Mechanism of the cathodic process coupled to the oxidation of iron monosulfide by dissolved oxygen

Journal of Colloid and Interface Science
Mădălina I DuineaPaul Chiriţă

Abstract

This study investigated the mechanism of iron monosulfide (FeS) oxidation by dissolved oxygen (O2(aq)). Synthetic FeS was reacted with O2(aq) for 6days and at 25°C. We have characterized the initial and reacted FeS surface using Scanning Electron Microscopy coupled with Energy Dispersive X-ray (SEM/EDX) analysis, Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). It was found that during the aqueous oxidation of FeS new solid phases (disulfide, polysulfide, elemental sulfur, ferric oxyhydroxides and Fe3O4) develop on the mineral surface. The results of potentiodynamic polarization experiments show that after 2days of FeS electrode immersion in oxygen bearing solution (OBS) at initial pH 5.1 and 25°C the modulus of cathodic Tafel slopes dramatically decreases, from 393mV/dec to 86mV/dec. This decrease is ascribed to the change of the mechanism of electron transfer from cathodic sites to O2 (mechanism of cathodic process). The oxidation current densities (jox) indicate that mineral oxidative dissolution is not inhibited by pH increase up to 6.7. Another conclusion, which emerges from the analysis of jox, is that the dissolved Fe(3+) does not intermediate the aqueous oxidation of FeS. The results of electrochem...Continue Reading

References

Feb 20, 1970·Science·P C Singer, W Stumm
Mar 4, 2008·Journal of Colloid and Interface Science·Paul ChiriţăMichel L Schlegel
May 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Kenichi ShimizuJean-François Boily
Jul 15, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ray L FrostFernanda Maria Belotti

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