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Effects of some ion-specific properties in the electrocoagulation process with aluminum electrodes

Trompette, Jean-Luc and Lahitte, Jean-François Effects of some ion-specific properties in the electrocoagulation process with aluminum electrodes. (2021) Colloids and Surfaces A: Physicochemical and Engineering Aspects, 629. 127507. ISSN 0927-7757

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Official URL: https://doi.org/10.1016/j.colsurfa.2021.127507

Abstract

The influence of anion specificity on the faradaic efficiency relative to aluminum oxidation during electrocoagulation has been reported. While with chaotrope anions, the faradaic efficiency is higher than 1, it is lower than 1 with kosmotrope anions. The origin of this distinction has been ascribed to the ability of anions to cause pitting through the thin passive film at the aluminum surface, which depends on the varying resistance of the anions to dehydration. The influence of the nature of the cation of the supporting electrolyte on the efficiency of electrocoagulation has been investigated by comparing the same treatment of two characteristic colloidal samples. While removal efficiency is better for a positively charged latex in the presence of sodium chloride, it is better for a negatively charged oil in water emulsion in the presence of ammonium chloride. The results come from different effects of pH and its influence on aluminum species during electrocoagulation.

Item Type:Article
HAL Id:hal-03342993
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:16 Sep 2021 10:34

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