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20 resultsShowing papers similar to How Heavy Metals Influence Microplastic Degradation: UV Absorption and Photoreactivity of Ps-fe₃o₄ Composites
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.
UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
Researchers studied how UV weathering alters the heteroaggregation and sedimentation behaviour of 1-micrometre polystyrene microplastic particles with ferrihydrite (an iron oxy-hydroxide common in natural waters). They found that UV weathering changed the surface charge and properties of polystyrene particles, significantly affecting their aggregation with ferrihydrite at neutral pH and their subsequent removal from the water column by sedimentation.
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.
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.
Phototransformation of microplastic derived dissolved organic matter reduces its adsorption capacity on ferrihydrite: Effects of additive types
Researchers studied how sunlight-driven phototransformation of dissolved organic matter released by microplastics affects its ability to bind to iron minerals in sediments. The study found that phototransformation significantly reduced the adsorption capacity of microplastic-derived organic matter on ferrihydrite, with the type of plastic additive playing a key role in determining the extent of this change.
Sorption Behavior, Speciation, and Toxicity of Microplastic-Bound Chromium in Multisolute Systems
Researchers investigated how UV filters affect chromium sorption and toxicity on polystyrene microplastics, finding that UV irradiation and co-contaminants alter metal speciation and increase the ecological risk of microplastic-bound heavy metals.
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.
Photoaging mechanisms of microplastics mediated by dissolved organic matter in an iron-rich aquatic environment
Researchers investigated how dissolved organic matter and iron mediate the photoaging of PVC and PET microplastics, finding that humic acid and iron accelerate surface degradation and alter the environmental behavior and risks of aged microplastics.
Polystyrene microplastics enhance oxidative dissolution but suppress the aquatic acute toxicity of a commercial cadmium yellow pigment under simulated irradiation
Researchers studied how polystyrene microplastics affect the stability and toxicity of cadmium yellow pigment in water exposed to simulated sunlight. They found that the microplastics actually increased the dissolution of the pigment by generating reactive chemical species, but paradoxically reduced its acute toxicity to aquatic organisms. The study reveals that microplastics can alter the environmental behavior of co-existing pollutants in unexpected ways.
Polystyrene microplastics sunlight-induce oxidative dissolution, chemical transformation and toxicity enhancement of silver nanoparticles
Researchers discovered that polystyrene microplastics can induce sunlight-driven oxidative dissolution and chemical transformation of silver nanoparticles, enhancing their toxicity and revealing important implications for how co-occurring pollutants interact in the environment.
Zinc oxide nanoparticles dissolution and toxicity enhancement by polystyrene microplastics under sunlight irradiation
Researchers found that polystyrene microplastics dramatically increased the sunlight-induced dissolution of zinc oxide nanoparticles, enhancing the release of toxic zinc ions and reactive oxygen species in aquatic environments.
Aged Polystyrene Microplastics Accelerate the Photo-Reduction of Chromium(VI)
Researchers investigated how aged polystyrene microplastics interact with hexavalent chromium, a toxic heavy metal, in water under light conditions. They found that microplastics accelerate the conversion of toxic chromium(VI) to less harmful chromium(III), while the chromium in turn speeds up the aging of the microplastics. The study reveals a complex interplay between microplastics and heavy metals in aquatic environments that could influence the environmental fate of both pollutants.
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.
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.
New insights on metal ions accelerating the aging behavior of polystyrene microplastics: Effects of different excess reactive oxygen species
The aging behavior of polystyrene microplastics was investigated in the presence of copper and lead ions, finding that both metals accelerated surface oxidation through generation of reactive oxygen species, with copper producing stronger effects. The study reveals that heavy metal co-contamination can substantially alter the weathering trajectory of microplastics in natural environments.
Microplastic degradations in simulated UV light, natural light and natural water body: A comparison investigation
Researchers compared how microplastics made of PVC, polyethylene, and polyamide break down under UV light, natural sunlight, and real-world water body conditions, finding that natural environments cause more complex degradation involving both biofilm growth and heavy metal interactions. Importantly, microplastics in natural water can both release and re-absorb heavy metals over time, complicating their environmental risk profile.
Insight into the Photodegradation of Microplastics Boosted by Iron (Hydr)oxides
Iron (hydr)oxide minerals goethite and hematite were found to significantly accelerate the photodegradation of polyethylene and polypropylene microplastics under simulated sunlight, with goethite showing greater effect due to higher hydroxyl radical production via a light-driven Fenton reaction. The study reveals a previously overlooked natural mechanism by which common soil minerals can influence the environmental fate of microplastics.
Promoted photodegradation of cadmium pigment-embedded microplastics: Role of reactive microenvironment
Researchers studied how cadmium pigments embedded in microplastics influence their photodegradation behavior in polystyrene, polypropylene, and polyethylene. The study found that the reactive microenvironment generated by cadmium pigments significantly accelerated plastic degradation, particularly in polystyrene, and that this accelerated breakdown correlated with increased release of toxic cadmium ions into the surrounding water.
Microplastic removal from urban stormwater: Current treatments and research gaps
Researchers investigated the phototransformation of polystyrene microplastics under simulated solar radiation, finding surface oxidation and formation of carbonyl groups after UV exposure. Photo-aged particles showed increased release of dissolved organic carbon and greater toxicity to marine copepods.
Plastic litter fate and contaminant transport within the urban environment, photodegradation, fragmentation, and heavy metal uptake from storm runoff
Researchers studied how plastic litter in urban environments degrades into microplastics through sun exposure and examined the capacity of these fragments to absorb heavy metals from stormwater runoff. The study found that photodegradation of polyethylene and PET creates microplastic fragments that can then pick up heavy metal contaminants from urban runoff, compounding their environmental impact.