) adsorption in the presence of citric acid is calculated, supporting practical applications.