Abstract：
The presence of perfluoroalkyl substances (PFAS) in the environment poses a significant threat to ecological safety and environmental health. Widespread microplastics (MPs) have been recognized as vectors for emerging contaminants due to human activities. However, the adsorption behaviors of PFAS on MPs, especially on aged MPs, have not been extensively investigated. This study aimed to investigate the adsorption behaviors of perfluorooctanoic acid (PFOA) on aged MPs (polystyrene, polyethylene, and polyethylene terephthalate) treated with UV irradiation and persulfate oxidation under salinity and dissolve organic matter (DOM) condition. Carbonyl index values of MPs increased after the aged treatment, indicating the production of oxygen-containing groups. The PFOA adsorption on aged MPs was impacted by the co-existence of Na+ ions and DOM. As PFOA adsorption onto aged MPs was mainly controlled by hydrophobic interaction, the electrostatic interaction also made a contribution, but there was no significant change in PFOA adsorption behavior between the pristine and aged MPs. While these findings provide insight into PFAS adsorption on aged MPs, further research is necessary to account for the complexity of the real environment. PRACTITIONER POINTS: Adsorption behaviors of perfluorooctanoic acid (PFOA) on aged microplastics were investigated. Hydrophobic interaction mainly controlled PFOA adsorption on aged microplastics (MPs). Co-existence dissolve organic matter and salinity influenced PFOA adsorption behaviors on aged MPs.
摘要：
环境中全氟烷基物质（PFAS）的存在对生态安全和环境健康构成了重大威胁。广泛的微塑料（MP）已被认为是由于人类活动而出现的污染物的载体。然而,PFAS在MPs上的吸附行为,尤其是老年议员，没有被广泛调查。本研究旨在研究全氟辛酸(PFOA)在老化的MPs(聚苯乙烯,聚乙烯,和聚对苯二甲酸乙二醇酯）在盐度和溶解有机物（DOM）条件下经过紫外线照射和过硫酸盐氧化处理。老年治疗后，MPs的羰基指数值增加，表明含氧基团的产生。Na离子和DOM的共存影响了PFOA在老化MPs上的吸附。由于PFOA在老化的MPs上的吸附主要受疏水相互作用的控制，静电相互作用也做出了贡献，但是原始和老化的MPs之间的PFOA吸附行为没有显着变化。虽然这些发现提供了对PFAS在老化MPs上吸附的见解，需要进一步的研究来考虑现实环境的复杂性。实践要点：研究了全氟辛酸（PFOA）在老化微塑料上的吸附行为。疏水相互作用主要控制PFOA在老化微塑料（MPs）上的吸附。共存溶解有机物和盐度影响PFOA对老化MPs的吸附行为。
