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Interactions between Sulfide Minerals and Alkylxanthate Ions .1. A Vibrational Spectroscopic Study of the Interactions between Sphalerite and Synthetic Zinc(Ii) and Cadmium(Ii) Sulfides, and Ethylxanthate Ions in Aqueous and Acetone Solutions

Author:
  • Per Persson
  • B. Malmensten
  • I. Persson
Publishing year: 1991
Language: English
Pages: 2769-2777
Publication/Series: Journal of the Chemical Society, Faraday Transactions
Volume: 87
Document type: Journal article
Publisher: Royal Society of Chemistry
Additional info: 17

Abstract english

The crystal structures of zinc(II) and cadmium(II) sulphides are not affected by the stoichiometry of metal and sulphide ions at the precipitation of the two compounds. The composition and structure of the ultimate surface layers, and thereby the chemical properties of the particles, are on the other hand sensitive to the stoichiometry at the preparation. Chemisorbed ethylxanthate complexes are formed at metal ion sites on the surfaces of sphalerite and synthetic zinc(II) and cadmium(II) sulphides at metal and ethylxanthate ion concentrations where the solubility product of zinc(II) or cadmium(II) ethylxanthate is not exceeded. Two different types of ethylxanthate species co-ordinated to the surfaces have been found. These have been assigned to mono- and bi-dentate co-ordination of the ethylxanthate ion to the surface. Surface complexes are most probably enthalpy stabilized, and the bond(s) between the metal ion site in the surface and the ligand must contain some degree of covalency, as the entropy contribution to the formation of a chemisorbed complex on a surface is small. The stability of complexes of this kind is expected to increase with increasing softness of metal site and ligand. This is indicated as the ethylxanthate and EDTA surface complexes on cadmium(II) sulphide seem to be more stable than the corresponding complexes on zinc(II) sulphide surfaces. The stability of the surface complex is dependent on the solvent used, and seems to be a function of the solvation properties of the solvent.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 0956-5000
Per Persson
E-mail: per [dot] persson [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 17 96

+46 70 266 38 79

E-C350

50

Professor

Centre for Environmental and Climate Research (CEC)

+46 46 222 17 96

+46 70 266 38 79

D350

Ekologihuset, Sölvegatan 37, Lund

50