Studies on synthesis and adsorption properties of chitosan cross-linked by glutaraldehyde and Cu(II) as template under microwave irradiation

A series of cross-linked chitosan resins have been synthesized by forming chitosan coordination of Cu(II) as template in dilute acetic acid solutions tinder microwaves irradiation, then reacting the Cu(II)-chitosan complex with glutaraldehyde as cross-linking agent under microwave irradiation, and finally removing off the Cu(II) with dilute acid. The adsorption capacity and selectivity of the cross-linked chitosan for Cu2+, Ni2+ and Co2+ have also been investigated. The experimental results show that these resins obtained have better adsorption capacity for Cu2+ than Ni2+ and Co2+, very good stability and reusability in acidic solutions. (C) 2001 Elsevier Science Ltd. All rights reserved.