This study is devoted to studying the sorption of 137Cs on mineral sorbents at a wide pH range, from 2 to 10, as well as to studying sorption mechanisms. In order to obtain the most reliable sorption characteristics, samples of high purity were examined as sorbents: bentonite, glauconite, zeolite, and diatomite. A detailed description of their mineral composition, cation exchange capacity and specific surface of sorbents is given. XRD, XRF, FTIR, SEM, and BET adsorption methods were used for assaying. The sorption and desorption values were identified for each sorbent. As a result of the conducted research, it can be concluded that 137Cs sorption mainly occurs through the exchange reaction on zeolite, glauconite and bentonite. The highest cesium Kd was observed on zeolite due to its high CEC and amounted to 4.05 mg/L at pH 7. The higher sorption capacity of glauconite in comparison with bentonite is primarily due to the high layer charge which is mainly localized in tetrahedral sheets, and to the existence of highly selective sorption sites (frayed edge sites) on the glauconite surface. Diatomite showed the lowest sorption capacity provided by the presence of a small quantity of smectite and kaolinite in its composition. The values of desorption increase in the following order: zeolite < bentonite ~ diatomite < glauconite.

Glauconite

Bentonite

Cation-exchange capacity

10.3390/min9100625

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Citations (71)

Globular layer silicates of the glauconite–illite composition in Upper Proterozoic and Lower Cambrian rocks

Lithology and Mineral Resources (2015)

Т. А. Ivanovskaya Bella B. Zviagina B. A. Sakharov Т. S. Zaitseva E. V. Pokrovskaya

Riphean

Glauconite

Illite

10.1134/s002449021506005x

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Citations (17)

Structural and Crystal-Chemical Features and Rb–Sr Age of Globular Glauconite in the Ust-Il’ya Formation (Lower Riphean, Anabar Uplift)

Lithology and Mineral Resources (2020)

Т. S. Zaitseva Т. А. Ivanovskaya B. A. Sakharov Bella B. Zviagina O. V. Dorzhieva

Glauconite

Riphean

Structural formula

Massif

10.1134/s0024490220060103

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Citations (4)

The influence of acid modification on the structure of montmorillonites and surface properties of bentonites

Applied Clay Science (2019)

V. V. Krupskaya L. A. Novikova Ekaterina Tyupina P. E. Belousov O. V. Dorzhieva

Nitric acid

10.1016/j.clay.2019.02.001

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Citations (78)

Determination of the phase composition of partially dehydroxylated kaolinites by modelling their X-ray diffraction patterns

Clay Minerals (2019)

Victor A. Drits B. A. Sakharov O. V. Dorzhieva Bella B. Zviagina Holger Lindgreen

Abstract Modelling of experimental X-ray diffraction (XRD) patterns is used to determine the phase composition of partially dehydroxylated kaolinite samples. To identify unambiguously the presence of two or three phases in the heated kaolinite samples, the full range of their XRD patterns has to be analysed. Two different kaolinites, from Imerys (UK) and from Georgia (USA; KGa-2 1 ), were studied. The heating temperatures were selected to cover the entire range of dehydroxylation for both kaolinites (400–550°C for Imerys and 400–495°C for KGa-2 1 ). Two different dehydroxylation pathways were observed. At each stage of partial dehydroxylation, the kaolinite from Imerys consisted of the original, non-dehydroxylated kaolinite and of a fully dehydroxylated phase, metakaolinite. During partial dehydroxylation of kaolinite KGa-2 1 , each product formed at a given heating temperature consisted of three phases: the original kaolinite; a dehydroxylated phase, metakaolinite; and a phase with diffraction features corresponding to a defective kaolinite-like structure. To determine the content of metakaolinite in a partially dehydroxylated specimen, its experimental XRD pattern was reproduced by the optimal summation of the diffraction patterns of the initial kaolinite and metakaolinite. A procedure that reveals the basic diffraction features of the third phase is suggested. The XRD patterns and thus the structures of the metakaolinites formed after dehydroxylation of the Imerys and KGa-2 1 samples differ substantially. The conventional determination of the initial kaolinite and metakaolinite contents in partially dehydroxylated kaolinite based on the analysis of basal reflections and weight losses may lead to overlooking the formation of the intermediate phases.

10.1180/clm.2019.39

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Citations (7)

Transformation of Structure and Adsorption Properties of Montmorillonite under Thermochemical Treatment

Geochemistry International (2019)

V. V. Krupskaya Sergey Zakusin Ekaterina Tyupina O. V. Dorzhieva М. С. Чернов

Bentonite

Cation-exchange capacity

10.1134/s0016702919030066

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Citations (29)

“Rejuvenated” Globular Phyllosilicates in the Riphean Deposits of the Olenek Uplift (North Siberia): Structural Identification and Geological Significance of Rb–Sr and K–Ar Age Data