Evaluation of H2O2 electrogeneration and decolorization of Orange II azo dye using tungsten oxide nanoparticle-modified carbon

Author(s)

Paz, Edson C. ^{[1, 2]} ; Aveiro, Luci R. ^[1] ; Pinheiro, Victor S. ^[1] ; Souz, Felipe M. ^[1] ; Lima, Veronica B. ^{[3, 4]} ; Silva, Fernando L. ^{[3, 4]} ; Hammer, Peter ^[5] ; Lanza, V, Marcos R. ; Santos, Mauro C. ^[1]

Affiliation

^[1] Univ Fed Abc, CCNH, LEMN, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

^[2] IFMA Inst Fed Educ Ciencia & Tecnol Maranhao, Campus Acailandia, BR-65930000 Acailandia, MA - Brazil

^[3] V, Univ Sao Paulo, IQSC, Caixa Postal 780, BR-13566590 Sao Carlos, SP - Brazil

^[4] V, Unesp, Inst Quim, Inst Nacl Tecnol Alternat Deteccao Avaliacao Toxi, BR-14800900 Araraquara, SP - Brazil

^[5] Univ Estadual Paulista, Inst Quim, UNESP, BR-14800060 Araraquara, SP - Brazil

• Document type: Journal article
• Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 232, p. 436-445, SEP 15 2018.
• Web of Science Citations: 20

Abstract

In this paper, we report on the development of a new catalyst for H2O2 electrogeneration for the preparation of a gas diffusion electrode (GDE) for water treatment by electrochemical advanced oxidation processes (EAOPs). Catalysts based on tungsten oxide nanoparticles on Vulcan XC72 and Printex 6L carbons were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), contact angle measurements and oxygen reduction reaction (ORR) assays using a rotating ring-disk electrode (RRDE) system. The WO2.72/Vulcan XC72 (1% w/w of W) catalyst was used for the construction of a GDE due to its notable performance in H2O2 electrogeneration, its good current efficiency for H O-2(2) electrogeneration and its lower energy consumption. Thus, the WO2.72/Vulcan XC72 GDE cathode was combined with a Pt or boron-doped diamond (BDD) anode for the decolorization of 0.260 mM Orange II azo dye solutions by EAOPs. The decolorization efficiency was in the following sequence: photodegradation (PD) < Pt/anodic oxidation (AO) approximate to BDD/AO < BDD/electro-Fenton (EF) approximate to BDD/photoelectro-Fenton (PEF) < Pt/EF < Pt/PEF. The Orange II decolorization efficiency by Pt/PEF was equal to or higher than that reported in similar studies. Moreover, the results showed that an Orange II decolorization percentage of 77% in the PEF and EF processes with a Pt anode was due to the WO2.72/Vulcan XC72 cathode, showing that this catalyst is a promising candidate for application in EAOPs. (AU)

• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• 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: 16/01937-4 - Synthesis of binary metal oxides (Nb, Zr, Ta, Ru, Mo and Co) supported on amorphous carbon for the production of gas diffusion electrodes (GDE) for the electrosynthesis of H2O2 in situ in flow reactors.
• Grantee: Marcos Roberto de Vasconcelos Lanza
• 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