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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1361-1369
Number of pages9
JournalJournal of Applied Electrochemistry
Volume44
Issue number12
DOIs
Publication statusPublished - 1 Dec 2014

Keywords

  • Membranes absorption
  • Sulfite electrooxidation
  • Wine

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Electrochemistry

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