Microscopic analyses of complexes formed in adsorbent for Mo and Zr separation chromatography

Ryoji Abe, Kohei Nagoshi, Tsuyoshi Arai, Sou Watanabe, Yuichi Sano, Haruaki Matsuura, Hideaki Takagi, Nobutaka Shimizu, Masashi Koka, Takahiro Sato

Research output: Contribution to journalArticle

Abstract

Molybdenum and zirconium obstruct the efficient recovery of minor actinides (MA(III): Am(III) and Cm(III)) by extraction chromatography; hence, the removal of these elements prior to MA(III) recovery is desirable. The use of an adsorbent impregnated with bis(2-ethylhexyl) hydrogen phosphate (HDEHP) for Mo and Zr decontamination was evaluated in this report. The adsorption/elution and column separation experiments showed that Mo and Zr in the simulated HLLW were selectively adsorbed on the particles, and that Mo was eluted by H2O2. EXAFS analysis and SAXS patterns of the adsorbent containing Zr revealed that the Zr-HDEHP complex had a crystal-like periodic structure similar to the structure of the precipitate produced in the solvent extraction system. Micro-PIXE analysis revealed that distribution of the residual Zr on the adsorbent was uniform.

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chromatography
Chromatography
adsorbents
Adsorbents
recovery
Recovery
decontamination
solvent extraction
elution
Decontamination
Actinides
Periodic structures
Microanalysis
Solvent extraction
microanalysis
Zirconium
Molybdenum
molybdenum
Precipitates
precipitates

Keywords

  • EXAFS
  • Extraction chromatography
  • Micro-PIXE
  • SAXS
  • Zr

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Microscopic analyses of complexes formed in adsorbent for Mo and Zr separation chromatography. / Abe, Ryoji; Nagoshi, Kohei; Arai, Tsuyoshi; Watanabe, Sou; Sano, Yuichi; Matsuura, Haruaki; Takagi, Hideaki; Shimizu, Nobutaka; Koka, Masashi; Sato, Takahiro.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 10.08.2016.

Research output: Contribution to journalArticle

Abe, Ryoji ; Nagoshi, Kohei ; Arai, Tsuyoshi ; Watanabe, Sou ; Sano, Yuichi ; Matsuura, Haruaki ; Takagi, Hideaki ; Shimizu, Nobutaka ; Koka, Masashi ; Sato, Takahiro. / Microscopic analyses of complexes formed in adsorbent for Mo and Zr separation chromatography. In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2016.
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author = "Ryoji Abe and Kohei Nagoshi and Tsuyoshi Arai and Sou Watanabe and Yuichi Sano and Haruaki Matsuura and Hideaki Takagi and Nobutaka Shimizu and Masashi Koka and Takahiro Sato",
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AU - Abe, Ryoji

AU - Nagoshi, Kohei

AU - Arai, Tsuyoshi

AU - Watanabe, Sou

AU - Sano, Yuichi

AU - Matsuura, Haruaki

AU - Takagi, Hideaki

AU - Shimizu, Nobutaka

AU - Koka, Masashi

AU - Sato, Takahiro

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N2 - Molybdenum and zirconium obstruct the efficient recovery of minor actinides (MA(III): Am(III) and Cm(III)) by extraction chromatography; hence, the removal of these elements prior to MA(III) recovery is desirable. The use of an adsorbent impregnated with bis(2-ethylhexyl) hydrogen phosphate (HDEHP) for Mo and Zr decontamination was evaluated in this report. The adsorption/elution and column separation experiments showed that Mo and Zr in the simulated HLLW were selectively adsorbed on the particles, and that Mo was eluted by H2O2. EXAFS analysis and SAXS patterns of the adsorbent containing Zr revealed that the Zr-HDEHP complex had a crystal-like periodic structure similar to the structure of the precipitate produced in the solvent extraction system. Micro-PIXE analysis revealed that distribution of the residual Zr on the adsorbent was uniform.

AB - Molybdenum and zirconium obstruct the efficient recovery of minor actinides (MA(III): Am(III) and Cm(III)) by extraction chromatography; hence, the removal of these elements prior to MA(III) recovery is desirable. The use of an adsorbent impregnated with bis(2-ethylhexyl) hydrogen phosphate (HDEHP) for Mo and Zr decontamination was evaluated in this report. The adsorption/elution and column separation experiments showed that Mo and Zr in the simulated HLLW were selectively adsorbed on the particles, and that Mo was eluted by H2O2. EXAFS analysis and SAXS patterns of the adsorbent containing Zr revealed that the Zr-HDEHP complex had a crystal-like periodic structure similar to the structure of the precipitate produced in the solvent extraction system. Micro-PIXE analysis revealed that distribution of the residual Zr on the adsorbent was uniform.

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