TY - CONF
T1 - Immobilization process of selenate in cancrinite by hydrothermal method
AU - Pahlevi, Niko Dian
AU - Guo, Binglin
AU - Hirajima, Tsuyoshi
AU - Sasaki, Keiko
N1 - Funding Information:
The research funding was provided by the Japan Society for Promotion of Science (JSPS KAKENHI Grant Number JP16H02435). Also, the authors would like to acknowledge the “Advanced Graduate Program in Global Strategy for Green Asia” in Kyushu University to provide the student scholarship. Solid 27Al-NMR and solid 29Si-NMR spectra were collected at Institute for Materials Chemistry and Engineering, Kyushu University.
PY - 2017
Y1 - 2017
N2 - Anionic radionuclides are known to be hardly immobilized in most minerals and in addition they possess quite long half-life in the order of 105~107 years. In Fukushima Daiichi Nuclear Power Plant (FDNPP) anion exchange resin is utilized to immobilize these oxo-anions like selenate (79SeO42-)/selenite (79SeO32-) in Advanced Liquid Processing System. However, resins are not always suitable to store underground for long years, due to high biodegradability. The technologies for stable storage of anionic radionuclides are strongly desired to develop before decommissioning of the FDNPP reactor. It has been known that hydrocalumite and ettringite are typical anionic exchangers for selenite. However, these matrixes have low chemical stability under low pH conditions. In this study, cancrinite and sodalite were proposed as selenate matrixes, where both matrixes are stable in the wider range of pH.
AB - Anionic radionuclides are known to be hardly immobilized in most minerals and in addition they possess quite long half-life in the order of 105~107 years. In Fukushima Daiichi Nuclear Power Plant (FDNPP) anion exchange resin is utilized to immobilize these oxo-anions like selenate (79SeO42-)/selenite (79SeO32-) in Advanced Liquid Processing System. However, resins are not always suitable to store underground for long years, due to high biodegradability. The technologies for stable storage of anionic radionuclides are strongly desired to develop before decommissioning of the FDNPP reactor. It has been known that hydrocalumite and ettringite are typical anionic exchangers for selenite. However, these matrixes have low chemical stability under low pH conditions. In this study, cancrinite and sodalite were proposed as selenate matrixes, where both matrixes are stable in the wider range of pH.
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M3 - Paper
AN - SCOPUS:85065990739
T2 - 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
Y2 - 26 September 2017 through 29 September 2017
ER -