Per- and polyfluoroalkyl substances (PFASs) are lipophilic pollutants of increasing health concern due to their environmental persistence, bioaccumulation, and toxicity. Remediation techniques have been set up for PFAS removal, such as electron beam, which exhibits excellent performance due to its cost-effective ability of producing large amounts of both reducing and oxidizing species. However, the degradation efficiency and mechanisms of the shorter-chain PFASs by eBeam irradiation are poorly known. Herein, perfluoroheptanoic acid was exposed to different eBeam doses of 0–75 kGy. We tested the effect of pH (6.0 and 13.0), nitrate ions, and fulvic acids in water. Results show that highly alkaline conditions favored the removal of perfluoroheptanoic acid at 100.0 μg/L with complete elimination at eBeam doses of 50 kGy and 75 kGy. Nitrate, fulvic acid, and CaCO₃ alkalinity did not inhibit perfluoroheptanoic acid degradation. Defluorination and decarboxylation are proposed to be the major degradation pathways based on the identification of two degradation products. Overall, our findings show that eBeam irradiation is a promising remediation technique to break down the shorter-chain PFASs.

由于全氟烷基物质和多氟烷基物质（PFAS）的环境持久性，生物蓄积性和毒性，它们是越来越引起健康问题的亲脂性污染物。已经建立了用于去除PFAS的修复技术，例如电子束，由于其具有生产大量还原和氧化物质的成本效益能力，因此具有出色的性能。但是，通过电子束照射降解短链PFAS的效率和机理尚不清楚。在此，全氟庚酸暴露于0–75 kGy的不同eBeam剂量。我们测试了pH值（6.0和13.0），硝酸根离子和富里酸在水中的影响。结果表明，高碱性条件有利于以100.0μg/ L的浓度除去全氟庚酸，并且在eBeam剂量为50 kGy和75 kGy时可以完全消除。硝酸盐₃碱度没有抑制全氟庚酸的降解。基于对两种降解产物的鉴定，提出脱氟和脱羧是主要的降解途径。总体而言，我们的发现表明，eBeam辐照是一种有前景的修复技术，可以分解短链PFAS。