Fig. 2: Sorption efficiency, kinetics, capacity and regeneration of PFPE-IEX + .
From: Fluoropolymer sorbent for efficient and selective capturing of per- and polyfluorinated compounds
a Chemicals structure of 11 types of PFAS used in this study. b, Removal efficiency of 11 PFAS treated PFPE-IEX+ (red), GAC (gray) and IEX (light blue) for 24 h. Sorbent concentration, 0.5 mg mL-1; PFAS initial concentration, 100 ppb each. Water constituents, milli-Q water with the presence of NaCl (200 ppm) and humic acid (20 ppm), pH = 5.0. The error bars denote standard deviations, where n = 3. c Sorption kinetics using PFPE-IEX+ in milli-Q water. Sorbent concentration, 0.1 mg mL-1; PFAS initial concentration, 100 ppb each. d Binding isotherm study between HFPO-DA and PFPE-IEX + . Sorbent concentration, 0.1 mg mL-1; HFPO-DA concentration, 0.1–50 ppm; sorption duration, 24 h. e Individual capacity of eight different PFAS of PFPE-IEX+ determined by 19F NMR. Sorbent concentration, 0.2 mg mL-1; PFAS concentration, 0.4 mg mL-1 each in Milli-Q water; Sorption duration, 24 h. The error bars denote standard deviations, where n = 3. f Regeneration performance for multiple PFAS using PFPE-IEX+ determined by LC-MS/MS (sorbed (red); desorbed (blue)). Sorbent concentration, 1 mg mL-1; [PFAS]0 = 10 ppm; sorption and desorption duration, 30 min. The variations in sorption capacity in mg g-1 are attributed to the differing initial concentrations of each PFAS.
