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The role of anatase in the behavior of heavy metals in the soil environemnt

Research Project

Project/Area Number 18H01571
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22060:Environmental systems for civil engineering-related
Research InstitutionYamaguchi University

Principal Investigator

SUZUKI TASUMA  山口大学, 大学院創成科学研究科, 准教授 (00577489)

Co-Investigator(Kenkyū-buntansha) 隅本 倫徳  山口大学, 大学院創成科学研究科, 准教授 (40414007)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Keywords土壌汚染 / 地下水汚染 / 重金属類 / 微量金属酸化物 / 二酸化チタン / 重金属 / 溶出 / 土壌 / アナターゼ / 計算化学 / 金属酸化物 / カオリナイト / 土壌・地下水汚染
Outline of Final Research Achievements

This study was performed to enhance the understanding of the leaching mechanism of heavy metals from contaminated kaolinite with a focus on the role of anatase impurities. Anatase showed significantly higher Cd(II) adsorption capability than those of kaolinite and goethite (α-FeOOH), with inner-sphere complex formation as the dominant adsorption mechanism. Under acidic and near-neutral conditions, kaolinite absorbs Cd(II) mainly via outer-sphere complex formation, while both outer-sphere and inner-sphere complex formation are important at higher pH. Binding constants obtained from modeling analyses were then used to predict the leaching extent of Cd(II) from contaminated kaolinite with different contents of anatase impurity at pH 4.0 - 7.0. The experimental data and model predictions consistently showed that the leaching of Cd(II) decreased with increasing anatase content and this trend was more significant under acidic conditions.

Academic Significance and Societal Importance of the Research Achievements

土壌・地下水汚染は我が国における重要な環境問題である。土壌・地下水を汚染する物質の中で、重金属類(例:鉛、カドミウム、ヒ素、フッ素)による汚染は報告件数が多いが、土壌環境中における重金属類の挙動については、挙動に影響を与える土壌因子を含めて未解明である。そこで本研究では、これまでの研究では着目されてこなかった二酸化チタンに着目し、二酸化チタンと重金属類の親和性を定量的評価するとともに、その重要性を明らかにするための実験を行った。その結果、二酸化チタンは鉛やカドミウムなどの重金属と親和性が高く、二酸化チタンの含有量が高い土壌からはこれらの重金属が溶出しにくいことが明らかになった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (6 results)

All 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Influence of pH and cations contained in rainwater on leaching of Cd(II) from artificially contaminated montmorillonite2020

    • Author(s)
      Suzuki, T.; Nakase, K.; Tamenishi, T.; Niinae, M.
    • Journal Title

      Journal of Environmental Chemical Engineering

      Volume: 8 Issue: 5 Pages: 104080-104080

    • DOI

      10.1016/j.jece.2020.104080

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The role of anatase impurity in the leaching of Cd(II) from contaminated kaolinite2019

    • Author(s)
      Tasuma Suzuki、 Kisho Nakase、 Satoshi Kakoyama、 Jyunko Takamuro、 Miyu Okita、 Masakazu Niinae
    • Journal Title

      Journal of Environmental Chemical Engineering

      Volume: 7 Issue: 1 Pages: 102851-102851

    • DOI

      10.1016/j.jece.2018.102851

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 人工汚染底質からのカドミウムの溶出にアナターゼの含有量と溶出液の塩分濃度が与える影響2019

    • Author(s)
      鈴木祐麻, 中瀬貴将,新苗正和
    • Journal Title

      環境資源工学

      Volume: 66(3) Pages: 105-111

    • NAID

      130007815636

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 汚染底質からのカドミウムの溶出にアナターゼの含有量と溶出液の塩分濃度が与える影響2019

    • Author(s)
      鈴木祐麻, 中瀬貴将,新苗正和
    • Organizer
      日本海水学会若手会第6回海水・生活・化学連携シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] 汚染土壌からのカドミウムの溶出にアナターゼが与える影響の定量的評価2019

    • Author(s)
      鈴木祐麻, 中瀬貴将,新苗正和
    • Organizer
      環境システム計測制御学会第31回研究発表
    • Related Report
      2019 Annual Research Report
  • [Presentation] カドミウムのモンモリロナイトへの吸着および溶出特性2019

    • Author(s)
      為西友宏, 中瀬貴将,鈴木祐麻, 新苗正和
    • Organizer
      日本海水学会若手会第6回海水・生活・化学連携シンポジウム
    • Related Report
      2019 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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