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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 (DOM) originating from microplastics (MPs-DOM) is increasingly recognized as a substantial component of aquatic DOM. The photochemistry of MPs-DOM, essential for understanding its environmental fate and impacts, remains largely unexplored. This study investigates the photochemical behaviors of MPs-DOM derived from two common plastics: polystyrene (PS) and polyvinyl chloride (PVC), which represent aromatic and aliphatic plastics, respectively. Spectral and high-resolution mass spectrometry analyses demonstrated that photoreactions preferentially targeted poly-aromatic compounds within the MPs-DOM, leading to degradation products that predominantly form N-aliphatic/lipid-like substances. This transformation is characterized by decreased aromaticity and unsaturation. Additionally, irradiation of MPs-DOM generated reactive species (RS), including triplet intermediates (DOM*) and singlet oxygen (O), with apparent quantum yields of 0.06-0.16 % and 0.16-0.35 %, respectively-values considerably lower than those for conventional DOM (1.19-1.56 % for DOM* and 1.34-1.90 % for O). Despite this, the RS generated from MPs-DOM significantly enhance the degradation of coexisting organic pollutants, such as antibiotic resistance genes (ARGs). The findings shed light on the photoinduced transformation of MPs-DOM and suggest that MPs-DOM functions as a natural photocatalyst, mediating redox reactions of pollutants in sunlit aquatic settings. This highlights its previously underestimated role in natural attenuation and aquatic photochemistry.
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Photochemical reactivity of water-soluble dissolved organic matter from microplastics and microfibers
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When microplastics and microfibers sit in water, they leach dissolved organic matter (DOM) that can react with sunlight to produce reactive chemicals. This study found that the type and amount of DOM released depends heavily on polymer chemistry, with aromatic plastics like PET and polystyrene releasing more light-absorbing DOM, and microfibers releasing more DOM overall than microplastic particles. Understanding how plastic-derived DOM breaks down in sunlight is important because these chemical by-products can interact with other aquatic pollutants and affect aquatic ecosystems in ways not yet fully understood.
Phototransformation and photoreactivity of MPs-DOM in aqueous environment: Key role of MPs structure decoded by optical and molecular signatures
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Researchers investigated how dissolved organic matter released from microplastics behaves during light-driven transformation in water. They found that organic matter from benzene-containing polymers showed distinctly different photoreactivity compared to matter from polyolefin-based plastics. The study reveals that the chemical structure of the parent microplastic plays a key role in determining how its dissolved byproducts react and generate reactive species in aquatic environments.
Unraveling the role of natural and pyrogenic dissolved organic matter in photodegradation of biodegradable microplastics in freshwater
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Researchers investigated how dissolved organic matter from natural sources versus biochar affects the breakdown of biodegradable polylactic acid (PLA) microplastics in sunlight. Naturally sourced organic matter accelerated PLA degradation nearly twice as much as biochar-derived matter by generating more reactive oxygen species, suggesting that the type of organic matter in a waterway significantly influences whether biodegradable plastics actually break down.
Hydrophilic Fraction of Dissolved Organic Matter Largely Facilitated Microplastics Photoaging: Insights from Redox Properties and Reactive Oxygen Species
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This study investigated how dissolved organic matter in natural water affects the breakdown of microplastics by sunlight. The water-soluble fraction of organic matter was most effective at speeding up microplastic aging by generating reactive oxygen species that attack the plastic surface. This matters because faster breakdown of microplastics in the environment creates smaller, potentially more dangerous nanoplastic particles that can more easily enter living organisms.
Insights into the photosensitivity and photobleaching of dissolved organic matter from microplastics: Structure-activity relationship and transformation mechanism
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This study investigated the photosensitivity and photobleaching behavior of dissolved organic matter released from microplastics (MPDOM), examining how physicochemical properties of different plastics influence photoactivation and transformation. The structure-activity analysis revealed that MPDOM composition strongly determines its photoreactivity, affecting how microplastic-derived organic compounds interact with sunlight and generate reactive oxygen species in aquatic environments.
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