Strontium binding by calcium silicate hydrates

Journal of Colloid and Interface Science
Jan TitsM H Bradbury

Abstract

In the present study the binding of strontium with pure calcium silicate hydrates (C-S-H) has been investigated using batch-type experiments. Synthetic C-S-H phases with varying CaO:SiO(2) (C:S) mol ratios, relevant to non-degraded and degraded hardened cement paste, were prepared in the absence of alkalis (Na(I), K(I)) and in an alkali-rich artificial cement pore water (ACW). Two types of experimental approaches have been employed, investigating sorption and co-precipitation processes, respectively. The Sr(II) sorption kinetics were determined as well as sorption isotherms, the effect of the solid to liquid ratio and the composition (C:S ratio) of the C-S-H phases. In addition, the reversibility of the Sr(II) sorption was tested. It was shown that both the sorption and co-precipitation tests resulted in Sr(II) distribution ratios which were similar in value, indicating that the same sites are involved in Sr(II) binding. In alkali-free solutions, the Sr(II) uptake by C-S-H phases was described in terms of a Sr(2+)-Ca(2+) ion exchange model. The selectivity coefficient for the Sr(2+)-Ca(2+) exchange was determined to be 1.2+/-0.3.

References

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

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Citations

Aug 22, 2006·Journal of Colloid and Interface Science·M HarfoucheM Tsukamoto
Sep 2, 2011·Environmental Science & Technology·Xavier GaonaErich Wieland
Mar 5, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Adam J FullerIan Terence Burke
Nov 26, 2009·Journal of Colloid and Interface Science·P MandalievE Wieland
Oct 30, 2015·Environmental Science & Technology·Lucile DezeraldAndrés Saúl
Mar 15, 2006·Waste Management·Barbara Lothenbach, Erich Wieland
Nov 20, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Jan TitsErich Wieland
Jul 23, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Xinyuan KeJohn L Provis
Jun 6, 2019·Journal of Materials Science. Materials in Medicine·Tsui-Hsien HuangChia-Che Ho
Nov 11, 2020·Environmental Science and Pollution Research International·Michael D KaminskiMatthew Magnuson
Dec 9, 2020·Journal of Environmental Management·E PhillipR O Abdel Rahman
Feb 21, 2008·Environmental Science & Technology·Erich WielandRainer Dähn

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