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Bentonites from the 10th Khutor deposit (Republic of Khakassia, Russia) are considered a potential buffer material for isolation of radioactive waste in the crystalline rocks of Yeniseyskiy site (Krasnoyarskiy region). This study presents the results of a series of permeameter experiments with bentonite compacted to dry densities of 1.4, 1.6, and 1.8 g/cm3, saturated and permeated by the artificial groundwater from Yeniseyskiy Site. Permeation was conducted at hydraulic gradients of 180–80,000 m/m to simulate potential hydraulic conditions in the early post-closure phase of a deep geological repository (DGR). The respective swelling pressures of 0.8 ± 0.3, 2.2 ± 0.6, and 6.3 ± 0.3 MPa and permeabilities of (27 ± 15) × 10−20, (3.4 ± 0.8) × 10−20, and (0.96 ± 0.26) × 10−20 m2 were observed for the hydraulic gradient of 2000 m/m, which is recommended for the determination of undisturbed swelling pressures and permeabilities in permeameter experiments. Upon incremental increases in the hydraulic gradient, swelling pressures at all densities and permeability at the density of 1.8 g/cm3 remained unchanged, whereas permeabilities at 1.4 and 1.6 g/cm3 decreased overall by a factor of approximately 5 and 1.7, respectively. Seepage-induced consolidation and/or reorganisation of bentonite microstructure are considered possible reasons for these decreases.
Artur Meleshyn; Sergey Zakusin; Victoria Krupskaya. Swelling Pressure and Permeability of Compacted Bentonite from 10th Khutor Deposit (Russia). Minerals 2021, 11, 742 .
AMA StyleArtur Meleshyn, Sergey Zakusin, Victoria Krupskaya. Swelling Pressure and Permeability of Compacted Bentonite from 10th Khutor Deposit (Russia). Minerals. 2021; 11 (7):742.
Chicago/Turabian StyleArtur Meleshyn; Sergey Zakusin; Victoria Krupskaya. 2021. "Swelling Pressure and Permeability of Compacted Bentonite from 10th Khutor Deposit (Russia)." Minerals 11, no. 7: 742.
The sorption of Cu2+ onto bentonite modified with Al Keggin cations and humic acid from CuCl2 solutions at pH 4.5 was studied. Modification of Na-bentonite with Al Keggin cations was found to result in an increase in the basal spacing of montmorillonite from 1.29 nm for N-form to 1.85 and 1.78 nm for HAl13 and Al13 forms respectively, in a reduction of CEC (cation exchange capacity) and in the formation of additional sites with a variable charge with pHPZC 4.2. Al13-bentonite is not affected by heat. Under the conditions of the experiments at pH of 4.5 Na-bentonite adsorbs more Cu2+ from CuCl2 solutions then Al13 forms of bentonites. The main mechanism of copper sorption on Na-bentonite is the cation exchange Cu2+–Na+. The reduction of CEC of Na-bentonite after modification with Al Keggin cations leads to a decrease in the Cu2+ sorption. pH-dependent sorption sites on Al13-bentonites have a pHPZC of 4.2 and, therefore, under conditions of the experiment have positive charge which prevents Cu2+ sorption. Na-bentonite adsorbs more humic acid solution (HA) then Al13-bentonite and the proportion of adsorbed HA remains constant over the entire concentration range. Treatment of the Al13-bentonite with HA leads to the formation of the additional sorption sites. The amount of sorbed Cu2+ and the percentage of their extraction from solutions by HAAl13-bentonite is similar to those values for Na-bentonite.
Yulia Izosimova; Inna Tolpeshta; Irina Gurova; Michail Karpukhin; Sergey Zakusin; Victoria Krupskaya. Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5. Minerals 2020, 10, 1121 .
AMA StyleYulia Izosimova, Inna Tolpeshta, Irina Gurova, Michail Karpukhin, Sergey Zakusin, Victoria Krupskaya. Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5. Minerals. 2020; 10 (12):1121.
Chicago/Turabian StyleYulia Izosimova; Inna Tolpeshta; Irina Gurova; Michail Karpukhin; Sergey Zakusin; Victoria Krupskaya. 2020. "Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5." Minerals 10, no. 12: 1121.
Clay minerals may transform in various systems under the influence of geological, biological, or technogenic processes. The most active to the geological environment are technogenic and biochemical processes that, in a relatively short time, can cause transformation of the rocks’ composition and structure and formation of new minerals, especially clay minerals. Isolation of radioactive waste is a complex technological problem. This work considers the influence of alkaline solutions involved in the radioactive waste (RW) disposal process. In the Russian Federation, due to historical reasons, radioactive waste has accumulated in various types of repositories and temporary storages. All these facilities are included in the federal decommissioning program. Solid radioactive wastes in cement slurries at the landfill site of the Angara Electrolysis Chemical Combine are buried in sandstones and currently suffer the influence of a highly alkaline and highly saline groundwater storage area, which leads to a considerable transformation of the sandstones. This influence results in the formation of peculiar "technogenic” illites that have smectite morphology but illite structure which was confirmed by modeling of X-ray diffraction (XRD) patterns. The described transformations will lead to the increase of porosity and permeability of the sandstones. The research results can be used in assessing the potential contamination of the areas adjacent to the disposal site and in planning the decommissioning measures of this facility.
Victoria Krupskaya; Anatoliy Boguslavskiy; Sergey Zakusin; Olga Shemelina; Mikhail Chernov; Olga Dorzhieva; Ivan Morozov. The Influence of Liquid Low-Radioactive Waste Repositories on the Mineral Composition of Surrounding Soils. Sustainability 2020, 12, 8259 .
AMA StyleVictoria Krupskaya, Anatoliy Boguslavskiy, Sergey Zakusin, Olga Shemelina, Mikhail Chernov, Olga Dorzhieva, Ivan Morozov. The Influence of Liquid Low-Radioactive Waste Repositories on the Mineral Composition of Surrounding Soils. Sustainability. 2020; 12 (19):8259.
Chicago/Turabian StyleVictoria Krupskaya; Anatoliy Boguslavskiy; Sergey Zakusin; Olga Shemelina; Mikhail Chernov; Olga Dorzhieva; Ivan Morozov. 2020. "The Influence of Liquid Low-Radioactive Waste Repositories on the Mineral Composition of Surrounding Soils." Sustainability 12, no. 19: 8259.
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.
Petr Belousov; Anna Semenkova; Tolganay Egorova; Anna Romanchuk; Sergey Zakusin; Olga Dorzhieva; Ekaterina Tyupina; Yulia Izosimova; Inna Tolpeshta; Michail Chernov; Victoria Krupskaya. Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite and Diatomite. Minerals 2019, 9, 625 .
AMA StylePetr Belousov, Anna Semenkova, Tolganay Egorova, Anna Romanchuk, Sergey Zakusin, Olga Dorzhieva, Ekaterina Tyupina, Yulia Izosimova, Inna Tolpeshta, Michail Chernov, Victoria Krupskaya. Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite and Diatomite. Minerals. 2019; 9 (10):625.
Chicago/Turabian StylePetr Belousov; Anna Semenkova; Tolganay Egorova; Anna Romanchuk; Sergey Zakusin; Olga Dorzhieva; Ekaterina Tyupina; Yulia Izosimova; Inna Tolpeshta; Michail Chernov; Victoria Krupskaya. 2019. "Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite and Diatomite." Minerals 9, no. 10: 625.
Complex studies revealed changes in the composition, structure, and properties of bentonite clays from the Taganskoye (Kazakhstan) and Dashkovskoe (Moscow region) deposits due to the thermochemical treatment. The leaching of cations from the interlayer and octahedral positions, protonation of the interlayer and OH-groups, leads to modification of the interlayer and 2:1 layer composition, which in turn contributes to significant changes in properties:-a decrease in the cation exchange capacity due to a decrease in the layer charge and increase in the specific surface due to destruction and partial amorphization. Bentonites from the Dashkovskoye deposit demonstrated higher resistance to thermochemical treatment than the bentonites from the Taganskoye deposit due to the protecting effect of the organic matter. Results of the work showed that even after quite intensive thermochemical treatment (13M HNO3, 90 °C, 5 hours), bentonite clays retain a significant part of the adsorption capacity.
V. V. Krupskaya; S. V. Zakusin; E. A. Tyupina; O. V. Dorzhieva; M. S. Chernov; Ya. V. Bychkova. Transformation of the montmorillonite structure and its adsorption properties due to the thermochemical treatment. Геохимия 2019, 64, 300 -319.
AMA StyleV. V. Krupskaya, S. V. Zakusin, E. A. Tyupina, O. V. Dorzhieva, M. S. Chernov, Ya. V. Bychkova. Transformation of the montmorillonite structure and its adsorption properties due to the thermochemical treatment. Геохимия. 2019; 64 (3):300-319.
Chicago/Turabian StyleV. V. Krupskaya; S. V. Zakusin; E. A. Tyupina; O. V. Dorzhieva; M. S. Chernov; Ya. V. Bychkova. 2019. "Transformation of the montmorillonite structure and its adsorption properties due to the thermochemical treatment." Геохимия 64, no. 3: 300-319.
