Photochemical Transformation of Microplastics-derived Dissolved Organic Matter Altered the photoaging of Microplastics

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.

Unveiling the protective role of biofilm formation on the photoaging of microplastics

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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.

Photochemical Processes: Solution or Problem for Microplastics in the Environment?

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Researchers investigate photochemical processes as both a potential solution and a contributor to microplastic pollution, examining how UV-driven degradation can fragment larger plastics into nanoplastics while also exploring photocatalysis as a remediation strategy.

Kinetic study of microplastic reactivity with hydroxyl radicals: Insights into photochemical fate and transformation products

Replicating real-world microplastics with accelerated physicochemical ageing

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Researchers developed methods to artificially age microplastics in the lab so they accurately replicate the physicochemical properties of microplastics found in real-world environments. Environmentally realistic aged microplastics are essential for generating reliable toxicology data, since fresh plastic particles behave differently than weathered ones that organisms actually encounter.