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20 resultsShowing papers similar to UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
ClearUV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
UV weathering of polystyrene microplastics significantly altered their surface properties, increasing heteroaggregation with ferrihydrite iron colloids and accelerating particle sedimentation compared to pristine PS—demonstrating that environmental weathering substantially changes microplastic fate and removal in aquatic systems.
Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
Researchers investigated heteroaggregation between polystyrene microplastics and ferrihydrite iron mineral particles, finding that this aggregation process leads to rapid removal of microplastic particles from the water column, with implications for understanding microplastic fate and transport in natural water systems.
Comparative effects of crystalline, poorly crystalline and freshly formed iron oxides on the colloidal properties of polystyrene microplastics
Researchers found that freshly formed iron oxides caused the greatest aggregation of polystyrene microplastics in water, with effects decreasing in the order: freshly formed iron oxide > ferrihydrite > goethite > haematite. The findings suggest that iron oxide copresence can delay microplastic transport or alter their environmental fate depending on pH and crystallinity of the mineral.
Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
Researchers found that ferrihydrite, a natural iron mineral, rapidly removes polystyrene microplastics from the water column through heteroaggregation and enhanced sedimentation, suggesting natural mineral interactions may help sequester microplastics in aquatic environments.
UV/ozone induced physicochemical transformations of polystyrene nanoparticles and their aggregation tendency and kinetics with natural organic matter in aqueous systems
Researchers weathered polystyrene nanoparticles with UV light and ozone and then tested their aggregation behavior in waters containing humic acid, lysozyme, and alginate, finding that weathering-induced oxygen-containing surface groups significantly altered aggregation kinetics in ways strongly dependent on which organic molecules were present.
Aggregation kinetics of UV irradiated nanoplastics in aquatic environments
Researchers compared the aggregation behavior of fresh versus UV-aged polystyrene nanoplastics under various aquatic conditions. They found that UV aging altered the surface chemistry of nanoplastics, making them more stable in water and less likely to aggregate, which means they could remain suspended and bioavailable for longer periods. The study suggests that weathered nanoplastics may behave very differently from fresh particles in the environment, complicating risk assessments.
UV-induced aggregation of polystyrene nanoplastics: effects of radicals, surface functional groups and electrolyte
UV irradiation was found to increase the aggregation of polystyrene nanoplastics to varying degrees depending on surface functional groups and electrolyte conditions, with free radicals playing a key role. Understanding aggregation behavior is important for predicting how nanoplastics behave and settle in aquatic environments.
How Heavy Metals Influence Microplastic Degradation: UV Absorption and Photoreactivity of Ps-fe₃o₄ Composites
Researchers examined how heavy metals, specifically iron oxide (Fe3O4), influence the UV absorption and photoreactivity of polystyrene microplastics when forming PS-Fe3O4 composite particles. The study found that iron oxide incorporation altered the photodegradation behavior of polystyrene microplastics, with implications for understanding microplastic weathering and associated pollutant release in natural environments.
Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene
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.
Crystallinity- dependent heteroaggregation and co-sedimentation between polystyrene nanoplastics and iron (hydro)oxides
Researchers found that the crystallinity of iron (hydro)oxide minerals strongly governs their tendency to aggregate with polystyrene nanoplastics in water — higher crystallinity produces more positive surface charges, stronger electrostatic attraction, and greater hydrogen bonding with nanoplastics, ultimately controlling how and where these combined particles settle in aquatic environments.
Effects of weathering on the properties and fate of secondary microplastics from a polystyrene single-use cup
Scientists studied how UV light from sunlight changes the properties of polystyrene microplastics from disposable cups. Weathering made the particles denser and less water-repellent, causing them to sink faster in water and absorb more chemical pollutants. This means older, sun-exposed microplastics in the environment may be more effective at carrying harmful chemicals into sediments where bottom-dwelling organisms live.
Impact of iron/aluminum (hydr)oxide and clay minerals on heteroaggregation and transport of nanoplastics in aquatic environment
Researchers examined how polystyrene nanoplastics interact with nine different minerals in aquatic environments, finding that positively charged iron and aluminum (hydr)oxide minerals readily form aggregates with nanoplastics through electrostatic and hydrophobic forces, while humic acid and shifting pH significantly suppress this aggregation.
Investigation of Surface Alteration of Microplastics by Using UV Irradiation
UV radiation causes polystyrene and other plastic microparticles to undergo photooxidative degradation, changing their surface chemistry and potentially making them more likely to adsorb or release chemical pollutants. Understanding these weathering processes is important for predicting the environmental behavior and toxicity of microplastics.
Coagulation studies on photodegraded and photocatalytically degraded polystyrene microplastics using polyaluminium chloride
Researchers studied how UV light exposure and photocatalytic degradation change the properties of polystyrene microplastics and affect their removal by a common water treatment chemical. They found that UV-treated microplastics developed rougher surfaces and new chemical groups that made them easier to remove through coagulation. The study suggests that understanding how weathered microplastics behave differently from fresh ones is important for optimizing water treatment processes.
Aging mechanism of microplastics with UV irradiation and its effects on the adsorption of heavy metals
Researchers aged polystyrene microplastics using UV irradiation under three conditions (air, pure water, seawater) and found that aging changed surface chemistry and increased the microplastics' capacity to adsorb heavy metals, with seawater aging producing the most pronounced surface oxidation.
Effects of size and surface charge on the sedimentation of nanoplastics in freshwater
Researchers investigated how size and surface charge of polystyrene nanoplastics affect their sedimentation behavior in freshwater, finding that both properties significantly influence aggregation dynamics and settling rates, with implications for predicting nanoplastic fate in aquatic environments.
UV-ageing effects on polystyrene microplastics surface polarity and transport in soils
Researchers found that UV sunlight exposure changes polystyrene microplastics by adding oxygen-containing groups to their surfaces, which makes the particles move differently through soil. The UV-aged particles became smaller and had altered surface charges, affecting how far they could travel through sand and soil. This matters because it shows that weathered microplastics in the environment behave differently than fresh ones, potentially reaching groundwater and other water sources more easily.
Insight into the characteristics and sorption behaviors of aged polystyrene microplastics through three type of accelerated oxidation processes
Researchers studied how three different UV-based oxidation processes age polystyrene microplastics and how that aging affects the particles' ability to absorb the chemical bisphenol A. They found that aging significantly increased the surface oxidation and water-attracting properties of the microplastics, altering their pollutant-sorbing behavior. The findings suggest that weathered microplastics in the environment may interact with chemical contaminants differently than fresh ones.
Impact of water chemistry on surface charge and aggregation of polystyrene microspheres suspensions
Researchers investigated how water chemistry factors such as pH, salt concentration, and humic acid affect the surface charge and aggregation behavior of polystyrene microspheres in aqueous solutions. The study found that higher ionic strength and lower pH promoted aggregation, while humic acid stabilized the particles, suggesting that water chemistry strongly influences the environmental fate and transport of microplastics.
Effect of UV-exposure on size, morphology, and chemical structure of polystyrene nanospheres in suspension
Researchers investigated how UV exposure changes the size, morphology, and chemical structure of polystyrene nanospheres in suspension, simulating environmental weathering of nanoplastics. The study characterized how UV aging alters particle properties in ways relevant to their biological and environmental fate.