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Thermal destruction of per‐and polyfluoroalkyl substances in alkaline aprotic solvent

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 505, Page: 159296
2025
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Article Description

This study presents the rapid degradation of a broad range of per‐ and polyfluoroalkyl substances (PFAS) by mild heat treatment (100-120 ℃) in an alkaline aprotic solvent, dimethyl sulfoxide (DMSO). The degradation of 13 representative PFAS by this destruction process was investigated, revealing that PFAS containing non-fluorinated carbons (e.g., 6:2 FTCA, 6:2 FTSA, HFPO-DA, and 6:2 diPAP) and perfluorinated carboxylic acids (PFCAs) exhibited remarkably rapid degradation. These compounds demonstrated efficient removal, with up to 100% of parent compound decay within 4 h, accompanied by initial first-order decay rate constants of up to (1.42 ± 0.26) × 10 -2 sec -1. The concentrations of NaOH and DMSO significantly influenced PFAS degradation, with higher concentrations leading to more rapid PFAS degradation. Furthermore, this destruction process efficiently degraded up to 91.6% of PFAS extracted from real biosolid samples, indicating minimal impacts by biosolid matrix constituents. Overall, this study expands the understanding of thermal destruction of PFAS in alkaline aprotic solvents and highlights this destruction technology as a promising approach for various types of PFAS in real sample matrices.

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