Microplastics as Vectors of PFAS: Adsorption Mechanisms, Environmental Fate, and Toxicological Implications
摘要
The pervasive occurrence of per- and polyfluoroalkyl substances (PFAS) and microplastics (MPs) in aquatic and terrestrial environments has raised growing concern due to their persistence, mobility, and combined toxicological effects. This review synthesizes updated knowledge on the co-occurrence of PFAS and MPs, emphasizing the mechanisms governing PFAS adsorption onto MPs. Key physicochemical properties of both PFAS (e.g. hydrophobicity, chain length, functional groups) and MPs (e.g. polymer type, surface charge, ageing) are analysed alongside environmental factors such as pH, salinity, and dissolved organic matter that modulate these interactions. The chapter further explores the environmental fate and transport of PFAS and MPs, highlighting MPs’ potential role as carriers that enhance PFAS mobility across water-soil systems. Finally, this review provides a comprehensive assessment of the toxicological implications of their combined presence for aquatic and terrestrial organisms, plants, and humans and discusses emerging regulatory challenges. Critical research gaps and future directions are identified to inform risk assessment and policy development aimed at mitigating the joint impact of PFAS and MPs in the environment.