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Elimination of representative fluoroquinolones, penicillins, and cephalosporins by solar photo-Fenton: degradation routes, primary transformations, degradation improvement by citric acid addition, and antimicrobial activity evolution

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Abstract

This work studies the degradation of seven representative antibiotics (ciprofloxacin, norfloxacin, levofloxacin, oxacillin, cloxacillin, cefalexin, and cefadroxil) by solar photo-Fenton process. The removal of antibiotics by the individual components (i.e., light, H2O2, or Fe (II)) and the complete photochemical system (light/H2O2/Fe (II)) was initially evaluated. Then, the effect of citric acid addition to the photo-Fenton system was assessed. In the third place, the primary transformation products for two illustrative cases (ciprofloxacin and oxacillin treated by photo-Fenton) were determined. Also, photo-Fenton in the presence of citric acid was applied to remove antibiotics from a simulated hospital wastewater. It was found that the solar light component induced degradation of ciprofloxacin, norfloxacin, and levofloxacin, but the rest of the considered antibiotics were not reduced by photolysis. In turn, the photo-Fenton system showed a degrading action on all the tested antibiotics. The addition of citric acid to the system significantly increased the removal of antibiotics. Initial degradation products indicated that hydroxyl radical attacked moieties of antibiotics responsible for their antimicrobial activity. Finally, the treatment of hospital wastewater evidenced the high potentiality of photo-Fenton process for degrading antibiotics in aqueous matrices containing elevated concentrations of citric acid.

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Funding

The authors received support provided to their research group through “Programa de Sostenibilidad” from Universidad de Antioquia UdeA and financing from MINCIENCIAS COLOMBIA (before named COLCIENCIAS) through the project No. 111577757323 (Convocatoria 777 de 2017). EA Serna-Galvis also received his doctoral scholarship (Convocatoria 647 de 2014) from MINCIENCIAS COLOMBIA provided from July 2015 to June 2019.

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Correspondence to Efraim A. Serna-Galvis or Ricardo A. Torres-Palma.

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Responsible Editor: Vítor Pais Vilar

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Serna-Galvis, E.A., Cáceres-Peña, A. & Torres-Palma, R.A. Elimination of representative fluoroquinolones, penicillins, and cephalosporins by solar photo-Fenton: degradation routes, primary transformations, degradation improvement by citric acid addition, and antimicrobial activity evolution. Environ Sci Pollut Res 27, 41381–41393 (2020). https://doi.org/10.1007/s11356-020-10069-8

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  • DOI: https://doi.org/10.1007/s11356-020-10069-8

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