Removal of Cesium Ions from Contaminated Seawater in Closed Area Using Adsorptive Fiber

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  • SOMEYA Taka-aki
    Department of Applied Chemistry and Biotechnology, Chiba University
  • ASAI Shiho
    Japan Atomic Energy Agency
  • FUJIWARA Kunio
    Department of Applied Chemistry and Biotechnology, Chiba University KJK Co.
  • SUGO Takanobu
    Department of Applied Chemistry and Biotechnology, Chiba University
  • UMENO Daisuke
    Department of Applied Chemistry and Biotechnology, Chiba University
  • SAITO Kyoichi
    Department of Applied Chemistry and Biotechnology, Chiba University

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Other Title
  • 吸着繊維を用いた閉鎖域内汚染海水からのセシウムの除去
  • キュウチャク センイ オ モチイタ ヘイサイキ ナイ オセン カイスイ カラ ノ セシウム ノ ジョキョ

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Abstract

Insoluble cobalt ferrocyanide（Co-FC）microparticles were impregnated onto a polymer chain grafted onto the surface of a 6-nylon fiber by means of radiation-induced graft polymerization and subsequent precipitation. The resultant Co-FC-impregnated fiber was immersed in either nonradioactive or radioactive cesium（Cs）solution in seawater in an initial Cs concentration range from 60 to 5.0×10－4 g-Cs/m3．The adsorption isotherm correlated well with a Langmuir-type equation. In addition, the mass-transfer capacity coefficient was determined by fitting the experimental data of the rate of Cs adsorption onto the Co-FC-impregnated fiber to theoretical adsorption curves based on the Cs concentration difference between the bulk and the interface in seawater as a driving force of the overall adsorption rate. Decontamination factors（DFs）as functions of fiber weight and the contact time required for the removal of cesium ions from the contaminated seawater in a closed area were estimated using the above-mentioned values.

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