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

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...

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Bibliographic Details
Published in:Electrocatalysis 2020-05, Vol.11 (3), p.268-274
Main Authors: Aveiro, L. R., da Silva, A. G. M., Candido, E. G., Paz, E. C., Pinheiro, V. S., Parreira, L. S., Souza, F. M., Antonin, V. S., Camargo, P. H. C., dos Santos, M. C.
Format: Article
Language:English
Subjects:
Anodes
Boron
Catalysis
Chemistry
Chemistry and Materials Science
Diamonds
Dyes
Electrochemistry
Electrodes
Energy Systems
Gaseous diffusion
Hydroxyl radicals
Manganese dioxide
Mineralization
Organic loading
Original Research
Physical Chemistry
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Summary: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 CO 2 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 Abstract (a) Percentage of colour removal at λ  = 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 λ  = 254 nm.
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-020-00583-1