Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23300
Title: Effect of temperature, particle size and percentage deacetylation on the adsorption of acid dyes on chitosan
Authors: Wong, YC
Szeto, YS 
Cheung, WH
McKay, G
Keywords: Acid dyes
Chitosan
Deacetylation
Equilibrium
Particle size
Temperature
Issue Date: 2008
Publisher: Springer
Source: Adsorption, 2008, v. 14, no. 1, p. 11-20 How to cite?
Journal: Adsorption 
Abstract: The adsorption of five acidic dyes on chitosan-a by-product from waste crustacean shell-has been studied. The equilibrium data have been studied using Langmuir, Freundlich and Redlich-Peterson equations. The best correlations are obtained using the Langmuir isotherm suggesting the mechanism involves one process step of dyes complexing with the free amino group. The effect of chitosan particle size was investigated and showed an increase in adsorption capacity with decreasing particle size indicating that the available external surface was an important factor. Increasing solution temperature resulted in an increase in adsorption capacity indicating an exothermic process with a negative ?GH. Finally, the effect of varying the percentage degree of deacetylation showed that from 52% to 97% resulted in decrease in the dye adsorption capacity suggesting that more amorphisation may cause changes in the internal structure of chitosan and reduce the capacity.
URI: http://hdl.handle.net/10397/23300
ISSN: 0929-5607
DOI: 10.1007/s10450-007-9041-5
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