The contamination caused by per- and polyfluoroalkyl substances (PFAS), particularly perfluorooctanoic acid (PFOA) and perfluorooctane sulfonates (PFOS), is a big concern worldwide due to their persistence in the environment. Removal of PFAS represents a special challenge for water/wastewater treatment because of their unique chemical/physical properties that include high water solubility, high stability of C-F bond, and varied chemical structures. In this study, we reported a nondestructive treatment method to remove PFOA and PFOS from contaminated water using Ca-montmorillonite amended with various novel organic modifiers. The successful intercalation of organic modifiers was verified with X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), zeta potential measurement and elemental analyzer, which also revealed the performance difference among materials modified with various organic structures. The sorption of PFOA and PFOS on modified Ca-montmorillonite with optimal organic functionality reached equilibrium within 30min. The optimal modified clay also showed high PFOA and PFOS removal efficiency in environmental relevant matrices. Functionalized montmorillonite is a promising material for environmentally friendly and sustainable applications in PFAS pollution control.<br/>

Sorption of PFOA and PFOS on organic-modified Ca-montmorillonite: Effect of modifier structure

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.