Preparation of modified chitosan microspheres and their application in adsorption of chlorophenol
新型改性壳聚糖微球的制备及其对氯酚的吸附研究

Chitosan microspheres were prepared by an inverse phase suspension method. The chitosan was modified by reducing Schiff bases formed from the reaction of n-heptaldehyde and chitosan. The microsphere structures were characterized by FTIR and photomicroscopy. The effects of adsorption conditions, such as time, pH, amount of added sodium chloride and the concentration of 2,4-dichlorophenol, on the adsorption capacity were investigated. The experimental results indicated that the microspheres were insoluble in water, and acidic and basic solutions. The microspheres adsorbed 2,4-dichlorophenol very well. In an aqueous solution at pH6,the adsorption reached 492.2 mg·g-1 in 3hours. The adsorption data of 2,4-dichlorophenol on the modified chitosan microspheres was fitted to the Freundlich isotherm.