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Title: | Treatment of antibiotic cephalexin by heterogeneous electrochemical Fenton-based processes using chalcopyrite as sustainable catalyst |
Author: | Droguett, Constanza Salazar, Ricardo Brillas, Enric Sirés Sadornil, Ignacio Carlesi, Carlos Marco, José F. Thiam, Abdoulaye |
Keywords: | Antibiòtics Depuració d'aigües residuals Oxidació electroquímica Antibiotics Purification of sewage Electrolytic oxidation |
Issue Date: | 11-Jun-2020 |
Publisher: | Elsevier B.V. |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2020.140154 |
It is part of: | Science of the Total Environment, 2020, vol. 740, p. 140154 |
URI: | http://hdl.handle.net/2445/167138 |
Related resource: | https://doi.org/10.1016/j.scitotenv.2020.140154 |
ISSN: | 0048-9697 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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