Hydrogen Peroxide Electrogeneration by Gas Diffusion Electrode Modified with Tungsten Oxide Nanoparticles for Degradation of Orange II and Sunset Yellow FCF Azo Dyes

Author(s)

Paz, Edson C. ^{[1, 2]} ; Pinheiro, Victor S. ^[2] ; Aveiro, Luci R. ^[2] ; Souza, Fernanda L. ^[2] ; Lanza, V, Marcos R. ; Santos, Mauro G. ^[2]

Affiliation

^[1] Inst Fed Educ Ciencia & Tecnol Maranhao IFMA, Campus Acailandia, R Projetada S-N, BR-65930000 Acailandia, MA - Brazil

^[2] Univ Fed ABC UFABC, LEMN, CCNH, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 30, n. 9, p. 1964-1975, SEP 2019.
• Web of Science Citations: 0

Abstract

In this work, the gas diffusion electrode (GDE) cathode of Vulcan XC72 carbon modified with nanoparticles of WO2.72 (WO2.72 / Vulcan XC72) was used for H2O2 electrogeneration and degradation of 350 mL of Orange II (OH) and Sunset Yellow FCF (SY) azo dyes by electro-Fenton (EF) and photoelectro-Fenton (PEF) processes with different Fe2+ initial content (1.00, 0.50 and 0.25 mmol L-1). The WO2.72 / Vulcan XC72 GDE electrolyzed approximately 3 times more H2O2 than the Vulcan XC72 GDE. Decolorizations and mineralizations of the dye solutions were more efficient at higher concentrations of Fe2+. The decolorization decay showed pseudo-first-order kinetics. The most promising decolorization results obtained at processes of WO2.72 / Vulcan XC72 cathode combined with Pt anode (100% color removal of OII and SY at 30 and 20 min of electrolysis with 1.00 mmol L-1 Fe2+, respectively). The best mineralization achieved in trials of WO2.72 / Vulcan XC72 cathode combined with boron-doped diamond (BDD) anode (82% total organic carbon (TOC) removal of OII by PEF / 1.00 after 3 h and 90% TOC removal of SY by PEF / 050 after 4 h). It was found that SY decolorization was faster and mineralization showed a similar yield independent of oxidized dye. (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 type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 17/26288-1 - Hybrid electrocatalysts based on Pd, Pt and Sn nanoparticles, and on ceria nanorods for application in fuel cells
• Grantee: Victor dos Santos Pinheiro
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/10314-8 - Nanostructures for Phenol, Ciprofloxacin and 17±-ethinylestradiol Degradation
• Grantee: Mauro Coelho dos Santos
• Support type: Regular Research Grants
• FAPESP's process: 17/22976-0 - Development of palladium and niobium nanoelectrocatalysts for alkaline direct ethanol fuel cells
• Grantee: Felipe de Moura Souza
• Support type: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
• Grantee: Mauro Coelho dos Santos
• Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants