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. 2024 Feb 15;4(3):748–757. doi: 10.1021/acsestengg.3c00462

Figure 4.

Figure 4

(a) LC/MS chromatograms of technical PFOA mixtures before and after 24 h of adsorption; (b) LC/MS chromatograms of technical PFOA mixtures during photodegradation; (c) kinetics of degradation of technical PFOA mixtures. Assignment of PFOA isomer standards to LC/MS chromatograms from technical PFOA. The annotations in the chromatograms represent the structure of each isomer according to the position of CF3-substituents in the chain, e.g., 4,5 m-PFOA = CF3–CF(CF3)–CF(CF3)–CF2–CF2–COOH. Lines in plots of relative concentrations are added as guides for the eye. Conditions: 1 g L–1 zeolite, C0,PFOA = 48 μM, pH0 = 5.