Per- and polyfluoroalkyl substances (PFAS), as a large class of synthetic organic chemicals, have been ubiquitously detected in surface water, groundwater, and wastewater across the globe. Compared with chemical/electrochemical destruction and biological degradation, adsorption (or adsorption-based filtration) is considered an economic and effective approach to rapidly remove PFAS from contaminated water. In the present work, a family of new functionalized PMO adsorbents containing amine and organic groups were developed and investigated for the removal of PFAS. PFBA was selected as a representative short-chain PFAS for detailed study because of its environmental prevalence and its challenging nature for adsorptive removal. The effects of water chemistry parameters on the sorption of PFBA onto functionalized PMO materials were evaluated, and the role of organic group loading on the adsorbent performance was determined. Furthermore, the mechanisms that govern PFBA adsorption onto functionalized PMO materials were investigated. The performance of the optimal functionalized PMO material was also examined for the removal of a mixture of PFAS with various structures, terminal functional groups, and chain lengths of the fluoroalkyl moiety under environmentally relevant concentrations.

Adsorption of per- and poly-fluoroalkyl substances on functionalized periodic mesoporous organosilica materials

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