Cesium immobilization in metakaolin-based geopolymers elucidated by 133Cs solid state NMR spectroscopy

被引：13

作者：

Arbel-Haddad, M. ^{[1
]}

Harnik, Y. ^{[2
]}

Schlosser, Y. ^{[3
]}

Goldbourt, A. ^{[3
]}

机构：

[1] Nucl Res Ctr Negev, POB 9001, IL-84901 Beer Sheva, Israel

[2] Israel Atom Energy Commiss IAEC, Tel Aviv, Israel

[3] Tel Aviv Univ, Sch Chem, IL-6997801 Ramat Aviv, Israel

来源：

JOURNAL OF NUCLEAR MATERIALS | 2022年 / 562卷

关键词：

Geopolymers; Nuclear waste immobilization; Radioactive cesium immobilization; 133Cs solid state NMR; Zeolite F; NUCLEAR-MAGNETIC-RESONANCE; FLY-ASH; CRYSTAL-STRUCTURE; CATION-EXCHANGE; ZEOLITES; WASTE; POLLUCITE; CHEMISTRY; CERAMICS; MINERALS;

D O I：

10.1016/j.jnucmat.2022.153570

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Geopolymers are promising candidates for nuclear-waste immobilization, and more specifically for the immobilization of radioactive cesium. Low-Si metakaolin-based geopolymers cured at temperatures of 40 degrees C in the presence of Cs ions generate a mixture of amorphous and crystalline phases including a Cs-bearing zeolite F phase. Using a combination of Cs-133 solid-state NMR and X-ray powder diffraction measurements we were able to show that Cs preferentially binds to zeolite F even when zeolite F is not the dominant phase in the matrix. Moreover, post-leaching NMR experiments indicate that zeolite F binds Cs more efficiently than the remaining crystalline or amorphous phases. Tailoring geopolymer formulations so that a large fraction of zeolite F is generated may therefore be a promising route for the production of immobilization matrices for cesium. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：7

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