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Polymer-Plastics Technology and Engineering Volume 43, 2004 - Issue 2
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Original Articles

Thermosole Cross-Linking of Chitosan and Utilization in the Removal of Some Dyes from Aqueous Solution

H. M. Fahmy Textile Research Division, National Research Center, Dokki, Cairo, EgyptCorrespondence[email protected]
,
Z. E. Mohamed Textile Research Division, National Research Center, Dokki, Cairo, Egypt
,
M. H. Abo-Shosha Textile Research Division, National Research Center, Dokki, Cairo, Egypt
&
N. A. Ibrahim Textile Research Division, National Research Center, Dokki, Cairo, Egypt
Pages 445-462 | Published online: 14 Feb 2007
 
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Abstract

Cross-linking of chitosan by the thermosole method was achieved using a dimethyloldihydroxyethyleneurea (DMDHEU) cross-linking agent in the presence of triethanolamine hydrochloride (TEA.HCl) as a catalyst under different conditions including time, temperature, and concentration of DMDHEU or TEA.HCl, and reagents to chitosan ratio. Two cross-linked chitosan substrates, having amino contents of 386 and 430 meg/100 g were prepared and characterized as ion exchangers by investigating their potentiometric titration as well as swelling in HCl or water. These two substrates were used for the removal of three dyes (direct, hydrolyzed reactive, or acid) from aqueous solutions under different pHs and time. The adsorption kinetics of the removal process were studied.

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