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<p>With the rapid expansion of the nuclear industry and growing emphasis on sustainable development, the extraction of uranium from seawater has garnered significant attention. Consequently, the development of highly efficient uranium adsorbent materials has become an urgent priority. This study delved deeply into the impact of regulating the surface positive charge density of layered double hydroxides (LDHs) on uranium extraction performance, using the LDHs-(Zn/Al) system as the subject of research for a series of systematic studies. The investigation selected Zn<sup>2+</sup> and Al<sup>3+</sup> as the layer cation combinations. By precisely regulating the Zn/Al molar ratio (ranging from 2:1 to 6:1) in the precursor, a series of LDHs-(Zn/Al) with regular crystal structures were successfully synthesized, and the layer composition was gradually adjusted. Adsorption experiments revealed that the maximum uranium extraction capacity in simulated seawater reached 31.15&#xa0;mg/g. Furthermore, against a seawater backdrop, when the uranium concentration ranged from 3.3 to 100&#xa0;ppb, the solid–liquid ratio is 0.25&#xa0;g/L, and the uranium extraction efficiency exceeds 95%. These outstanding experimental outcomes suggest that this study offers a novel design strategy for creating efficient and stable uranium extraction materials from seawater, holding significant theoretical implications and practical potential.</p>

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Efficient uranium extraction by regulating the surface positive charge density of layered materials

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Ziyang Wang,
  • Chao Jiang,
  • Huilian Mo,
  • Siyi Wang,
  • Jing Wang,
  • Jingyu Yu,
  • Suwen Chen

摘要

With the rapid expansion of the nuclear industry and growing emphasis on sustainable development, the extraction of uranium from seawater has garnered significant attention. Consequently, the development of highly efficient uranium adsorbent materials has become an urgent priority. This study delved deeply into the impact of regulating the surface positive charge density of layered double hydroxides (LDHs) on uranium extraction performance, using the LDHs-(Zn/Al) system as the subject of research for a series of systematic studies. The investigation selected Zn2+ and Al3+ as the layer cation combinations. By precisely regulating the Zn/Al molar ratio (ranging from 2:1 to 6:1) in the precursor, a series of LDHs-(Zn/Al) with regular crystal structures were successfully synthesized, and the layer composition was gradually adjusted. Adsorption experiments revealed that the maximum uranium extraction capacity in simulated seawater reached 31.15 mg/g. Furthermore, against a seawater backdrop, when the uranium concentration ranged from 3.3 to 100 ppb, the solid–liquid ratio is 0.25 g/L, and the uranium extraction efficiency exceeds 95%. These outstanding experimental outcomes suggest that this study offers a novel design strategy for creating efficient and stable uranium extraction materials from seawater, holding significant theoretical implications and practical potential.