Dépôt numérique

Ciprofloxacin removal via sequential electro-oxidation and enzymatic oxidation.

Cuprys, Agnieszka, Thomson, Paisley, Ouarda, Yassine, Suresh, Gayatri, Rouissi, Tarek, Brar, Satinder Kaur, Drogui, Patrick ORCID: https://orcid.org/0000-0002-3802-2729 et Surampalli, Rao Y. (2020). Ciprofloxacin removal via sequential electro-oxidation and enzymatic oxidation. Journal of Hazardous Materials , vol. 389 . p. 121890. DOI: 10.1016/j.jhazmat.2019.121890.

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The combination of electro-oxidation and enzymatic oxidation was tested to evaluate the potency of this system to remove ciprofloxacin (CIP), a fluoroquinolone antibiotic, from water. For the electro-oxidation boron-doped diamond (BDD) and mixed metal oxides anodes were tested, at three current densities (4.42, 17.7 and 35.4 A/cm²). BDD anode at 35.4 A/cm² exhibited the highest removal efficiency in the shortest time (>90 % removal in 6 min). For the enzymatic oxidation, laccase from Trametes versicolor was chosen. Laccase alone was not able to remove CIP; hence the influence of redox mediators was investigated. The addition of syringaldehyde (SA) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) resulted in enhanced CIP transformation. About 48.9±4.0 % of CIP remained after 4 h of treatment when SA-mediated laccase was applied and 87.8±6.6 % in the case of ABTS-mediated laccase. The coupling of enzymatic oxidation followed by electro-oxidation led to 73 % removal of the antibiotic. Additionally, the antimicrobial activity increased up to its original efficiency after the treatment. The combination of electro-oxidation followed by enzymatic oxidation led to 97–99 % removal of CIP. There was no antimicrobial activity of the solution after the treatment. The tests with wastewater confirmed the efficacy of the system to remove CIP from the complex matrix.

Type de document: Article
Mots-clés libres: ciprofloxacin; electro-oxidation; laccase; syringaldehyde; wastewater
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 mars 2021 20:13
Dernière modification: 15 févr. 2022 16:34
URI: https://espace.inrs.ca/id/eprint/11401

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