Specific adsorption of anions preceding the dissolution of CuO in acidic solution

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Abstract

The specific adsorption of sulfate and chloride ions on powdered CuO was studied by radiotracer techniques in acidified of 0.5 mol dm-3 NaClO4 supporting electrolyte. It was found that the pH and concentration dependence of the adsorption of labelled sulfates could be determined over a wide pH range (2.0 ≤ pH ≤ 7.0), despite the gradual dissolution of the copper oxide. No specific adsorption was found at pH≥7.0. It was postulated that the specific adsorption was preceded by the protonation of the CuO surface. No reliable relationships were found for labelled chlorides, owing to the relatively high desorption rate of the surface complexes formed in the sorption process. The apparent adsorbability of sulfate ions was significantly higher than that of the chloride ions, as shown by the results of competitive adsorption of the two species. This observation was in agreement with the postulated lower desorption rate of the surface complex formed with sulfates than that of species formed with chlorides.

Original languageEnglish
Pages (from-to)463-467
Number of pages5
JournalJournal of Solid State Electrochemistry
Volume6
Issue number7
DOIs
Publication statusPublished - Sep 1 2002

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Keywords

  • Adsorption
  • Chloride ions
  • Copper oxide
  • Radiotracer technique
  • Sulfate ions

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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