Abstract
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 Sr2+ ions could be observed. Although the zeolite phases in GZAC were completely destroyed at 800 °C, the CLF of Sr2+ ions from the GZAC still meet Chinese National Standard (GB14569.1-2011). At 1000 °C, the CLF of Sr2+ 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.
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Acknowledgements
This work was supported by the Natural Science Foundation of China (No. 51404200) and the research fund from Southwest University of Science and Technology (Nos. 14tdgk04, 17lzx618, 18lzx654).
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Li, Y., Peng, X., Jiang, X. et al. Influence of freeze-thaw cycles and high temperature exposure on immobilization performance of geopolymer-zeolite A composites for strontium radionuclide. J Radioanal Nucl Chem 327, 1037–1043 (2021). https://doi.org/10.1007/s10967-020-07574-y
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DOI: https://doi.org/10.1007/s10967-020-07574-y