Medel, AlejandroTreviño-Reséndez, JoséBrillas, EnricMeas, YunnySirés Sadornil, Ignacio2020-03-192021-12-032019-12-030013-4686https://hdl.handle.net/2445/153081The degradation of organic pollutants in water by electro-oxidation (EO) process is a very active research topic, but it has been pre-eminently focused on the development of anodes with enhanced electrocatalytic ability to produce ●OH at their surface. Conversely, the degradation pathways that may arise from the potential ●OH production at the cathode surface are often disregarded. This work discusses the contribution of ●OH, formed at a Ti, graphite, stainless steel or Pt cathode from the reduction of O2 or H2O2, to phenol oxidation in 0.5 mol dm-3 H2SO4 medium. The OH production in the cathodic compartment of a divided cell was assessed from coumarin oxidation monitored via UV/Vis spectroscopy and HPLC with a fluorescence detector, salicylic acid oxidation evaluated by HPLC with a photodiode array detector and electron paramagnetic resonance. It was demonstrated that the production depended on the cathode nature, decreasing as: Pt > graphite >> stainless steel > Ti. It was concluded that a two-electron reaction converted O2 to H2O2, which was monoelectronically reduced to ●OH. The results reveal the importance of cathode selection in water treatment by EO.application/pdfengcc-by-nc-nd (c) Elsevier Ltd, 2019http://creativecommons.org/licenses/by-nc-nd/3.0/esDepuració d'aigües residualsOxidació electroquímicaPurification of sewageElectrolytic oxidationinfo:eu-repo/semantics/article6938872020-03-19info:eu-repo/semantics/openAccess