Kinetic study on regeneration of FeIIEDTA in the wet process of NO removal

Cyclic voltammetry, quasi-steady-state polarization curves and potentiostatic step method were applied to study the regeneration of FeIIEDTA in the wet process of NO removal. The results showed that the FeIIIEDTA reduction was a fast reversible process with one electron transferred on Pt electrode surface. Standard rate constant k0 of FeIIIEDTA reduction at 298 K was found to be 0.0263 cm s−1. According to the calculated diffusion activation energy of 24.93 kJ mol−1, apparent activation energy of 25.74 kJ mol−1 and the electron transfer activation energy of 16.56 kJ mol−1, the rate-determining step for FeIIIEDTA reduction was diffusion step. Potentiostatic electrolysis tests revealed that direct electrochemical regeneration of FeIIEDTA in the wet process of NO removal was a promising method because of its high efficiency.