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<p>The efficient extraction of uranium from seawater is crucial for the sustainable development of nuclear energy. Nevertheless, creating practical high-performance adsorbents is still difficult. In this work, an adsorbent (PAO-pSer) with a matrix consisting of modified hydrophilic amidoxime phosphate and oxime functional groups with high concentrations was synthesized. With a maximum adsorption capacity of 227.27 mg·g<sup>−1</sup>, PAO-pSer reaches adsorption equilibrium in about 100&#xa0;min (pH = 5.0, 298&#xa0;K, <i>C</i><sub>0</sub> = 50&#xa0;ppm). With an adsorption rate of over 95%, it retains good stability and reusability even after six cycles of adsorption and desorption. Using DFT and XPS, we carried out comprehensive mechanistic studies on the uranium adsorption by PAO-pSer. The findings demonstrated that the material’s phosphorus oxygen groups (P–O, P = O), oxime groups (–C(NH<sub>2</sub>) = N–OH), and carboxyl groups (–COOH) worked in concert to greatly improve the material’s ability to adsorb U(VI). In simulated seawater with several metal ions present, PAO-pSer shows excellent uranyl ion adsorption capacity (24.99 mg·g<sup>−1</sup>), selectivity, and affinity (<i>K</i><sub>d</sub> = 9.13 × 10<sup>4</sup>). After 25&#xa0;days of dynamic adsorption in natural seawater, it achieves a U(VI) adsorption capacity of 3.89 mg·g<sup>−1</sup>. This study offers concepts and methods for designing materials that recover uranium from seawater.</p>

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Serine phosphate-amidoxime bifunctional gel adsorbent for highly selective uranium recovery from seawater

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Lihua Zuo,
  • Zhenzhen Xu,
  • Faliang Li,
  • Mingbiao Luo

摘要

The efficient extraction of uranium from seawater is crucial for the sustainable development of nuclear energy. Nevertheless, creating practical high-performance adsorbents is still difficult. In this work, an adsorbent (PAO-pSer) with a matrix consisting of modified hydrophilic amidoxime phosphate and oxime functional groups with high concentrations was synthesized. With a maximum adsorption capacity of 227.27 mg·g−1, PAO-pSer reaches adsorption equilibrium in about 100 min (pH = 5.0, 298 K, C0 = 50 ppm). With an adsorption rate of over 95%, it retains good stability and reusability even after six cycles of adsorption and desorption. Using DFT and XPS, we carried out comprehensive mechanistic studies on the uranium adsorption by PAO-pSer. The findings demonstrated that the material’s phosphorus oxygen groups (P–O, P = O), oxime groups (–C(NH2) = N–OH), and carboxyl groups (–COOH) worked in concert to greatly improve the material’s ability to adsorb U(VI). In simulated seawater with several metal ions present, PAO-pSer shows excellent uranyl ion adsorption capacity (24.99 mg·g−1), selectivity, and affinity (Kd = 9.13 × 104). After 25 days of dynamic adsorption in natural seawater, it achieves a U(VI) adsorption capacity of 3.89 mg·g−1. This study offers concepts and methods for designing materials that recover uranium from seawater.