Application and stability of cathodes with manganese dioxide nanoflowers supported on Vulcan by Fenton systems for the degradation of RB5 azo dye

Author(s):Show less -

Aveiro, L. R. ^[1] ; Da Silva, A. G. M. ^[2] ; Candido, E. G. ^[2] ; Antonin, V. S. ^{[1, 3]} ; Parreira, L. S. ^[2] ; Papai, R. ^[1] ; Gaubeur, I ^[1] ; Silva, Fernando L. ^[3] ; Lanza, V, M. R. ; Camargo, P. H. C. ^[2] ; Santos, M. C. ^[1]

Affiliation

^[1] Fed Univ ABC, UFABC, Ctr Nat & Human Sci, Lab Electrochem & Nanostruct Mat, BR-09210170 St Andre - Brazil

^[2] Univ Sao Paulo, Inst Chem, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil

^[3] V, Univ Sao Paulo, Inst Chem Sao Carlos, Av Prof Lineu Prestes 748, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Chemosphere; v. 208, p. 131-138, OCT 2018.
• Web of Science Citations: 8

Abstract

This work describes the electrochemical degradation of Reactive Black 5 (RB5) by two methods: electrochemical and photo-assisted electrochemical degradation with and without a Fenton reagent. Two anodes were used, Pt and boron-doped diamond (BDD, 2500 ppm), and the cathode was 3% MnO2 nanoflowers (NFMnO2) on a carbon gas diffusion electrode (GDE). An electrochemical cell without a divider with a GDE with 3% w/w NFMnO2/C supported on carbon Vulcan XC72 was used. The decolorization efficiency was monitored by UV-vis spectroscopy, and the degradation was monitored by Total Organic Carbon (TOC) analysis. For dissolution monitoring, aliquots (1 mL) were collected during the degradation. After 6 h of H2O2 electrogeneration, the manganese concentration in the RB5 solution was only 23.1 +/- 1.214 mu g L-1. It was estimated that approximately 60 mu g L-1 (<0.2%) of manganese migrated from the GDE to the solution after 12 h of electrolysis, which indicated the good stability of the GDE. The photoelectro-Fenton-BDD (PEF-BDD) processes showed both the best color removal percentage (similar to 93%) and 91% of mineralization. The 3% NFMnO2/C GDE is promising for RB5 degradation. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 16/00819-8 - Controlled Synthesis of Nanomaterials based on Pd and Pt: Electrocatalytic Activity and Stability
• Grantee: Luanna Silveira Parreira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/10314-8 - Nanostructures for Phenol, Ciprofloxacin and 17±-ethinylestradiol Degradation
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants