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Open AccessArticle

Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite

1
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Science (IGEM RAS), 119017 Moscow, Russia
2
Faculty of Chemistry, Lomonosov Moscow State University (MSU), 119899 Moscow, Russia
3
Faculty of Geology, Lomonosov Moscow State University (MSU), 119899 Moscow, Russia
4
Geological Institute, Russian Academy of Science (GIN RAS), 119017 Moscow, Russia
5
Department of High Energy Chemistry and Radioecology, D. Mendeleev University of Chemical Technology of Russia (MUCTR), 125480 Moscow, Russia
6
Department of Closed Nuclear Fuel Cycle Technology, National Research Nuclear University, 115409 Moscow, Russia
7
Faculty of Soil Science, Lomonosov Moscow State University (MSU), 119899 Moscow, Russia
8
The Nuclear Safety Institute, Russian Academy of Science (IBRAE RAS), 115191 Moscow, Russia
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 625; https://doi.org/10.3390/min9100625
Received: 29 July 2019 / Revised: 8 October 2019 / Accepted: 10 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Mineral Sorbents)
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. View Full-Text
Keywords: cesium; sorption; desorption; mineral sorbents; bentonite; montmorillonite; glauconite; zeolite; diatomite cesium; sorption; desorption; mineral sorbents; bentonite; montmorillonite; glauconite; zeolite; diatomite
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Belousov, P.; Semenkova, A.; Egorova, T.; Romanchuk, A.; Zakusin, S.; Dorzhieva, O.; Tyupina, E.; Izosimova, Y.; Tolpeshta, I.; Chernov, M.; Krupskaya, V. Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomite. Minerals 2019, 9, 625.

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