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

Authors
  • Bessegato, Guilherme G.1, 2, 3
  • Zanoni, Maria Valnice Boldrin2
  • Tremiliosi-Filho, Germano3
  • Lindino, Cleber A.1
  • 1 Universidade Estadual do Oeste do Paraná (Unioeste), Centro de Engenharias e Ciências Exatas, Rua da Faculdade, 645, Toledo, PR, 85903-000, Brazil , Toledo (Brazil)
  • 2 Universidade Estadual Paulista (Unesp), Instituto de Química, Araraquara, Av. Prof. Francisco Degni, 55, Araraquara, SP, 14800-060, Brazil , Araraquara (Brazil)
  • 3 Universidade de São Paulo (USP), Instituto de Química de São Carlos, Avenida Trabalhador Sãocarlense, 400, São Carlos, SP, 13566-590, Brazil , São Carlos (Brazil)
Type
Published Article
Journal
Electrocatalysis
Publisher
Springer US
Publication Date
Mar 28, 2019
Volume
10
Issue
3
Pages
272–276
Identifiers
DOI: 10.1007/s12678-019-00525-6
Source
Springer Nature
Keywords
License
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Abstract

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•− generation was the detection of persulfate ions (SO4•− + SO4•− → S2O82−) formed during bulk electrolysis of a sulfate aqueous solution (38 μmol L−1 S2O82− after 30 min). 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. Graphical Abstract

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