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Electrolytic oxidation of trichloroethylene using a ceramic anode

Trichloroethylene (TCE) was transformed to CO sub(2), CO, Cl super(-) and ClO super(-) sub(3) at the anode of a two-chambered electrolytic cell. The working electrode was constructed from Ebonex registered , an electrically conductive ceramic (Ti sub(4)O sub(7)). Under our experimental conditions (a...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1999-08, Vol.29 (8), p.961-970
Main Authors: CHEN, G, BETTERTON, E. A, ARNOLD, R. G
Format: Article
Language:English
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Summary:Trichloroethylene (TCE) was transformed to CO sub(2), CO, Cl super(-) and ClO super(-) sub(3) at the anode of a two-chambered electrolytic cell. The working electrode was constructed from Ebonex registered , an electrically conductive ceramic (Ti sub(4)O sub(7)). Under our experimental conditions (anode potential E sub(a) = 2.5 to 4.3 V vs SSCE), the disappearance of TCE was first order in TCE concentration. The transformation rate was independent of pH in the range 1.6 < pH < 11. TCE oxidation occurred only on the anodic surface and was limited by mass transport at high potentials (E sub(a) > 4.0 V). The maximum (transport-limited), surface-area-normalized rate constant was about 0.002 43 cm s super(-1). Carbon-containing products included CO sub(2) primarily with traces of CO. At neutral and alkaline pHs, the only chlorine-containing products were Cl super(-1) and ClO super(-) sub(3). Hydroxyl radicals were detected in the anodic compartment using a spin trap (4-POBN). A kinetic model was successfully correlated with experimental results.
ISSN:0021-891X
1572-8838
DOI:10.1023/A:1003541706456