Lead Oxide-Modified Graphite Electrodes for Electrochemical Degradation of Congo Red Dye in Aqueous Solution

Résumé

Abstract Congo red dye (CR) dye in aqueous solution was decolorized by an electrolysis process using graphite and lead dioxide modified graphite (G/PbO2) as anode materials. The electrodeposited lead dioxide film was characterised by means of SEM EDS. Comparative performance assessment of the anode materials under different process parameters reveals that the lead dioxide film improved electro catalytic effect of the modified electrode. The adjustment of the deposition bath pH from 1.5 to 3 resulted to formation of uniform agglomeration and disappearance of particulates as well as the better adhesion of film to substrate. The degradation rate (DR) observed for the G/PbO2 was higher than for the unmodified graphite electrode. Increase in applied voltage from 25 to 30 V at 23mA/mm2, improved degradation efficiency (DE) from 84.7–91.32% for graphite and from 96.09–99.98% and for G/PbO2 respectively with 1 M KCl. The optimum degradation time of 45 mins was recorded for graphite anode system which reduced to 30 mins with G/PbO2 anode electrolytic cell. CR degraded to compounds with smalle r molecular weights and better stability as observed with GC MS analysis and computational total energy study respectively. The modification of the graphite electrode surface by electrodepositing PbO2 film improved the DE and optimum reaction time. These findings carry significant implications for the design of advanced electrocatalytic systems in environmental and wastewater treatment applications.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0