Potential immobilization of Cs and Sr within perovskite-type CsSr2Ta3O10 ceramic waste forms

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-01-06 DOI:10.1007/s10967-024-09892-x

Yifan Li, Shuang Cao, Qingming Yang, Yuannuo Wang, Jingyang Wang, Caishan Jiao, Meng Zhang, Lei Zhang

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Abstract

The removal of Cs and Sr from high level radioactive waste is very important for ecological protection. However, simultaneous immobilization of Cs and Sr is rarely reported. In this work, a perovskite structure CsSr₂Ta₃O₁₀ was synthesized by molten salt method. CsSr₂Ta₃O₁₀ has good thermal stability up to 900 °C at least. Under the γ irradiation of Co-60, most of the material maintained its structural integrity. CsSr₂Ta₃O₁₀ demonstrates a wide range of pH durability, where Cs is stable in the pH range from 4 to 12 and Sr from 2 to 12. Its frame structure remains stable in the pH range from 2 to 12 and will not be decomposed. Further sintering of CsSr₂Ta₃O₁₀ ceramic waste forms results in a high density of 93% − 95%. Moreover, leaching experiments conclude that the long-term leaching rates of Cs and Sr begin to stabilize after 14 days, reaching the order of 10⁰ and 10⁻³ g·m⁻²·d⁻¹. These results provide a possibility for the simultaneous immobilization of Cs and Sr.

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钙钛矿型CsSr2Ta3O10陶瓷废物形态中Cs和Sr的潜在固定化

从高放废物中去除铯和锶对生态保护具有重要意义。然而，Cs和Sr同时固定的报道很少。本文采用熔盐法合成了钙钛矿结构的CsSr2Ta3O10。CsSr2Ta3O10具有良好的热稳定性，至少可达900℃。在Co-60的γ辐照下，大部分材料保持了结构的完整性。CsSr2Ta3O10表现出广泛的pH耐久性，其中Cs在pH 4 ~ 12范围内稳定，Sr在pH 2 ~ 12范围内稳定。其框架结构在pH值2 ~ 12范围内保持稳定，不会分解。CsSr2Ta3O10陶瓷废料进一步烧结，密度达到93% ~ 95%。此外，浸出实验表明，Cs和Sr的长期浸出速率在14天后开始趋于稳定，分别达到100和10−3 g·m−2·d−1量级。这些结果为同时固定Cs和Sr提供了可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.