TY - JOUR
T1 - Immobilization of selenate in cancrinite using a hydrothermal method
AU - Pahlevi, Niko Dian
AU - Guo, Binglin
AU - Sasaki, Keiko
N1 - Funding Information:
The research funding was provided by the Japan Society for Promotion of Science (JSPS KAKENHI Grant Number JP16H02435 ). Additionally, the authors would like to acknowledge the “Advanced Graduate Program in Global Strategy for Green Asia” in Kyushu University for providing the student scholarship. Solid 27 Al-NMR and solid 29 Si-NMR spectra were collected at the Institute for Materials Chemistry and Engineering, Kyushu University.
PY - 2018/5
Y1 - 2018/5
N2 - 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 SeO42− in cancrinite/sodalite as a potential stable matrix was investigated at various reaction times using a hydrothermal method. Over time, the SeO42− 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 SeO42− 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 SeO42− 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.
AB - 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 SeO42− in cancrinite/sodalite as a potential stable matrix was investigated at various reaction times using a hydrothermal method. Over time, the SeO42− 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 SeO42− 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 SeO42− 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.
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U2 - 10.1016/j.ceramint.2018.02.083
DO - 10.1016/j.ceramint.2018.02.083
M3 - Article
AN - SCOPUS:85043473609
SN - 0272-8842
VL - 44
SP - 8635
EP - 8642
JO - Ceramics International
JF - Ceramics International
IS - 7
ER -