Ion Exchange Behavior of Zeolites A and P Synthesized Using Natural Clinoptilolite

Document Type: Research Article


Nuclear Science Research School, Nuclear Science and Technology Research Institute (NSTRI), P.O.B. 11365-3486, Tehran, I.R. IRAN


The main goal of this study is to investigate the capability of zeolites A and P synthesized from Iranian natural clinoptilolite for uranium uptak. The removal of uranium(VI) from aqueous solution via ion exchange by zeolites in a single component system with various contact times,  temperatures and initial concentrations of uranium(VI) was investigated. The experimental results were fitted to the Langmuir and Dubinin-Radushkevich isotherms to obtain the characteristic parameters of each model. Both the Langmuir and Dubinin-Radushkevich isotherms were found to good represent the measured adsorption data. Using the thermodynamic equilibrium constants obtained at two different temperatures, various thermodynamic parameters, such as ΔG˚, ΔH˚, and ΔS˚ have been calculated. The thermodynamics of uranium(VI) ion and zeolite system indicates the spontaneous and endothermic nature of the process. It was noted that an increase in temperature resulted in a higher uranium loading per unit weight of the adsorbent.


Main Subjects


[2] Lynne E. Macaskie and Alastair C. R. Dean, Use of Immobilized Biofilm of Citrobacter sp. for the Removal of Uranium and Lead from Aqueous Flows, Enzyme and Microbial Technology, 9(1), p. 2 (1987).

[3] Runping  Han,  Weihua  Zou,  Yi  Wang,  Lu  Zhu, Removal of Uranium(VI) from Aqueous Solutions by Manganese Oxide Coated Zeolite, Journal of Environmental Radioactivity, 93, p. 127 (2007).

[4] Krestou, A., Xenidis, A., Panias, D., Mechanism of Aqueous Uranium (VI) Uptake by Natural Zeolitic Tuff, Minerals Engineering, 16, p. 1363(2003).

[5] Olguına, M.T., Solache-Rıos a, M., Acosta b, D., Bosch c, P., Bulbulian, S., Uranium Sorption in Zeolite X: the Valence Effect, Microporous and Mesoporous Materials, 28, p. 377(1999).

[6] Kilincarslan Kaygun, A., Akyil, S., Study of the Behaviour  of  Thorium  Adsorption  on  PAN / Zeolite Composite Adsorbent, Journal of Hazardous Materials, 147, p. 357 (2007).

[7] Ciavatta, L., The Specific Intraction Theory in Evaluating Ionic Equilibria, Ann. Chim. (Rome), 70, p. 551(1980).

[8] Caputo, D., Dattilo, R. and Pansini, M., Computation of Thermodynamic Quantities of Ion Exchanger Reactionsinvolving Zeolites, Proc. III Convergo Nazionale di Scienza e Technologia delle Zeoliti, Cetraro, Italy, 143 (1995).

[9] Miura, H., Tachibana, F., Akiba, K., Ion Exchange Selectivity for Cesium in Ferrierites, J. Nucl. Sci. Technol., 2(29), p. 184 (1992).

[10] Aksoyoglu,  S., Sorption  of  U(IV)  on  Granite, J. Radioanal. Nucl. Chem., 134 (2), p. 393(1989).

[11] Ghasemi Mobtaker, H., Investigation of Cerium and Thorium Ion Exchange on Zeolite P Synthesized from Iranian Natural Clinoptilolite and Relevant Thermodynamic Parameters, MSc thesis, Dep. of Chem. Eng., Polytechnic University, Tehran, Iran (2001).