Electrocatalytic reduction of metronidazole using titanocene/Nafion®-modified graphite felt electrode - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2016

Electrocatalytic reduction of metronidazole using titanocene/Nafion®-modified graphite felt electrode

Résumé

The main objective of this study was to examine the feasibility of an electrocatalytic reduction on titanocene/Nafion®-modified graphite felt electrode, as pretreatment, before a biological treatment, for the degradation of metronidazole, a nitro biorecalcitrant pollutant. A titanium complex, know as an effective catalyst in the reduction of nitro groups, was immobilized on the electrode surface by encapsulation into a Nafion® film. The different operating conditions used to prepare the modified electrode, i. e. the initial concentrations of catalyst and Nafion® and the sonication time, were optimized and the modification of the electrode was highlighted by cyclic voltammetry and electronic scanning microscopy coupled with energy dispersive spectroscopy analysis. The results show a good stability and reproducibility of the modified electrode. Flow heterogeneous catalytic reduction of metronidazole was then carried out with the titanocene/Nafion®-modified graphite felt as working electrode. The HPLC analysis underlined the total reduction of metronidazole after 1 hour and the evolution of the biological oxygen demand to chemical oxygen demand ratio showed a significant increase of biodegradability from 0.06 before pretreatment to 0.35 ± 0.05 after electrolysis on the modified graphite felt electrode. The comparison of both homogeneous and heterogeneous reactions underlined the interest of the immobilization process that led to a higher stability of the catalyst, giving rise to a higher turnover number and an improvement of biodegradability. The stability of the modified electrode was investigated after electrolysis by cyclic voltammetry and successive electrolyses.

Domaines

Chimie
Fichier principal
Vignette du fichier
Electrocatalytic reduction of metronidazole_accepted.pdf (502.75 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01263048 , version 1 (01-02-2016)

Identifiants

Citer

I. Saidi, Isabelle Soutrel, Florence Fourcade, Abdeltif Amrane, N. Bellakhal, et al.. Electrocatalytic reduction of metronidazole using titanocene/Nafion®-modified graphite felt electrode. Electrochimica Acta, 2016, 191, pp.821-831. ⟨10.1016/j.electacta.2016.01.163⟩. ⟨hal-01263048⟩
75 Consultations
240 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More