Study on stable solidification of silica-based ammonium molybdophosphate adsorbing cesium: Micromechanics and density functional theory modeling

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外文摘要：© 2021 Elsevier B.V.Silica-based ammonium molybdophosphate (AMP/SiO2) adsorbent can effectively remove 137Cs from simulated wastewater discharged during the Fukushima NPP-1 accident. A pressing/sintering method for the final disposal of the spent Cs adsorbent was described herein. Immobilization of Cs in the stable ceramic solid form of Cs4Al4Si20O48 was accomplished using natural mordenite. Different sintering temperatures and duration times exerted different effects on the final microstructures and the mechanical and loading abilities of the solidified products. At the sintering condition of 1 h duration time at 1,200 °C, the Cs immobilization ratio was almost 100%, and a relatively high hardness and elastic modulus of 3.50 and 35.38 GPa, respectively, were achieved. The formation of crystals as temperature increased corresponded to the micromechanical properties of the sintered product. Density functional theory calculations revealed that Cs4Al4Si20O48 is orthogonal with cubic unit cells, and Cs–O is more likely to form an ionic bond in the crystal. The dissolution of ceramic matrix was determined to be a temperature-dependent solidification mechanism that involves a corrosion medium. These findings provide a basic technological support for the stabilization of radioactive wastes.

外文关键词：

CesiumDFTFukushimaMicromechanicsSolidification

作者：

Xu L.、Li H.、Sang H.、Mao C.、Wang Y.、Wu Y.

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作者单位：

Department of Nuclear Engineering and Technology School of Energy and Power Engineering Huazhong University of Science and Technology

China Institute of Atomic Energy

School of Nuclear Science and Engineering Shanghai Jiao Tong University

出版年：

2022

DOI：

10.1016/j.jnucmat.2021.153501

Journal of Nuclear Materials

EISCI

ISSN：0022-3115

年,卷(期)：2022.560

参考文献量35