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Electro-generation of hydrogen peroxide using a graphite cathode from exhausted batteries: study of influential parameters on electro-Fenton process.

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Diouf, Ibrahima; Dia, Oumar; Diedhiou, Moussa Bagha; Drogui, Patrick; Toure, Alpha Ousmane; Lo, Sidy Mambaye; Rumeau, Michel; Mar/Diop, Codou Gueye (2020). Electro-generation of hydrogen peroxide using a graphite cathode from exhausted batteries: study of influential parameters on electro-Fenton process. Environmental Technology , vol. 41 , nº 11. p. 1434-1445. DOI: 10.1080/09593330.2018.1537309.

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Résumé

In this work, the study of hydrogen peroxide (H₂O₂) electro-generation using graphite from exhausted batteries (Gr-Bat) was conducted. Linear sweep voltammetry and electrolysis experiments were carried out in a single compartment electrochemical cell. Study of the possibility to use this electrode revealed that it presents, as vitreous carbon (VC) electrode, a reduction of oxygen with two successive waves (bi-electronic reduction). The first wave corresponds to the reduction of O₂ to H₂O₂, while the second one corresponds to the reduction of H₂O₂ to H₂O. The cathodic potentials for electro-generation of H₂O₂ appeared at −600 and –700 mV vs. Ag/AgCl for Gr-Bat and VC electrodes, respectively. Subsequently, electrolysis experiments were conducted by imposing the potentials required for H₂O₂ formation. The effect of several operating parameters on H₂O₂ production, such as the nature and concentration of the electrolyte, the pH, the presence of ferrous ions and O₂ injection were studied using Gr-Bat and VC electrodes, respectively. For both electrodes, the acidic medium was more favorable for H₂O₂ electro-generation. The oxygen injection in solution promoted an increase of H₂O₂ concentration, but its effect was more pronounced in the case of VC electrode. Application for crystal violet degradation by electro-Fenton revealed that Gr-Bat had the best purification performance. A removal rate of 73.18% was obtained with Gr-Bat electrode against 62.27% with VC electrode for an electrolysis time of 120 min. This study has demonstrated the possibility of recycling Gr-Bat by using them as cathode materials in the electro-Fenton process.

Type de document: Article
Mots-clés libres: exhausted batteries; hydrogen peroxide; electro-Fenton; electro-reduction of O₂; crystal violet
Centre: Centre Eau Terre Environnement
Date de dépôt: 04 déc. 2019 15:26
Dernière modification: 21 avr. 2020 14:43
URI: http://espace.inrs.ca/id/eprint/9599

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