Synthesis and Adsorption Properties for Metal lons of Mesocyclic Diamine-Grafted Chitosan-Crown Ether

摘要

A new type of grafted chitosan-crown ether was synthesized using mesocyclic diamine crown ether as the grafting agent. The C2 amino group in chitosan was protected from the reaction between benzaldehyde and chitosan to form N-benzylidene chitosan (CTB).After reaction with mesocyclic diamine crown ether of the epoxy propane group to give mesocyclic diamine-N-benzalidene chitosan (CTBA),the Schiff base was removed in a dilute ethanol hydrochloride solution to obtain chitosan-crown ether (CTDA).Its structure was confirmed by FTIR spectra analysis and X-ray diffraction analyusis. Its static adsorption properties for Pb(II),Cu(II),Cd(II),and Cr(III) were studied. The experimental results showed that the grafted chitosan-crown ehter has high selctivity for the adsorption of Cu(II) in the presence of Pb(II),Cu(II),and Cd(II), and its adsorption selectivity is better than that of chitosan.