An Investigation of Increase of Sorption of Strontium with the Exchange of Lithium on Montmorillonite

Abstract

Sorption of Sr2+ ions on Na-montmorillonite was carried out in Sr2+ ions and in binary solutions of Sr2+ and Li+ ions at 220 °C for 24 h under hydrothermal condition. Sorption of Sr2+ ions was found to be substantially increased by the assistance of Li+ ions. FT-IR spectra revealed that migration of Li+ ions in the hexagonal hole of montmorillonite and subsequent exchange with Sr2+ ions affected OH-stretching bands caused an increase of Sr-sorption.

Sorption mechanism and prediction of sorbents' behaviour in physicochemical systems

“…Thus, the sorption of strontium from a hydrothermal solution by Montmorillonite increases by 30% if the Sr 2+ ions sorb together with Li + ions. 195 An analogous positive cosorption of these elements by soils was described by Chitra et al 196 The adsorption of carbon monoxide on SiO 2 from a gaseous phase is negligible under ordinary conditions if the sorbent is not doped with a silver salt. The adsorption is enhanced if the sorbent contains silver.…”

Evaluating Solid Sorbents for Recycling Wash Waters Containing Strontium and Calcium

“…Of the soils, a loam from the Tohoku District of Japan had a K d value of 5.62 × 10 2 mL/g (Yanagi et al 1989). Of the magnetite, sand, and loess tested, K d values were significantly less when compared to the other natural clays and minerals, indicating that their K d values were at least one order of magnitude lower and ultimately insignificant (Yanagi et al 1989;Missana et al 2008;Adeleye et al 1994;Bors et al 1997;Dutta et al 1999;Ebner et al 2001;Rod et al 2010;Huo et al 2013;Rhodes 1957;Galamboš et al 2013;Van Loon et al 2005;Chirkst et al 2003;Rajec et al 1998;Akyüz et al 2000;Bellenger and Staunton 2008;Chiang et al 2010;Apak et al 1996). The last four sorbents were in solutions that did not contain any competing cations.…”

“…When in 0.002-0.2 M of sodium, the FEBEX bentonite yielded the greatest K d value, as high as 5.62 × 10 5 mL/g at the lowest sodium concentration (Missana et al 2008), exceeding the K d value of any other clay, including kaolin, illite, and vermiculite (Missana et al 2008;Adeleye et al 1994;Bellenger and Staunton 2008;Bors et al 1997). Camontmorillonite in a solution with no competing cations and Na-montmorillonite in 0.01-0.015 M of Li + had a K d of 600 mL/g and up to 1.0 × 10 3 mL/g, respectively (Adeleye et al 1994;Dutta et al 1999). Na-kaolinite in a solution with no competing cations had a K d of 1.3 × 10 3 mL/g, and Na-mica, which was in a solution with calcium as the highest competing cation at 7.27 × 10 −4 M, had a maximum of 2.4 × 10 5 mL/g (Adeleye et al 1994;Sylvester and Clearfield 1998).…”