Making cathode composites more efficient for electro-fenton and bio-electro-fenton systems: A review

Green-Activated Charcoal-Anchored Iron Oxide-Driven Microbial Electro-Fenton System for Sustainable Mitigation of Refractory Contaminants

“…46 Usually, a higher H 2 O 2 concentration in the catholyte translates to a higher availability of • OH for carrying out the oxidation of the contaminant. 22 It indicates that the dye removal in Gt-Fe/AC-MFC under open-circuit condition was via an adsorptive mechanism and the relatively higher removal in C-MFC could be due to the combined effect of adsorption and oxidation via less-potent reactive species like peroxide ion radicals produced via H 2 O 2 in the absence of Fenton's catalyst. 47 Meanwhile, under closed-circuit conditions, removal of CBB dye occurred mainly due to oxidation via • OH.…”

“…Unfortunately, conventional carbon electrodes suffer from extremely slow O 2 reduction kinetics due to inherent structural flaws and require a catalyst to sustain the system. 22 In BEF systems, a carbon-based inorganic electrocatalyst is usually employed to expedite in situ electrosynthesis of H 2 O 2 and • OH concurrently. To instigate this process, the Fenton catalyst is frequently employed, preferably a heterogeneous catalyst that can function at circumneutral pH.…”

“…Moreover, for bioelectrochemical systems where 2e – reduction of O 2 is desired, carbon-based cathodes are employed as they favor this particular ORR pathway. Unfortunately, conventional carbon electrodes suffer from extremely slow O 2 reduction kinetics due to inherent structural flaws and require a catalyst to sustain the system . In BEF systems, a carbon-based inorganic electrocatalyst is usually employed to expedite in situ electrosynthesis of H 2 O 2 and • OH concurrently.…”

Recent Advances in Applied Electrochemistry: A Review

“…These processes tend to increase the rate of pollution removal, eliminate disadvantages, and expand the applicability of existing electrochlorinated water-treatment techniques to improve cost effectiveness. The following emerging and combined electrochemical processes, such as electrodeionization [148], capacitive deionization [149], electro-Fenton [150], microbial fuel cell treatment [151], photo-and sonoelectrocatalyses, are showing impressive results in water depollution, especially at lab scale [152]. However, the main concern in the use of these processes remains the scale-up to industrial scale which is a very challenging step to apply these processes.…”

Enhancing organic contaminant degradation through integrating advanced oxidation processes with microbial electrochemical systems

“…1B). The energy consumption data of EF were obtained from the studies degrading recalcitrant organic contaminants (e. g., phenolic compounds and azo dyes) at comparable concentration levels as mg-g L − 1 (Liu et al, 2021;Nidheesh and Gandhimathi, 2012;Wang et al, 2021;Wang et al, 2023;Zhou et al, 2012). It should be noted that BEF exhibits lower removal rates of the organic pollutants than those in EF, likely due to its lower system current/voltage.…”