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Photoaging process of polyethylene microplastics mediated by layered double hydroxide: Experiments and density functional theory calculations
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Photoaging mechanism of microplastics: a perspective on the effect of dissolved organic matter in natural water
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This perspective paper examines how microplastics in natural water photoage under UV irradiation via reactive oxygen species generation, breaking down polymer bonds, and explores how dissolved organic matter may accelerate or alter these aging pathways. Understanding photoaging is critical because it fragments plastics into smaller and more biologically available nanoplastics while releasing toxic chemical additives into aquatic ecosystems.
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Researchers discovered that biofilms — thin layers of microbes that naturally colonize plastic surfaces in water — actually slow down the light-driven breakdown of microplastics by blocking UV radiation and reducing the reactive oxygen species that degrade the plastic, suggesting that real-world plastics may persist longer in nature than lab studies predict.
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