“…However, the characteristic signal of 1 O 2 was not detected by ESR. The literature also reported that FFA could inhibit the electron transfer mechanism because the oxidation potential of FFA was weaker than the potential of catalyst/oxidant complex. , Thus, 1 O 2 was not generated in the system, and the electron transfer mechanism (ETP) might dominate the catalytic removal of the SAs. To further verify this hypothesis, a divided cell setup was employed to observe the current and voltage changes during the electron transfer process (Figure S34).…”