A stable CoSP/MWCNTs air-diffusion cathode for the photoelectro-Fenton degradation of organic pollutants at pre-pilot scale

Mineralization of Methyl Orange azo dye by processes based on H2O2 electrogeneration at a 3D-like air-diffusion cathode

“…Further, the operation parameters evaluated to characterize the PEF process were j (10-25 mA cm -2 ), Q (0.5-2.0 L min -1 ) and the initial dye concentration (20-50 mg L -1 total organic carbon (TOC)). The values of catalyst concentration and pH were fixed because these have been conveniently optimized in previous works for the EF and PEF treatments of various POPs (El-Ghenymy et al, 2013;Alcaide et al, 2020).…”

“…Fenton-based EAOPs like EF and PEF processes have become increasingly popular for the fast degradation of organic pollutants in water (Brillas and Martínez-Huitle, 2015;Brillas and Sirés, 2015;Brillas, 2020). The common feature of these methods is the in-situ H2O2 electrogeneration from the cathodic reduction of O2, according to reaction (1) (Coria et al, 2015;Le et al, 2015;Scialdone et al, 2015;Salmerón et al, 2019), which is highly efficient at carbon-based materials like carbon black (Lanzalaco et al, 2017;Lima et al, 2020), carbon nanotubes (Gendel et al, 2014;Alcaide et al, 2020), graphene (Le et al, 2015;Yang et al, 2019), carbon felt / graphite felt (El-Ghenymy et al, 2013;Lin et al, 2017;Pérez et al, 2018) or vitreous carbon (González- Pérez and Bisang, 2014;. Some of these materials have been implemented as cathodes that are simultaneously in contact with the conductive solution and an air chamber fed with O2 or air, in the so-called gas-diffusion electrodes (GDE) conformation, which is the most suitable to produce H2O2 (El-Ghenymy et al, 2013;Barazesh et al, 2015;Yu et al, 2015;Lanzalaco et al, 2017;Coria et al, 2018;Salmerón et al, 2019;Lima et al, 2020).…”

“…The PEF process was developed to overcome that drawback thanks to the high photosensitivity of those complexes under UVA irradiation (Brillas, 2020). UVA photons cause the photolysis of main dissolved Fe(III) species, such as Fe(OH) 2+ via reaction (5) and metal-organic complexes from reaction (6) (El-Ghenymy et al, 2013;Alcaide et al, 2020). Note that both reactions involve the photoregeneration of Fe 2+ , which feeds reaction (2) to enhance the • OH production.…”

Development of Electrocoagulation and Detection Approaches for Manipulation of Volatile Compound Profiles in Organic Medium Supported Using Two‐Phase Electrolyte System

“…[1][2][3][4][5] The technique has been applied to produce a wide range of organic compounds. [6][7][8] Since usable electrochemical system requires conductive media throughout an electrical circuit, addition of salt, such as tetra-ammonium salts with long chain alkyl groups that are soluble in organic solvents, is required to promote conductivity and maintain current in the system. [9] Due to the fact that resistance of the organic media can be reduced by reducing distanced between the two electrodes and increasing the electrode surface area, the analytical scale Pt microelectrodes can be applied without addition of salt.…”

“…Electrochemical synthesis in organic media is widely recognized as reliable and cost effective approach with the recycling and monitoring capabilities . The technique has been applied to produce a wide range of organic compounds . Since usable electrochemical system requires conductive media throughout an electrical circuit, addition of salt, such as tetra‐ammonium salts with long chain alkyl groups that are soluble in organic solvents, is required to promote conductivity and maintain current in the system .…”