Nickel retention by calcium silicate hydrate phases: Evaluation of the role of the Ca/Si ratio on adsorption and precipitation processes

Missana, Tiziana; Garcı́a-Gutiérrez, Miguel; Alonso, Úrsula; Almendros-Ginestà, Oscar

doi:10.1016/j.apgeochem.2022.105197

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…for the same variation of pH (González-Siso et al, 2018;Missana et al, 2022). In a recent study, Missana and co-workers reported R d, 63 Ni ≈ 1 m 3 •kg -1 (i.e.…”

Section: Resultsmentioning

confidence: 92%

Uptake of Ni(II), Eu(III) and Pu(III/IV) by Hardened Cement Paste in the Presence of Proxy Ligands for the Degradation of Polyacrylonitrile

Szabó

Tasi²,

Gaona³

et al. 2023

Front. Nucl. Eng.

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The uptake of 63Ni(II), 152Eu(III) and 242Pu(III/IV) by hardened cement paste (HCP, CEM I) in the degradation stage II (pH ≈ 12.5 [Ca] ≈ 0.02 M) was investigated in the absence and presence of α-hydroxyisobutyric, 3-hydroxybutyric and glutaric acids. These organic ligands were previously identified as proxies for the degradation products of UP2W (a polyacrylonitrile-based material used as filter aid in nuclear power plants) under repository conditions. Sorption experiments were conducted with various ligand concentrations (10−4 M ≤ [L]tot ≤ 0.1 M) and solid-to-liquid ratios (0.5 g⋅dm–3 ≤ S:L ≤ 20 g⋅dm–3). Redox conditions in the Pu systems were buffered with either hydroquinone (HQ, pe + pH ≈ 10) or Sn(II) (pe + pH ≈ 2). Strong sorption is observed for 152Eu(III) and 242Pu(III/IV) in the absence of proxy ligands, with distribution coefficients (log Rd ≈ 2.2–4, with Rd in m3⋅kg–1) in line with data reported in the literature. No differences are observed for sorption experiments with Pu in HQ and Sn(II) systems. Lower Rd values are determined for 63Ni(II) (log Rd,Ni63 ≈ 0-1), consistently with previous studies. In combination with log Rd,Ni determined on the basis of the concentration of stable Ni(II) in pristine HCP and in cement porewater, values of the partition coefficient (α) close to 1 are determined. This suggests that the uptake of 63Ni is possibly driven by isotopic exchange with the complete species inventory of stable Ni present in pristine HCP, including Ni in solid phases and associated with surfaces, e.g., of C-S-H phases. The presence of proxy ligands has a negligible effect on the uptake of 152Eu(III) up to [L]tot = 0.1 M. A slight decrease in the distribution ratios for 63Ni(II) and 242Pu(III/IV) is observed at [L]tot > 10−2 M, although the effect is less evident in the case of plutonium due to the dispersion of the data and the increase of the detection limits with increasing ligand concentrations. Compared to strongly complexing ligands like isosaccharinic acid or gluconate, the investigated proxy ligands show a minor capacity for radionuclide mobilization in cementitious systems, even at high concentrations.

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“…for the same variation of pH (González-Siso et al, 2018;Missana et al, 2022). In a recent study, Missana and co-workers reported R d, 63 Ni ≈ 1 m 3 •kg -1 (i.e.…”

Section: Resultsmentioning

confidence: 92%

Uptake of Ni(II), Eu(III) and Pu(III/IV) by Hardened Cement Paste in the Presence of Proxy Ligands for the Degradation of Polyacrylonitrile

Szabó

Tasi²,

Gaona³

et al. 2023

Front. Nucl. Eng.

