Sorption and desorption of per- and polyfluoroalkyl substances (PFASs) on unmodified iron oxide and silica clay minerals

values on montmorillonite and kaolinite were not significantly dependent on pH levels, but were dependent on the length of the perfluoroalkyl chain. Less facile desorption from the silica clay minerals suggests that PFAS sorption is driven by relatively strong hydrophobic and electrostatic interactions. Together, our data make practical contributions to support site characterization and remediation efforts, while also contributing key insights into the fundamental sorption processes.