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A Study on Heavy Metals Removal in Aqueous Solution Using Autoclaved Chitosan  

김동석 (대구가톨릭대학교 응용과학부 환경과학)
이승원 (대구가톨릭대학교 응용과학부 환경과학)
Publication Information
Journal of Environmental Health Sciences / v.29, no.3, 2003 , pp. 50-58 More about this Journal
Abstract
Removal of heavy metal ions (Cd$^{2+}$, Cr$^{3+}$, Cu$^{2+}$, Pb$^{2+}$) by several chitosans was studied and the molecular weight of chitosan was investigated in order to examine the effect of autoclaving. Chitosan were divided into 3 groups (A type, controlled chitosan; B type, autoclaved for 15 min; C type, autoclaved for 60 min). The heavy metal removal capacity and rate of B type chitosan were higher than those of A type and B type chitosan. The molecular weight of chitosan was decreased by the increase of autoclaving time. Therefore, the heavy metal capacity was not well correlated to the molecular weight. Freundlich and Langmuir isotherm was determined from the experimental results of equilibrium adsorption for individual heavy metal ions on chitosan. Langmuir isotherm was well fitted to this experimental data. The heavy metal removal capacity of B type chitosan was in the order of Pb$^{2+}$ > Cu$^{2+}$ > Cd$^{2+}$> Cr$^{3+}$.3+/.$.3+/.
Keywords
Autoclaving; Chitosan; Molecular weight; Heavy metal ions;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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