Document Detail


Diffusion models for adsorption kinetics of Zn(2+ ), Cd(2+ ) and Pb(2+ ) onto natural zeolite.
MedLine Citation:
PMID:  20818056     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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) cm(2)/min. The diffusion coefficients depend on initial concentration for both models.
Authors:
Julija Taparcevska; Liljana Markovska; Bogdana Koumanova; Vera Meshko
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  62     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2010  
Date Detail:
Created Date:  2010-09-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1136-42     Citation Subset:  IM    
Affiliation:
International Balkan University, Samoilova 10, 1000 Skopje, Republic of Macedonia. taparcevskajulija@yahoo.com
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