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Extension of Dubinin’s Theory to Adsorption from Aqueous Solutions

  • Fritz Stoeckli
  • Dash M. Nevskaia
  • Eva Castillejos-Lopez
  • Teresa A. Centeno
Conference paper
  • 1.5k Downloads
Part of the NATO Science for Peace and Security Series C: Environmental Security book series (NAPSC)

Adsorption of sparingly soluble organics from aqueous solutions, by activated carbons, can be described within the framework of Dubinin’s theory by using a modified Dubinin-Radushkevich-Kaganer (DRK) equation, where relative pressures are replaced by relative concentrations. With respect to the descriptions based on the Langmuir model and similar expressions, this approach has the advantage that it allows predictions on the basis of simple physico-chemical properties of the solid and of the adsorbate. Preliminary experiments indicate that in the case of dilute binary mixtures, the model of independent coadsorption, based on the DRK equation, applies. However, more experimental evidence is needed to confirm this potentially very useful approach in filtration technology.

Keywords: Dubinin’s theory; adsorption; aqueous solutions; binary mixtures

Keywords

Activate Carbon Graphitized Carbon Black Microporous Carbon Temperature Invariance Surface Affinity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V 2008

Authors and Affiliations

  • Fritz Stoeckli
    • 1
  • Dash M. Nevskaia
    • 2
  • Eva Castillejos-Lopez
    • 2
  • Teresa A. Centeno
    • 3
  1. 1.IMT-Chimie des SurfacesUniversity of NeuchâtelSwitzerland
  2. 2.Departamento de Quimica InorganicaFacultad de Ciencias UNEDSpain
  3. 3.Instituto Nacional del Carbón-CSICSpain

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