Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States.
J Am Chem Soc. 2017 Jun 14;139(23):7689-7692. doi: 10.1021/jacs.7b02381. Epub 2017 May 30.
Per- and poly fluorinated alkyl substances (PFASs), notably perfluorooctanoic acid (PFOA), contaminate many ground and surface waters and are environmentally persistent. The performance limitations of existing remediation methods motivate efforts to develop effective adsorbents. Here we report a β-cyclodextrin (β-CD)-based polymer network with higher affinity for PFOA compared to powdered activated carbon, along with comparable capacity and kinetics. The β-CD polymer reduces PFOA concentrations from 1 μg L to <10 ng L, at least 7 times lower than the 2016 U.S. EPA advisory level (70 ng L), and was regenerated and reused multiple times by washing with MeOH. The performance of the polymer is unaffected by humic acid, a component of natural organic matter that fouls activated carbons. These results are promising for treating PFOA-contaminated water and demonstrate the versatility of β-CD-based adsorbents.
全氟和多氟烷基物质（PFASs），特别是全氟辛酸（PFOA），污染了许多地下水和地表水资源，且在环境中具有持久性。现有修复方法的性能限制促使人们努力开发有效的吸附剂。在这里，我们报告了一种基于β-环糊精（β-CD）的聚合物网络，与粉末状活性炭相比，对 PFOA 具有更高的亲和力，同时具有相当的容量和动力学性能。β-CD 聚合物可将 PFOA 浓度从 1μg/L 降低到<10ng/L，至少比 2016 年美国环保署的建议水平（70ng/L）低 7 倍，并可通过用甲醇洗涤多次再生和重复使用。聚合物的性能不受腐殖酸的影响，腐殖酸是天然有机物的一种成分，会使活性炭受到污染。这些结果为处理受 PFOA 污染的水提供了希望，并展示了基于β-CD 的吸附剂的多功能性。
