Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 55, Issue 22, Pages 15162-15171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c03974
Keywords
adsorption mechanism; groundwater matrix; metal-organic frameworks; per- and polyfluoroalkyl substances
Categories
Funding
- U.S. National Science Foundation CAREER Program [1752771]
- Clarkson/SUNY ESF Healthy Water Solutions Center of Excellence (CoE)
- Center for Air and Aquatic Resources Engineering and Sciences (CAARES)
- Nanoporous Materials Genome Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences Program [DE-FG0217ER16362]
- U.S. Air Force [FA8903-17-C-0015]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1752771] Funding Source: National Science Foundation
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The study found that MOFs have different adsorption capacities for different types of PFAS, with the adsorption process being mainly influenced by electrostatic and acid-base interactions. Furthermore, the chain length of PFAS and the nature of the head group functionality also affect the adsorption efficiency.
Harmful per- and polyfluoroalkyl substances (PFAS) are ubiquitously detected in aquatic environments, but their remediation remains challenging. Metal-organic frameworks (MOFs) have been recently identified as an advanced material class for the efficient removal of PFAS, but little is known about the fundamentals of the PFAS@MOF adsorption process. To address this knowledge gap, we evaluated the performance of 3 different MOFs for the removal of 8 PFAS classes from aqueous film-forming foam-impacted groundwater samples obtained from 11 U.S. Air Force installations. Due to their different pore sizes/ shapes and the identity of metal node, MOFs NU-1000, UiO-66, and ZIF-8 were selected to investigate the role of MOF structures, PFAS properties, and water matrix on the PFAS@MOF adsorption process. We observed that PFAS@MOF adsorption is (i) dominated by electrostatic and acid-base interactions for anionic and non-ionic PFAS, respectively, (ii) preferred for long- over short-chain PFAS, (iii) strongly dependent on the nature of PFAS head group functionality, and (iv) compromised in the presence of ionic and neutral co-contaminants by competing for ion-exchange sites and PFAS binding. With this study, we elucidate the PFAS@MOF adsorption mechanism from complex water sources to guide the design of more efficient MOFs for the treatment of PFAS-contaminated water bodies.
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