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Electrochemical redox of Cd(II) mediated by activated carbon modified glassy carbon electrode.


Citation

Tan, Wee Tee and Radhi, M. M. and Ab. Rahman, Mohamad Zaki and Kassim, Anuar (2010) Electrochemical redox of Cd(II) mediated by activated carbon modified glassy carbon electrode. Oriental Journal of Chemistry, 26 (2). pp. 339-347. ISSN 0970-020X; ESSN: 2231-5039

Abstract

The use of a glassy carbon electrode (GCE) modified by activated carbon (AC) mediates the redox of (CdCl2) in 0.1 M aqueous solution of potassium chloride (KCl) supporting electrolyte. During cyclic voltammetry, two oxidation and two reduction current peaks of Cd2+ were appearing at +0.4, -0.6, +0.6 and -1.8V respectively, versus Ag/AgCl. The redox current of Cd2+ was enhanced by two folds at AC modified GCE and about five folds in acidic media. The oxidation peak of Cd2+ was shifted to lower potential by approximately 5mV and for the reduction peak was shifted to 0 mV when AC modified GCE in acidic pH. The sensitivity under condition of cyclic voltammetry was significantly dependent on pH, concentration of AA and temperature. Interference with Cd2+ was observed in different metal ions, such as Cu2+ Mn2+ and Hg2+. The current enhancement appeared and causes further increase in the two reduction peaks and one of oxidation peak of Cd2+, in contrast the other oxidation current peak decrease when increase the concentration of the interference metals. The surface charge determined by chronocoulometry (CC) of Cd2+ at AC/GCE in presence of AA solution was more conductive than use of GCE. Diffusion coefficient determined by chronoamperometry (CA) for Cd2+ at AC/GCE in presence of AA was promising results.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Oriental Scientific Publishing
Keywords: Activated carbon; GC electrode; CdCl2; Ascorbic acid; Cyclic voltammetry.
Depositing User: Najwani Amir Sariffudin
Date Deposited: 02 May 2014 03:08
Last Modified: 15 Jan 2016 08:39
URI: http://psasir.upm.edu.my/id/eprint/14464
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