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Diffusion behavior of Re(VII) in compacted illite-, hematite- and limonite-montmorillonite mixtures

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Abstract

A through-diffusion method was used to investigate the Re(VII) (as a surrogate to 99Tc(VII)) diffusion in compacted illite-, hematite- and limonite-montmorillonite mixtures. The effective diffusion coefficient D e values were in the range of (4.29–6.71) × 10−11 m2/s at pH 3.0 and (3.44–5.72) × 10−11 m2/s at pH 9.0, respectively. Compared to montmorillonite, both D e and α values enhanced at least three-folds in montmorillonite mixtures, indicating that the impurities changed the diffusion path. Interestingly, the K d values of (0.63–3.94) × 10−4 kg/m3 were found in montmorillonite mixtures. However, the change of D a value was less than two-folds, indicating that the illitization and iron corrosion of a back-fill material had no obvious influence on Re(VII) diffusion velocity.

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Acknowledgements

This work was supported by Zhejiang Provincial National Science Foundation of China (Y15B070018) and the National Natural Science Foundation of China (Grant No. 21207035).

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Correspondence to Tao Wu.

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Wang, Z., Zhang, J., Chen, J. et al. Diffusion behavior of Re(VII) in compacted illite-, hematite- and limonite-montmorillonite mixtures. J Radioanal Nucl Chem 311, 655–661 (2017). https://doi.org/10.1007/s10967-016-5092-y

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  • DOI: https://doi.org/10.1007/s10967-016-5092-y

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