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Journal Articles

Recovery of minor actinides from spent fuel using TPEN-immobilized gels

Koyama, Shinichi; Suto, Mitsuo; Obayashi, Hiroshi; Oaki, Hiroshi*; Takeshita, Kenji*

Proceedings of International Nuclear Fuel Cycle Conference; Nuclear Energy at a Crossroads (GLOBAL 2013) (CD-ROM), p.549 - 553, 2013/09

A series of separation experiments was performed in order to study the recovery process for minor actinides (MAs) from the actual spent fuel by using an extraction chromatographic technique. The 10 mol% TPPEN-gel was used to improve adsorption coefficient of Am and a condition of eluent temperature was changed in order to confirm the temperature swing effect on TPEN-gel for MA. More than 90% Eu was detected in the eluent after washing with 0.01M NaNO$$_{3}$$ (pH 3.5) at 5$$^{circ}$$C. Americium was backwardly detected and eluted continuously during in the same condition. After removal of Eu, the eluent temperature was changed to 32$$^{circ}$$C, then Am was detected (pH 3.0). Finally remained Am could be stripped from TPPEN-gel by changing the pH of the eluent to 2.0.

Journal Articles

Recovery of minor actinides from spent fuel via an extraction chromatographic technique using TPPEN-immobilized gels

Koyama, Shinichi; Suto, Mitsuo; Obayashi, Hiroshi; Takeshita, Kenji*; Ogata, Takeshi*; Oaki, Hiroshi*; Inaba, Yusuke*

Separation Science and Technology, 47(14-15), p.2024 - 2028, 2012/11

 Times Cited Count:2 Percentile:12.81(Chemistry, Multidisciplinary)

A series of separation experiments was performed to study the recovery process for minor actinides (MAs) from the actual spent fuel by using an extraction chromatographic technique. TPPEN gel was used as a new extraction chromatographic agent. Mixed oxide fuel was used as a reference spent fuel to demonstrate the recovery of the MAs. The MOX fuel, including 29.9 wt% plutonium (Pu), was irradiated up to 119 GWd/MTM, and the fuel was then prepared for the extraction experiment. A Mixed solution of MAs and lanthanides (Lns) was prepared. The TPPEN gel was immersed in a 0.01 M NaNO$$_{3}$$ solution, and the pH was adjusted to 4.0. Next, an extraction column was prepared using the TPPEN gel, and the mixed solution of MAs and Lns was passed through the column. The Lns were detected in the eluent after washing with 0.01 M NaNO$$_{3}$$ (pH 4.0). For detecting the MAs, the pH of the eluent was changed to 2.0.

Oral presentation

Development of extraction chromatographic agents based on nitrogen-donor ligand for the separation of actinide

Ogata, Takeshi*; Takeshita, Kenji*; Oaki, Hiroshi*; Inaba, Yusuke*; Mori, Atsunori*; Matsumura, Tatsuro; Nakano, Yoshio*

no journal, , 

N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) is one of the podand-type ligands with six nitrogen-donors and recognize the slight difference in the softness between Am(III) and Eu(III). We have tried to synthesize a novel extraction chromatographic agent, which exploit such feature of TPEN. The use of the polymer gel as a support of the extractant can be expect to suppress the elution of the extractant and keep the flexibility of extractant. N,N,N',N'-tetrakis-(4-propenyloxy-2-pyridylmethyl)ethylenediamine (TPPEN) which is TPEN analog introducing polymerizable group to pyridine ring was used as a cross-linker of N-isopropylacrylamide (NIPA). Furthermore, the TPPEN-NIPA gel on highly porous silica was prepared to improve the mechanical strength of the gel. These extraction chromatographic agents have been tested for the separation of Am(III) and Eu(III). Characterization and extraction performance of the extraction chromatographic agents will be described.

Oral presentation

Separation behavior of Am(III) from lanthanide(III) by TPEN-NIPA Gel and the separation mechanism study

Suzuki, Shinichi; Akutsu, Kazuhiro; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Ogata, Tsuyoshi*; Takeshita, Kenji*; Inaba, Yusuke*; Ikeda, Atsushi; Kobayashi, Toru; Oaki, Hiroshi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of extraction chromatographic agent immobilizing TPEN-gels for separation of minor actinides, 3; Recovery of mnor actinide from the spent fuel

Suto, Mitsuo; Obayashi, Hiroshi; Koyama, Shinichi; Sekioka, Ken*; Takeshita, Kenji*; Inaba, Yusuke*; Ogata, Takeshi*; Oaki, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Development of extraction chromatographic agent immobilizing TPEN-gels for separation of minor actinides

Suzuki, Shinichi; Akutsu, Kazuhiro; Yaita, Tsuyoshi; Shiwaku, Hideaki; Kobayashi, Toru; Takeshita, Kenji*; Ogata, Takeshi*; Inaba, Yusuke*; Oaki, Hiroshi*; Mori, Atsunori*

no journal, , 

no abstracts in English

Oral presentation

Separation of MA and Ln by extraction chromatography using functional gel copolymerized with multidentate inclusion ligands, 3; Recovery of minor actinide from the spent fuel

Suto, Mitsuo; Obayashi, Hiroshi; Koyama, Shinichi; Sekioka, Ken*; Takeshita, Kenji*; Inaba, Yusuke*; Ogata, Takeshi*; Oaki, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Separation of MA and Ln by extraction chromatography using functional gel copolymerized with mmultidentate inclusion ligands, 1; Structure optimization of functional gel copolymerized with mmultidentate inclusion ligands by XAFS

Suzuki, Shinichi; Kobayashi, Toru; Shiwaku, Hideaki; Yaita, Tsuyoshi; Takeshita, Kenji*; Oaki, Hiroshi*; Mori, Atsunori*

no journal, , 

no abstracts in English

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