2026-04-18T05:59:16Zhttps://recercat.cat/oai/request
oai:recercat.cat:2445/1671382025-12-04T20:59:31Zcom_2072_1057col_2072_478796col_2072_478917
RECERCAT author Droguett, Constanza author Salazar, Ricardo author Brillas, Enric author Sirés Sadornil, Ignacio author Carlesi, Carlos author Marco, José F. author Thiam, Abdoulaye 2020-07-01T13:11:48Z2022-06-11T05:10:19Z2020-06-112020-07-01T13:11:49Z The development of heterogeneous Fenton-based electrochemical advanced oxidation processes is important for the removal of organic pollutants at industrial level in the near future. This work reports the application of heterogeneous photoelectro-Fenton (HPEF) with UVA light as an enhanced alternative to the more widespread heterogeneous electro-Fenton (HEF) process. The treatment of the antibiotic cephalexin using chalcopyrite as a sustainable catalyst was studied using an undivided IrO2/air-diffusion cell. XPS analysis showed the presence of Fe(III), Cu(I) and Cu(II) species on the surface. The amount of Fe2+ ions dissolved upon chalcopyrite exposure to continuous stirring and air bubbling was proportional to chalcopyrite content. In all cases, the occurrence of pH self-regulation to an optimum value near 3 was observed. The HEF and HPEF treatments of 100 mL of 50 mg L-1 cephalexin solutions with 0.050 M Na2SO4 have been studied with 1.0 g L-1 chalcopyrite at 50 mA cm-2. Comparative homogeneous EF and PEF with dissolved Fe2+ and Cu2+ catalysts were also performed. The HPEF process was the most effective process, which can be mainly explained by the larger production of homogeneous and heterogeneous ●OH and the photodegradation of the complexes of iron with organics. The effect of applied current and catalyst concentration on HPEF performance was assessed. Recycling experiments showed a long-term stability of chalcopyrite. Seven initial aromatics and six cyclic by-products of cephalexin were identified, and a plausible degradation route that also includes five final carboxylic acids is proposed. cc-by-nc-nd (c) Elsevier B.V., 2020 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess Antibiòtics Depuració d'aigües residuals Oxidació electroquímica Antibiotics Purification of sewage Electrolytic oxidation Treatment of antibiotic cephalexin by heterogeneous electrochemical Fenton-based processes using chalcopyrite as sustainable catalyst info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion