Dual-Functional Nanofiltration and Adsorptive Membranes for PFAS and Organics Separation from Water.

ABSTRACT: Challenges associated with water separation technologies for per- and polyfluoroalkyl substances (PFASs) require efficient and sustainable processes supported by a proper understanding of the separation mechanisms. The solute rejections by nanofiltration (NF) at pH values near the membrane isoelectric point were compared to the size- and mass-transfer-dependent modeled rejection rates of these compounds in an ionized state. We find that the low pK _a value of perfluorooctanoic acid (PFOA) relates to enhanced solute exclusions by minimizing the presence and partitioning of the protonated organic compound into the membrane domain. The effects of Donnan exclusion are moderate, and co-ion transport also contributes to the PFAS rejection rates. An additional support barrier wit

SUBMITTER: Leniz-Pizarro F 

PROVIDER: S-EPMC9273029 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature