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2019-12-03

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cc-by-nc-nd (c) Elsevier Ltd, 2019
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/153081

Contribution of cathodic hydroxyl radical generation to the enhancement of electro-oxidation process for water decontamination

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Recurs relacionat

https://doi.org/10.1016/j.electacta.2019.135382

Resum

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.

Matèries

Depuració d'aigües residuals, Oxidació electroquímica

Matèries (anglès)

Purification of sewage, Electrolytic oxidation

Citació

Col·leccions

Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

MEDEL, Alejandro, et al. Contribution of cathodic hydroxyl radical generation to the enhancement of electro-oxidation process for water decontamination. Electrochimica Acta. 2019. Vol. 331, num. 135382. ISSN 0013-4686. [consulted: 15 of August of 2026]. Available at: https://hdl.handle.net/2445/153081

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