Uranium adsorption characteristic and thermodynamic behavior of clinoptilolite zeolite


Kilincarslan A., Akyil S.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol.264, no.3, pp.541-548, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 264 Issue: 3
  • Publication Date: 2005
  • Doi Number: 10.1007/s10967-005-0750-5
  • Title of Journal : JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Page Numbers: pp.541-548

Abstract

Natural zeolite, clinoptilolite was tested for its ability to remove uranium from aqueous solutions. Influence parameters to the sorption process, such as initial uranium concentration, pH, contact time and temperature were investigated. Distribution coefficients of uranium on clinoptilolite were measured by batch technique. Experimental isotherms evaluated from the distribution coefficients were fit to Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models. Values of Delta H and Delta S were found as 0.93 and 56.09 J/mole, respectively. It was observed that the adsorption process is endothermic. Kinetics of uranium sorption was investigated at different time intervals at 30 degrees C. The reaction rate and diffusion constant were calculated.