Laser-Induced Nitrogen-Doped Graphene Composite Iron-Cobalt Hydroxide for Methylene Blue Degradation via Electrocatalytic Activation of Peroxymonosulfate

With the acceleration of industrialization, the removal of refractory organic dyes from water and how to promote its practical application remains a challenge. Herein, we synthesized an FeCo-LDH/LI-NDG composite electrode material by a simple laser-induced technique on polyimide films, which could electrocatalytically activate peroxymonosulfate (PMS) to completely degrade MB in about 6 min. The reaction rate constant (k(obs)) was 0.461 min(-1). It was faster than most of the currently reported electrocatalysts. The reaction system demonstrated good interference resistance and catalytic effectiveness in the pH range of 3 to 9. According to the chemical quenching and electron paramagnetic resonance (EPR) experiments, the non-radical pathway of O-1(2) and the radical pathways of SO4 & BULL;-, & BULL;OH and O-2(& BULL;-) were involved in the reaction synergistically, with O-1(2) playing the dominant role. O-1(2) was produced through the dual pathway of PMS electron loss at the anode and O-2(& BULL;-) intermediate transformation at the cathode. The two activation methods of electro-activation and catalytic activation of PMS had synergistic effects to achieve high efficiency in the whole process of production, reaction and recovery, providing new ideas to advance practical applications.