Removal of Complex Mixtures of Perfluoroalkyl Acids from Water Using Molecularly Engineered Coatings on Sand and Silica
Abstract
Rationally-designed organosilica adsorbents where synthesized to study the adsorption of perfluoroalkyl substances (PFAS) from water. The goals were to better understand mechanisms of adsorption and thus design optimal adsorbents to minimize costs of remediation. Swellable organically modified silica (SOMS) was used as a platform as it can be modified by use of different silane monomers and entrapped cationic polymers. Adsorbents were studied using a series of bench-scale isotherm and column experiments. Measurements were done in comparison to activated carbon and ion exchange resins currently used in water treatment. The best performing SOMS adsorbent was evaluated in a pilot test installed on a side stream at the Former Joint Reserve Base (JRB)Naval Air Station (NAS) Willow Grove. Data suggest that PFAS self-assemble into aggregates which enhances the adsorption of long-chain PFAS. This work advanced the field of PFAS adsorbents for remediation by providing insights into adsorption mechanisms and a new type of adsorbent.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 18, 2020
- Accession Number
- AD1154366
Entities
People
- Erika F Houtz
- Jeff Mcdonough
- Paul L. Edmiston
Organizations
- College of Wooster