Electrocatalysis of asulam on cobalt phthalocyanine modified multi-walled carbon nanotubes immobilized on a basal plane pyrolytic graphite electrode

Siswana, M. and Ozoemena, K.I. and Nyokong, T. (2006) Electrocatalysis of asulam on cobalt phthalocyanine modified multi-walled carbon nanotubes immobilized on a basal plane pyrolytic graphite electrode. Electrochimica Acta, 52 (1). pp. 114-122. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2006.03.090

Abstract

This work describes the electrochemical properties of cobalt tetra-aminophthalocyanine (CoTAPc) complex electropolymerized at the surface of multi-walled carbon nanotube (MWCNT) abrasively immobilized onto a basal plane pyrolytic graphite electrode (BPPGE). The constructed electrode displayed excellent electrocatalytic behaviour towards the oxidation of the herbicide, asulam, as evidenced by the enhancement of the oxidation peak current (~6 times) and the shift in the oxidation potential to lower values (by ~120 mV) in comparison with the bare BPPGE. The chronoamperometric detection of asulam which was carried out in 0.10 M phosphate buffer (pH 7.0) at a fixed potential of 0.65 V (versus Ag|AgCl) yielded excellent analytical parameters; a linear concentration range of 4.5–20 μM, a sensitivity of 241 × 10[superscript −3] μA/μM, a detection limit of 1.15 μM asulam (using the Y[subscript B] + 3σ criterion) and a response time of ~2 s.

Item Type:Article
Uncontrolled Keywords:Cobalt tetra-aminophthalocyanine; Multi-walled carbon nanotube; Basal plane pyrolytic graphite electrode; Electropolymerization; Asulam; Electrocatalysis
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Chemistry
ID Code:644
Deposited By: Mrs Eileen Shepherd
Deposited On:05 Jun 2007
Last Modified:06 Jan 2012 16:18
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