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Title: Contribution of cathodic hydroxyl radical generation to the enhancement of electro-oxidation process for water decontamination
Author: Medel, Alejandro
Treviño-Reséndez, José
Brillas, Enric
Meas, Yunny
Sirés Sadornil, Ignacio
Keywords: Depuració d'aigües residuals
Oxidació electroquímica
Purification of sewage
Electrolytic oxidation
Issue Date: 3-Dec-2019
Publisher: Elsevier Ltd
Abstract: The 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.
Note: Versió postprint del document publicat a:
It is part of: Electrochimica Acta, 2019, vol. 331, num. 135382
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ISSN: 0013-4686
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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