Caesium selectivity and fixation by vermiculite in the presence of various competing cations

Sikalidis, C.; Μisaelides, P.; Alexiades, C. A.

doi:10.1016/0269-7491(88)90108-x

Cited by 30 publications

(16 citation statements)

References 14 publications

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“…Given that Si and Al precipitates were more readily dissolved ( Fig. 1-2), these results suggest that strong Cs binding to illite FES and the vermiculite interlayer (Sikalidis et al, 1988) persists even after 1 y reaction time in the caustic conditions representative of tank waste solutions at the Hanford site. Although it is plausible that Cs adsorption to the vermiculite siloxane surface induced partial interlayer collapse, resulting in subsequent diffusion limited uptake, basal (d-001) spacings measured by X-ray diffraction (Choi et al, 2005) were slightly increased over the reaction time, consistent with concurrent uptake of both Cs and hydrated Sr.…”

Section: Contaminant Sequestrationmentioning

confidence: 84%

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Choi

Amistadi

Chorover

2005

Geochimica et Cosmochimica Acta

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Section: Contaminant Sequestrationmentioning

confidence: 84%

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Choi

Amistadi

Chorover

2005

Geochimica et Cosmochimica Acta

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“…Variation of the concentration of radionuclides on the soil surface depends mainly on its mineralogical composition, its chemical and physical properties, meteorological conditions, and the possible transfer of material to deeper soil layers (Missaelidis et al 1987;Vosniakos et al 1998). The possibility of fixation of Cs isotopes by geological material and soil has been the subject of previous studies (Sikalidis et al 1988). The mechanism of fixation depends strongly on the mineral composition of the soil.…”

Section: Time Trendsmentioning

confidence: 99%

Radionuclide Uptake from Soil to Plants: Influence of Soil Classification

Mollah

2014

Radionuclide Contamination and Remediation Through Plants

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The entry of trace contaminants, which are present in the terrestrial environment, into human food chains is controlled in the long term by their uptake by plant roots. The radionuclides released into the environment can give rise to human exposure by the transport through the atmosphere, through aquatic systems, or through soil subcompartments. Soil-to-plant factor is one of the important parameters to be used in transfer models for predicting the concentration of radionuclides in crops/plants and for estimating dose impacts to man. Existing databases are limited to experimental values in a restricted number of soil systems and are largely comprised of temperate environment data. In general, transfer factors show a large degree of variation dependent upon several factors such as soil type, species of plants, and other environmental conditions. Soil-to-plant transfers of the radionuclides varied considerably with the times of deposition also. In general, the variations with the deposition times were by a factor of up to 10. This chapter describes a review of published data on the transfer factor (TF) and classification of soils based on TFs.

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“…Cs ions are fixed between the layers by the negative charge. As a result, it is difficult to desorb all Cs ions adsorbed by 2:1 type clay minerals, even if using the high concentration of acid which can collapse the structure of clay minerals [4].…”

Section: B Properties Of Clay Mineralsmentioning

confidence: 99%

Study on Decontamination of Contaminated Soils by Magnetic Separation

Sekiya

Kuwahara

Yoshida

et al. 2014

IEEE Trans. Appl. Supercond.

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In this paper, we examined a new method for decontamination of soils by magnetic separation to reduce the volume of contaminated soils. In this method, we separate paramagnetic 2:1 type clay minerals with strong adsorbility of Cs ions from diamagnetic 1:1 type clay minerals with weak adsorbility of Cs ions. In addition, Cs ions desorbed from 1:1 types by washing are migrated to 2:1 type clay minerals. As a result, the doses of 1:1 type clay minerals can be reduced. First, it became apparent by the particle trajectory simulation that vermiculite, which is 2:1 type clay mineral, could be selectively separated by high gradient magnetic separation using superconducting magnet. Second, we confirmed the separation of vermiculite coexisting with kaolinite, which is 1:1 type clay mineral, by the experiments based on the simulation. Moreover, the experiments using the actual contaminated soils were conducted to examine the migration of Cs ions from 1:1 to 2:1 type clay minerals. As a result, it was observed that Cs ions desorbed from 1:1 types could be adsorbed to 2:1 type clay minerals when using 0.1 mol/L KI as wash solution. It showed the possibility of decreasing the dose of 1:1 type clay minerals.

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Caesium selectivity and fixation by vermiculite in the presence of various competing cations

Cited by 30 publications

References 14 publications

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Radionuclide Uptake from Soil to Plants: Influence of Soil Classification

Study on Decontamination of Contaminated Soils by Magnetic Separation

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