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<p>Metal–organic framework (MOF) has gained widespread attention as potential adsorbents for the removal of methylmercury (CH<sub>3</sub>Hg<sup>+</sup>). This study synthesizes a defective MIL-88A(Fe) (D-MIL-88A(Fe)) from waste polyethylene terephthalate (PET). Structural characterization via XRD, SEM, N<sub>2</sub> adsorption–desorption, and FT-IR confirmed the crystalline MIL-88A(Fe) framework with hierarchical porosity (0.6&#xa0;nm micropores and 1.95&#xa0;nm mesopores) and retained carboxyl/Fe–O functional groups, enhancing mass transfer and adsorption accessibility. Adsorption equilibrium studies revealed 93.4% CH<sub>3</sub>Hg<sup>+</sup> removal with a maximum adsorption capacity of 4.91&#xa0;mg/g (Langmuir model), indicating monolayer adsorption dominated by physical interactions. Kinetic analysis demonstrated ultrafast removal (90% within 500&#xa0;min, <i>k</i><sub>1</sub> = 0.0076&#xa0;min<sup>−1</sup>), aligning with pseudo-first-order kinetics. The material exhibited robust regeneration, retaining &gt; 90% efficiency after five cycles. By utilizing discarded PET as a low-cost ligand source, this work not only reduces MOF production costs but also offers a dual solution for CH<sub>3</sub>Hg⁺-contaminated wastewater remediation and plastic waste value assessment.</p>

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Defective iron-based metal–organic framework derived from discarded plastics for rapid and efficient adsorptive removal of methylmercury

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Yitong Chen,
  • Zhouheng Xia,
  • Xiaojing Zhou,
  • Na Ma,
  • Wei Dai

摘要

Metal–organic framework (MOF) has gained widespread attention as potential adsorbents for the removal of methylmercury (CH3Hg+). This study synthesizes a defective MIL-88A(Fe) (D-MIL-88A(Fe)) from waste polyethylene terephthalate (PET). Structural characterization via XRD, SEM, N2 adsorption–desorption, and FT-IR confirmed the crystalline MIL-88A(Fe) framework with hierarchical porosity (0.6 nm micropores and 1.95 nm mesopores) and retained carboxyl/Fe–O functional groups, enhancing mass transfer and adsorption accessibility. Adsorption equilibrium studies revealed 93.4% CH3Hg+ removal with a maximum adsorption capacity of 4.91 mg/g (Langmuir model), indicating monolayer adsorption dominated by physical interactions. Kinetic analysis demonstrated ultrafast removal (90% within 500 min, k1 = 0.0076 min−1), aligning with pseudo-first-order kinetics. The material exhibited robust regeneration, retaining > 90% efficiency after five cycles. By utilizing discarded PET as a low-cost ligand source, this work not only reduces MOF production costs but also offers a dual solution for CH3Hg⁺-contaminated wastewater remediation and plastic waste value assessment.