A comparison between flow-through cathode and mixed tank cells for the electro-Fenton process with conductive diamond anode

Testing the role of electrode materials on the electro-Fenton and photoelectro-Fenton degradation of clopyralid

“…As well as, considering the well-known formation of other oxidants on the diamond surface, such as peroxosulfates, which in the presence of other oxidants can decompose and produce the very-powerful sulfate radical Eq. (14,15).…”

“…On the other hand, the oxidation ability of H2O2 can be strongly enhanced by the addition of an iron catalyst to the solution and the operation at acidic pHs, which allows getting the Fenton's reaction (Eq. 2) (electro-Fenton process) [11,14]. O2(g) + 2 H + + 2e -→ H2O2…”

Energy-Efficient H2O2 Electro-production Based on an Integrated Natural Air-Diffusion Cathode and Its Application

“…Therefore, the oxygen mass of surface diffusion, side diffusion, and total natural diffusion can be listed as eqs 9−11, respectively. (11) where M surface and M side are the oxygen masses in surface diffusion and side diffusion, g, respectively; D eff is the effective oxygen diffusion coefficient within the porous matrix, in cm 2 s −1 , which can be estimated by the related oxygen mass transfer models (for details, see Table S3); 48−51 S surface is the surface diffusion area (7.0 cm 2 ), and S side is the side diffusion area (2.8 cm 2 ); ρ is the oxygen concentration in air (g cm −3 ); x is the direct oxygen diffusion distance (cm), which was estimated at 0.3 cm; M total is the diffusion oxygen mass (g) without covering by hot glue. The oxygen content index (OCI, the nondimensional unit) was defined as the ratio of the actual diffusion and the theoretical reaction demand (100% for two-electron ORR) of oxygen concentration (eq 12).…”

“…Electrochemical advanced oxidation technology (EAOT) has attracted great attention because of its compatibility, convenient operation, and effectiveness in degrading nonbiodegradable contaminants. − The advantage of EAOT lies in the formation of strong oxidative species (e.g., HO· and SO 4 – ·) during electrolysis, − which has an outstanding capability for organic wastewater treatment. Electro-Fenton (EF) is one of the common and broadly reported EAOT processes, and it is based on the reaction of electro-generated H 2 O 2 for the formation of hydroxyl radicals (HO·). , The electro-generated H 2 O 2 is produced by the direct two-electron oxygen reduction reaction (ORR) pathway (eq ) and further continuously reacted with Fe 2+ through Fenton’s reaction (eq ), and the product of Fe 3+ can be regenerated on the cathode surface (eq ) in the EF system. ,− As for the safety and cost aspect, the in situ electro-generated H 2 O 2 can effectively avoid the storage and transport challenges during the EF process. , …”

Recent advances in electro-Fenton process and its emerging applications

“…Recent works have found that flow-through EF reactors have more obvious advantages than traditional batch reactors in terms of H2O2 production and pollutant degradation(Moraleda et al, 2020). In the former case, the solution flows through electrodes, enhancing the mass-transfer and current efficiency, and thus promoting the degradation of pollutants(Ma et al, 2016) Gao et al (2015).…”