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Mutual effect of Cs(I) and Sr(II) sorption on nano-talc investigated by EXAFS, modeling and theoretical calculations

Abstract

Competitive sorption of Cs(I) and Sr(II) towards nano-talc (a representative magnesium silicate) was investigated by batch, EXAFS, modeling and theoretical calculations. Batch experiments revealed that the decrease extent of Cs(I) sorption at bi-solute was greater than that of Sr(II) sorption, elucidating the preferable sorption of Sr(II) onto nano-talc compared to Cs(I). The high distribution coefficient of Sr(II) was further demonstrated to be more efficient Sr(II) sorption from groundwater and seawater. According to EXAFS technique, the similarity between the adsorbed samples and the aqueous references in the bi-solute indicated outer-sphere complexation of Sr(II)/Cs(I) onto nano-talc. However, polarized EXAFS analysis indicated that formation of Sr inner-sphere mononuclear and bidentate surface complexes located at the edges of nano-talc platelets due to the angular dependence of Sr-Si contributions. Diffuse layer model gave satisfactorily fits to Cs(I) and Sr(II) sorption onto nano-talc at bi- and single-solute. The high sorption energy and short bond distances, obtained using theoretical calculations, suggested the favorable sorption of Sr(II) onto nano-talc compared to Cs(I). The findings revealed the mutual effect of radionuclides in the subsurface environments, which is of great importance for in-depth understanding of transportation and fate of radionuclides at water-mineral interface and for evaluating the potential risk of radionuclides in geological disposal.

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Publication details

The article was received on 21 Nov 2018, accepted on 11 Jan 2019 and first published on 11 Jan 2019


Article type: Paper
DOI: 10.1039/C8EN01313F
Citation: Environ. Sci.: Nano, 2019, Accepted Manuscript
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    Mutual effect of Cs(I) and Sr(II) sorption on nano-talc investigated by EXAFS, modeling and theoretical calculations

    Y. Sun, W. Song, Y. Liu, T. Hayat, A. Alsaedi, Y. Ai, V. K. Sharma and X. Wang, Environ. Sci.: Nano, 2019, Accepted Manuscript , DOI: 10.1039/C8EN01313F

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