Abstract: The adsorption behaviors of a new type chitosan crosslinked by aldehyde and epichlorohydrin (abbreviated to AECTS) for Zn²⁺ were investigated.The effects of temperature,pH of solvent,reaction time and regenerated number on adsorption quantity were studied,and the structure of adsorption products was characterized by Fourier transform IR and XPS.The results showed that the adsorption was realized by binding -NH₂ groups in AECTS with Zn²⁺,the experimental data were satisfied with the Freundlich isotherm adsorption equation,and the adsorption is an endothermic process.The AECTS resin has an excellent adsorption ability for Zn²⁺and fast adsorption rate.The adsorption quantity can reach 163 mg/g resin even when the initial concentration of Zn²⁺ is low to 1 g/L at 30℃,which is about 1.7 times that of the saturated absorption of chitosan.However,it was greatly influenced by pH value.The optimum pH value of adsorption of crosslinked chitosan for Zn²⁺ is 5.0.High adsorption quantity was still maintained when the AECTS resin had been reused for five times after regeneration.