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Electrochemical incineration of cresols: A comparative study between PbO2 and boron-doped diamond anodes

Flox, Cristina and Arias, Conchita and Billas, Enric and Savall, André and Groenen-Serrano, Karine Electrochemical incineration of cresols: A comparative study between PbO2 and boron-doped diamond anodes. (2009) Chemosphere, vol. 74 (n° 10). pp. 1340-1347. ISSN 0045-6535

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Official URL: http://dx.doi.org/10.1016/J.CHEMOSPHERE.2008.11.050

Abstract

The electrooxidation of aqueous solutions containing 5 mM of o-, m- and p-cresol at pH 4.0 has been investigated using a flow filter-press reactor with a boron-doped diamond (BDD) under galvanostatic electrolysis. All cresols are degraded at similar rate up to attaining overall mineralization. Comparable treatment of the m-cresol effluent on PbO2 leads to partial electrochemical incineration. However, this pollutant is more rapidly removed with PbO2 than with BDD. The decay kinetics of all cresols follows a pseudo-first-order reaction. Aromatic intermediates such as 2-methylhydroquinone and 2-methyl-p-benzoquinone and carboxylic acids such as maleic, fumaric, pyruvic, malonic, tartronic, glycolic, glyoxylic, acetic, oxalic and formic, have been identified and followed during the m-cresol treatment by chromatographic techniques. From these oxidation by-products, a plausible reaction sequence for m-cresol mineralization on both anodes is proposed. The energy consumption for the corresponding electrochemical process is also calculated.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at : http://www.sciencedirect.com/science/article/pii/S0045653508014690
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Universitat Autònoma de Barcelona - UAB (SPAIN)
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Deposited By: Audrey LEFEVRE
Deposited On:14 Jun 2012 13:36

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