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Electrochemical and surface analytical studies of enargite in acid solution.

Asbjoernsson, J.; Kelsall, G. H.; Pattrick, R. A. D.; Vaughan, D. J.; Wincott, P. L.; Hope, G. A

Journal of the Electrochemical Society. 2004;151:E250-E256.

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Abstract

The electrochem. oxidn. and redn. of the surface of natural enargite (Cu3AsS4) was studied in 0.1M HCl soln. using cyclic voltammetry and chronoamperometry. Surface anal. by ex situ XPS and in situ Raman spectroscopy, together with aq. phase anal. by inductively coupled plasma-at. emission spectrometry (ICP-AES), were used to aid in the interpretation of the electrochem. behavior of this complex system. XPS analyses on enargite oxidized at potentials >0.2 V (SCE) detected the presence of CuII surface species, with assocd. sulfate and chloride. At potentials <0.6 V (SCE), oxidn. of As was detected with possible minor amts. of AsV at higher potentials. Anal. of the electrolyte in contact with enargite showed that the amt. of dissolved S increased under reducing potentials due to H2S formation and at oxidizing potentials due to the formation of sulfoxy species. The amt. of dissolved Cu increased at potentials >0.2 V (SCE), whereas dissolved As concns. were negligible over the entire potential range studied. Raman spectroscopy provided addnl. evidence of elemental S formation at oxidizing potentials at which sulfate forming reactions occurred in parallel. The S was responsible for an active-passive transition obsd. at .apprx.0.3 V (SCE) in voltammograms. [on SciFinder (R)]

Keyword(s)

Binding energy Raman spectra X-ray photoelectron spectra (of enargite and effect of electrolytic polarization in HCl soln.) Cyclic voltammetry (of enargite electrode in hydrochloric acid solns.) Oxidation Reduction (of enargite in hydrochloric acid solns.)

Bibliographic metadata

Type of resource:
Content type:
Published date:
ISSN:
Volume:
151
Start page:
E250
End page:
E256
Pagination:
E250-E256
Digital Object Identifier:
10.1149/1.1756892
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:1a3448
Created:
6th August, 2009, 10:08:36
Last modified:
1st February, 2013, 08:56:59

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