가교 N-Methylthiobenzyl-chitosan bead 와 chitosan bead 의 금속이온의 선택적 흡착능력

Cross linked chitosan beads showed high selective adsorbabilities in order of Au3+> Hg2+> Cu2+> Cd2+>Pt4+> UO22+ ions in mixed solution of various metal ions at pH 4.5. N-methylthiobenzyl chitosan beads(MTB-chitosan beads) were synthesized treating with p-(methylthio) benzaldehyde after cross linking of chitosan beads to give them a high selectivity in adsorption of metal ions. The MTB-chitosan beads dem-onstrated their selectivity on precious metals among various metal ions distinctively. Particularly, the MTB-chitosan had a Peculiar selective adsorption on Pd2+, Au2+, and Hg2+ ions whilst the cross-linked chitosan beads showed its high adsorption on Pd2+ ai pH 1.1. Alkaline earth metal ions were not adsorbed on cross-linked MTB-chitosan and chitosan beads at both pH ranges.