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<p>A novel adsorbent, Mn-MOF-74, was synthesized using a room-temperature, water-based method by assembling Mn<sup>2+</sup> metal nodes with 2,5-dihydroxyterephthalic acid ligands, and was further applied for Co<sup>2+</sup> removal. Mn-MOF-74 exhibited minimal pH dependence within a pH range of 3–8.5, achieving Co<sup>2+</sup> removal efficiencies between 92.5 and 96.3%, with a distribution coefficient of up to 2.9 × 10<sup>4</sup>&#xa0;mL·g<sup>−1</sup>. A function relationship between the Co<sup>2+</sup> removal efficiency and the adsorbent dosage or initial concentration was proposed. The dominant removal mechanism was identified as ion exchange between Mn<sup>2+</sup> and Co<sup>2+</sup>, with chemisorption being the primary rate-limiting step.</p>

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Effective removal of cobalt from aqueous solution by Mn-MOF-74 synthesized using room-temperature, water-based synthesis method

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Xinying Liu,
  • Yuhan Lei,
  • Jialin Shi,
  • Zixuan Wang,
  • Wenxiu Zhang,
  • Guanghui Zhang,
  • Ping Gu

摘要

A novel adsorbent, Mn-MOF-74, was synthesized using a room-temperature, water-based method by assembling Mn2+ metal nodes with 2,5-dihydroxyterephthalic acid ligands, and was further applied for Co2+ removal. Mn-MOF-74 exhibited minimal pH dependence within a pH range of 3–8.5, achieving Co2+ removal efficiencies between 92.5 and 96.3%, with a distribution coefficient of up to 2.9 × 104 mL·g−1. A function relationship between the Co2+ removal efficiency and the adsorbent dosage or initial concentration was proposed. The dominant removal mechanism was identified as ion exchange between Mn2+ and Co2+, with chemisorption being the primary rate-limiting step.