Sorption and mechanisms of legacy and emerging perand polyfluoroalkyl substances (PFASs) on different particle size fractions of marine sediments

文献类型： 外文期刊

第一作者： Hu, Jun-Jie

作者： Hu, Jun-Jie;Yu, Shang-Ke;Yin, Chao;Pan, Chang-Gui;Yu, Kefu;Peng, Feng-Jiao;Peng, Feng-Jiao;Liu, Shuang-Shuang

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关键词： Per; and polyfluoroalkyl substances; Marine sediment; Sorption; Particle sizes; Hydrophobic interactions

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：7.7； 五年影响因子：7.7 ）

ISSN： 0013-9351

年卷期： 2025 年 278 卷

页码：

收录情况： SCI

摘要： PFASs are ubiquitous in various environmental and biological media due to their extensive application and stability. However, the sorption of PFASs, especially emerging PFASs, on different particle size fractions of marine sediments remains unknown. Here, we investigated the sorption kinetics, isotherms, and mechanisms of six legacy and emerging PFASs on five different particle size fractions of marine sediments (F1 (69.4-190 mu m), F2 (63.3-163 mu m), F3 (5.25-72.6 mu m), F4 (3.29-34.7 mu m), and F5 (1.69-22.7 mu m)). Our results indicated that the sorption kinetics and isotherms conformed well to the pseudo-second-order model and the Freundlich model, respectively, suggesting the nonlinear sorption of PFASs on marine sediments. The sorption capacities of PFASs decreased significantly with increasing sediment particle size from F5 to F1. Meanwhile, PFAS distribution coefficients (Kd) correlated positively with organic carbon content, specific surface area, and sediment pore volume. Kd values of PFOA and PFOS were 0.40-0.65 and 2.64-6.12 times higher than those of their substitutes, GenX and 6:2 FTSA. Hydrophobic interactions dominated PFAS sorption over electrostatic interactions. Overall, this study offers a comprehensive understanding of legacy and emerging PFAS distribution and mechanisms in marine sediments of varying particle sizes.

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