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Highly efficient removal of per- and polyfluoroalkyl substances by extrusion-regenerated aminated polyurethane sponges
Water Research ( IF 11.4 ) Pub Date : 2025-01-22 , DOI: 10.1016/j.watres.2025.123189
Xinhao Wang, Hanyang Chen, Wenran Wang, Xiufang Shen, Jiabao Wang, Sen Chen, Xueru Yu, Chew Tin Lee, Zhanghao Chen, Cheng Gu

Per- and polyfluoroalkyl substances (PFAS) are a class of persistent organic compounds widely detected in the environments. Due to their chemical stability, physical adsorption has emerged as one of the most promising techniques for remediating PFAS-containing wastewater, while some newly synthesized functional absorbents in powder form suffer from separation issues. Inspired by mussel biology, we have successfully synthesized a porous spongy absorbent termed aminated polyurethane (PU-PDA-PANI) with over 99.5% removal efficiency for initial 10 mg L−1 perfluorooctanoic acid (PFOA), corresponding to the maximum adsorption capacity of 1.42 g g−1, which was superior to the ion exchange resin (Purolite® PFA694E, 0.764 g g−1). In addition to PFOA, PU-PDA-PANI also showed excellent removal efficiencies for other typical PFAS (i.e. perfluorooctane sulfonates, perfluorobutyric acid, perfluorooctane-1,8-dioic acid, hexafluoropropylene oxide trimer acid, etc), and the adsorption processes resistant to pH changes and co-existing environmental matrixes. Furthermore, PU-PDA-PANI can be readily reused and regenerated by coupling extrusion and elution procedures. The adsorption mechanism of electrostatic, hydrogen bond and hydrophobic synergistic interaction was further proposed with the support of theoretical calculation. In conclusion, this study develops an efficient and recyclable PFAS adsorbent and proposes some new insights for the design of PFAS-selective adsorbents.

中文翻译:


通过挤出再生胺化聚氨酯海绵高效去除全氟和多氟烷基物质



全氟烷基和多氟烷基物质 (PFAS) 是一类在环境中广泛检测到的持久性有机化合物。由于其化学稳定性,物理吸附已成为修复含 PFAS 废水的最有前途的技术之一,而一些新合成的粉末状功能性吸收剂则存在分离问题。受贻贝生物学的启发,我们成功合成了一种称为胺化聚氨酯 (PU-PDA-PANI) 的多孔海绵状吸收剂,对初始 10 mg L −1 全氟辛酸 (PFOA) 的去除效率超过 99.5%,对应于 1.42 g g −1 的最大吸附容量,优于离子交换树脂(Purolite® PFA694E,0.764 g g −1 ).除 PFOA 外,PU-PDA-PANI 对其他典型 PFAS(即全氟辛烷磺酸盐、全氟丁酸、全氟辛烷-1,8-二酸、六氟环氧丙烷三聚体酸等)以及耐 pH 值变化和共存环境基质的吸附过程也表现出优异的去除效率。此外,PU-PDA-PANI 可以通过耦合挤出和洗脱程序轻松重复使用和再生。在理论计算的支持下,进一步提出了静电、氢键和疏水协同作用的吸附机理。综上所述,本研究开发了一种高效且可回收的 PFAS 吸附剂,并为 PFAS 选择性吸附剂的设计提出了一些新的见解。
更新日期:2025-01-22
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