Immobilization of selenate in cancrinite using a hydrothermal method

Niko Dian Pahlevi, Binglin Guo, Keiko Sasaki

Research output: Contribution to journalArticle

Abstract

Because of the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, radioactive species were leaked out, including selenium isotopes (79Se). Developing a stable matrix that is suitable for longterm storage is necessary for the decommissioning process of the FDNPP. In the present work, the co-precipitation of SeO4 2− in cancrinite/sodalite as a potential stable matrix was investigated at various reaction times using a hydrothermal method. Over time, the SeO4 2− contents in the solid products gradually increased. The XRD patterns revealed that the reaction produced multi-phased precipitates, which were zeolite Na (P), sodalite, and cancrinite. As the SeO4 2− amount increased, the solid products were transformed to cancrinite. The calculated lattice parameter of sodalite and cancrinite showed an increase in lattice parameter a for sodalite and cancrinite, suggesting SeO4 2− incorporated into the sodalite/cancrinite structure. XRD, SEM, FTIR, 27Al-NMR, and 29Si-NMR results revealed the phase transformation of the solid products over time. Four stages of the co-precipitation mechanism are proposed, including the formation of zeolite P (Na), hydroxylation of zeolite P (Na), the formation of sodalite, and cancrinite reprecipitation.

Original languageEnglish
Pages (from-to)8635-8642
Number of pages8
JournalCeramics International
Volume44
Issue number7
DOIs
Publication statusPublished - May 1 2018

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Selenic Acid
Zeolites
Coprecipitation
Nuclear power plants
Lattice constants
Nuclear magnetic resonance
Decommissioning (nuclear reactors)
Hydroxylation
Selenium
Isotopes
Precipitates
Accidents
Phase transitions
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Immobilization of selenate in cancrinite using a hydrothermal method. / Pahlevi, Niko Dian; Guo, Binglin; Sasaki, Keiko.

In: Ceramics International, Vol. 44, No. 7, 01.05.2018, p. 8635-8642.

Research output: Contribution to journalArticle

Pahlevi, Niko Dian ; Guo, Binglin ; Sasaki, Keiko. / Immobilization of selenate in cancrinite using a hydrothermal method. In: Ceramics International. 2018 ; Vol. 44, No. 7. pp. 8635-8642.
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