The Research on the Adsorbing Behavior of Chitosan for Heavy Metal Ions

摘要

Chitosan and N, O-carboxymethyl chitosan are non-toxic natural absorbents. In this paper, the adsorbing behavior of Chitosan and O, N-carboxymethyl Chitosan for Co~(2+) respectively were studied. The result indicated that the adsorbing ability of N, O-carboxymethyl chitosan was better than this of chitosan. The adsorbing ratio increased clearly with the increasing in the pH value of solution and absorbent amount, but it was not sensitive to the concentration of Co~(2+). Within ten minutes, the adsorbing ratio of above absorbents could achieve above 80%. But with time prolonging, the adsorbing ratio increased slowly. When time was more than 15 minutes and the pH value was higher than 10, the adsorption rate slowly flatted out.