Kinetic Study of the Electrochemical Mineralization of m-Cresol on a Boron-Doped Diamond Anode

Author(s): Cristina Flox, Enric Brillas, Andre Savall, Karine Groenen-Serrano.

Journal Name: Current Organic Chemistry

Volume 16 , Issue 17 , 2012

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Abstract:

The kinetics of the electrooxidation of m-cresol in aqueous solution was investigated in a one-compartment flow electrochemical cell with a boron-doped diamond electrode (BDD). Cyclic voltammograms recorded on BDD revealed that cresol oxidation takes place at a potential very close to the discharge of water. Under potentiostatic conditions, at a working potential lower than water discharge, a passive layer was rapidly formed on the electrode surface due to cresol polymerization. The anode fouling was not observed during electrolysis performed with the flow electrochemical cell operating under galvanostatic conditions. In this case, the decay of mcresol concentration followed a pseudo-first-order kinetics. The abatement of chemical oxygen demand (COD) showed that the kinetics of m-cresol oxidation was limited by mass transfer and that a full mineralization was achieved. A good agreement between predicted and experimental COD and instantaneous current efficiency values was obtained, although some deviations were observed at high current since the experimental data decreased faster than those predicted ones. These deviations can be explained by the occurrence of oxygen evolution which increases the mass transfer coefficient.

Keywords: Electrooxidation, Boron-doped diamond, Cresol, Wastewater treatment, mineralization, polymerization, voltammograms, Aromatic compounds, kinetics, oxalic

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Article Details

VOLUME: 16
ISSUE: 17
Year: 2012
Page: [1960 - 1966]
Pages: 7
DOI: 10.2174/138527212803251712
Price: $58

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