FT-IR studies of ethyl xanthate adsorption on gold, silver and gold—silver alloys

Jaakko Leppinen, R.-H. Yoon, J. Mielczarski

Research output: Contribution to journalArticleScientificpeer-review

32 Citations (Scopus)

Abstract

The effect of electrochemical potential on the adsorption of potassium ethyl xanthate (KEX) on gold, silver and their alloys of different compositions has been studied in borate solutions of pH 9.2, using FT-IR reflection spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). The results show that (EX)2 and AgEX are the oxidation products formed on pure gold and silver, respectively. Both voltammetry and IR reaction spectroscopy show that the onset of these oxidation reactions occurs near the reversible potentials for the EX/(EX)2 and EX/AgEX couples. On gold-silver alloys, AgEX is formed first during the anodic scan, followed by (EX)2 formation. The potential at which xanthate is oxidized is reduced significantly, depending on the amount of silver present in a gold—silver alloy. Thus, the presence of silver in gold allows the xanthate flotation to be achieved at lower potentials than with pure gold. Both the IR and XPS spectra show evidence for the formation of unknown surface species at low potentials.

Original languageEnglish
Pages (from-to)189 - 203
Number of pages15
JournalColloids and Surfaces
Volume61
DOIs
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

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Silver
Gold
Silver alloys
Adsorption
X ray photoelectron spectroscopy
Spectroscopy
Gold alloys
Oxidation
Voltammetry
Flotation
Cyclic voltammetry
Potassium
Chemical analysis

Cite this

Leppinen, Jaakko ; Yoon, R.-H. ; Mielczarski, J. / FT-IR studies of ethyl xanthate adsorption on gold, silver and gold—silver alloys. In: Colloids and Surfaces. 1991 ; Vol. 61. pp. 189 - 203.
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abstract = "The effect of electrochemical potential on the adsorption of potassium ethyl xanthate (KEX) on gold, silver and their alloys of different compositions has been studied in borate solutions of pH 9.2, using FT-IR reflection spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). The results show that (EX)2 and AgEX are the oxidation products formed on pure gold and silver, respectively. Both voltammetry and IR reaction spectroscopy show that the onset of these oxidation reactions occurs near the reversible potentials for the EX−/(EX)2 and EX−/AgEX couples. On gold-silver alloys, AgEX is formed first during the anodic scan, followed by (EX)2 formation. The potential at which xanthate is oxidized is reduced significantly, depending on the amount of silver present in a gold—silver alloy. Thus, the presence of silver in gold allows the xanthate flotation to be achieved at lower potentials than with pure gold. Both the IR and XPS spectra show evidence for the formation of unknown surface species at low potentials.",
author = "Jaakko Leppinen and R.-H. Yoon and J. Mielczarski",
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FT-IR studies of ethyl xanthate adsorption on gold, silver and gold—silver alloys. / Leppinen, Jaakko; Yoon, R.-H.; Mielczarski, J.

In: Colloids and Surfaces, Vol. 61, 1991, p. 189 - 203.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - FT-IR studies of ethyl xanthate adsorption on gold, silver and gold—silver alloys

AU - Leppinen, Jaakko

AU - Yoon, R.-H.

AU - Mielczarski, J.

N1 - Project code: MIN1503

PY - 1991

Y1 - 1991

N2 - The effect of electrochemical potential on the adsorption of potassium ethyl xanthate (KEX) on gold, silver and their alloys of different compositions has been studied in borate solutions of pH 9.2, using FT-IR reflection spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). The results show that (EX)2 and AgEX are the oxidation products formed on pure gold and silver, respectively. Both voltammetry and IR reaction spectroscopy show that the onset of these oxidation reactions occurs near the reversible potentials for the EX−/(EX)2 and EX−/AgEX couples. On gold-silver alloys, AgEX is formed first during the anodic scan, followed by (EX)2 formation. The potential at which xanthate is oxidized is reduced significantly, depending on the amount of silver present in a gold—silver alloy. Thus, the presence of silver in gold allows the xanthate flotation to be achieved at lower potentials than with pure gold. Both the IR and XPS spectra show evidence for the formation of unknown surface species at low potentials.

AB - The effect of electrochemical potential on the adsorption of potassium ethyl xanthate (KEX) on gold, silver and their alloys of different compositions has been studied in borate solutions of pH 9.2, using FT-IR reflection spectroscopy, cyclic voltammetry and X-ray photoelectron spectroscopy (XPS). The results show that (EX)2 and AgEX are the oxidation products formed on pure gold and silver, respectively. Both voltammetry and IR reaction spectroscopy show that the onset of these oxidation reactions occurs near the reversible potentials for the EX−/(EX)2 and EX−/AgEX couples. On gold-silver alloys, AgEX is formed first during the anodic scan, followed by (EX)2 formation. The potential at which xanthate is oxidized is reduced significantly, depending on the amount of silver present in a gold—silver alloy. Thus, the presence of silver in gold allows the xanthate flotation to be achieved at lower potentials than with pure gold. Both the IR and XPS spectra show evidence for the formation of unknown surface species at low potentials.

U2 - 10.1016/0166-6622(91)80309-C

DO - 10.1016/0166-6622(91)80309-C

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JO - Colloids and Surfaces

JF - Colloids and Surfaces

SN - 0166-6622

ER -