Preparation and adsorption properties of metal ions of crosslinked chitosan azacrown ethers

The novel azacrown ether chitosan derivatives (CCAE-I, CCAE-II) were prepar ed by reaction between crosslinked chitosan with epoxy-activated azacrown e thers. Their structures were confirmed by elemental FTIR spectra analysis a nd X-ray diffraction analysis. The adsorption and selectivity properties of the crosslinked chitosan azacrown ethers for Pb2+, Cu2+, Cr3+, Cd2+ and Hg 2+ were also investigated. The experimental results showed that they have h igh adsorption capacity for Cu2+, Cd2+, and Hg2+. The adsorption capacity o f CCAE-II is higher than CCAE-I for Cd2+ and Hg2+. The selectivity properti es of CCAE are better than chitosan and crosslinked chitosan. (C) 1999 John Wiley & Sons, Inc.