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<p>This study addresses the dual environmental challenges of plastic waste accumulation and pesticide contamination by upcycling post-consumer Polyethylene Terephthalate (PET) into high-performance Metal–Organic Frameworks (MOFs). Waste PET was converted into terephthalic acid (TPA) via acid hydrolysis to serve as the organic linker for the synthesis of a Manganese-based MOF (MOF-Mn) using hydrothermal and solvothermal methods. The resulting porous framework was evaluated for the removal of Thiophanate-methyl, a systemic fungicide and probable human carcinogen, from aqueous solutions. Structural and morphological properties were confirmed through Infrared Spectroscopy (IR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). FTIR results indicated successful interaction between the Mn-MOF and Thiophanate-methyl and confirmed the structural stability after reusability. PXRD analysis showed that both Mn-BDC(s) and Mn-BDC(h) exhibit well-defined crystalline structures, confirming successful MOF formation. SEM analysis showed well-defined morphology for both Mn-BDC(s) and Mn-BDC(h), while EDX confirmed the elemental composition and homogeneous distribution of Mn within the framework. Adsorption experiments were conducted to assess the influence of contact time and initial adsorbate concentration on removal efficiency. This work demonstrates a sustainable 'waste-to-value' approach, providing a circular economy solution for plastic waste while offering an effective platform for the remediation of hazardous pesticides in water treatment. The Mn-MOF synthesized via hydrothermal and solvothermal methods exhibited maximum adsorption capacities of 197.2 mg/g and 185.0 mg/g, respectively. In both cases, the adsorption kinetics were well-described by the pseudo-second-order model, suggesting a chemisorption-controlled process.</p>

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Upcycling Polyethylene Terephthalate Waste into Manganese-Based Metal–Organic Frameworks for the Efficient Adsorption of Thiophanate-Methyl from Wastewater

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Amr Mahrous,
  • Fatma M. Elantabli,
  • Samir M. El-Medani,
  • Reda M. Abdelhameed

摘要

This study addresses the dual environmental challenges of plastic waste accumulation and pesticide contamination by upcycling post-consumer Polyethylene Terephthalate (PET) into high-performance Metal–Organic Frameworks (MOFs). Waste PET was converted into terephthalic acid (TPA) via acid hydrolysis to serve as the organic linker for the synthesis of a Manganese-based MOF (MOF-Mn) using hydrothermal and solvothermal methods. The resulting porous framework was evaluated for the removal of Thiophanate-methyl, a systemic fungicide and probable human carcinogen, from aqueous solutions. Structural and morphological properties were confirmed through Infrared Spectroscopy (IR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). FTIR results indicated successful interaction between the Mn-MOF and Thiophanate-methyl and confirmed the structural stability after reusability. PXRD analysis showed that both Mn-BDC(s) and Mn-BDC(h) exhibit well-defined crystalline structures, confirming successful MOF formation. SEM analysis showed well-defined morphology for both Mn-BDC(s) and Mn-BDC(h), while EDX confirmed the elemental composition and homogeneous distribution of Mn within the framework. Adsorption experiments were conducted to assess the influence of contact time and initial adsorbate concentration on removal efficiency. This work demonstrates a sustainable 'waste-to-value' approach, providing a circular economy solution for plastic waste while offering an effective platform for the remediation of hazardous pesticides in water treatment. The Mn-MOF synthesized via hydrothermal and solvothermal methods exhibited maximum adsorption capacities of 197.2 mg/g and 185.0 mg/g, respectively. In both cases, the adsorption kinetics were well-described by the pseudo-second-order model, suggesting a chemisorption-controlled process.