Article
  • A Study on Synthesis of Crosslinked Chitosan Phosphate and Adsorption Characteristics of Metallic Ione
  • Choi KS, Ahn HS
  • 가교 Chitosan계 인산유도체의 합성과 금속이온 흡착특성에 관한 연구
  • 최규석, 안형수
Abstract
The crosslinked chitin was prepared by the reaction of epichlorohydrin with chitin which was isolated from waste marine sources. and the crosslinked chitosan was prepared by deacetylation of the crosslinked chitin. Resin(I) was synthesized by the chlorination and phosphorylation of crosslinked chitosan using phosphorus oxychloride in dimethylformamide solvent. And Resin(Ⅱ) was prepared by the amination of Resin(I) in aqueous ammonia solution in the presence of KI. Finally, Resin(Ⅲ) was synthesized by the phosphorylation Resin(Ⅲ) with urea and phosphoric acid mixture. For these chelating polymer. the adsorption characteristics of infinitesimal amount of uranyl ion were investigated with the variation of pH, time and amount of adsorbent from fresh water, artificial seawater and natural seawater, respectively. The results were summarized as follows : with the increase of pH values, the amounts of uranium adsorbed increased and reached maximum at pH 5, but decreased at pH 6∼7 region. The adsorption of uranium by Resin(Ⅰ) reached equilibrium within 2 hours but Resin(Ⅱ) and Resin(Ⅲ) reached within 1 hour. It was observed that Resin(Ⅰ), Resin(Ⅱ) and Resin(Ⅲ) uptook uranium 3.22 μg/0.2g Resin(Ⅰ), 3.27μg/0.2g Resin(Ⅱ), 3.28μg/0.2g Resin(Ⅲ), respectively, from natural seawater. To the heavy metallic ions such as Co2-, Cu2+ and Ni2+ ions Resin(Ⅲ) showed 100% adsorptivity in pH 2∼6 range. To Hg2+ ion showed adsorptivity at pH 2 but gradually decreased with increase of pH values. To Cr6+ ion Resin(Ⅲ) showed about 80% adsorptivity in pH 2∼7 range.

수산계 폐기물인 게껍질로부터 단리한 chitin을 epichlorohydrin과 반응시켜 가교 chitin을 합성하였다. 이를 탈아세틸화하여 가교 chitosan을 제조하였고 dimethylformamide 존재하에서 phosphorus oxychloride 처리로 인산화와 염소화가 동시에 진행되어 새로운 킬레이트 고분자를 합성하였다. 이 유도체를 KI 공존하에 암모니아 수용액중에서 아미노화하여 아민기와 인산기를 가진 고기능성 킬레이트 고분자를 합성하였다. 합성된 수지들의 초미량 uranyl ion에 대한 인공해수 및 천연해수로부터 흡착특성을 조사한 결과, pH의 증가와 더불어 흡착능력은 증가하여 pH 5에서 최대를 나타냈으며, pH 6∼7 영역에서는 흡착능력이 감소되었다. 클로로 및 인산유도체의 흡착은 2시간 이내, 아미노 및 인산유도체에 의한 흡착은 1시간 이내에 완료되었다. 천연해수 19 중에 용존하는 이들 Resin(I), Resin(Ⅱ) 및 Resin(Ⅲ)의 우라늄의 회수량은 수지 0.2g 당 각자 3.22 μg, 3.27 μg,3.28 μg 이었다. 중금속이온들 중 Co2-, Cu2+, Ni2+ 등은 pH 2∼6에서 100%의 흡착능력을 나타내었으며, Hg2+ 이온은 pH 2에서 흡수 최대값을 나타내었고 Cr6+은 pH 2∼7에서 80% 정도의 흡착능력을 나타내었다. Co2-, Cu2+ 및 Ni2+ 등은 알칼리금속이나 알칼리토금속에서의 선택적분리가 기대된다.

References
  • 1. Muzzarelli RAANatural Chelating Polymer, Pergamon, New York (1973)
  •  
  • 2. Muzzarelli RAAChitin, Pergamon, New York (1977)
  •  
  • 3. Mima S, Miya M, Iwamoto R, Yoshikawa S, J. Appl. Polym. Sci., 28, 1909 (1983)
  •  
  • 4. Kurita K, Sannan T, Iwakura Y, J. Appl. Polym. Sci., 23, 511 (1979)
  •  
  • 5. Maruca R, Suder BJ, Wightman JP, J. Appl. Polym. Sci., 27, 4827 (1982)
  •  
  • 6. Muzzarelli RAA, Tubertini O, Talanta, 16, 1571 (1969)
  •  
  • 7. Hirano S, Kondo Y, Nakazawa Y, Carbohydrate Res., 100, 431 (1982)
  •  
  • 8. Egawa H, 高分子, 34, 634 (1985)
  •  
  • 9. Sakaguchi T, Horikosh T, Nakajima A, Agric. Biol. Chem., 45, 2191 (1981)
  •  
  • 10. Vigo T, Welch CM, Carbohydrate Res., 32, 331 (1974)
  •  
  • 11. Ohnishi K, Hori Y, Bunseke Kagaku, 26, 74 (1977)
  •  
  • 12. Nakajima A, Horikoshi T, Sakaguchi T, Agric. Biol. Chem., 43, 625 (1979)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1990; 14(5): 516-526

    Published online Oct 25, 1990