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Enhanced photodegradation of polyethylene microplastics via tea polyphenol-hematite complex: critical role of a light-driven Fenton-like cascade initiated by ligand-to-metal charge transfer
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Enhanced photodegradation of polyethylene microplastics via tea polyphenol-hematite complex: Critical role of a light-driven Fenton-like cascade initiated by ligand-to-metal charge transfer
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Researchers created a composite photocatalytic material by coupling tea polyphenols with hematite iron oxide, which under visible light triggers a self-regenerating Fenton-like reaction that continuously produces hydroxyl radicals, achieving highly efficient degradation of polyethylene microplastics and offering a sustainable, solar-driven remediation strategy using widely available natural materials.
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Iron (hydr)oxide minerals goethite and hematite were found to significantly accelerate the photodegradation of polyethylene and polypropylene microplastics under simulated sunlight, with goethite showing greater effect due to higher hydroxyl radical production via a light-driven Fenton reaction. The study reveals a previously overlooked natural mechanism by which common soil minerals can influence the environmental fate of microplastics.
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