- Title
- Electrocatalysis of asulam on cobalt phthalocyanine modified multi-walled carbon nanotubes immobilized on a basal plane pyrolytic graphite electrode
- Creator
- Siswana, Msimelelo P, Ozoemena, Kenneth I, Nyokong, Tebello
- Date
- 2006
- Type
- Article
- Identifier
- vital:6595
- Identifier
- http://hdl.handle.net/10962/d1004344
- Description
- 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.
- Format
- 17 pages, pdf
- Language
- English
- Relation
- 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. Available: http://dx.doi.org/10.1016/j.electacta.2006.03.090
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Nyokong, Tebello (Distinguished Professor)
RU Department of Chemistry
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