Patterned copper sulfide thin films: a method for studying leaching behaviour

Brokenshire, Rachel S., Somers, Anthony, Chen, Miao and Torriero, Angel A.J. 2017, Patterned copper sulfide thin films: a method for studying leaching behaviour, Australian journal of chemistry, vol. 70, no. 1, pp. 26-32, doi: 10.1071/CH16088.

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Title Patterned copper sulfide thin films: a method for studying leaching behaviour
Author(s) Brokenshire, Rachel S.
Somers, AnthonyORCID iD for Somers, Anthony
Chen, Miao
Torriero, Angel A.J.ORCID iD for Torriero, Angel A.J.
Journal name Australian journal of chemistry
Volume number 70
Issue number 1
Start page 26
End page 32
Total pages 7
Publisher CSIRO
Place of publication Melbourne, Vic.
Publication date 2017
ISSN 0004-9425
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Summary © CSIRO 2017.An experimental study on copper leaching from Cu1.85S thin films is presented, wherein copper extraction is quantitatively evaluated by changes in film thickness measured by white light interferometric profilometry. Changes in the film morphology and elemental composition, as assessed by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, are used to confirm that the loss in film thickness is due to changes in the copper content and that the resultant film species is consistent with the mechanism of copper dissolution. The Cu1.85S thin films were synthesized by chemical bath deposition. The leaching behaviour of copper from the films was investigated in acidic ferric sulfate media at pHs 1, 2, and 3, and pH 1 at redox potentials of ∼350-650mV versus Ag/AgCl in 3M KCl. The changes in the film thickness and copper sulfur ratio were shown to reflect copper dissolution behaviour from chalcocite. Leaching of the Cu1.85S films demonstrated a greater decrease in film thickness as pH decreased. In addition comparison of the order of reaction as a function of proton concentration in non-oxidative dissolution of Cu1.85S (0.06) and as a function of iron(iii) concentration in ferric oxidation of Cu1.85S (0.40) shows that the proton dissolution reaction is negligible. Leaching of the Cu1.85S films at redox potentials of up to ∼476.4mV versus Ag/AgCl in 3M KCl produced covellite and demonstrated greater decreases in film thickness with increases in the redox potential. Leaching of the films above ∼476.4mV resulted in the formation of spionkopite and demonstrated a much lesser decrease in film thickness. These results are consistent with Eh-pH diagrams for the Cu-S-H2O system.
Language eng
DOI 10.1071/CH16088
Field of Research 030604 Electrochemistry
030299 Inorganic Chemistry not elsewhere classified
Socio Economic Objective 840202 Mining and Extraction of Copper Ores
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, CSIRO
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