Abstract:

Heavy metal contaminant in water resource is one of considerable reason to cause serious water pollution in ecological environment.Chitosan has strong adsorption for heavy metals.Macroporous chitosan membrane was prepared by silica gel particle leaching method.Adsorption performance for Cu²⁺ was studied as well.By adding 3.0 g silica gel into 10%（mass fraction） acetic acid solution with 3.0 g chitosan dissolved in advance,a macroporous chitosan membrane with good adsorption property ultimately was prepared after cross-linking with glutaraldehyde.The 0.4 g prepared chitosan membrane was put in 40 mL,400 mg/L CuSO₄ solution,the membrane turned into blue after standing 25 h,the color of the solution transform into purple when murexide was used as indicator in chromogenic reaction,and the adsorption efficiency of Cu²⁺ was 93%.It demonstrated that the chitosan membrane had good adsorbability for Cu²⁺ and the membrane was easily separated from the solution after adsorption,which overcame the problem that the conventional adsorbent was difficult to separate solid and liquid in solution.

Key words: chitosan membrane, adsorption efficiency, Cu²⁺, murexide, silica gel