Figure 3.

(A) PFBA decomposition with 20 mM SO₃^–2 and 254 nm UV light at pH10, without and with 1 g/L particles (GAC, CNT, LIG). [PFBA]_o = 12 μM. Error bars represent the standard error of replicate measurements (n = 3 for CNT, n = 2 for the rest). (B) Observed pseudo-first-order rate constants (k_obs) for PFOA and PFBA (12 μM initial concentration) without and with particles. k_obs for PFOA in the presence of GAC was measured from the aqueous PFOA disappearance. For the rest, k_obs were measured from the total disappearance profile of each compound, thus the sum of the aqueous and solid phases. (C) Percent defluorination for PFOA at t = 180 min and PFBA at t = 480 min without and with particles. *Fluoride was not detected (LOD = 0.02 ppm F^–) when PFOA was reacted with GAC.