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

Abusafa A., Yucel H.

SEPARATION AND PURIFICATION TECHNOLOGY, vol.28, no.2, pp.103-116, 2002 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 2
  • Publication Date: 2002
  • Doi Number: 10.1016/s1383-5866(02)00042-4
  • Journal Name: SEPARATION AND PURIFICATION TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.103-116
  • Keywords: clinoptilolite, cesium, sorption isotherm, Dubinin-Radushkevich isotherm, ADSORPTION-ISOTHERMS, SIEVE PROPERTIES, ION-EXCHANGE, MORDENITE, SORPTION, CESIUM, REFINEMENT, HEULANDITE, CHABAZITE, SOILS
  • Middle East Technical University Affiliated: No

Abstract

Distribution coefficients of cesium on natural and cation-enriched (Na(+), K(+), NH(4)(+) 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/dm(3) and at temperatures of 25, 40, 60 and 80 degreesC. 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. (C) 2002 Elsevier Science B.V. All rights reserved.