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<p>Cobalt-based metal–organic frameworks (Co-MOFs) have shown great promise as catalysts in sulfate radical-based advanced oxidation processes (SR-AOPs) for wastewater treatment. In this study, a new and stable Co-MOF, {[Co(C₈H₄O₅) (C₁₂H₈N₂)] · (H₂O)} <sub>n</sub> was synthesized via a solvothermal method using 5-hydroxyisophthalic acid and o-phenanthroline as ligands. The structure of the Co-MOF was characterized by single-crystal X-ray diffraction (SCXRD), infrared spectroscopy (IR), powder X-ray diffraction (PXRD), and thermogravimetric analysis (TG). SCXRD revealed a three-dimensional network formed through π-π stacking and hydrogen bonding interactions. The Co-MOF exhibited exceptional catalytic performance in activating peroxymonosulfate (PMS) for the degradation of methylene blue (MB) and rhodamine B (RB). Using only 10&#xa0;mg of catalyst, at 25&#xa0;°C, methylene blue (MB) and rhodamine B (RB) at an initial concentration of 50&#xa0;mg/L were degraded by 97% (K = 2.14&#xa0;min⁻<sup>1</sup>) and 98% (K = 1.01&#xa0;min⁻<sup>1</sup>) respectively within 10&#xa0;min under the action of 30&#xa0;mg and 40&#xa0;mg PMS. Furthermore, systematic studies of degradation conditions showed that this catalyst exhibited excellent catalytic degradation performance under both acidic and neutral conditions. Active species trapping experiments indicated that singlet oxygen (<sup>1</sup>O₂) played a predominant role in the degradation mechanism; However, Superoxide radicals (O₂·⁻) and hydroxyl radicals (·OH) also contributed to this process. The Co-MOF displayed excellent stability and reusability, maintaining a degradation efficiency exceeding 90% after five consecutive cycles. This study underscores the potential of the Co-MOF as a highly efficient and stable catalyst for PMS activation in organic dye degradation, presenting a promising solution for treating dye-contaminated wastewater.</p> Graphical Abstract <p></p>

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A New Cobalt-Based Metal–Organic Framework as an Efficient Peroxymonosulfate Activator for Degrading Methylene Blue and Rhodamine B

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Yu-Si He,
  • Yu-Qi Liu,
  • Xin-Ying Wang,
  • Bai-Zhuang Li,
  • Biao Li,
  • Yu-Feng Zhang,
  • Yue-Bin Feng,
  • Bin-Fang Meng,
  • Huilong Luo,
  • Wei Li

摘要

Cobalt-based metal–organic frameworks (Co-MOFs) have shown great promise as catalysts in sulfate radical-based advanced oxidation processes (SR-AOPs) for wastewater treatment. In this study, a new and stable Co-MOF, {[Co(C₈H₄O₅) (C₁₂H₈N₂)] · (H₂O)} n was synthesized via a solvothermal method using 5-hydroxyisophthalic acid and o-phenanthroline as ligands. The structure of the Co-MOF was characterized by single-crystal X-ray diffraction (SCXRD), infrared spectroscopy (IR), powder X-ray diffraction (PXRD), and thermogravimetric analysis (TG). SCXRD revealed a three-dimensional network formed through π-π stacking and hydrogen bonding interactions. The Co-MOF exhibited exceptional catalytic performance in activating peroxymonosulfate (PMS) for the degradation of methylene blue (MB) and rhodamine B (RB). Using only 10 mg of catalyst, at 25 °C, methylene blue (MB) and rhodamine B (RB) at an initial concentration of 50 mg/L were degraded by 97% (K = 2.14 min⁻1) and 98% (K = 1.01 min⁻1) respectively within 10 min under the action of 30 mg and 40 mg PMS. Furthermore, systematic studies of degradation conditions showed that this catalyst exhibited excellent catalytic degradation performance under both acidic and neutral conditions. Active species trapping experiments indicated that singlet oxygen (1O₂) played a predominant role in the degradation mechanism; However, Superoxide radicals (O₂·⁻) and hydroxyl radicals (·OH) also contributed to this process. The Co-MOF displayed excellent stability and reusability, maintaining a degradation efficiency exceeding 90% after five consecutive cycles. This study underscores the potential of the Co-MOF as a highly efficient and stable catalyst for PMS activation in organic dye degradation, presenting a promising solution for treating dye-contaminated wastewater.

Graphical Abstract