Abstract
The oxygen concentration and inherent Fe in bentonite have a significant influence on the Se(IV) sorption process. In this study, the sorption of selenite on natural bentonite was investigated using a batch experiment method, and the distribution coefficient (K d) values were obtained in the pH range from 2.0 to 10.0 under oxic/anoxic conditions. The K d values always reached a maximum value at a pH of 4 under oxic conditions and at a pH of 8 under anoxic conditions; meanwhile, the K d value under anoxic conditions was larger than the value under oxic conditions, especially in regard to the maximum K d values. The oxygen conditions have a significant influence on the ratio of redox-sensitive Fe2+/Fe3+, which was closely related to the difference in the K d values under both oxic/anoxic conditions. Ferric selenite and green rust could be responsible for the maximum K d values under oxic/anoxic conditions. In the leaching experiments, we found that the Fe2+ in bentonite could replace Mg2+ and Al3+ in the octahedral sheet. Spectroscopy methods, such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) were used to characterize the surface properties of the samples after reaction. Overall, this study shows that the addition of Fe2+-containing materials into backfill/buffer materials under anoxic condition could enhance the sorption of 79Se(IV).
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Acknowledgments
This work was supported by the Special Foundation for High-level Radioactive Waste Disposal (2007-840, 2012-851) and the National Natural Science Foundation of China (U1530112, 11475008, 11075006, 91026010). In addition, we are grateful to Prof. Xiangyun Wang for drawing the Eh-pH diagram of Se and Fe, and to the Beijing Synchrotron Radiation Facility for providing beam time.
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He, J., Qiao, X., Shi, Y. et al. Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite. Sci. China Chem. 60, 1258–1264 (2017). https://doi.org/10.1007/s11426-017-9091-4
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DOI: https://doi.org/10.1007/s11426-017-9091-4