Determination of Adsorption Isotherms of Iminodiacetate-Type Chelating Fiber in Seawater and Proposal of Divided Immersion for Braids of Fiber in Contaminated Seawater in Closed Area of TEPCO Fukushima NPP

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  • 海水中でのイミノ二酢酸型キレート繊維の吸着等温式の決定と東電福島第一原発の閉鎖海域内汚染海水への組み紐状繊維の分割投入の提案
  • カイスイチュウ デ ノ イミノ ニ サクサンガタ キレート センイ ノ キュウチャク トウオンシキ ノ ケッテイ ト トウデン フクシマ ダイイチ ゲンパツ ノ ヘイサ カイイキ ナイ オセン カイスイ エ ノ クミヒモジョウ センイ ノ ブンカツ トウニュウ ノ テイアン

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Abstract

An iminodiacetate-type chelating fiber（IDA fiber）was prepared by means of radiation-induced graft polymerization of an epoxy-group-containing monomer, glycidyl methacrylate, onto a commercially available 6-nylon fiber and subsequent conversion of the epoxy group into an iminodiacetate group capable of removing radioactive strontium ions from seawater. Adsorption isotherms of the IDA fiber for three kinds of alkaline earth-metal group ions, i.e., Sr2＋, Ca2＋, and Mg2＋, in artificial seawater were found to be well described by ternary-component Langmuir adsorption isotherms. We proposed a strontium removal technique for the immersion of the fiber with a divided amount rather than an undivided amount into seawater in a closed area. The reduction in the amount of fiber required for an identical removal percentage of strontium was demonstrated in a batch mode. Experimental adsorption-equilibrium data as a function of the number of divided immersions agreed well with the curves calculated from the ternary-component Langmuir adsorption isotherms and mass-balance equations for each alkaline earth-metal ion.

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