Observations of gold iodide adsorption on highly oriented pyrolytic graphite

D. W. Collins, J. B. Hiskey

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

The uptake of gold from halide solutions by activated carbon has been investigated using various techniques. Halide systems typically exhibit combined adsorption-reduction type behavior. In an attempt to gain more information about the nature of these processes, samples of synthetic highly-oriented pyrolytic graphite (HOPG) were contacted with aqueous solutions of gold-iodide. HOPG represents a model structure for activated carbon comprising of basal-plane sites, edge sites, and various defect sites. Two basic instrumental methods were used to examine the uptake of gold by HOPG. The first was standard X-ray photoelectron spectroscopy (XPs). The other involved several scanning probe techniques. XPS clearly indicated a preferred uptake of gold at edge sites. However, iodine appeared to be distributed on both basal-plane and edge sites. At low iodine additions, tapping mode AFM showed that clusters were concentrated along steps and surface defects. At high iodine concentrations, the HOPG surface was uniformly covered by iodine.

Original languageEnglish (US)
Pages985-998
Number of pages14
StatePublished - Jan 1 1998
EventProceedings of the 1998 TMS Annual Meeting - San Antonio, TX, USA
Duration: Feb 15 1998Feb 19 1998

Other

OtherProceedings of the 1998 TMS Annual Meeting
CitySan Antonio, TX, USA
Period2/15/982/19/98

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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