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Influence of microplastics on the photodegradation of perfluorooctane sulfonamide (FOSA)
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Polystyrene microplastics had the highest adsorption capacity for the PFAS compound perfluorooctane sulfonamide (FOSA) among four tested polymers, and PS-adsorbed FOSA showed accelerated photodegradation compared to dissolved FOSA under UV irradiation. The results suggest that microplastics can simultaneously concentrate and transform PFAS compounds in sunlit surface waters.
PFAS (per- and polyfluoroalkyl substances) are omnipresent in the environment and their transportation and transformation have attracted increased attention. Microplastics are another potential risk substances that can serve as a carrier for ubiquitous pollutants, thus affecting the presence of PFAS in the environment. In this study, the adsorption of perfluorooctane sulfonamide (FOSA) and perfluorooctanoic acid (PFOA) on four microplastics (PE, PVC, PS, and PTFE) and their effect on the photodegradation of FOSA were studied. The adsorption capacity of FOSA by PS was the highest, in similar, PS displayed the highest adsorption capacity in the presence of PFOA. Different effects of pH and salinity on the adsorption of FOSA and PFOA were observed among different microplastics indicating inconsistent interaction mechanisms. Furthermore, FOSA could be photodegraded, with PFOA as the main product, while the presence of microplastics had a negligible effect on the degradation of this contaminant. The results indicated that microplastics could act as PFAS concentrators. Moreover, their photochemical inertias make the pollutants enriched on microplastics more resistant to degradation.
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The partition behavior of perfluorooctanesulfonate (PFOS) and perfluorooctanesulfonamide (FOSA) on microplastics
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This study examined the sorption of PFOS and FOSA — two persistent fluorinated chemicals — onto polyethylene, polystyrene, and PVC microplastics and found that sorption capacity varied by polymer type and was influenced by pH, salinity, and organic matter. The results suggest microplastics could act as transport vectors for these persistent pollutants in marine environments.
Adsorption of perfluoroalkyl substances on microplastics under environmental conditions
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Researchers examined the capacity of three types of microplastics to sorb 18 perfluoroalkyl substances from freshwater and seawater. They found that perfluorosulfonates and sulfonamides had the strongest tendency to adsorb onto microplastics, with polystyrene showing greater affinity for these chemicals than polyethylene. The study suggests that microplastics in aquatic environments can concentrate harmful PFAS compounds, potentially increasing exposure for organisms that ingest them.
Microplastics as an adsorption and transport medium for per- and polyfluoroalkyl substances in aquatic systems: Polystyrene and undecafluorohexanoic acid interactions
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Researchers investigated interactions between polystyrene microplastics and the PFAS compound undecafluorohexanoic acid in aquatic systems, finding that microplastics can serve as adsorption and transport media for PFAS, with implications for their combined environmental impact.
Insight into the effect of natural aging of polystyrene microplastics on the sorption of legacy and emerging per- and polyfluorinated alkyl substances in seawater
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Naturally aged polystyrene microplastics showed different sorption behavior for nine PFAS compounds compared to virgin microplastics, with environmental aging altering the physicochemical properties that determine how strongly microplastics bind these 'forever chemicals' in seawater.
Mechanistic Insights into PFAS Adsorption on Microplastics: Effects of Contaminant Properties and Water Chemistry
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Researchers investigated how two widely detected PFAS compounds, PFOS and PFOA, adsorb onto five common types of microplastics in aquatic environments. The study found that contaminant properties and water chemistry significantly influence adsorption behavior, confirming that microplastics can serve as carriers for PFAS transport in waterways.
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