[Preparation and spectral analysis of coordination compounds of chitosan with Ce(III), Zr(IV), Pb(II) and Cd(II)].

Coordination compounds of chistosan (CTS) with Ce(III), Zr(IV), Pb(II) and Cd(II) (M-CTS) were prepared, which were synthesized by the reaction of CTS with cerium nitrate, zirconium nitrate, cadmium sulfate, and lead nitrate in acid systems. The coordination compounds were characterized by infrared spectrum (IR), X-ray diffraction spectrum (XRD) and X-ray photoelectron spectrum (XPS). The results showed that the N atom in amidogen of CTS coordinates with Cd in the coordination compounds of Cd-CTS, while in the coordination compounds of Ce-CTS, Zr-CTS and Pb-CTS, the N atom in amidogen and O atom in hydroxyl of CTS participate in the coordination reaction. It is suggested that the coordination bonds are different with the change of heavy metal ions.