Dubinin-Radushkevich isotherm

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Removal of 137Cs from aqueous solutions using different cationic forms of a natural zeolite: clinoptilolite

Journal Title, Volume, Page: 
Separation and Purification Technology 28 (2002) 103–116
Year of Publication: 
2002
Authors: 
Abdelrahim Abusafa
Chemical Engineering Department, Middle East Technical University, Ankara 06531, Turkey
Current Affiliation: 
Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine
Hayrettin Yücel
Chemical Engineering Department, Middle East Technical University, Ankara 06531, Turkey
Preferred Abstract (Original): 

Distribution coefficients of cesium on natural and cation-enriched (Na+, K+, NH4+ and Ca+2) forms of clinoptilolite were measured by batch, radioactive tracer technique. The measurements were carried out for an initial cesium concentration range of 10−6–10−1 mol/dm3 and at temperatures of 25, 40, 60 and 80 °C. Experimental isotherms evaluated from distribution coefficients were fit to Langmuir, Freundlich and Dubinin-Radushkevich (D-R)models. Of the models tested, D-R model was found to represent the isotherms better in a wider range of concentrations than either Langmuir or Freundlich model. Breakthrough behavior of cesium on natural and cation-enriched forms of clinoptilolite for a particular set of conditions were also determined in a small size column. Column parameters were evaluated using mass transfer zone concept.

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