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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 232, p. 436-445, SEP 15 2018.
• Citações Web of Science: 20

Resumo

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)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/10314-8 - Nanoestruturas para a Degradação de Fenol, Ciprofloxacino e 17 alfa etinilestradiol
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/01937-4 - Síntese de óxidos binários de metais (Nb, Zr, Ta, Ru, Mo e Co) suportados em carbono amorfo para a produção de eletrodos de difusão gasosa (EDG) para a eletrossíntese de H2O2 in situ em reatores de fluxo.
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/21846-6 - Nanoestruturas para a remediação ambiental e produção de energia a partir de fontes renováveis
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular