AI Article Synopsis
- Research on PFAS (per- and polyfluoroalkyl substances) is focusing on developing effective remediation methods using new sorbents that utilize different interaction mechanisms, including hydrophobic, electrostatic, and fluorine-fluorine interactions.
- A modified polystyrene-divinylbenzene polymer (Sepra-WAX-KelF-PEI) was created to improve sorption capacity, with tests showing enhanced performance compared to its predecessors (Sepra-WAX and Sepra-WAX-KelF) for adsorbing various PFAS compounds.
- The study highlighted that Sepra-WAX-KelF-PEI achieved the highest average extraction capacity of 523 mg/g, demonstrating the importance of combining multiple interaction mechanisms for
Article Abstract
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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| http://dx.doi.org/10.1002/jssc.202400413 | DOI Listing |
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