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oai:recercat.cat:2445/1671382025-12-04T20:59:31Zcom_2072_1057col_2072_478796col_2072_478917

Treatment of antibiotic cephalexin by heterogeneous electrochemical Fenton-based processes using chalcopyrite as sustainable catalyst Droguett, Constanza Salazar, Ricardo Brillas, Enric Sirés Sadornil, Ignacio Carlesi, Carlos Marco, José F. Thiam, Abdoulaye Antibiòtics Depuració d'aigües residuals Oxidació electroquímica Antibiotics Purification of sewage Electrolytic oxidation 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. 2020-07-01T13:11:48Z 2022-06-11T05:10:19Z 2020-06-11 2020-07-01T13:11:49Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2020.140154 Science of the Total Environment, 2020, vol. 740, p. 140154 https://doi.org/10.1016/j.scitotenv.2020.140154 cc-by-nc-nd (c) Elsevier B.V., 2020 http://creativecommons.org/licenses/by-nc-nd/3.0/es info:eu-repo/semantics/openAccess Elsevier B.V. Articles publicats en revistes (Ciència dels Materials i Química Física)