Preparation of Biopolymeric Microcapsules and Their Uptake Properties for the Heavy Metal Ions

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  • OUTOKESH Mohammad
    Quantum Science & Energy Engineering, Graduate School of Engineering, Tohoku University
  • MIMURA Hitoshi
    Quantum Science & Energy Engineering, Graduate School of Engineering, Tohoku University
  • NIIBORI Yuichi
    Quantum Science & Energy Engineering, Graduate School of Engineering, Tohoku University
  • TANAKA Kouichi
    Quantum Science & Energy Engineering, Graduate School of Engineering, Tohoku University

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An organic extractant, Cyanex 302, having a relatively high selectivity toward the soft metal ions, was microencapsulated in the alginate biopolymer matrices. Various shapes of microcapsules such as granule, fiber and film were prepared by contacting a kneaded sol of HA and sodium alginate with a gelling solution. The uptake of Cd2+ for microcapsules attained equilibrium within 20 h, and Cd2+ ions were selectively adsorbed on microcapsules even in the presence of 0.1 M HNO3 or 1 M NaNO3. The uptake (%) of other heavy metal ions, Ag, Pb, Cu and Zn on microcapsules was above 96%, suggesting a possibility of simultaneous removal of soft metal ions. The uptake ability of Cd2+ for microcapsules was superior to that for conventional adsorbents in the presence of 0.1M HNO3. The column packed with granular microcapsules was effective for the successive removal of Cd2+ ions.

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