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<p>Uranium, as a natural radioactive substance, exhibits strong mobility and physiological toxicity in the environment. This study seeks to create innovative fibrous adsorbent systems to improve the efficiency of uranium extraction and evaluate their reuse property. Composite materials as adsorbents are extensively investigated, however without the study on the interaction between the matrix and functional composites. Two polymers modified with phosphorus-containing ligands (DEHPA and TBP) named as DEHPA@PAN and TBP@PAN were prepared using the electrospinning technique. The morphology, surface charge, and functional components were characterized with SEM–EDS, Zeta potential and FT-IR. Batch experiments were conducted to investigate uranium adsorption performance, with adsorption isotherms, kinetics, and thermodynamics analyzed. DFT calculations were used to elucidate the interaction mechanisms between DEHPA or TBP with uranium. The results showed that DEHPA@PAN exhibited superior uranium adsorption capacity compared to TBP@PAN. Conversely, the latter has a higher cyclicality than the former. Van der Waals forces and electrostatic attraction were dominative in the interaction between PAN and DEHPA or TBP. The investigation offers novel perspectives on the use of advanced nanofiber sorbents to mitigate uranium pollution in water systems and emphasizes their suitability for repeated applications.</p>

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Separation of uranium with nanofibers treated with phosphorus-containing chelating agents: kinetics, thermodynamics, isotherms and reusability

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Guoquan Sun,
  • Di Zhang,
  • Wei Dai,
  • Jiali Guan,
  • Zhuyao Li,
  • Lei Xu,
  • Ying Dai

摘要

Uranium, as a natural radioactive substance, exhibits strong mobility and physiological toxicity in the environment. This study seeks to create innovative fibrous adsorbent systems to improve the efficiency of uranium extraction and evaluate their reuse property. Composite materials as adsorbents are extensively investigated, however without the study on the interaction between the matrix and functional composites. Two polymers modified with phosphorus-containing ligands (DEHPA and TBP) named as DEHPA@PAN and TBP@PAN were prepared using the electrospinning technique. The morphology, surface charge, and functional components were characterized with SEM–EDS, Zeta potential and FT-IR. Batch experiments were conducted to investigate uranium adsorption performance, with adsorption isotherms, kinetics, and thermodynamics analyzed. DFT calculations were used to elucidate the interaction mechanisms between DEHPA or TBP with uranium. The results showed that DEHPA@PAN exhibited superior uranium adsorption capacity compared to TBP@PAN. Conversely, the latter has a higher cyclicality than the former. Van der Waals forces and electrostatic attraction were dominative in the interaction between PAN and DEHPA or TBP. The investigation offers novel perspectives on the use of advanced nanofiber sorbents to mitigate uranium pollution in water systems and emphasizes their suitability for repeated applications.