Division of Environmental Design, Graduate School of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Faculty of Geoscience and Civil Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Chemosphere. 2023 Nov;341:139983. doi: 10.1016/j.chemosphere.2023.139983. Epub 2023 Aug 27.
Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) present in various water sources have raised a serious concern on their health risk worldwide. Anion exchange is known to be one of the effective treatment methods but the resin properties suitable for theses contaminants have not been fully understood. We examined four commercially available anion exchange resins with different properties (DIAION™ PA312, HPA25M, UBA120, and WA30) and one polymer-based adsorbent (HP20), for their PFOA and PFOS removal in the batch experiment. All or a part of the selected resins were further characterized for their functional group, surface morphology and pore size distribution. The 72 h batch experiment with the 100 mg/L PFOA or PFOS in the laboratory pure water matrix showed a superior capacity of the strong base anion exchange resins, the porous-type HPA25M and PA312, and the gel-type UBA120, for PFOA removal (92.6-97.9%). Among those resins, the high porous HPA25M was suggested most effective due to its remarkably high reaction rate and effectiveness to PFOS (99.9%). In the groundwater matrix, however, the performance of the those anion exchange resins was generally suppressed, causing up to 71% decrease in their removal rates. The least matrix impact was observed for PFOS removal by HPA25M, which indicated the resin's high selectivity to the contaminant. The physiochemical analysis indicated that the presence of relatively large pores (1 nm-10 nm) over HPA25M played an important role in the PFAS removal.
全氟辛酸 (PFOA) 和全氟辛烷磺酸 (PFOS) 存在于各种水源中，引起了全世界对其健康风险的严重关注。阴离子交换被认为是一种有效的处理方法，但适合这些污染物的树脂特性尚未完全了解。我们研究了四种具有不同特性的市售阴离子交换树脂 (DIAION™ PA312、HPA25M、UBA120 和 WA30) 和一种聚合物基吸附剂 (HP20)，以评估它们在批处理实验中对 PFOA 和 PFOS 的去除效果。选择的部分或全部树脂进一步进行功能基团、表面形貌和孔径分布的特性研究。在实验室纯水中进行的 72 小时批处理实验中，强碱性阴离子交换树脂、多孔型 HPA25M 和 PA312 以及凝胶型 UBA120 对 PFOA 具有优异的去除能力 (92.6-97.9%)。在这些树脂中，高多孔 HPA25M 由于其高反应速率和对 PFOS 的高效去除能力 (99.9%)，被认为是最有效的。然而，在地下水基质中，这些阴离子交换树脂的性能普遍受到抑制，导致其去除率下降了 71%。HPA25M 对 PFOS 的去除受基质影响最小，这表明该树脂对污染物具有较高的选择性。物理化学分析表明，HPA25M 中存在相对较大的孔 (1nm-10nm) 对 PFAS 的去除起着重要作用。
