Uptake of 226Ra in cementitious systems: A complementary solution chemistry and atomistic simulation study

Lange, Steve; Kowalski, Piotr M.; Pšenička, Milan; Klinkenberg, Martina; Rohmen, Stephan; Bosbach, Dirk; Deissmann, Guido

doi:10.1016/j.apgeochem.2018.06.015

Cited by 20 publications

(14 citation statements)

References 60 publications

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“…The interlayer was found to also expose hosting sites for radionuclide uptake. The uptake potential of C-S-H phases has been studied for several radionuclides, such as Zn(II) (Ziegler et al, 2001), U(VI) (Harfouche et al, 2006;Tits et al, 2011), Eu(III) (Pointeau et al, 2001;Schlegel et al, 2004), Sr(II) (Tits et al, 2006a), Ra(II) (Lange et al, 2018;Olmeda et al, 2019;Tits et al, 2006b), Np(IV) (Gaona et al, 2011;Tits et al, 2014), and Nd(III) (Mandaliev et al, 2010a;Mandaliev et al, 2010b).…”

Section: Introductionmentioning

confidence: 99%

Fe(III) uptake by calcium silicate hydrates

Mancini

Wieland

Geng

et al. 2020

Applied Geochemistry

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Section: Introductionmentioning

confidence: 99%

Fe(III) uptake by calcium silicate hydrates

Mancini

Wieland

Geng

et al. 2020

Applied Geochemistry

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“…One of the most important topics is the retention of radionuclides by these phases. We performed an experimental investigations of the phases present in hardened cement paste to investigate the uptake of Ra by single cement hydration phases [40]. The selected results are given in Fig.…”

Section: Retention Of Ra and Sr By Cementitious Materialsmentioning

confidence: 99%

“…5. In order to understand this difference we have computed enthalpies and free energies of the relevant cation exchange reaction (see Lange et al [40] for details on the computational procedure). The results for C-S-H with Ca/Si=0.9 are reported in Table 3.…”

Section: Retention Of Ra and Sr By Cementitious Materialsmentioning

confidence: 99%

“…The measured Kc values for the Ra and Sr uptake by C-S-H phases as a function of Ca/ Si ratio. Data from Lange et al[40] (Ra: black circles) and Tits et al[41,42] (Ra: black squares; Sr: green triangles). The dashed lines are shown to visualize the trends.…”

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confidence: 99%

“…The computed cation exchange reaction enthapies and free energies for incorporation of Ra and Sr into C-S-H phase with Ca/Si ratio =0.9. Data for Ra from Lange et al[40].…”

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confidence: 99%

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Modeling of Nuclear Waste Forms: State-of-the-Art and Perspectives

et al. 2020

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Computational modeling is an important aspect of the research on nuclear waste materials. In particular, atomistic simulations, when used complementary to experimental efforts, contribute to the scientific basis of safety case for nuclear waste repositories. Here we discuss the state-of-the-art and perspectives of atomistic modeling for nuclear waste management on a few cases of successful synergy of atomistic simulations and experiments. In particular, we discuss here: (1) the potential of atomistic simulations to investigate the uranium oxidation state in mixed-valence uranium oxides and (2) the ability of cementitious barrier materials to retain radionuclides such as 226Ra and 90Sr, and of studtite/metastudtite secondary peroxide phases to incorporate actinides such as Np and Am. The new contribution we make here is the computation of the incorporation of Sr by C-S-H (calcium silicate hydrate) phases.

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Comparative study of Eu and U sorption on cementitious materials in the presence of organic substances

Burešová

Kittnerová

Drtinová

2023

J Radioanal Nucl Chem

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A comparative study of the sorption behavior of europium, a chemical analogue of trivalent actinides, and uranium was performed on hydrated cement paste (HCP) CEM I and calcium-silicate-hydrates (CSH) phase. Kinetic experiments proved that Eu sorption is faster than that of U depending on the phase ratio L/S and the sorption material, whereas EDTA has no significant effect. Same conclusions can be made for equilibrium experiments with HCP and U while with Eu EDTA clearly influenced the distribution ratio Rd with sorption reduction factor (SRF) below 0.5. Uranium sorption on CSH compared to HCP is higher with SRF above 1.2.

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Uptake of 226Ra in cementitious systems: A complementary solution chemistry and atomistic simulation study

Cited by 20 publications

References 60 publications

Fe(III) uptake by calcium silicate hydrates

Fe(III) uptake by calcium silicate hydrates

Modeling of Nuclear Waste Forms: State-of-the-Art and Perspectives

Comparative study of Eu and U sorption on cementitious materials in the presence of organic substances

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