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Author response for "Photoaging alters the aggregation behavior of functionalized-nanoplastics differently：Effects of leached organic matter and surface properties changing"
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Photoaging alters the aggregation behavior of functionalized nanoplastics differently: effects of leached organic matter and surface properties changes
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This study found that UV photoaging of nanoplastics changes their surface chemistry and causes them to release organic compounds, but the downstream effect on how particles clump together (aggregation) differs markedly depending on what chemical groups are on the particle surface. This matters because aggregation behaviour controls whether nanoplastics sink or stay suspended in water, affecting which organisms are exposed and how far the particles travel.
Environmental Science Nano: Back cover
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Photoaging alters the surface properties and organic matter leaching of functionalized nanoplastics, which in turn changes how they aggregate in aquatic environments. Understanding these aggregation dynamics is critical for predicting the transport, bioavailability, and toxicity of nanoplastics in real-world conditions.
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.
Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene
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Researchers investigated how photoaging affects the aggregation behavior of polystyrene nanoplastics with suspended sediments in water. They found that 30 days of photoaging retarded aggregation in sodium chloride solutions due to steric hindrance from leached organic matter, but promoted aggregation in calcium chloride solutions through calcium bridging of newly formed oxygen-containing surface groups. The study provides mechanistic insights into how environmental weathering changes the transport and fate of nanoplastics in aquatic systems.
Exposure Order to Photoaging and Humic Acids Significantly Modifies the Aggregation and Transformation of Nanoplastics in Aqueous Solutions
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Researchers discovered that the order in which nanoplastics are exposed to sunlight and natural organic matter significantly changes how they clump together and behave in water. Nanoplastics aged by sunlight before encountering humic acids behaved differently than those exposed in the reverse order. This finding is important for predicting how nanoplastics actually move and persist in real-world water environments.
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