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Radiometrie study of the adsorption of TcO -4 on hematite

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Abstract

The adsorption of TCO -4 on hematite powder is studied as a model system to demonstrate usefulness of the application of the so called radiotracer foil method for the investigation of sorption phenomena occurring at powdered oxides. It is shown that the character of the pH dependence of the adsorption and the role of the nature and concentration of supporting electrolyte in the sorption can be easily demonstrated and the problems connected with the reversibility of the processes can be easily solved. It is demonstrated that the addition of acids to the TCO -4 (H2O)/hematite system results in two opposite tendencies: an increase in the adsorption owing to the surface protonation and a decrease due to the adsorption competition of anions. The sign of the result depends on the absolute and relative concentration of the supporting electrolyte and the species added to the solution phase.

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Authors and Affiliations

  1. Hungarian Academy of Sciences, Chemical Research Center, Institute of Chemistry, PO Box 17, 1525, Budapest, Hungary

    G. Horányi & P. Joó

  2. Department of Colloid Chemistry, Kossuth Lajos University, PO Box 31, H-4010, Debrecen, Hungary

    G. Horányi & P. Joó

Authors
  1. G. Horányi
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  2. P. Joó
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Dedicated to the ninetieth anniversary of Ya.M. Kolotyrkin’s birth. Submitted in English.

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Horányi, G., Joó, P. Radiometrie study of the adsorption of TcO -4 on hematite. Russ J Electrochem 36, 1189–1194 (2000). https://doi.org/10.1007/BF02757693

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  • DOI: https://doi.org/10.1007/BF02757693

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