Abstract
The adsorption of flotation collectors such as 2-mercapto-benzothiazole (MBT) or potassium ethyl xanthate (EX), on platinum was electrochemically studied by the cyclicvoltammetry technique. The current-potential curve presents a definite peak of the oxidation of MBT ion or EX ion due to one electron release. The charge transfer step is more slowly in the adsorption of MBT ion than EX ion on platinum. The anodic oxidation of MBT ion com-mences at potentials greater than by the oxidation of EX ion on platinum. A hydrophobic layer of adsorbate was formed on the platinum electrode surface by the electrochemical processes, an anodic oxidation of the collectors, and that of absorbate was hardly reduced back to collector ions, not giving rise to the cathodic current peak.
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