Impact of thermal modification of carbon felt on the performance of oxygen reduction reaction and mineralisation of dye in on-line electro fenton system

Carbon felt (CF) is frequently used as an electrode in various processes of oxygen reduction reactions (ORR) and water treatment. Therefore, it critical to increasing the performance this material ORR. In study, effect thermal modification, which a simple low-cost process, was examined. For testing hydrogen peroxide generation efficiencies mineralisation Acid Orange 7 (AO7) dye, modified CF electrodes (under 0–900°C N2 atmosphere for 1 hour) were cathodes with Ti/RuO2-IrO2-TiO2 anode saturated calomel (SCE) reference electrode. addition, find optimum Electro-Fenton (EF) process parameters, potential cathode (0.8–3.0 V), pH (3.0–9.0), Fe2+ concentration (0.2–1.0 mM) electrolyte (sodium sulphate) (10–500 investigated. The highest dye TOC removal achieved at 0.8 V, 50 mM 0.3 by using 900°C 96.26% 10 min 91.83% 120 min, respectively. Besides, modification increased electroactive surface area (41.70%) crystallite size (22.69%) Thus, more effective treatment achieved. Thanks electrical energy electrochemical saving are approximately 23.87% 70.22%, On other hand, kinetic study conducted large number data coming from on-line analysis system, different most systems literature. At end revealed that EF could not be explained single equation. It found system has two rate equations (first order pseudo first order) high correlation coefficients (R2 = 0.9965 9920).