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Dissolved organic matter inhibit the degradation process of polystyrene nanoplastic under utraviolet light
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Scientists found that natural organic matter in water (like from plants and soil) slows down the breakdown of tiny plastic particles when exposed to sunlight. This means these microscopic plastics could stick around longer in lakes, rivers, and oceans before breaking down naturally. Since we're still learning how these long-lasting tiny plastics might affect human health through drinking water and food, this discovery helps us better understand what happens to plastic pollution in the environment.
Nanoplastics (NPs) have higher surface energy and reactivity due to their nano-scale effects, but there is still uncertainty about the impact of dissolved organic matter (DOM) commonly in the environment on the photoaging process of NPs. This study investigates the ROS photogeneration process of polystyrene nanoplastics (PSNPs) in the presence of DOM under UV irradiation. Our results show that the addition of DOM inhibits the photoreactivity of PSNPs, as evidenced by a smaller reduction in particle size and a decreased abundance of oxygen-containing functional groups on the PSNPs surface. The inhibition mechanism involves light shielding and quenching effects, with lower singlet oxygen (O) and superoxide radical (O) formation when DOM and PSNPs are mixed. The quenching of triplet states (PSNPs* and DOM*) prevents efficient energy transfer to oxygen, thus lowering O formation. Additionally, O reacts with DOM's C-H bonds to form hydroperoxide or peroxy radicals, further decreasing ROS production. The photogeneration mechanism of the interaction between PSNPs and DOM is proposed for the first time from the point of view of energy transfer and electron transfer. This study provides a deep understanding of the photoreactivity of PSNPs in natural water environment under UV irradiation and emphasizes the role of DOM.
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Combined effects of photoaging and natural organic matter on the colloidal stability of nanoplastics in aquatic environments
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Researchers found that photoaging of polystyrene nanoplastics alters how natural organic matter interacts with their surfaces — reducing humic acid adsorption while increasing protein adsorption — with downstream effects on the nanoplastics' stability and transport in aquatic environments.
Structure-dependent regulation of nanoplastic uptake by humic substances in a freshwater protozoan
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Scientists found that natural organic matter in lake and river water—stuff that comes from decomposing plants and leaves—can block tiny plastic particles from being absorbed by microorganisms, sometimes by nearly 100%. This matters because it shows that the plastic pollution risks we see in clean lab water might not fully reflect what happens in real rivers and lakes, where natural compounds could be quietly protecting aquatic life (and potentially reducing how much plastic moves up the food chain toward us).
Photochemistry of microplastics-derived dissolved organic matter: Reactive species generation and organic pollutant degradation
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Researchers investigated how dissolved organic matter released from degrading polystyrene and PVC microplastics behaves when exposed to sunlight in water. They found that sunlight breaks down the aromatic compounds in this plastic-derived material and generates reactive chemical species, though at lower rates than natural organic matter. Despite this, these reactive species significantly accelerated the breakdown of co-existing pollutants, suggesting that degrading microplastics may act as unexpected natural catalysts in aquatic environments.
Dissolved Organic Matter Promotes the Aging Process of Polystyrene Microplastics under Dark and Ultraviolet Light Conditions: The Crucial Role of Reactive Oxygen Species
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Researchers found that dissolved organic matter commonly present in natural water environments accelerates the aging and degradation of polystyrene microplastics under both dark and ultraviolet light conditions. The study identified reactive oxygen species as the crucial driver of this aging process, with fulvic acid showing a stronger effect than humic acid due to its greater ability to generate semiquinone radicals.
Natural Organic Matter Stabilizes Pristine Nanoplastics but Destabilizes Photochemical Weathered Nanoplastics in Monovalent Electrolyte Solutions
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This study examined how sunlight weathering and natural organic matter coatings change the behavior of nanoplastics in water. Researchers found that organic matter stabilizes fresh nanoplastics but actually destabilizes sun-weathered ones, meaning aged nanoplastics in natural waters may clump together and settle differently than expected, affecting where they end up in aquatic environments.
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