| 초록 |
Chitosan was useful to adsorb heavy metal ions. Bead-typed chitosans with optimized surface area were not prepared yet. If prepared, bead-typed chitosans in water was easily broken by outer small physical shocks, which was caused by its less crosslinking points. Therefore, in order to get bead-typed chelating resins with good adsorption toward heavy metal ions, polystyrene-based resins were prepared by suspension polymerization of styrene and divinyl benzene. The resins were modified with thionyl chloride. On the other hand, chitosan was prepared by the deacetylation of chitin under acid media. After this, the reaction of chitosan with polystyrene-based resins with sulfonyl chloride was carried out, which were made to mutually link sulfonamide structure. That is, polystyrene structure as a matrix of bead and chitosan as chelating structure were selected. Then, chelating resins with chitosan structure compared to only bead-typed chitosans showed good dimension stability in water, and were relatively stable to outer intentionally mechanical shocks. At the same time, they showed high adsorption capacity for heavy metal ions like Pb2+, Hg2+, Ni2+, and Cr3+, etc.; in special, adsorption for Hg2+ was very good. It was also found that the chelating resins prepared by using polystyrene-based resins with chitosan structure were more useful than those by chitosan. |
