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Type: Artigo de periódico
Title: Copper (ii) Adsorbed On Sio(2)/sno(2) Obtained By The Sol-gel Processing Method: Application As Electrochemical Sensor For Ascorbic Acid.
Author: Kurihara, Lincoln A
Fujiwara, Sergio T
Alfaya, Rení V S
Gushikem, Yoshitaka
Alfaya, Antonio A S
de Castro, Sandra C
Abstract: With the objective of producing a material showing better conductive properties to be used as a support for electroactive species, a SiO(2)/SnO(2) mixed oxide was prepared. The procedure for SiO(2)/SnO(2) mixed oxide preparation using the sol-gel processing method, starting from tetraethylorthosilicate and SnI(4) as precursor reagents, is described. SiO(2)/SnO(2) with composition Sn=15.6 wt% and S(BET) = 525 m(2)g(-1), V(p)=0.28 mlg(-1), and D(p)= 1.5 nm, where S(BET), V(p) and D(p) are the specific surface area, the average pore volume, and the average pore diameter, respectively, was obtained. The X-ray photoelectron spectroscopy showed that the mixed oxide was thermally very stable for samples heat-treated at up to 1073 K. The Brønsted acid sites, probed with pyridine molecules for samples heat-treated at various temperatures, were chemically stable up to 473 K. Segregation of SnO(2) crystalline phase was observed at 1473 K but no crystalline phase was verified for SiO(2) at this temperature. The porous SiO(2)/SnO(2) matrix was used as base for Cu(II) immobilization and an electrode was developed for application in electrochemical detection of vitamin C in tablets.
Subject: Ascorbic Acid
Electron Probe Microanalysis
Hot Temperature
Models, Chemical
Phase Transition
Silicon Dioxide
Time Factors
Tin Compounds
X-ray Diffraction
Citation: Journal Of Colloid And Interface Science. v. 274, n. 2, p. 579-86, 2004-Jun.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2004.01.040
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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