Effect of anodic materials on solar photoelectro-Fenton process using a diazo dye as a model contaminant

Effect of electrochemically-driven technologies on the treatment of endocrine disruptors in synthetic and real urban wastewater

“…These results point to the key role played by two factors in accelerating the degradation of BPA: i) the in situ generation of homogeneous • OH radicals, derived from the Fenton reaction (3); and ii) the role of UVC light in the photolytic process described in reaction (20). The results obtained here are in agreement with the findings published previously in the literature which showed that the application of electro-Fenton techniques led to higher removal of organic persistent pollutants from water matrices [33,34].…”

“…These results allow one to infer that there is a transition from degradation kinetics limited by current to a degradation kinetics limited by the transport of pollutants toward the electrode surface. The excess of electrons in the process is consumed by parasitic reactions that do not lead to organic degradation reactions, but that consume/scavenge • OH radicals, as can be observed in reactions (22)(23)(24)(25)(26) and (31)(32)(33). Parasitic reactions affect the efficiency of the system and may unnecessarily increase the operational costs.…”

Mass transfer and residence time distribution in an electrochemical cell with an air-diffusion electrode: Effect of air pressure and mesh promoters

“…have shown great H2O2 production that allows an efficient  OH generation leading to a quick degradation and mineralization of POPs by EF and related processes [9][10][11][12][13]. This is feasible because a 3D ADE ensures a remarkably high efficiency for O2 reduction by reaction (1) since it is not limited by the mass transfer of the gas such as occurs with immersed cathodes that are feed with the dissolved O2 in solution.…”

“…The oxidation ability of EF and related processes also depends on the nature of the anode, which produces heterogeneous  OH at its surface from water discharge [3]. It has been found that nonactive BDD electrodes are the most powerful anodes, producing higher amounts of heterogeneous  OH than other materials and favoring the removal of organics, although the homogeneous  OH formed from reaction (2) is the preferred oxidizing agent [12,25].…”

Simultaneous persulfate activation by electrogenerated H2O2 and anodic oxidation at a boron-doped diamond anode for the treatment of dye solutions

“…In most articles focused on AO, the role of the cathode is disregarded, assuming that it only involves the side reduction reaction from H 2O or H + to H2. The situation is radically different when a carbonaceous cathode fed with O2 is employed, since the weak oxidant H2O2 (Eº = 1.76 V|SHE) is produced from reaction (2) (Brillas et al, 2009;Lanzalaco et al, 2017) giving rise to the AO-H2O2 process (Flores et al, 2016;Fajardo et al, 2019). Cathodes made of carbon felt (Panizza and Oturan, 2011;El Ghenymy et al, 2014) or carbon-polytetrafluoroethylene (PTFE) (El-Ghenymy et al, 2015;dos Santos et al, 2018ados Santos et al, , 2018bCampos et al, 2020) stand out when H2O2 production is intended for water treatment.…”