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Type: Artigo de periódico
Title: Preparation and electrochemical behavior of the CA/TiO2/Sb2O5 composite electrode modified with p-benzoquinone
Author: da Rocha, AAH
Pires, EB
Nectoux, AD
Dias, SLP
Lima, EC
Radtke, C
Kubota, LT
Abstract: In this present study, a novel material made up of p-benzoquinone (BQ) immobilized on a new composite of cellulose acetate and mixed metal oxides (CA/TiO2/Sb2O5) was applied to the electrocatalytic oxidation of ascorbic acid (H(2)AA). The material was prepared by a phase inversion process and characterized by several techniques including scanning electronic microscopy coupled with energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence. Ti and Sb mapping profiles on the surface showed a homogeneous distribution of the matrices. Ti-2p and Sb-3d doublet indicate that the formation of TiO2 and Sb2O5 is the presumed responsible for the good rigidity of the polymeric matrix. A carbon paste electrode of this material was used to study the electrocatalytic oxidation of ascorbic acid by cyclic voltammetric, chronoamperometric and differential pulse techniques. The electrode had a quick response time, showing great potential to be utilized as an electrochemical sensor for the determination of ascorbic acid in commercial samples. (C) 2012 Elsevier B.V. All rights reserved.
Subject: p-Benzoquinone
Modified cellulose acetate
Titanium dioxide
Antimony pentoxide
Carbon paste electrode
Ascorbic acid
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.jelechem.2012.11.019
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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