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On the crucial influence of some supporting electrolytes during electrocoagulation in the presence of aluminum electrodes

Trompette, Jean-Luc and Vergnes, Hugues On the crucial influence of some supporting electrolytes during electrocoagulation in the presence of aluminum electrodes. (2009) Journal of Hazardous Materials, vol. 163 (n° 2-3). pp. 1282-1288. ISSN 0304-3894

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Official URL: http://dx.doi.org/10.1016/J.JHAZMAT.2008.07.148

Abstract

The influence of some supporting electrolytes on aluminum electrode oxidation and pH variation during electrocoagulation of an unskimmed milk sample and a cutting oil emulsion has been investigated. Among the electrolytes studied, sulfate anions were found to be quite harmful both for electrical consumption and electrocoagulation efficiency. At the opposite, chloride and ammonium ionswere particularly benefic respectively for aluminum corrosion and pH regulation, whereas sodium cations were observed to have a neutral role. The results indicate that electrocoagulation can be realized at lowanodic potential even in the presence of sulfate ions when the [Cl−]/[SO4 2−] ratio is around or greater than 1/10. The detrimental effect of sulfates on electrocoagulation efficiency can be thwarted by the use of the ammonium salt thanks to its related buffer effect.

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/S0304389408011448
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
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
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Deposited By:Audrey LEFEVRE

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