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Novel Ni−Fe-oxide systems for catalytic oxidation of cyanide in an aqueous phase

Central European Journal of Chemistry volume 3, pages 295–310 (2005)Cite this article

Abstract

Catalytic activity of mixed Ni−Fe oxide systems with respect to air oxidation of aqueous cyanide solution at 308 K was investigated. The catalysts employed were prepared by an oxidation-precipitation method at room temperature and were characterized by powder X-ray diffraction (XRD), Mössbauer spectroscopy, and chemical analysis. The cyanide oxidation rate was found to be dependent on the catalyst's calcination temperature, pH of the medium, and catalyst loading. Results revealed that the catalyst calcined at 120°C is the most active where up to 90% of free cyanide (4 mM) was removed after oxidation for 30 minutes in the presence of 2.5 g/L catalyst at pH 9.5. The cyanide conversion becomes less favorable as the pH of the solution increases (with other constant parameters). The selectivity data showed that carbon dioxide is the main oxidation product, regardless of pH of the solution.

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Authors and Affiliations

  1. Department of Physical Chemistry, Paisii Hilendarski University of Poovdiv, 24 Tzar Assen Street, 4000, Plovdiv, Bulgaria

    Maria K. Stoyanova & Stoyanka G. Christoskova

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  1. Maria K. Stoyanova
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  2. Stoyanka G. Christoskova
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Stoyanova, M.K., Christoskova, S.G. Novel Ni−Fe-oxide systems for catalytic oxidation of cyanide in an aqueous phase. cent.eur.j.chem. 3, 295–310 (2005). https://doi.org/10.2478/BF02475998

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  • DOI: https://doi.org/10.2478/BF02475998

Keywords

  • Cyanide oxidation
  • iron-modified nickel oxide system
  • catalyst
  • kinetics study