Abstract: Chitosan was reacted with dimethyl 3,3'-dithiodipropionate to obtain chitosan derivative through acetylation modification. With chitosan/chitosan derivative as raw materials,potassium persulfate(KPS) as initiator and N,N'-methylene diacrylamide(NMBA) as crosslinking agent,the chitosan aerogel and chitosan derivative aerogel were synthesized. The structure and properties of chitosan and its derivative were characterized and analyzed by FT-IR,XRD and TG. Meanwhile,chitosan aerogel and chitosan derivative aerogel were characterized by SEM. In addition,the static adsorption of Cu²⁺ ions on chitosan aerogel and chitosan derivative aerogel were also investigated. The FT-IR showed that the chitosan derivative was successfully synthesized. The XRD and TG analysis showed that the crystallinity and thermal stability of chitosan derivative decreased compared with those of chitosan. The SEM showed that the number of pores in the chitosan derivative aerogel increased. The results of adsorption experiment indicated that the chitosan derivative aerogel showed noticeable improvements in the adsorption capacity of Cu²⁺ ions. And under the conditions of 25℃,chitosan derivative aerogel 50mg,initial mass concentration of Cu²⁺ 100mg/L and pH value 5,the adsorption reached equilibrium at 60min with the maximum adsorption capacity of 48.26mg/g,which increased by 63.37% than that of unmodified chitosan aerogel.

Key words: chitosan, aerogel, heavy metal ions, adsorption