Influence of freeze-thaw cycles and high temperature exposure on immobilization performance of geopolymer-zeolite A composites for strontium radionuclide,Journal of Radioanalytical and Nuclear Chemistry

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Influence of freeze-thaw cycles and high temperature exposure on immobilization performance of geopolymer-zeolite A composites for strontium radionuclide
Journal of Radioanalytical and Nuclear Chemistry ( IF 1.6 ) Pub Date : 2021-01-03 , DOI: 10.1007/s10967-020-07574-y
Yu Li , Xi Peng , Xin Jiang , Ran An , Lei Li , Jiayi Li , Han Li , Zhonghui Xu

This work aims to explore the influence of freeze-thaw cycles and high temperature exposure on immobilization performance of geopolymer-zeolite A composites (GZAC) for strontium radionuclide. After 45 freeze-thaw cycles, no visible change in the phase composition, microscopic morphology and cumulative leaching fractions (CLF) of the Sr 2+ ions could be observed. Although the zeolite phases in GZAC were completely destroyed at 800 °C, the CLF of Sr 2+ ions from the GZAC still meet Chinese National Standard (GB14569.1-2011). At 1000 °C, the CLF of Sr 2+ ions decrease distinctly, attributing to the further viscous sintering and obvious reduction in open porosity. Therefore, we could conclude that GZAC presents remarkable thermal stability for radioactive strontium immobilization.

更新日期：2021-01-03

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