ror.org/04je6yw13
Abstracts
Résumé
Ce travail est une comparaison des capacités d’électro-oxydation du cristal violet sur des électrodes de Ti/TiO2 et Ti/IrO2-RuO2. Les résultats révèlent que le dépôt d’oxyde de métaux semi-conducteurs sur un support métallique adéquat tel que le titane permet d’améliorer l’activité électrochimique de ces électrodes. De même que l’influence des paramètres opératoires que sont la densité de courant (4,4, à 6,6 mA∙cm-2), la concentration de l’électrolyte (0,5 à 1,5 g∙L-1), la concentration initiale du colorant (2,5 x 10-5 à 10-4 M) et la surface d’électrode (4,55, 5,85 et 7,15 cm2) sur l’efficacité du traitement serait liée à la nature de l’électrode. Le suivi de la demande chimique en oxygène (DCO) au cours de l’électrolyse montre que Ti/IrO2-RuO2 possède le meilleur rendement épuratoire, puisqu’il permet d’atteindre un taux de réduction de la DCO de 92 % comparativement à un taux de 83 % enregistré dans le cas de Ti/TiO2 au bout de 2 h de traitement.
Mots-clés :
- électro-oxydation,
- cristal violet,
- oxyde de métaux,
- demande chimique en oxygène,
- paramètres opératoires
Abstract
The degradation of crystal violet in aqueous solution has been studied by an electro-oxidation process using Ti/TiO2 and Ti/IrO2-RuO2 anode electrodes. The study reveals that the deposition of metal oxide on a suitable metal support, such as pure titanium, improves the electrochemical activity of the electrodes. Different operating parameters were investigated such as current density (4.4 to 6.6 mA∙cm-2), initial concentration of dye (2.5 x 10-5 to 10-4 M), supporting electrolyte concentration (0.5 to 1.5 g∙L-1) and electrode surface (4.55, 5.85 and 7.15 cm2). The best performances of the electrolytic system were recorded using Ti/IrO2-RuO2 and 92% of COD could be removed in 2 h. By comparison, a maximum of 83% of COD could be removed using Ti/TiO2 for a similar imposed treatment time of 2 h.
Keywords:
- electro-oxidation,
- crystal violet,
- metal oxide,
- chemical oxygen demand,
- operating parameters
Appendices
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