| Mechanisms and kinetics of trisodium 2-hydroxy-1,1'-azonaphthalene-3,4',6-trisulfonate adsorption onto chitosan. | |
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MedLine Citation:
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PMID: 15897054 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Chitosan, a naturally abundant biopolymer, has widely been studied for metal adsorption from various solutions, but the extension of chitosan as an adsorbent to remove organic substances from water and wastewater has seldom been explored. In this study, the adsorption of an azo dye, trisodium 2-hydroxy-1,1'-azonaphthalene-3,4',6-trisulfonate (1), from aqueous solution onto the various degrees of deacetylated chitosan has been investigated. Equilibrium studies have been carried out to determine the capacity of chitosan for dye. The experimental data were analyzed using two isotherm correlations, namely, Langmuir and Freundlich equations. The linear correlation coefficients were determined for each isotherm and the Langmuir provided the best fit. The experimental adsorption isotherms were perfectly reproduced in the simulated data obtained from numerical analysis on the basis of the Langmuir model and the isotherm constants. Adsorption of (1) onto the chitosan flakes was found to be strongly depending on degrees of deacetylation in chitosan and temperatures. Significant amounts of (1) were adsorbed by chitosan 8B (higher degree of deacetylated chitosan), but the adsorption capacity was reduced remarkably with increasing solution temperatures. Thermodynamic parameters such as change in free energy (DeltaG), enthalpy (DeltaH), and entropy (DeltaS) were also determined. In addition, kinetic study indicated that the adsorption process mechanisms were both transport- and attachment-limited. |
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Authors:
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Tapan Kumar Saha; Subarna Karmaker; Hideki Ichikawa; Yoshinobu Fukumori |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of colloid and interface science Volume: 286 ISSN: 0021-9797 ISO Abbreviation: J Colloid Interface Sci Publication Date: 2005 Jun |
Date Detail:
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Created Date: 2005-05-17 Completed Date: 2006-11-01 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: United States |
Other Details:
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Languages: eng Pagination: 433-9 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh. tksaha_ju@yahoo.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Azo Compounds / chemistry* Chitosan / chemistry* Coloring Agents / chemistry* Kinetics Molecular Structure Naphthalenes / chemistry* Thermodynamics |
| Chemical | |
Reg. No./Substance:
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0/2-hydroxy-1,1'-azonaphthalene-3,4',6-trisulfonate; 0/Azo Compounds; 0/Coloring Agents; 0/Naphthalenes; 9012-76-4/Chitosan |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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