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Impacts of microplastics on organotins’ photodegradation in aquatic environments
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Researchers found that polypropylene, polyethylene, polystyrene, and polymethyl methacrylate microplastics differentially affect the photodegradation of organotin compounds in aquatic environments, with microplastics both adsorbing organotins and altering their photolytic breakdown pathways depending on polymer type.
Microplastics are ubiquitous in natural waters and affect the environmental fate of hydrophobic organic micropollutants. This study evaluated the impacts of four microplastics, polypropylene (PP), polyethylene (PE), polystyrene (PS) and polymethyl methacrylate (PMMA), on the photodegradation of organotin compounds (OTCs) under UV irradiation (2.3 ± 0.1 W m). The experiments were performed by mixing PP, PE, PS or PMMA microparticles with tri-organotins in artificial seawater. The photodegradation of OTCs in microplastic suspensions was influenced by the absorptivity onto microplastics. The decomposition rate of tributyltin (TBT) in UV-irradiated PP suspensions was greater than trimethyltin (TMT) and triphenyltin (TPhT) (p < 0.01). The adsorption capacities of OTCs (e.g., TBT) on PP particle surfaces were significantly lower than those on PE surfaces (p < 0.05) but similar with those on PMMA due to the different surface areas, shapes, and surface hydrophobicity of microplastics. TBT degraded faster (9.1%) in PS than in PMMA suspension (11.2%) within 240 min, respectively. However, only less than 5.4% was photodegraded in PP suspension due to the light scattering or absorption of the large sized PP particles. This study provided new insight into the impacts of microplastics on photodegradation of micropollutants in natural waters.
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Researchers studied how organotin compounds leach from polyvinyl chloride microplastics under different light and water conditions. They found that UV and visible light exposure accelerated the release of certain organotin additives while simultaneously degrading others through photochemical reactions. The study demonstrates that environmental factors like salinity and dissolved organic matter significantly influence the rate at which microplastics release potentially harmful chemical additives into water.
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Researchers found that microplastic properties — including polymer type, surface chemistry, and aging state — govern the rate and pathway of solar photodegradation of sorbed anthracene in aquatic environments, with sorption to microplastics altering contaminant photochemical fate compared to free solution.
Microplastic PropertiesGovern the Photodegradationof Sorbed Anthracene in Aquatic Environments
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Researchers investigated how microplastic properties govern the photodegradation of anthracene, a model hydrophobic organic contaminant, in aquatic environments, finding that polymer type, surface characteristics, and aging state significantly influenced degradation rates. The study highlights that microplastics can both facilitate and inhibit contaminant photodegradation depending on their physicochemical properties.
The fate of microplastics in the environment: Systematic studies to determine release rates of secondary micro- and nanoplastics and water-soluble organics induced by photolysis and hydrolysis
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Researchers conducted systematic studies on the photolytic and hydrolytic degradation of microplastics using three photolysis protocols and multiple polymer types to determine release rates of secondary micro- and nanoplastics and water-soluble organics, providing mechanistic data needed for environmental fate and risk assessment.
The fate of microplastics in the environment: Systematic studies to determine release rates of secondary micro- and nanoplastics and water-soluble organics induced by photolysis and hydrolysis
AI summary Read the abstract
Researchers conducted systematic studies on the photolytic and hydrolytic degradation of microplastics using three photolysis protocols and multiple polymer types to determine release rates of secondary micro- and nanoplastics and water-soluble organics, providing mechanistic data needed for environmental fate and risk assessment.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.