EXAFS study of Nd(III) uptake by amorphous calcium silicate hydrates (C-S-H)

Journal of Colloid and Interface Science
Peter MandalievErich Wieland

Abstract

Calcium silicate hydrate (C-S-H) phases control the immobilization of many metal cations in cementitious materials. In this study Nd binding to amorphous C-S-H phases with different Ca/Si (C/S) mol ratios (0.56, 0.87 and 1.54) and Nd loadings (7 and 35mumol/g), and which had been aged up to 270 days, has been investigated using extended X-ray absorption fine structure (EXAFS) spectroscopy. The structural parameters derived from EXAFS were compared with those predicted from bond-valence calculations. The study reveals that Nd may form several species in contact with C-S-H phases. The EXAFS parameters determined in samples after one day of reaction indicate the formation of inner-sphere surface complexes. The Nd-Ca and Nd-Si bond-distances tend to increase with time at both Nd loadings. Changes in the coordination numbers N(Si) and N(Ca) were found to be dependent on the (C/S) ratio. At the lowest C/S ratio the number of neighboring Si atoms tends to increase with time while the number of neighboring Ca atoms tends to increase with time at highest C/S ratio. No clear trend was observed for the medium C/S ratio. Nd incorporation into the structures of C-S-H phases is assumed to be the dominant immobilization process based on compa...Continue Reading

References

Jun 13, 2001·Journal of Colloid and Interface Science·Ingmar PointeauFrancine Fromage
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Citations

Jun 9, 2014·The Journal of Chemical Physics·M BauchyR J-M Pellenq
Oct 30, 2015·Environmental Science & Technology·Lucile DezeraldAndrés Saúl
Sep 24, 2013·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Sylvain GrangeonChristophe Chiaberge
Sep 25, 2014·Nature Communications·M J Abdolhosseini QomiR J-M Pellenq
Oct 9, 2019·Expert Review of Vaccines·Stewart Sell

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