Anodic oxidation of sulfide ions from chloride brines

The anodic oxidation of sulfide ions from chloride brines at graphite electrodes is shown to produce elemental sulfur, that was identified using XPS and EDS measurements. The process is controlled by charge transfer at the interface and diffusion of the sulfide ions in the electrolyte. Potentiostati...

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Bibliographic Details
Published in:Electrochemistry communications 2002-03, Vol.4 (3), p.231-238
Main Authors: Ateya, B.G, Al-Kharafi, F.M
Format: Article
Language:English
Subjects:
Anodic oxidation
Applied sciences
Drilling
Energy
Exact sciences and technology
Geothermal brine
Geothermal energy
Hydrogen sulfide
Natural energy
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Summary:The anodic oxidation of sulfide ions from chloride brines at graphite electrodes is shown to produce elemental sulfur, that was identified using XPS and EDS measurements. The process is controlled by charge transfer at the interface and diffusion of the sulfide ions in the electrolyte. Potentiostatic current transients reveal exponential decay of the current with time accompanied by gradual increase of the polarization resistance of the interface, at a rate which increases with increase of the potential in the noble direction. This behavior is attributed to passivation of the electrode by the elemental sulfur which deposits on its surface.
ISSN:1388-2481
1873-1902
DOI:10.1016/S1388-2481(02)00254-0