Sorption of Cs, Sr, U, and Pu radionuclides on natural and modified clays

Mulyutin, V. V.; Gelis, V. M.; Некрасова, Н. А.; Kononenko, O. A.; Vezentsev, A. I.; Volovicheva, N. A.; Korolkova, Svetlana V.

doi:10.1134/s1066362212010110

Cited by 24 publications

(6 citation statements)

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“…Therefore, the net electrostatic force of attraction between Cs(I) and the negatively charged bentonite surface is expected to be more as compared to that of Sr(II). This may lead to enhanced sorption of Cs(I) as compared to Sr(II reported elsewhere during the sorption of Sr(II) and Cs(I) on smectite rich clay [21][22][23][24][25]. Apparently, this observation suggests that the bentonite clay used in this work has smaller gaps between two layers and which may hinder the sorption of Sr(II).…”

Section: Sorption Of Different Metal Ions On Bentonitementioning

confidence: 56%

Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions

2014

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Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anionsAbstract: Batch sorption experiments have been carried out to understand the interaction of different metal cations such as Am(III), Eu(III), Sr(II), and Cs(I) with bentonite clay at varying pH (1-9). The effects of other experimental parameters such as ionic strength (0.01-1 M (NaClO 4 )), clay to metal ion concentration ratio, and the presence of complexing anions such as oxalic acid (ox), carbonate (CO 3 2− ), ethylenediaminetetraacetic acid (EDTA), and humic acid (HA) on Eu(III) sorption have also been investigated. The sorption of Eu(III) has been found to be invariant with the change in ionic strength suggesting innersphere complexation on the bentonite surface. Near quantitative sorption of Eu(III) and Am(III) has been observed in the entire pH range and there is marginal influence of the presence of 1 × 10 −4 M of ox and CO 3 2− on the sorption profile. However, the presence of 1 × 10 −4 M EDTA suppresses the sorption of Eu(III) ion onto bentonite. Desorption studies of Eu(III) loaded onto bentonite using varying concentrations of HClO 4 (0.01-1.0 M) solutions re-veal that higher acidity favors the process. The sorption of Eu(III) on bentonite followed the Langmuir isotherm suggesting monolayer sorption process. The data fitting to D-R isotherm suggested that the Eu(III) sorption on bentonite follows ion exchange mechanism. The sorption capacity of bentonite clay was determined to be 3.8(±0.1) × 10 −4 moles/g using Langmuir and D-R isotherms.

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Section: Sorption Of Different Metal Ions On Bentonitementioning

confidence: 56%

Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions

2014

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“…fractional crystallization, solvent extraction, ion exchange using inorganic and organic ion exchangers have been developed for removal of radionuclides from liquid radioactive wastes. The most widely used methods for water treatment to remove radionuclides (Cs, Sr, U, Pu) are those based on co-precipitation and sorption (MILYUTIN et al, 2012). Many researchers have reported about utilization of zeolite and bentonite type minerals for removal of Cs + ions (YILDIZ et al, 2011;ABD EL-RAHMAN et al, 2006;ATUN and BODUR, 2002).…”

Section: Introductionmentioning

confidence: 98%

Radiocesium Adsorption By Zeolitic Materials Synthesized From Coal Fly Ash

Remenárová¹,

Pipíška²,

Florková³

et al. 2014

Nova Biotechnologica Et Chimica

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Brown coal fly ash derived from the combustion of brown-coal in power plant ENO Nováky (Slovak Republic) was used as raw material for synthesis of zeolitic materials ZM1 and ZM3 by hydrothermal alternation with 1M NaOH and 3M NaOH, respectively. Fly ash and synthesized products were characterized using XRF and SEM-EDX analysis. Subsequently, zeolitic materials were tested as sorbents to remove Cs + ions from aqueous solutions using radiotracer technique. Sorption of cesium by both types of zeolitic materials obeys Langmuir adsorption isotherm model. The maximum sorption capacities Q max at pH 6.0 calculated from Langmuir isotherm were 1203 ± 65 μmol Cs + / g for ZM1 and 1341 ± 66 μmol Cs + / g for ZM3. The results showed that alkali treated fly ash can be used as effective sorbent for radiocesium removal from contaminated solutions.

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“…Materials with higher K d values can actually be used as a barrier preventing escape of disposed radionuclides. For example, clay minerals added during cementation of liquid RW are known to reduce the cesium leaching rate by more than 5 times (Milyutin et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Migration Radiological Equivalence for Dual Component Nuclear Waste in a Deep Geological Repository

Иванов

Спирин²,

Menyajlo

et al. 2021

Health Physics

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The paper is concerned with the issue of achieving the radiological equivalence (the equivalence of radiation risks) of radioactive waste of nuclear reactors and corresponding mass of natural uranium, taking into account the different migration ability of radionuclides in geological formations and soil. This migration radiological equivalence is being investigated for the deep burial of radioactive waste in the case of the development of a two-component nuclear power system with the concurrent use of thermal neutron reactors and fast neutron reactors. Calculations were performed of radiation doses and radiation risks of cancer death arising from consumption of drinking water from a well above a disposal site. The radiation risk relating to a two-component nuclear power system is lower than that from natural uranium; i.e., after reaching the radiological equivalence (100 y of storage) over the timescale of 109 y, the principle of migration radiological equivalence is satisfied. It would take 106 y after radioactive waste disposal to reach the migration radiological equivalence if only thermal reactors were operated. As regards consumption of well drinking water, the radiation risk does not exceed 10−5 y−1 for a two-component nuclear power system, while being 10−3 y−1 (socially unacceptable level) for a power system using only thermal reactors. Radionuclides 241Am, 239Pu, and 240Pu in drinking water make the main contribution to the doses and radiation risks of people for 104 y after the disposal of radioactive waste.

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Sorption of Cs, Sr, U, and Pu radionuclides on natural and modified clays

Cited by 24 publications

References 1 publication

Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions

Sorption of metal cations on suspended bentonite: effects of pH, ionic strength and complexing anions

Radiocesium Adsorption By Zeolitic Materials Synthesized From Coal Fly Ash

Evaluation of Migration Radiological Equivalence for Dual Component Nuclear Waste in a Deep Geological Repository

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