Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34961
Title: Adsorption of acid dyes on chitosan-equilibrium isotherm analyses
Authors: Wong, YC
Szeto, YS 
Cheung, W
McKay, G
Keywords: Chitosan
Acid dyes
Langmuir
Freundlich
Redlich–Peterson
Adsorption isotherms
Issue Date: 2004
Publisher: Elsevier
Source: Process biochemistry, 2004, v. 39, no. 6, p. 695-704 How to cite?
Journal: Process biochemistry
Abstract: The ability of chitosan, derived from deacetylated crab shell chitin, to remove acid dyes from effluent solution by adsorption has been studied. Equilibrium isotherms for the adsorption of five acid dyes, Acid Green 25 (AG25), Acid Orange 10 (AO10), Acid Orange 12 (AO12), Acid Red 18 (AR18) and Acid Red 73 (AR73), on chitosan were measured experimentally. Results were analysed by the Langmuir, Freundlich and Redlich-Peterson (R-P) equation using a linearised correlation coefficient. The Langmuir isotherm gave the best correlation for the adsorption of AG25, AR18, AR73 and AO12 while the composite Freundlich isotherm gave excellent correlation for AO10. The equilibrium data were then analysed using five different non-linear error analysis methods and two significant findings were obtained. Firstly, the order of isotherm selection was changed showing that the R-P equation had the lowest error values for all five acid dye-chitosan isotherms. Secondly, the values of the individual isotherm constants changed with the error methodology selected.
URI: http://hdl.handle.net/10397/34961
ISSN: 0032-9592
DOI: 10.1016/S0032-9592(03)00152-3
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