A glassy carbon electrode modified by a copolymer of Co-tetrakis (para-aminophenyl)porphyrin and ortho-phenylenediamine. Characterization and electrocatalytic sulfite oxidation behavior of a basic extract from red wine

Roxana Arce, Julio Romero, María J. Aguirre

Resultado de la investigación: Contribución a una revistaArtículo

5 Citas (Scopus)

Resumen

In this work, we present a comparison among three glassy carbon electrodes modified by Co-porphyrin, ortho-phenylenediamine, or both simultaneously. This comparison shows the differences among the electrochemical behavior, morphological characteristics and electrocatalytic behavior toward the sulfite oxidation of these electrodes. The electrode modified by Co-porphyrin, ortho-phenylenediamine and copolymer has been investigated in detail for the comparision of electrocatalytic activity towards the sulfite oxidation. In the case of the glassy carbon-modified electrodes, the presence of the copolymer enhances the electrocatalytic performance of the modified electrodes in spite of the non-catalytic response (compared to the bare glassy carbon) of both homopolymer-modified electrodes toward the oxidation of sulfite. Additionally, the oxidation of sulfite extracted from red wine is shown. The copolymer-modified electrode is capable of oxidizing the extracted free sulfite in a 0.02 M NaOH solution. Through the addition of standards method, a concentration of free sulfite in a Chilean red wine sample was determined to be 44 ppm.

Idioma originalInglés
Páginas (desde-hasta)1361-1369
Número de páginas9
PublicaciónJournal of Applied Electrochemistry
Volumen44
N.º12
DOI
EstadoPublicada - 1 dic 2014

Áreas temáticas de ASJC Scopus

  • Ingeniería química (todo)
  • Química de los materiales
  • Electroquímica

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