Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/23451
Type: Artigo de periódico
Title: Estudo eletroquímico do azul de metileno adsorvido sobre sílica gel quimicamente modificada com óxido de nióbio
Title Alternative: Electrochemical study of methylene blue adsorbed on the silica gel modified with niobium oxide
Author: Schiavo, Débora de Almeida
Perez, Elizabeth Fátima
Kubota, Lauro Tatsuo
Abstract: Methylene blue (AM) was immobilised on surface of the silica gel modified with niobium oxide. This material was incorporated in a carbon paste electrode, which showed a redox couple in a potential of E= -113 mV vs SCE in KCl solution at pH 7.0. The formal potential, in 0.5 mol L-1 KCl at pH 7.0, shifted about 290 mV towards more positive values compared to those observed for AM solubilized in aqueous solution. The dependence on the formal potential with solution pH between 2 and 7 was much lower than those observed for AM solubilized in aqueous solution.
Subject: methylene blue
silica gel modified with niobium oxide
carbon paste electrode
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0100-40422000000600018
Address: http://dx.doi.org/10.1590/S0100-40422000000600018
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422000000600018
Date Issue: 1-Dec-2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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