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A Thermodynamic Analysis on the Effect of Salinity on Interlayer Space of Na-Montmorillonite

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Abstract

Bentonite is used as one of the materials for engineered barrier systems in a radioactive waste repository. Since the major clay mineral constituent of bentonite is montmorillonite, its physico-chemical properties are important. Basal spacing of water-saturated Na-montmorillonite is reported to decrease with increasing Na-montmorillonite density. This paper presents a thermodynamic model to calculate change in the interlayer space of Na-montmorillonite based on the relative partial molar Gibbs free energy (dG) of interlayer water as contacted with a solution of an arbitrary salinity (NaCl concentration). Directly change in montmorillonite density (?dm) against salinity was calculated by the thermodynamic model. The dG of interlayer water as contacted with a solution of an arbitrary salinity can be calculated by dG = dGH2O+ dGS (dGH2O: relative partial molar Gibbs free energy of interlayer water, dGS: that of water in a solution of an arbitrary salinity). The author previously reported an empirical correlation of dGH2O vs. water content for Na-montmorillonite. The dependence of ?dm on salinity was calculated by replacing dGH2O in the empirical correlation with dG. ?dm increased with salinity. Concretely, initially the ?dm-values of 0.5 and 1.0 Mg/m3 increased to 1.05 and 1.16 Mg/m3 under 0.5 m-NaCl, respectively. Interlayer space vs. salinity was estimated based on the measured results of basal spacing vs. ?dm by XRD and the average density of montmorillonite vs. salinity calculated by this model.

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Authors and Affiliations

  1. Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushima-naka, 700-8530, Kita-ku, Okayama-shi, Okayama, Japan

    Haruo Sato

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  1. Haruo Sato
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Sato, H. A Thermodynamic Analysis on the Effect of Salinity on Interlayer Space of Na-Montmorillonite. MRS Advances 1, 4027–4033 (2016). https://doi.org/10.1557/adv.2017.185

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  • DOI: https://doi.org/10.1557/adv.2017.185

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