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A study on lead removal in aqueous solution using autoclaved chitosan

고온.고압 처리한 키토산을 이용한 수중의 납 제거에 관한 연구

  • 김동석 ;
  • 이승원 ;
  • 우형택
  • Published : 2003.12.01

Abstract

In order to know the effect of atuoclaving on the heavy metal removal using chitosan, lead removal capacities and removal rates by various chitosans in aqueous solution were compared according to the various autoclaving time. The lead removal efficiencies and removal rates by the autoclaved chitosan were found to be on the order of 15 min(98%) > 10 min(95%) > 30 min(83%) > 5 min(53%) > 60 min(47%) > 0 min(22%) chitosan. The molecular weight of chitosan was decreased by the increase of autoclaving time. Therefore, the heavy metal removal capacity was not well correlated to the molecular weight. Langmuir isotherm was well fitted to experimental results of equilibrium adsorption on chitosan. In order to examine the process of lead removal by the autoclaved chitosan, TEMs, SEMs and FT-IR analyses were used. The surface of autoclaved chitosan was much more porous and the lead removal was mainly occurred on the surface of chitosan. The structure of autoclaved chitosan was same as that of controlled chitosan.

Keywords

Chitosan;Autoclaving;Lead removal;TEM;SEM;FT-IR

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