Clay Effect in the Electrochemical Stabilization of Colloidal CoO(OH) Applied as a Modified Electrode

In this work, a mixed material was prepared using a montmorillonite clay (denominated imported sodic, IS) modified with colloidal cobalt (Co). The obtained mixed material (ISCo) was characterized by X-ray diffractometry and simultaneous thermal analysis and used to modify the surface of a platinum e...

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Bibliographic Details
Published in:Orbital : The Electronic Journal of Chemistry 2016-10, Vol.8 (6), p.314-320
Main Authors: Roloff, Luceli, Barbosa, Elisangela Muncinelli Caldas, Mariani, Filipe Quadros, Galli, Andressa, Anaissi, Fauze Jaco
Format: Article
Language:English
Subjects:
Chemical properties
clays
Cobalt compounds
cobalt oxide-hydroxide
Electric properties
Electrochemical analysis
electrochemical techniques
Electrodes
Hydroxides
Methods
mixed materials
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Summary:In this work, a mixed material was prepared using a montmorillonite clay (denominated imported sodic, IS) modified with colloidal cobalt (Co). The obtained mixed material (ISCo) was characterized by X-ray diffractometry and simultaneous thermal analysis and used to modify the surface of a platinum electrode for electrochemical determination of oxalic acid. The electrochemical behavior of the ISCo material was evaluated by cyclic voltammetry and the performance as a sensor for oxalic acid was assessed by square wave voltammetry. The platinum electrode showed no response to peak current when the oxalic acid concentration was increased in the range of 4.99 x [10.sup.-4] to 4.95 x [10.sup.-3] mol [L.sup.-1]. On the other hand, the platinum electrode modified with the mixed material presented a linear response in the studied range with a detection limit of 2.55 x [10.sup.-4] mol [L.sup.-1]. Keywords: clays; cobalt oxide-hydroxide; electrochemical techniques; mixed materials
ISSN:1984-6428
1984-6428
DOI:10.17807/orbital.v0i0.876