Sorption behavior of cesium ions to Mg-containing calcium silicate hydrate in a co-precipitation process

IF 0.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY MRS Advances Pub Date : 2024-01-05 DOI:10.1557/s43580-023-00757-1

Tsugumi Seki, Ryota Oasa, Taiji Chida, Y. Niibori

引用次数: 0

Abstract

The sorption behavior of Cs to Mg-containing calcium silicate hydrate (C–S–H) was examined to consider C–S–H formation under the water-saturated conditions around a radioactive waste repository. The amount of Cs sorption was slightly lower for Mg-containing C–S–H than for C–S–H, because Mg leads to a decrease in sorption sites by facilitating the polymerization of silicate chains. However, the apparent sorption distribution coefficient Kd of Cs on C–S–H with a Ca/Si molar ratio of 0.8 and Mg contents up to 20% was estimated to be 3.4–6.1 mL/g. Furthermore, the amount of Cs sorption was not decreased by the presence of Ba. The apparent Kd obtained in this study was about 10 times higher than that conventionally estimated for host rocks in the plutonic repository, indicating that C–S–H retains the effect of Cs immobilization even when it contains Mg. Graphical abstract

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

共沉淀过程中铯离子对含镁硅酸钙水合物的吸附行为

研究了铯对含镁硅酸钙水合物（C-S-H）的吸附行为，以考虑放射性废物库周围水饱和条件下 C-S-H 的形成。含镁 C-S-H 的铯吸附量略低于 C-S-H，这是因为镁促进了硅酸盐链的聚合，导致吸附位点减少。不过，在 Ca/Si 摩尔比为 0.8、镁含量高达 20% 的 C-S-H 上，铯的表观吸附分布系数 Kd 估计为 3.4-6.1 mL/g。此外，钡的存在也不会减少铯的吸附量。本研究中获得的表观 Kd 比传统上对深成岩储库中的主岩估计的 Kd 高约 10 倍，这表明 C-S-H 即使含有镁也能保持铯的固定效果。图表摘要

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