MnO2/Vulcan-Based Gas Diffusion Electrode for Mineralization of Diazo Dye in Simulated Effluent

Author(s)

Aveiro, L. R. ^{[1, 2]} ; da Silva, A. G. M. ^[3] ; Candido, E. G. ^[3] ; Paz, E. C. ^[1] ; Pinheiro, V. S. ^[1] ; Parreira, L. S. ^[3] ; Souza, F. M. ^[1] ; Antonin, V. S. ^[1] ; Camargo, P. H. C. ^[3] ; dos Santos, M. C. ^[1]

Affiliation

^[1] Fed Univ ABC, Ctr Nat & Human Sci, Lab Electrochem & Nanostruct Mat, St Andre - Brazil

^[2] Fed Inst Educ Sci & Technol Sao Paulo, IFSP, Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Inst Chem, Av Prof Lineu Prestes 748, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: ELECTROCATALYSIS; v. 11, n. 3 JAN 2020.
• Web of Science Citations: 0

Abstract

Treatments of simulated effluent solutions containing the Reactive Black 5 (RB5) were carried out by electrochemical, photoelectrochemical, electro-Fenton and photoelectro-Fenton methods using a one-compartment cell with a boron-doped diamond anode and a 3% of manganese dioxide nanoflowers supported on a carbon Vulcan XC72 gas diffusion electrode cathode. In the photo-assisted processes, the solution was irradiated using a 40-W UVC lamp immersed in the treated solution. For Fenton-based processes, only 5 min was required to attain 95% (photoelectro-Fenton) and 93% (electro-Fenton) RB5 dye degradation. When conversion to CO2 is taken into account after 6-h treatment, electrochemical method mineralized 13% of the organic load whereas removals greater than 90% were attained using the Fenton-based processes. These completely different results can be explained by the distinct spatial availability of the generated hydroxyl radical: only near the anode surface as in electrochemical-based processes or added to those distributed across the solution bulk as in Fenton-based processes. Graphical (a) Percentage of colour removal at lambda = 596 nm and (b) Removal of TOC % vs electrolysis time. Methods: (black square) EF-BDD (1), (red circle) EFPA-BDD, (blue up-pointing triangle) AO-BDD, (white square) EF-BDD (2) and (white circle) EF-BDD (3). In the EFPA-BDD systems, the solution was irradiated with a 46-W UVC lamp at lambda = 254 nm. (AU)

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