Efficient electrochemical generation of hydrogen peroxide by means of plasma-treated graphite electrode and activation in electro-Fenton

Herein, air, argon, nitrogen and oxygen plasmas were used in glow discharge plasma under alternative current to enhance the, surface properties of graphite. The plasma-treated graphite electrodes (PTGE) were used as cathode in electro-Fenton (EF) for Acid Orange 7 (AO7) degradation. O-2-PTGE exhibited the best activity owing to its improved surface characteristics. Later, the effects of the main operational condition on O-2-PTGE efficacy in EF and the stability of O-2-PTGE were evaluated and degradation intermediates were identified. Finally, the performance of the studied system was assessed in heterogeneous condition using martite as catalyst and compared with homogeneous system. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.