Evidences of the Electrochemical Production of Sulfate Radicals at Cathodically Polarized TiO2 Nanotubes Electrodes

Autor(es)

Bessegato, Guilherme G. ^{[1, 2, 3]} ; Boldrin Zanoni, Maria Valnice ^[1] ; Tremiliosi-Filho, Germano ^[3] ; Lindino, Cleber A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Inst Quim, Ave Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil

^[2] Univ Estadual Oeste Parana Unioeste, Ctr Engn & Ciencias Exatas, Rua Fac 645, BR-85903000 Toledo, PR - Brazil

^[3] Univ Sao Paulo, Inst Quim Sao Carlos, Ave Trabalhador Saocarlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ELECTROCATALYSIS; v. 10, n. 3, p. 272-276, MAY 2019.
• Citações Web of Science: 0

Resumo

This work presents a novel approach for cathodically polarized TiO2 nanotube electrodes in electrochemical advanced oxidation processes generating sulfate radicals. Although TiO2 do not offer electrochemical response at the anodic region in the dark, its simple self-doping can enable oxidation capacity. Cathodically polarized TiO2 electrode (CP-TNT) was applied in the electrolysis of p-nitrosodimethylaniline dye in sulfate and nitrate aqueous electrolytes, showing much better decolorization efficiency in the presence of sulfate ions. Another evidence of SO4 center dot- generation was the detection of persulfate ions (SO4 center dot-+SO4 center dot-S2O82-) formed during bulk electrolysis of a sulfate aqueous solution (38molL(-1) S2O82- after 30min). These results open the way for application of CP-TNT electrodes in EAOPs as an alternative for highly cost anodes for electrochemical generation of active sulfate species for degradation of organic contaminants. (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: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático