Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer

Soonthornwiphat, Natatsawas; Kobayashi, Yutaro; Toda, Kanako; Kuroda, Kazuma; Islam, Chaerun Raudhatul; Otake, Tsubasa; Elakneswaran, Yogarajah; Provis, John L.; Sato, Tsutomu

Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer

Soonthornwiphat, Natatsawas; Kobayashi, Yutaro; Toda, Kanako et al.

Journal of Nuclear Science and Technology, 2020, 57(10), 1181-1188

Permalink : https://hdl.handle.net/2115/82853

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/82853
タイトル	Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer
著者	Soonthornwiphat, Natatsawas ; Kobayashi, Yutaro ; Toda, Kanako ; Kuroda, Kazuma ; Islam, Chaerun Raudhatul ; Otake, Tsubasa ; Elakneswaran, Yogarajah ; Provis, John L. ; Sato, Tsutomu
著者名 Soonthornwiphat, Natatsawas
著者名 Kobayashi, Yutaro
著者名 Toda, Kanako
著者名 Kuroda, Kazuma
著者名 Islam, Chaerun Raudhatul
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	Adsorption
	ion exchange
	strontium
	alkali activated material
	geopolymer
	titanate adsorbent
発行日	2020-10-02
出版者	Taylor & Francis
収録物名	Journal of Nuclear Science and Technology
巻(号)	57(10)
ページ	1181-1188
抄録	Titanate adsorbents have been used to remove Sr radioisotopes from contaminated water at the Fukushima Daiichi Nuclear Power Station site. This process leads to the generation of spent adsorbents, which require stabilization for long term storage and disposal. Geopolymers are candidates for matrices to achieve this consolidation. However, more data are needed to assess the leaching behavior of Sr from the adsorbents embedded in a geopolymer matrix. In this study, leaching experiments and observations of the Sr distribution of spent titanate adsorbent embedded in geopolymers, loaded with Sr at realistic concentrations were conducted. The experimental results illustrate that only 0.75% of the Sr was leached out from a K-geopolymer loaded with 30% (by solid weight) of spent adsorbent after 360 days of immersion in deionized water. From the observations of Sr distributions by electron and isotope microscopy, Sr remained in the titanate adsorbent and did not diffuse into the geopolymer matrix. Leaching of Sr (loaded at a similar concentration) from the K-geopolymer without the adsorbent was also limited, only 0.05% after 360 days of leaching. In conclusion, both titanate adsorbent in K-geopolymer matrix, and the K-geopolymer itself, offer an attractive potential for Sr immobilization.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Nuclear Science and Technologyon 02 Oct 2020, available online: http://www.tandfonline.com/10.1080/00223131.2020.1775717.
PISSN	0022-3131
EISSN	1881-1248
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1080/00223131.2020.1775717