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. 2024 Aug 2;4(9):2220–2233. doi: 10.1021/acsestengg.4c00211

Figure 2.

Figure 2

PFOA percent concentration (left y-axis) and percent defluorination (right y-axis) during the reaction with 20 mM sulfite irradiated under 254 nm UV light at pH10 in the presence of 1 g/L carbon sorbents (A) GAC, (B) CNT, or (C) Modified Lignin. Note that the vertical axis is on a logarithmic scale. Initial PFOA concentration before the addition of particles ([PFOA]o) was 12 μM, represented as 100%. PFOA was monitored in the aqueous phase (aq) and extracted from the sorbent (s). Error bars represent the standard error of replicate samples (n = 2 for all and n = 4 for sorbent phase PFOA in GAC). Fluoride was not detected (LOD = 0.02 ppm F–) when PFOA was reacted with GAC present.