Abstract：Under ultrasonic irradiation,with aprotic solvent dimethyl sulfoxide as solvent,a novel adsorbent cross-linked carboxymethyl chitosan was prepared. X-ray photoelectron spectroscopy and Fourier transform infrared spectrometry were employed for testing and characterization of the samples. With Pb2+,Cd2+ and Co2+ as the adsorbed objects,the influence of the initial concentration,adsorption time,pH and other factors on the adsorption process were investigated. Isotherm tests showed that the Langmuir adsorption model is suitable for simulation of the adsorption process of the metal ions on the surface of the cross-linked carboxymethyl chitosan,indicating that adsorption of the metal ions on the surface of the cross-linked carboxymethyl chitosan is monolayer adsorption and the maximum adsorption capacity of cross-linked carboxymethyl chitosan for Pb2+,Cd2+ and Co2+ was 282.49 mg/g,328.95 mg/g and 134.41 mg/g,respectively. Kinetic experiments showed that the pseudo-second-order equation was suitable to describe the adsorption process.
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