Kohei Tokunaga

Profile Information

Affiliation: Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency

Degree: 博士(理学)(広島大学)

Researcher number: 50814729
J-GLOBAL ID: 201801000675640830
researchmap Member ID: B000329117

Research Interests

Research Areas

Natural sciences / Space and planetary science /

Research History

Apr, 2018 - Present

日本原子力研究開発機構 (研究員)
Apr, 2017 - Mar, 2018

日本原子力研究開発機構 (学振PD)
Oct, 2016 - Mar, 2017

東京大学 PD (学振PD)

Awards

Sep, 2022

2022年日本放射化学会奨励賞, 日本放射化学会

徳永紘平
Mar, 2018

2017年度センター長賞, 日本原子力研究開発機構先端基礎研究センター

徳永紘平
May, 2013

地球生命科学セクション学生優秀発表賞, 日本地球惑星連合科学大会

徳永紘平

Papers

Improved immobilization of Re(VII) from aqueous solutions via bimetallic Ni/Fe0 nanoparticles: Implications towards Tc(VII) removal

Ibrahim Maamoun, Kohei Tokunaga, Terumi Dohi, Futoshi Kanno, Omar Falyouna, Osama Eljamal, Kazuya Tanaka

Frontiers in Nuclear Engineering, 2(1142823), Mar, 2023 Peer-reviewed
Improvement of the Stability of IO₃^–-, SeO₃^2–-, and SeO₄^2–-Coprecipitated Barite after Treatment with Phosphate

Kohei Tokunaga, Kazuya Tanaka, Yoshio Takahashi, Naofumi Kozai

Environmental Science & Technology, 57(8) 3166-3175, Feb 13, 2023 Peer-reviewedLead author
Urea-Introduced Ionic Liquid for the Effective Extraction of Pt(IV) and Pd(II) Ions

Yuki Ueda, Ayano Eguchi, Kohei Tokunaga, Kei Kikuchi, Tsuyoshi Sugita, Hiroyuki Okamura, Hirochika Naganawa

Industrial & Engineering Chemistry Research, Apr 27, 2022
A Fluorous Phosphate for the Effective Extraction of LnIII from Nitrate Media: Comparison with A Conventional Organic Phosphate

Yuki Ueda, Kei Kikuchi, Kohei Tokunaga, Tsuyoshi Sugita, Noboru Aoyagi, Kazuya Tanaka, Hiroyuki Okamura

Solvent Extraction and Ion Exchange, 39(5-6) 491-511, Sep 19, 2021 Peer-reviewed
Effective removal of iodate by coprecipitation with barite: Behavior and mechanism

Kohei Tokunaga, Yoshio Takahashi, Kazuya Tanaka, Naofumi Kozai

Chemosphere, 266 129104-129104, Mar, 2021 Peer-reviewed
Correction to Effective Removal of Selenite and Selenate Ions from Aqueous Solution by Barite

Kohei Tokunaga, Yoshio Takahashi

Environmental Science & Technology, 52(1) 366-366, Jan 2, 2018 Peer-reviewed
A new technique for removing strontium from seawater by coprecipitation with barite.

Tokunaga, K, Kozai, N, Takahashi, Y

Journal of Hazardous Materials, 359 307-315, 2018 Peer-reviewed
Effective Removal of Selenite and Selenate Ions from Aqueous Solution by Barite

Kohei Tokunaga, Yoshio Takahashi

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 51(16) 9194-9201, Aug, 2017 Peer-reviewed
Ligand exchange adsorption and coordination structure of Pd on delta-MnO2 in NaCl solution

Kazuya Tanaka, Masato Tanaka, Naoko Watanabe, Kohei Tokunaga, Yoshio Takahashi

CHEMICAL GEOLOGY, 460 130-137, Jun, 2017 Peer-reviewed
Development of removal method of toxic elements by barite

Tokunaga Kohei, Takahashi Yoshio, Naofumi Kozai

Abstracts of Annual Meeting of the Geochemical Society of Japan, 64 170-170, 2017
Application of arsenic in barite as a redox indicator for suboxic/anoxic redox condition

Kohei Tokunaga, Tomoya Uruga, Kiyofumi Nitta, Yasuko Terada, Oki Sekizawa, Shinsuke Kawagucci, Yoshio Takahashi

CHEMICAL GEOLOGY, 447 59-69, Dec, 2016 Peer-reviewed
Influence of precipitation rate on distribution behavior between mineral and water by XAFS analysis

Tokunaga Kohei, Yokoyama Yuka, Takahashi Yoshio

Abstracts of Annual Meeting of the Geochemical Society of Japan, 61 83-83, 2014
Estimation of Se(VI)/Se(IV) ratio in water by the ratio recorded in barite

Kohei Tokunaga, Yuka Yokoyama, Yoshio Takahashi

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 14(11) 4826-4834, Nov, 2013 Peer-reviewed
Selenium Coprecipitated with Barite in Marine Sediments as a Possible Redox Indicator

Kohei Tokunaga, Yuka Yokoyama, Shinsuke Kawagucci, Aya Sakaguchi, Yasuko Terada, Yoshio Takahashi

CHEMISTRY LETTERS, 42(9) 1068-1069, Sep, 2013 Peer-reviewed

Misc.

Application of selenium coprecipitated with barite as a redox indicator

TOKUNAGA K., YOKOYAMA Y., SHINSUKE K., TAKAHASHI Y.

2013 22-22, Sep 5, 2013

Presentations

Application of selenium in barite as a new redox indicator (招待講演)

Tokunaga K, Yokoyama Y, Takahashi Y

Goldschmidit2014, Sacramento (America), Jun, 2014

Research Projects

Investigation of complex factors controlling arsenic accumulation in surface paddy soils and its application to nature-mimetic soil remediation

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
きのこ枯死後のセシウム溶出挙動に着目した森林内セシウム循環機構解明研究

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 2021 - Mar, 2024

香西直文, 数納広哉, 徳永紘平, 上田祐生
Effective removal and immobilize radioactive oxyanions from aqueous solutions by combination of the barite-coprecipitation and the subsequent solidification treatment.

Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2022

Tokunaga Kohei

Industrial Property Rights

特願2017-111915 放射性金属イオン含有汚染水の処理方法及び不溶化処理剤

大石徹, 高橋嘉夫, 徳永絋平

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Research Areas

Research History

Awards

Papers

Misc.

Presentations

Research Projects

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