Conroy, Kenneth G. and Breslin, Carmel B. (2004) Reduction of hexavalent chromium at a polypyrrole-coated aluminium electrode: Synergistic interactions. Journal of Applied Electrochemistry, 34 (2). pp. 191-195. ISSN 0021-891X

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Abstract

Adherent polypyrrole films were electropolymerized from a tosylic acid solution onto an aluminium substrate and used for the reduction of Cr(VI). The reduction of Cr(VI) to the trivalent state was found to proceed by pseudo-first-order kinetics with an activation energy barrier of 15.13 kJ mol−1. This catalyst could be regenerated by reducing the composite at a sufficiently negative potential, in the absence of Cr(VI). However, it was found that the catalyst functioned also through a self-sustained regeneration mechanism. In this mechanism, Cr(VI) was reduced by PPy0 to generate PPy+, but the PPy+ was subsequently reduced to PPy0 by oxidation of the aluminium substrate, thus regeneration of the catalytic PPy0 surface giving rise to a synergistic action between the polypyrrole and the aluminium substrate.

Item Type:	Article
Additional Information:	ite this article as: Conroy, K.G. & Breslin, C.B. Journal of Applied Electrochemistry (2004) 34: 191. doi:10.1023/B:JACH.0000009924.52188.f6
Keywords:	aluminium; electropolymerization; hexavalent chromium; kinetics; pollution control; polypyrrole;
Academic Unit:	Faculty of Science and Engineering > Chemistry
Item ID:	7933
Identification Number:	https://doi.org/10.1023/B:JACH.0000009924.52188.f6
Depositing User:	Dr. Carmel Breslin
Date Deposited:	15 Feb 2017 16:36
Journal or Publication Title:	Journal of Applied Electrochemistry
Publisher:	Springer Verlag
Refereed:	Yes
Funders:	Enterprise Ireland (EI)
URI:	http://link.springer.com
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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