Electrooxidation of sulfide by cobalt pentacyanonitrosylferrate film on glassy carbon electrode by cyclic voltammetry

Autor(es)

Paim, Leonardo L. ^[1] ; Stradiotto, Nelson R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 55, n. 13, p. 4144-4147, MAY 1 2010.
• Citações Web of Science: 33

Resumo

A glassy carbon (GC) electrode was modified with cobalt pentacyanonitrosylferrate (CoPCNF) film. Cyclic voltammetry (CV) of the CoPCNF onto the GC (CoPCNF/GC) shows a redox couple (Fe(III)/Fe(II)) with a standard potential (E(0)') of 580 mV. The current ratio I(pa)/I(pc), remains almost 1, and a peak separation (Delta E(p)) of 106 mV is observed in 0.5 M KNO(3) as the supporting electrolyte. Anodic peak currents were found to be linearly proportional to the scan rate between 10 and 200 mVs(-1), indicating an adsorption-controlled process. The redox couple of the CoPCNF film presents an electrocatalytic response to sulfide in aqueous solution. The analytical curve was linear in the concentration range of 7.5 x 10(-5) to 7.7 x 10(-4) M with a detection limit of 4.6 x 10(-5) M for sulfide ions in 0.5 M KNO(3) solution. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 04/09326-7 - Aplicação da espectroscopia de fotoelétrons induzida por raios-X (XPS) em nanomateriais, sensores e cerâmicas
• Beneficiário: Celso Valentim Santilli
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 07/07700-7 - Desenvolvimento de sensores baseados em eletrodos modificados com pentacianonitrosilferratos para determinação de compostos sulfurados em gás natural
• Beneficiário: Leonardo Lataro Paim
• Modalidade de apoio: Bolsas no Brasil - Doutorado