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- Title
Rim‐Based Binding of Perfluorinated Acids to Pillararenes Purifies Water.
- Authors
Gao, Tu‐Nan; Huang, Si; Nooijen, Rick; Zhu, Yumei; Kociok‐Köhn, Gabriele; Stuerzer, Tobias; Li, Guanna; Bitter, Johannes H.; Salentijn, Gert I. J.; Chen, Bo; Miloserdov, Fedor M.; Zuilhof, Han
- Abstract
Per‐ and polyfluoroalkyl substances (PFAS) pose a rapidly increasing global problem as their widespread use and high stability lead worldwide to water contamination, with significant detrimental health effects.[1] Supramolecular chemistry has been invoked to develop materials geared towards the specific capture of PFAS from water,[2] to reduce the concentration below advisory safety limits (e.g. 70 ng/L for the sum of perfluorooctane sulfonic acid, PFOS and perfluorooctanoic acid, PFOA). Scale‐up and use in natural waters with high PFAS concentrations has hitherto posed a problem. Here we report a new type of host–guest interaction between deca‐ammonium‐functionalized pillar[5]arenes (DAF−P5s) and perfluoroalkyl acids. DAF−P5 complexes show an unprecedented 1 : 10 stoichiometry, as confirmed by isothermal calorimetry and X‐ray crystallographic studies, and high binding constants (up to 106 M−1) to various polyfluoroalkyl acids. In addition, non‐fluorinated acids do not hamper this process significantly. Immobilization of DAF−P5s allows a simple single‐time filtration of PFAS‐contaminated water to reduce the PFOS/PFOA concentration 106 times to 15–50 ng/L level. The effective and fast (<5 min) orthogonal binding to organic molecules without involvement of fluorinated supramolecular hosts, high breakthrough capacity (90 mg/g), and robust performance (>10 regeneration cycles without decrease in performance) set a new benchmark in PFAS‐absorbing materials.
- Subjects
PERFLUOROOCTANOIC acid; FLUOROALKYL compounds; SUPRAMOLECULAR chemistry; WATER pollution; SULFONIC acids
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 20, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202403474