Sorption of Sr and Cs onto Czech natural bentonite: experiments and modelling

Baborová, Lucie; Vopálka, D.; Červinka, Radek

doi:10.1007/s10967-018-6196-3

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…Batch experiments at different salt (e.g., NaCl, , NaNO 3 , NaClO 4 , and CaCl 2 ,, ) concentrations have been performed to evaluate the competitive adsorption of Sr 2+ . Water ionic strength was found to have a strong effect on Sr adsorption; however, for experiments conducted in Na salt solutions, this was solely due to the competition between single background ions in those solutions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Desorption Behaviors of Sr on Montmorillonite: A Triple Sr Isotope Perspective

Liu

Hsieh

Chen

et al. 2022

ACS Earth Space Chem.

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Montmorillonite is a widespread mineral, which affects the migration of Sr in the critical zone. Hydrochemical factors influencing Sr adsorption have been evaluated in the literature through laboratory batch experiments. Since those experiments were conducted using high-concentration and high-purity standard solutions, the influences of chemical matrices or element relative concentrations in water remain unclear. Here, we reassessed the adsorption and desorption behaviors of Sr on montmorillonite using natural waters with various chemical matrices and ionic strengths. Triple Sr isotopes ( 87 Sr/ 86 Sr and δ 88/86 Sr) were used to trace the exchange processes between the minerals and the waters. Adsorption and desorption occurred in all processed samples, but to varying degrees. These phenomena (especially desorption) were principally controlled by the ionic competition of divalent ions (i.e., Ca and Mg), rather than by ionic strength. Sr isotope fractionation occurred during adsorption. Isotopically lighter Sr was preferentially adsorbed: the mean Δ 88/86 Sr mineral−water (a value independent from the clay type) was −0.17‰. Consequently, water δ 88/86 Sr depended on both the mixing of mineral-bound and initial water Sr and on the degree of Sr adsorption; moreover, the exchange process was a reversible reaction and reached its chemical and isotopic equilibrium within a short time.

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Section: Introductionmentioning

confidence: 99%

Adsorption and Desorption Behaviors of Sr on Montmorillonite: A Triple Sr Isotope Perspective

Liu

Hsieh

Chen

et al. 2022

ACS Earth Space Chem.

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“…The structural layers of montmorillonite have overlaps without definite periodicity in the direction of plane axes, a and b. A monoclinal structure is formed with the parameters of elementary cell depending on the hydration degree and chemical composition of the interlayer space [9].…”

Section: Methodsmentioning

confidence: 99%

Sorption Material Based on Modified Bentonite for Water Filtering Systems

Atamanova¹,

Koshelev²,

Тихомирова³

et al. 2019

Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" Dedicated to the

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Adsorption methods are among the most promising water treatment approaches of today. Application of clay materials as sorption agents for surface and waste water treatment are of particular interest. The object of current study is bentonite mainly containing montmorillonite. The micro-and meso-porosity of bentonite can be increased by introduction of pillars into the interlayer structure of aluminosilicates. The work describes a technology for bentonite gel production by modification of bentonite by glycerol. The elemental composition of bentonite was investigated by electronic microscopy of the specimen surface. The analysis of electronic microphotograps of the side face and side surface of the granules of annealed modified bentonite specimen and results of electronic microscopy have shown that bentonite granules during annealing are modified by pyrolysis carbon produced after decomposition of glycerol in oxygen-free atmosphere. It was established that bentonite modified by glycerol has four times larger specific surface area as compared with nonmodified bentonite.

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“…Their excellent adsorption and ion exchange properties as well as their selectivity towards several cations especially for radionuclides such as 137 Cs, 152 Eu, 60 Co etc. have received great attention in environmental technology [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The effect of irradiation on the Cs, Co and Eu-removal from aqueous solutions using Greek minerals

Dianellou

Karantoumanis

Tsamos

et al. 2023

J Radioanal Nucl Chem

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Sorption properties of Greek bentonites and zeolites were investigated in raw form and after irradiation for removal of Cs, Co and Eu from aqueous solutions using 137Cs, 60Co and 152Eu as tracers and γ-spectroscopy. The sorption experiments were undertaken under different conditions (pH, concentration, competitive ions and temperature). The structural changes of the sorbents due to irradiation and metal sorption were examined through XRD, FTIR and SEM/EDS. Sorption isotherms were reproduced by mathematical models and thermodynamic parameters were derived. The results showed that the sorption capacity was slightly affected by irradiation. The environmental compatibility tests proved the safe disposal of the investigated materials.

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Sorption of Sr and Cs onto Czech natural bentonite: experiments and modelling

Cited by 15 publications

References 29 publications

Adsorption and Desorption Behaviors of Sr on Montmorillonite: A Triple Sr Isotope Perspective

Adsorption and Desorption Behaviors of Sr on Montmorillonite: A Triple Sr Isotope Perspective

Sorption Material Based on Modified Bentonite for Water Filtering Systems

The effect of irradiation on the Cs, Co and Eu-removal from aqueous solutions using Greek minerals

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