Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 774, Issue -, Pages 66-75Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.04.035
Keywords
Pyrite; Fe(III)/Fe(II) oxidation-reduction reaction; Chronoamperometry; Kinetics; Tafel curves
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Barrick Gold Corp through the Collaborative Research and Development Grant [CRDPJ 469802-14]
- Foreign Affairs, Trade and Development Canada
- Canadian Bureau for International Education (CBIE)
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In this paper, the electrochemical behavior of Fe(III) and Fe(II) couple on the pyrite surface was studied by application of the chronoamperometly technique in acidic solutions at room temperature and atmospheric pressure. The effect of the pyrite origin and the Fe(III) and Fe(II) ion concentration on the electron transfer kinetics of the Fe(III)/Fe(II) reaction was probed. Tafel behavior of the Fe(III)/Fe(II) couple redox reaction-under the test conditions was developed. The Fe(III)/Fe(II) reaction on the pyrite electrodes with different origins demonstrated a common mechanism, despite different kinetics. The exchange current densities of the redox reaction had the same magnitude of 10(-5) A cm(-2) for all samples. The value of cathodic transfer coefficients ranged between 0.4 and 0.5, while the lowest magnitude of anodic transfer coefficients was 0.23. It was shown that an increase of an order of magnitude of iron concentration did not have a significant effect on the Fe(III)/Fe(II) couple redox reaction exchange current density nor on the value of cathodic transfer coefficients of the reaction. (C) 2016 Elsevier B.V. All rights reserved.
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