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

Abstract : 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.
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Submitted on : Monday, February 1, 2016 - 2:25:36 PM
Last modification on : Thursday, March 5, 2020 - 2:05:44 PM
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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, Elsevier, 2016, 191, pp.821-831. ⟨10.1016/j.electacta.2016.01.163⟩. ⟨hal-01263048⟩

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