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<p>An NZVI@MOF composite was synthesized via liquid-phase reduction and ambient-temperature precipitation, which not only mitigates NZVI agglomeration but also significantly increases the active sites. Under optimized conditions (pH = 6.0, initial U(VI) concentration of 80&#xa0;mg&#xa0;L<sup>−1</sup>), the as-synthesized NZVI@MOF composite achieved a maximum adsorption capacity of 349&#xa0;mg&#xa0;g<sup>−1</sup> and a removal efficiency of 96%, outperforming pristine NZVI, MOFs, and conventional adsorbents (e.g., zeolites and activated carbon) via an “adsorption-reduction” synergistic mechanism. Kinetic studies revealed that the adsorption conforms to a pseudo-second-order model, while the Freundlich isotherm model indicated a heterogeneous multilayer chemisorption mechanism. These findings highlight the NZVI@MOF composite as a promising material for radioactive wastewater treatment.</p>

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Synthesis of NZVI@MOF composite for efficient U(VI) removal from aqueous solution

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Baiming Liang,
  • Yuguo Hu,
  • Jiajun Zeng,
  • Yu Liang,
  • Wenli Xu,
  • Yu Wang,
  • Pengfei Yang,
  • Jingjing Li,
  • Chongxiong Duan

摘要

An NZVI@MOF composite was synthesized via liquid-phase reduction and ambient-temperature precipitation, which not only mitigates NZVI agglomeration but also significantly increases the active sites. Under optimized conditions (pH = 6.0, initial U(VI) concentration of 80 mg L−1), the as-synthesized NZVI@MOF composite achieved a maximum adsorption capacity of 349 mg g−1 and a removal efficiency of 96%, outperforming pristine NZVI, MOFs, and conventional adsorbents (e.g., zeolites and activated carbon) via an “adsorption-reduction” synergistic mechanism. Kinetic studies revealed that the adsorption conforms to a pseudo-second-order model, while the Freundlich isotherm model indicated a heterogeneous multilayer chemisorption mechanism. These findings highlight the NZVI@MOF composite as a promising material for radioactive wastewater treatment.