الفهرس 
Molecular weightOnly 14 pages are availabe for public view
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Abstract
Biopolymers have a vital role in both of industrial and medical fields because they are renewable, biodegradable, non-toxic, and hence they are considered environment friendly materials. Chitosan (CS) was widely used due to its high number of functional amines and hydroxyl groups, which improved its adsorption capacity to anionic molecules such as dyes and drugs through electrostatic attraction. However, CS is soluble in dilute organic acids and is difficult to be separated from the solution using traditional separation methods such as filtration and sedimentation. To overcome such a problem, various physical and chemical modifications were developed to improve the chemical stability of CS in acidic media. Recently, many researchers were interested in the chemical modification of CS by cross-linking method using cross-linking agents such as glutaraldehyde GLA), epichlorohydrin (ECH) and ethyleneglycol diglycidyl ether. Although the crosslinking methods were found to enhance the resistance of CS against acids, it reduced the adsorption capacity of CS. To overcome this problem, the present work was directed to modification of CS by different types of jeffamines (D2000-CS,ED600-CS, ED900-CS and ED2003-CS). In addition, ED600-CS/MMT nanocomposites were prepared. The properties and applications of the synthesized materials for adsorption of both anionic, cationic dyes were studied.