Characterization of a mixed mode fluorocarbon/weak anion exchange sorbent for the separation of perfluoroalkyl substances

Characterization of a mixed mode fluorocarbon/weak anion exchange sorbent for the separation of perfluoroalkyl substances

The ubiquitous presence and persistence of per‐ and polyfluoroalkyl substances (PFAS) in the environment have raised concerns in the scientific community. Current research efforts are prioritizing effective PFAS remediation through novel sorbents with orthogonal interaction mechanisms. Recognized so...

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Bibliographic Details
Published in:Journal of separation science Vol. 47; no. 16; pp. e2400413 - n/a
Main Authors: Olomukoro, Aghogho A., Xie, Ruichao, Paucar, Fabiola X. Fernandez, DeRosa, Charlotte, Danielson, Neil D., Gionfriddo, Emanuela
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01-08-2024
Subjects:
Acids
Adsorption
Anion exchanging
Aqueous solutions
Chemical bonds
Chemical synthesis
Divinylbenzene
Electrostatics
Fluorine
Hydrophobic surfaces
Hydrophobicity
mixed mode adsorption fluorocarbon polymers
Perfluoro compounds
Perfluoroalkyl & polyfluoroalkyl substances
perfluoroalkyl substances
Polyetherimides
Polystyrene resins
Remediation
solid‐phase microextraction
Sorbents
Sorption
Waxes
mixed mode adsorption fluorocarbon polymers
perfluoroalkyl substances
solid‐phase microextraction
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Summary:The ubiquitous presence and persistence of per‐ and polyfluoroalkyl substances (PFAS) in the environment have raised concerns in the scientific community. Current research efforts are prioritizing effective PFAS remediation through novel sorbents with orthogonal interaction mechanisms. Recognized sorption mechanisms between PFAS and sorbents include hydrophobic, electrostatic, and fluorine‐fluorine interaction. The interplay of these mechanisms contributes significantly to improved sorption capacity and selectivity in PFAS separations. In this study, a primary/secondary amine‐functionalized polystyrene‐divinylbenzene (Sepra‐WAX) polymer was modified to create a fluorinated WAX resin (Sepra‐WAX‐KelF‐PEI). The synthesis intermediate (Sepra‐WAX‐KelF) was also tested to assess the improvement of the final product (Sepra‐WAX‐KelF‐PEI). The adsorption capacity of Sepra‐WAX, Sepra‐WAX‐KelF, and Sepra‐WAX‐KelF‐PEI, and their interactions with PFAS were evaluated. The effect of pH, ionic strength, and organic solvents on PFAS sorption in aqueous solution was also investigated. The sorbents showed varied adsorption capacities for perfluorooctanoic acid, perfluoropentanoic acid, perfluoro‐n‐decanoic acid, and hexafluoropropylene oxide dimer acid, with the average extraction capacity of the four analytes being Sepra‐WAX‐KelF‐PEI (523 mg/g) > Sepra‐WAX (353 mg/g) > Sepra‐WAX‐KelF (220 mg/g). Sepra‐WAX‐KelF‐PEI provided the highest adsorption capacity for all analytes tested, proving that the combination of electrostatic and hydrophobic/fluorophilic interactions is crucial for the effective preconcentration of PFAS and its future applications for PFAS remediation from aqueous solutions.
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ISSN:1615-9306
1615-9314
1615-9314
DOI:10.1002/jssc.202400413