A Study on the Synthesis of Carboxymethyl Chitin and Separation of Alkali-Earth Metal ions by Adsorption

Carboxymethyl Chitin의 합성 및 알칼리 토금속 이온의 흡착분리에 관한 연구

  • Choi, Kyu-Suk (Department of Industrial Chemistry, College of Eng., Hanyang University) ;
  • Chang, Byung-Kwon (Department of Industrial Chemistry, College of Eng., Hanyang University) ;
  • Kim, Chong-Hee (Department of Industrial Chemistry, College of Eng., Hanyang University) ;
  • Kim, Yong-Moon (Deaprtment of Enviromental Eng., College of Science and Eng., Kwandong University)
  • 최규석 (한양대학교 공과대학 공업화학과) ;
  • 장병권 (한양대학교 공과대학 공업화학과) ;
  • 김종희 (한양대학교 공과대학 공업화학과) ;
  • 김용무 (관동대학교 이공대학 환경공학과)
  • Received : 1991.06.21
  • Published : 1991.09.30

Abstract

Carboxymethyl chitin(CM-chitin) was prepared by the reaction of alkali chitin with monochloroacetic acid in isopropyl alcohol. According to the pH variation, the adsorptivity of this chelating polymer to the alkali-earth metal ions such as $Ca^{2+},\;Mg^{2+}$, $Sr^{2+}$, $Ba^{2+}$ ions was determined by batch method. The adsorption tendency of this chelating polymer to most metal ions was increased with the increase of pH. The highest degree of adsorption was observed toward $Ca^{2+}$ ion among the alkali-earth metal ions. The selectivity adsorption property toward $Ca^{2+}$ ion was examined in the solution of $Ca^{2+}$ and $Mg^{2+}$ ions, and it was observed that CM-chitin showed excellent selectivity to $Ca^{2+}$ ion than $Mg^{2+}$ ion. $Mg^{2+}$ ion bound to CM-chitin molecule in the presence of $Ca^{2+}$ ion owing to low equilibrium constant. In the adsorption experiment of $Ca^{2+}$ and $Mg^{2+}$ ions to the CM-chitin under coexistence of $Na^+$ and $K^+$ ions, it observed that adsorptivity of only $Ca^{2+}$ ions was not affected by these monovalent cations.

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Acknowledgement

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