- P-ISSN 1225-0163
- E-ISSN 2288-8985
The adsorption characteristics of Cd(II) and Pb(II) ions has been studied by using chitin as an adsorbent. The pure chitin was obtained from the extraction of red-crab shell dumped by fish factory. Adsorption kinetics of Cd(II) and Pb(II) ions on the chitin reached at the maximum adsorption within two minutes. Adsorbed amounts of heavy metals were pH 7.0>10.5>3.5 in the following order. Adsorption ratio by chitin was 21<TEX>${\sim}$</TEX>99% for Cd(II) ion and 24<TEX>${\sim}$</TEX>95% for Pb(II) ion. Recovery ratio of Cd(II) ion on the chitin was 22<TEX>${\sim}$</TEX>53%, and that of Pb(II) ion was 22<TEX>${\sim}$</TEX>73%. The adsorption behavior of these heavy metals was explained well by Freundlich adsorption isotherm.