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Separation of f-elements based on control of coordination space by ligand-immobilized stimuli-responsive hydrogels

Research Project

Project/Area Number 18K19043
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionTokyo Institute of Technology

Principal Investigator

Nakase Masahiko  東京工業大学, 科学技術創成研究院, 助教 (70744332)

Co-Investigator(Kenkyū-buntansha) 松村 大樹  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 物質科学研究センター, 研究主幹 (30425566)
Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsゲル液抽出法 / ハイドロゲル / f元素分離 / 放射光XAFS / 時分割XAFS / X線小角散乱 / 錯形成空間制御 / 錯体化学 / 小角散乱 / 配位空間制御
Outline of Final Research Achievements

Separation of minor actinide (MA) from lanthanide (Ln) is an important task in advanced nuclear fuel cycle but difficult due to the chemical similarity. To enable such separation, ligand-immobilized hydrogels with thermosensitive property were developed and relation among adsorption property, local structure around metal ions and polymeric characteristics were systematically surveyed. General adsorption behavior of U(VI), Th(IV), Eu(III) and Nd(III) were studied by varying the ligands, chemical composition and solution condition such as acid concentration and temperature. The conventional and time-dispersive XAFS reveal that the coordination number of Eu(III) in gel can be changed by varying temperature, and such change can be triggered by the conformation change of polymer confirmed by SAXS experiment. The new concept, mutual separation of f-block element by controlling the coordination space in gel was studied from the viewpoint of coordination chemistry and polymer science.

Academic Significance and Societal Importance of the Research Achievements

難分離性の金属イオンを分離するための手法は様々な分野・領域において重要となっている。本研究では従来の水と油を用いる溶媒抽出法で用いられる配位子をゲルの3次元ネットワークに化学結合で取り込み、感温性を示すゲル吸着剤を合成した。ゲル吸着剤を用いた選択的な金属イオン吸着に及ぼす諸因子の影響を解明するため、錯体化学的手法と高分子化学的手法の両方を用いたアプローチを試みたことは学術的意義が高い。ゲル吸着剤を用いた“錯形成空間制御を利用したf元素分離”は、分離科学のみならず、ソフトマテリアル研究、錯体化学研究の発展にも資する基礎研究といえる。社会的意義の大きい分離試薬の開発につながると期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (9 results)

All 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Adsorption study of U and Th by N,O-hybrid donor ligand-immobilized hydrogels2019

    • Author(s)
      Nakase M.、Yamamura T.、Shirasaki K.、Nagai M.、Takeshita K.
    • Journal Title

      Separation Science and Technology

      Volume: 54 Issue: 12 Pages: 1952-1959

    • DOI

      10.1080/01496395.2019.1575881

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Study on U/Th separation by monoamide-immobilized hydrogel adsorbents2019

    • Author(s)
      M.Nakase, T.Yamamura, K.Shirasaki, M.Nagai, D.Matsumura, T.Kobayashi and K.Takeshita
    • Organizer
      GLOBAL2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of selective ligands for f-block elements differenciation -Relation between complex structure and coordination-2019

    • Author(s)
      M.Nakase and K.Takeshita
    • Organizer
      ASNFC 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Thサイクル研究の新アイディア- 234Uを仲立ちとしたサイクル高度化からゲル液抽出法を用いた再処理まで -2019

    • Author(s)
      中瀬正彦
    • Organizer
      第5回トリウム研究専門委員会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 配位子搭載型ハイドロゲルによる硝酸溶液からのウラン, トリウムの吸着分離2019

    • Author(s)
      中瀬 正彦,山村朝雄,白崎謙次,永井満家,小林徹,松村大樹,竹下健二
    • Organizer
      日本原子力学会2019春の年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 原子力バックエンドにおけるf元素分離 - 配位子設計開発からアプリケーションまで-2019

    • Author(s)
      中瀬正彦
    • Organizer
      群馬先端材料シンポジウム2019
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] N,O-ハイブリッドドナー型配位子を搭載した搭載型ハイドロゲルによる硝酸溶液からの6価ウランと4価トリウムの吸着分離2019

    • Author(s)
      中瀬正彦
    • Organizer
      平成30年度α研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] アクチノイドの分離科学―溶媒抽出からゲル液抽出まで―2019

    • Author(s)
      中瀬正彦
    • Organizer
      平成30年度熊取研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] Adsorption study of U and Th by N,O-hybrid donor ligand-immobilized hydrogels2018

    • Author(s)
      M. Nakase, T. Yamamura, K. Shirasaki, M. Nagai and K. Takeshita
    • Organizer
      20th International Conference on Separation Science and Technology for Energy Applications
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-07-25   Modified: 2021-02-19  

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