Document Detail


Chitosan and chemically modified chitosan beads for acid dyes sorption.
MedLine Citation:
PMID:  19634439     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The capabilities of chitosan and chitosan-EGDE (ethylene glycol diglycidyl ether) beads for removing Acid Red 37 (AR 37) and Acid Blue 25 (AB 25) from aqueous solution were examined. Chitosan beads were cross-linked with EGDE to enhance its chemical resistance and mechanical strength. Experiments were performed as a function of pH, agitation period and concentration of AR 37 and AB 25. It was shown that the adsorption capacities of chitosan for both acid dyes were comparatively higher than those of chitosan-EGDE. This is mainly because cross-linking using EGDE reduces the major adsorption sites -NH3+ on chitosan. Langmuir isotherm model showed the best conformity compared to Freundlich and BET. The kinetic experimental data agreed very well to the pseudo second-order kinetic model. The desorption study revealed that after three cycles of adsorption and desorption by NaOH and HCl, both adsorbents retained their promising adsorption abilities. FT-IR analysis proved that the adsorption of acid dyes onto chitosan-based adsorbents was a physical adsorption. Results also showed that chitosan and chitosan-EGDE beads were favourable adsorbers and could be employed as low-cost alternatives for the removal of acid dyes in wastewater treatment.
Authors:
Kamari Azlan; Wan Ngah Wan Saime; Liew Lai Ken
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental sciences (China)     Volume:  21     ISSN:  1001-0742     ISO Abbreviation:  J Environ Sci (China)     Publication Date:  2009  
Date Detail:
Created Date:  2009-07-28     Completed Date:  2009-08-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100967627     Medline TA:  J Environ Sci (China)     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  296-302     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Universiti Pendidikan Sultan Idris, 35900 Perak, Malaysia. azlkam@yahoo.co.uk
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MeSH Terms
Descriptor/Qualifier:
Acids / chemistry*
Adsorption
Anthraquinones / chemistry
Chitosan / chemistry*
Coloring Agents / chemistry*
Cross-Linking Reagents / chemistry
Hydrogen-Ion Concentration
Materials Testing
Rhodamines / chemistry
Surface Properties
Waste Disposal, Fluid
Water Pollutants, Chemical / chemistry
Water Purification / methods
Chemical
Reg. No./Substance:
0/1-amino-9,10-dihydro-9,10-dioxo-4-(phenylamino)-2-anthracenesulfonic acid; 0/Acids; 0/Anthraquinones; 0/Coloring Agents; 0/Cross-Linking Reagents; 0/Rhodamines; 0/Water Pollutants, Chemical; 2609-88-3/lissamine rhodamine B; 9012-76-4/Chitosan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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