Surface oxidation of chalcocite (Cu2S) under aqueous (pH=2-11) and ambient atmospheric conditions: Mineralogy from Cu L- and OK-edge X-ray absorption spectroscopy

EC Todd*, DM Sherman

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)

Abstract

We characterized the surface oxidation layer (similar to50 Angstrom) of chalcocite reacted with air-saturated aqueous solutions at pH=2-11 and with the ambient atmosphere. Copper L-edge and O K-edge X-ray absorption spectroscopy probes the unoccupied electronic states in the conduction band of the surface alteration phase that, in turn, enables us to identify the mineralogy of the surface layer. At low pH, the surface alteration phase is primarily cuprite (Cu2O). At higher pH, tenorite (CuO) is the dominant phase. No evidence for sulfate or carbonate phases are present; however, chalcocite reacted only in air does develop a CuSO4 surface phase in addition to cuprite and minor tenorite.

Original languageEnglish
Pages (from-to)1652-1656
Number of pages5
JournalAmerican Mineralogist
Volume88
Issue number11-12
Publication statusPublished - 2003

Keywords

  • ELECTRONIC-STRUCTURE
  • COPPER
  • FLOTATION
  • SULFIDES
  • STATES
  • DEPTH

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