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Morphology-dependent photoaging behavior of polyamide fibrous microplastics: implications for fragmentation and dissolved organic matter release
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Nylon microfibers (like those shed from clothing) don't just sit around in the ocean—sunlight causes them to crack and peel apart lengthwise, breaking into even smaller plastic fragments while also leaching protein-like chemicals into the water. Interestingly, salt in seawater actually slows this breakdown, meaning these fibers may stick around longer in coastal waters than expected, raising questions about long-term exposure for marine life and, potentially, the seafood we eat.
Fibrous microplastics (FMPs) are ubiquitous yet structurally distinct contaminants in marine ecosystems, characterized by high aspect ratios that potentially dictate their environmental fate. This study elucidates the photo-induced evolution of polyamide microfibers, revealing a morphology-governed degradation evidence. Our results demonstrate that FMPs undergo anisotropic photo-deconstruction, characterized by longitudinal cracking and hierarchical peeling, driven by the orientation of polymer chains. This process releases 3.9 × 10 particles/L (>10 μm) after 480 h of simulated solar irradiation. Concurrently, a significant molecular divergence of dissolved organic matter occurs, with the preferential leaching of protein-like components over humic-like substances. While seawater halides exert a shielding effect that retards physical fragmentation, it prolongs the environmental residence time of aged fibers. These findings provide mechanistic insights into the physicochemical transformation of polyamide fibrous microplastics during photoaging and highlight the importance of fiber morphology and aquatic chemistry in regulating microplastic degradation and secondary particle release in coastal environments.
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Photo aging of polyester microfiber in freshwater and seawater environments: kinetics, mechanisms, and influencing factors
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UV aging of polyester (PET) microfibers accelerates faster in seawater than in freshwater, driven by reactive ions like nitrate, bromide, and chloride. This matters because faster aging in marine environments means PET microfibers — the most abundant microplastic in aquatic systems — break down more rapidly into smaller, potentially more bioavailable nanoplastic fragments in the ocean.
Photoaging of four microplastics under diverse conditions: characteristics and leachate composition studies.
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Sunlight breaks down common plastics (like those in food packaging and textiles) into smaller fragments while also causing them to leach chemicals and additives into water — and this process speeds up significantly when extra oxidants are present, mimicking real-world water treatment or natural conditions. Different plastic types released different amounts and mixes of these chemical byproducts, with nylon (PA) releasing especially high levels of dissolved substances, suggesting that as microplastics age in the environment, they may become an even more complex source of chemical exposure than previously thought.
Microplastic particle versus fiber generation during photo-transformation in simulated seawater
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Researchers exposed common plastic films and fibers to simulated sunlight in seawater and tracked the photo-transformation process, finding that particles and fibers formed at different rates and that UV irradiation preferentially generates certain morphologies depending on the parent polymer.
Photodegradation Processes and Weathering Products of Microfibers in Aquatic Environments
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Researchers conducted photodegradation experiments on three common microfiber types — polyester, nylon, and acrylic — to understand how they break down in aquatic environments under light exposure. They documented changes in surface morphology, polymer structure, and chemical properties over time, finding that each fiber type followed distinct degradation pathways. The study provides important insights into the environmental fate and secondary pollution potential of textile-derived microfibers.
Microplastic fibres from synthetic textiles: Environmental degradation and additive chemical content
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Researchers studied how common synthetic textile fibers — polyester, polyamide, and polyacrylonitrile — degrade in seawater and freshwater under UV light exposure. They found that these fibers release chemical additives as they break down, with polyester and polyamide releasing particularly concerning levels of plastic-related chemicals into the surrounding water.
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