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    Reduction of hexavalent chromium at a polypyrrole-coated aluminium electrode: Synergistic interactions


    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:

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