Chitosan(Chitin)/Cellulose Composite Biosorbents Prepared Using Ionic Liquid for Heavy Metal Ions Adsorption

摘要

Chitosan(chitin)/cellulose composites as biodegradable biosorbents were prepared under an environment-friendly preparation processes using ionic liquids.Infrared and X-ray photoelectron spectra indicated the stronger intermolecular hydrogen bond between chitosan and cellulose,and the hydroxyl and amine groups were believed to be the metal ion binding sites.Among the prepared biosorbents,freeze-dried composite had higher adsorption capacity and better stability.The capacity of adsorption was found to be Cu(II) (0.417 mmol/g) > Zn(II) (0.303 mmol/g) > Cr(VI) (0.251 mmol/g) > Ni(II) (0.225 mmol/g) > Pb(II) (0.127 mmol/g) at the same initial concentration 5 mmol L~(-1) .In contrast to some other chitosan-type biosorbenrts,preparation and component of the biosorbent were obviously more environment friendly.Moreover,adsorption capacity of chitosan in the blending biosorbent could be fully shown.