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Adsorbed fraction (CS/Co = 1 – Cw/Co) of 12 μM (Co) (A) PFOA and (B) PFBA on 1 g/L of GAC, CNT, and modified lignin (LIG) in solutions of Milli-Q water at pH5, pH10, and pH10 with 20 mM sulfite (SO3–2). Aqueous phase samples were measured after 24 h of adsorption. Dashed reference lines indicate 100% sorbed mass fraction. Error bars represent the standard error of experimental duplicates of adsorption.
