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

The novel azacrown ether chitosan derivatives (CCAE-I, CCAE-II) were prepared by reaction between crosslinked chitosan with epoxy-activated azacrown ethers. Their structures were confirmed by elemental FTIR spectra analysis and X-ray diffraction analysis. The adsorption and selectivity properties of the crosslinked chitosan azacrown ethers for Pb 2+ , Cu 2+ , Cr 3+ , Cd 2+ , and Hg 2+ were also investigated. The experimental results showed that they have high adsorption capacity for Cu 2+ , Cd 2+ , and Hg 2+ . The adsorption capacity of CCAE-II is higher than CCAE-I for Cd 2+ and Hg 2+ . The selectivity properties of CCAE are better than chitosan and crosslinked chitosan.