Surface-modified sorbents for poly- and perfluoroalkyl substances (PFAS) removal in aqueous systems and their degradation
발표자
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초록
내용
Per- and polyfluoroalkyl substances (PFAS) are persistent pollutants that pose health risks, including cardiovascular diseases and cancer. Adsorption is a promising method for PFAS removal due to its simplicity and cost-effectiveness. However, hydrophobic adsorbents are effective for long-chain PFAS but not for short-chain PFAS. Additionally, concentrated PFAS on adsorbents can leach back into water. We investigated adsorbents for removing both long-chain and short-chain PFASs, as well as for degrading PFAS. The maximum adsorption capacity of long-chain and short-chain PFASs was 5606 μg g⁻¹ and 5076 μg g⁻¹, respectively. Notably, the adsorption capacity of short-chain PFAS increased from 2808 to 5076 μg g⁻¹ as the surface became less hydrophobic. Both PFASs were degraded to trifluoroacetic acid (TFA) in a polar aprotic solvent environment within 65 hours. This study demonstrates that surface wettability influences the adsorption capacity of short-chain PFAS, and PFAS can be completely degraded into TFA.