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Chiriţă P, Descostes M, Schlegel ML. Oxidation of FeS by oxygen-bearing acidic solutions. J Colloid Interface Sci. 2008;321(1):84-95doi: 10.1016/j.jcis.2008.01.024.
Chiriţă, P., Descostes, M., & Schlegel, M. L. (2008). Oxidation of FeS by oxygen-bearing acidic solutions. Journal of colloid and interface science, 321(1), 84-95. https://doi.org/10.1016/j.jcis.2008.01.024
Chiriţă, Paul, et al. "Oxidation of FeS by oxygen-bearing acidic solutions." Journal of colloid and interface science vol. 321,1 (2008): 84-95. doi: https://doi.org/10.1016/j.jcis.2008.01.024
Chiriţă P, Descostes M, Schlegel ML. Oxidation of FeS by oxygen-bearing acidic solutions. J Colloid Interface Sci. 2008 May 01;321(1):84-95. doi: 10.1016/j.jcis.2008.01.024. Epub 2008 Mar 03. PMID: 18313687.
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J Colloid Interface Sci. 2008 May 01;321(1):84-95. doi: 10.1016/j.jcis.2008.01.024. Epub 2008 Mar 03.

Oxidation of FeS by oxygen-bearing acidic solutions.

Journal of colloid and interface science

Paul Chiriţă, Michaël Descostes, Michel L Schlegel

Affiliations

  1. Department of Inorganic, Analytical, and Technological Chemistry, University of Craiova, Calea Bucure?ti 107I, Craiova 200478, Romania.

PMID: 18313687 DOI: 10.1016/j.jcis.2008.01.024

Abstract

Oxidation of FeS in oxygen-bearing acidic solutions was investigated at different temperatures (25 to 45 degrees C) and pH (2.75 to 3.45). The rate of the oxidative dissolution of FeS is strongly dependent on pH. The reaction order with respect to hydrogen ions has been found to be 1.03+/-0.02 at 25 degrees C, and the apparent activation energy (E(a)) is 41.6 +/- 10.7 kJ mol(-1) at initial pH 3.00, suggesting that the FeS oxidative dissolution is controlled by the diffusion of oxidant species across a sulfur-rich layer (SRL) that undergoes chemical transformations leading to an increase in the mean number of sulfur atoms in polysulfide chains and the rearrangement of these chains. Fourier transform infrared spectroscopy and X-ray diffraction results obtained for the FeS samples reacted for 72 h at 25 degrees C and pH between 2.75 and 3.45 indicate the formation of goethite, of lepidocrocite, and of poorly ordered solid phases (assigned as SRL) on initial surfaces. The experimental data suggest a mechanism based on the protonation of FeS surfaces followed by oxidation of FeS by dissolved oxygen to produce Fe(2+), S(0), and S(2-)(n). Fe(2+) is unstable under oxidative conditions and transforms into Fe(OH)(3(s)), goethite and lepidocrocite.

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