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“…The hydrolysis constants have been reported by Baes and Mesmer [ 146 ], Brown and Ekberg [ 147 ] and Hummel and Thoenen [ 94 ]. The sorption data on C–S–H phases have been reported by L’Hôpital et al [ 113 , 148 ] for Al(III), Missana et al [ 132 ] for Ba(II), Cevirim-Papaioannou et al [ 149 ] for Be(II), Ochs et al [ 150 ] and Missana et al [ 151 ] for Cs(I), Mancini et al [ 144 ] for Fe(II), Mancini et al [ 123 ] for Fe(III), Missana et al [ 152 ] for Ni(II), Pointeau [ 153 ] for Pb(II), Tits et al [ 134 ] and Olmeda et al [ 133 ] for Ra(II), Tits et al [ 135 ] for Sr(II), and Ziegler et al [ 154 ] for Zn(II).…”

Section: Interaction Of Ferrous and Ferric Iron With Cement Phasesmentioning

confidence: 99%

Speciation of iron(II/III) at the iron-cement interface: a review

Wieland

Miron

et al. 2023

Mater Struct

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Steel is used as reinforcement in construction materials and it is also an important component of cement-stabilized waste materials to be disposed of in deep geological repositories for radioactive waste. Steel corrosion releases dissolved Fe(II/III) species that can form corrosion products on the steel surface or interact with cementitious materials at the iron-cement interface. The thermodynamically stable Fe species in the given conditions may diffuse further into the adjacent, porous cement matrix and react with individual cement phases. Thus, the retention of Fe(II/III) by the hydrate assemblage of cement paste is an important process affecting the diffusive transport of the aqueous species into the cementitious materials. The diffusion of aqueous Fe(II/III) species from the steel surface into the adjacent cementitious material coupled with the kinetically controlled formation of iron corrosion products, such as by Fe(II) oxidation, decisively determines the extension of the corrosion front. This review summarises the state-of-the art knowledge on the interaction of ferrous and ferric iron with cement phases based on a literature survey and provides new insights and proper perspectives for future study on interaction systems of iron and cement.

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“…It has been reported that C–S–H phases have a sorption ability for nuclides. Missana et al studied the retention behavior of Cs, Ba, and Ni in C–S–H phases and showed that the apparent distribution coefficient, K d , increases with a lower Ca/Si ratio. − Seki et al also reported that C–S–H phases significantly sorb Cs, Sr, and Eu during its formation. − …”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Changes in Effective Fracture Aperture with Deposition of Calcium Silicate Hydrate on Granite Surface Under Highly Alkaline Saline Conditions Using a Microflow Cell

Seki,

Furiya,

Chida

et al. 2024

ACS EST Water

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In the highly alkaline environment caused by cementitious materials around radioactive repositories, C−S−H phases are expected to form on groundwater flow paths and retard radionuclide migration by clogging the flow paths. This study evaluated the effective fracture aperture of a flow path using a microflow cell under highly alkaline saline conditions. Experiments showed a decrease in the effective fracture aperture with time, even under 600 mM NaCl, due to the deposition of C−S−H gels. Furthermore, a mathematical model was proposed to estimate the apparent elution rate of silicic acid and the apparent formation rate of C−S−H gel with consideration given to the deposition and detachment of C−S−H gels in the flow path. These apparent rate constants increased slightly with the NaCl concentration. This may be due to the replacement of H + on silanol groups with Na + and the formation of Si−O−Na, which has a large ionic length and angle, and promotes the elution of silicic acid and the deposition of C−S−H gels. These suggest the potential for deposition of C−S−H phases and clogging of groundwater flow paths, even under saline conditions.

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Nickel retention by calcium silicate hydrate phases: Evaluation of the role of the Ca/Si ratio on adsorption and precipitation processes

Cited by 10 publications

References 19 publications

Uptake of Ni(II), Eu(III) and Pu(III/IV) by Hardened Cement Paste in the Presence of Proxy Ligands for the Degradation of Polyacrylonitrile

Uptake of Ni(II), Eu(III) and Pu(III/IV) by Hardened Cement Paste in the Presence of Proxy Ligands for the Degradation of Polyacrylonitrile

Speciation of iron(II/III) at the iron-cement interface: a review

Evaluation of the Changes in Effective Fracture Aperture with Deposition of Calcium Silicate Hydrate on Granite Surface Under Highly Alkaline Saline Conditions Using a Microflow Cell

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