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<p>This work explores novel ZIF-8 adsorbents functionalized with -COOH and -NH<sub>2</sub> groups to achieve efficient U(VI) separation. The morphology and other characteristics of the adsorption materials were characterized. The material demonstrated a high equilibrium capacity of 1043&#xa0;mg/g within 5&#xa0;min at pH = 4 and an initial uranium concentration of 100&#xa0;ppm, along with excellent selectivity. The adsorption process was spontaneous and entropy-driven via chemisorption. X-ray photoelectron spectroscopy and Density Functional Theory revealed amide bond formation as the main adsorption mechanism. These findings highlight the potential of this material for U(VI) recovery from waste solutions, offering promising environmental applications.</p>

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Investigation of amide-functionalized ZIF-8 for rapid, selective, and efficient uranium extraction

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Fuqiu Ma,
  • Xiaoli Su,
  • Yunyang Gui,
  • Shupeng Ma,
  • Kang Yang,
  • Qizi Wu,
  • Mingbo Ji,
  • Guixiang Wang,
  • Sheng Wu

摘要

This work explores novel ZIF-8 adsorbents functionalized with -COOH and -NH2 groups to achieve efficient U(VI) separation. The morphology and other characteristics of the adsorption materials were characterized. The material demonstrated a high equilibrium capacity of 1043 mg/g within 5 min at pH = 4 and an initial uranium concentration of 100 ppm, along with excellent selectivity. The adsorption process was spontaneous and entropy-driven via chemisorption. X-ray photoelectron spectroscopy and Density Functional Theory revealed amide bond formation as the main adsorption mechanism. These findings highlight the potential of this material for U(VI) recovery from waste solutions, offering promising environmental applications.