The kinetics of zinc, cadmium, and lead ions removal by natural zeolite-clinoptilolite has been investigated using an agitated batch adsorber. Batch experiments at constant temperature have been performed. The influence of agitation speed, initial heavy metals concentration and particle size of the sorbent on the removal efficiency of heavy metals from liquid phase have been studied. A decrease in the initial heavy metals concentration in aqueous solutions prolongs the time needed for equilibrium. Two kinetics models according to the Vermeulen's approximation and the parabolic diffusion model have been tested with the experimental data for adsorption of heavy metals onto natural zeolite. For the systems examined, the fit of the proposed models with the experimental data was shown to be equally good using both models. The diffusion coefficients are calculated from kinetic models of heavy metal ions and they are of the order from 10−5 to 10−6 cm2/min. The diffusion coefficients depend on initial concentration for both models.
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Research Article|
September 01 2010
Diffusion models for adsorption kinetics of Zn2+ , Cd2+ and Pb2+ onto natural zeolite
Julija Taparcevska;
1International Balkan University, Samoilova 10, 1000 Skopje, Republic of Macedonia E-mail: taparcevskajulija@yahoo.com; markovska@ibu.edu.mk; meshko@ibu.edu.mk
E-mail: taparcevskajulija@yahoo.com
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Liljana Markovska;
Liljana Markovska
1International Balkan University, Samoilova 10, 1000 Skopje, Republic of Macedonia E-mail: taparcevskajulija@yahoo.com; markovska@ibu.edu.mk; meshko@ibu.edu.mk
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Bogdana Koumanova;
Bogdana Koumanova
2Department of Chemical Engineering, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski, Sofia 1756, Bulgaria E-mail: bkk@uctm.edu
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Vera Meshko
Vera Meshko
1International Balkan University, Samoilova 10, 1000 Skopje, Republic of Macedonia E-mail: taparcevskajulija@yahoo.com; markovska@ibu.edu.mk; meshko@ibu.edu.mk
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Water Sci Technol (2010) 62 (5): 1136–1142.
Citation
Julija Taparcevska, Liljana Markovska, Bogdana Koumanova, Vera Meshko; Diffusion models for adsorption kinetics of Zn2+ , Cd2+ and Pb2+ onto natural zeolite. Water Sci Technol 1 September 2010; 62 (5): 1136–1142. doi: https://doi.org/10.2166/wst.2010.918
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