Figure 5 Identification of active oxidants (A) Effect of MeOH, TBA, and FFA on BPA degradation in the SA-Cu-NC+PMS system. (B) EPR spectra for  ⋅ OH/SO4 ⋅−  in the presence of DMPO in various systems. (C) EPR spectra for  1 O 2  in the presence of TEMP in various systems. (D) Decomposition of PMS in various systems. (E)  In situ  Raman spectra in various systems. (F) The open-circuit potential (OCP) curves of NC and SA-Cu-NC. Reaction conditions: Reaction conditions: [catalyst] = 0.04 g L −1 , [BPA] 0  = 50 μM, [PMS] 0  = 1.0 mM, [MeOH] 0  = [TBA] 0  = 1000 mM, [FFA] 0  = 10 mM (if any), initial pH = 5.8, Temp = 30°C.