Retention mechanism of cesium in chabazite embedded into metakaolin-based alkali activated materials

Chaerun, Raudhatul Islam; Soonthornwiphat, Natatsawas; Toda, Kanako; Kuroda, Kazuma; Niu, Xiaobo; Kikuchi, Ryosuke; Otake, Tsubasa; Elakneswaran, Yogarajah; Provis, John L.; Sato, Tsutomu

Retention mechanism of cesium in chabazite embedded into metakaolin-based alkali activated materials

Chaerun, Raudhatul Islam; Soonthornwiphat, Natatsawas; Toda, Kanako et al.

Journal of hazardous materials, 2022, 440, 129732

Permalink : https://hdl.handle.net/2115/87024

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アクセス権	open access
URI	https://hdl.handle.net/2115/87024
タイトル	Retention mechanism of cesium in chabazite embedded into metakaolin-based alkali activated materials
著者	Chaerun, Raudhatul Islam ; Soonthornwiphat, Natatsawas ; Toda, Kanako ; Kuroda, Kazuma ; Niu, Xiaobo ; Kikuchi, Ryosuke ; Otake, Tsubasa ; Elakneswaran, Yogarajah ; Provis, John L. ; Sato, Tsutomu
著者名 Chaerun, Raudhatul Islam
著者名 Soonthornwiphat, Natatsawas
著者名 Toda, Kanako
著者名 Kuroda, Kazuma
著者名 Niu, Xiaobo
e-Rad_Researcher 50832854 著者名 Kikuchi, Ryosuke
e-Rad_Researcher 80544105 著者名 Otake, Tsubasa
著者名 Elakneswaran, Yogarajah
著者名 Provis, John L.
e-Rad_Researcher 10313636 著者名 Sato, Tsutomu
言語	英語
キーワード	K-based AAM
	Pollucite
	Chabazite
	TEM
	FE-EPMA Raman
	spectroscopy
発行日	2022-10-15
出版者	Elsevier
収録物名	Journal of hazardous materials
巻(号)	440
ページ	129732
抄録	Disposal of cesium-137 (Cs-137)-loaded chabazite generated from decontaminating cooling water of the damaged reactor at the Fukushima Daiichi Nuclear Power Station (FDNPS) has become a crucial concern. The potassium aluminosilicate-based alkali activated material (K-AAM) matrix is one of the candidate encapsulation matrices proposed for encapsulating cesium-137. In this study, chabazite loaded with a low Cs concentration (1 mg/g of Cs), embedded into a K-AAM matrix (K-AAM-C), was analysed to determine its capability to immobilise Cs, which was investigated by batch leaching experiments, field emission-electron probe microscopy analysis (FE-EPMA), X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. The leaching experiments revealed that K-AAM-C efficiently immobilised Cs, with only 3 % of the Cs leached out after 360 days of leaching in deionised water. Characterisation using XRD, TEM, and Raman analysis confirmed that the alkali-activator was responsible for the phase transformation of chabazite. FE-EPMA demonstrated that K entered the chabazite structure. This phenomenon resulted in the breakdown and subsequent reconstruction of the chabazite structure. TEM observation showed that the Cs was concentrated into the aggregates of pre-cipitates, heterogeneously forming a pollucite-like structure in the chabazite after the fabrication process. Thermodynamic calculations indicated that pollucite was preferably stable in an AAM environment. When immersed in water, the amount of nano-pollucite increased over time, leading to the structural re-arrangement of aluminosilicate rings of chabazite according to TEM and Raman analysis. Pollucite is well known as a Cs-bearing natural zeolite, which can encapsulate Cs in its structure. Therefore, Cs retention was achieved in the spent chabazite adsorbent embedded into the K-AAM due to the resultant pollucite structure formed during AAM fabrication.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	0304-3894
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1016/j.jhazmat.2022.129732