—Complex studies revealed transformations of composition, structure, and properties of bentonite clays of the Taganskoe (Kazakhstan) and Dahskovskoe (Moscow oblast) deposits under thermochemical treatment. Leaching of cations from interlayer and octahedral sites, protonation of interlayer and OH-groups lead to the modification of interlayer and 2 : 1 layer composition. This, in turn, causes significant changes of properties: a decrease of cation exchange capacity owing to the decrease of layer charge and increase of specific surface through the decomposition and partial amorphization of structure. Bentonites of the Dashkovskoe deposit showed the higher resistance to the thermochemical impact than bentonites of the Taganskoe deposit owing to the isolating action of organic matter. Obtained results demonstrated that bentonite clays preserve most of adsorption properties even under such strong thermochemical influence (13 М HNO3, 90°С, 5 h).
V. V. Krupskaya; S. V. Zakusin; Ekaterina Tyupina; O. V. Dorzhieva; Mikhail Chernov; Ya. V. Bychkova. Transformation of Structure and Adsorption Properties of Montmorillonite under Thermochemical Treatment. Geochemistry International 2019, 57, 314 -330.
AMA StyleV. V. Krupskaya, S. V. Zakusin, Ekaterina Tyupina, O. V. Dorzhieva, Mikhail Chernov, Ya. V. Bychkova. Transformation of Structure and Adsorption Properties of Montmorillonite under Thermochemical Treatment. Geochemistry International. 2019; 57 (3):314-330.
Chicago/Turabian StyleV. V. Krupskaya; S. V. Zakusin; Ekaterina Tyupina; O. V. Dorzhieva; Mikhail Chernov; Ya. V. Bychkova. 2019. "Transformation of Structure and Adsorption Properties of Montmorillonite under Thermochemical Treatment." Geochemistry International 57, no. 3: 314-330.
This paper discusses the mechanism of montmorillonite structural alteration and modification of bentonites’ properties (based on samples from clay deposits Taganskoye, Kazakhstan and Mukhortala, Buriatia) under thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). Treatment conditions were chosen according to those accepted in chemical industry for obtaining acid modified clays as catalysts or sorbents. Also, more intense treatment was carried out to simulate possible influence at the liquid radioactive site repositories. A series of methods was used: XRD, FTIR, ICP-AES, TEM, nitrogen adsorption, and particle size analysis. It allowed revealing certain processes: transformation of montmorillonite structure which appears in the leaching of interlayer and octahedral cations and protonation of the interlayer and –OH groups at octahedral sheets. In turn, changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant alterations in the properties: reduction of cation exchange capacity and an increase of specific surface area. Acid treatment also leads to a redistribution of particle sizes and changes the pore system. The results of the work showed that bentonite clays retain a significant portion of their adsorption properties even after a prolonged and intense thermochemical treatment (1 M HNO3, 60 °C, 108 h).
Victoria V. Krupskaya; Sergey V. Zakusin; Ekaterina A. Tyupina; Olga V. Dorzhieva; Anatoliy P. Zhukhlistov; Petr E. Belousov; Maria N. Timofeeva. Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions. Minerals 2017, 7, 49 .
AMA StyleVictoria V. Krupskaya, Sergey V. Zakusin, Ekaterina A. Tyupina, Olga V. Dorzhieva, Anatoliy P. Zhukhlistov, Petr E. Belousov, Maria N. Timofeeva. Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions. Minerals. 2017; 7 (4):49.
Chicago/Turabian StyleVictoria V. Krupskaya; Sergey V. Zakusin; Ekaterina A. Tyupina; Olga V. Dorzhieva; Anatoliy P. Zhukhlistov; Petr E. Belousov; Maria N. Timofeeva. 2017. "Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions." Minerals 7, no. 4: 49.
The article is dedicated to the study of mineral composition and genesis of Desiatiy Khutor deposit of bentonite clays located in the Republic of Khakasia. The mineral composition of natural samples and fraction Keywords bentonite clay, mineral composition, montomorillonite, 10th Khutor deposit, x-ray diffraction, cation exchange capacity, specific surface area.
Petr Evgenievich Belousov; Viktoria Valerievna Krupskaya; Sergey Viacheslavovich Zakusin; Vasilii Valerievich Zhigarev. BENTONITE CLAYS FROM 10TH KHUTOR DEPOSITE: FEATURES OF GENESIS, COMPOSITION AND ADSORPTION PROPERTIES. RUDN Journal of Engineering Researches 2017, 18, 135 -143.
AMA StylePetr Evgenievich Belousov, Viktoria Valerievna Krupskaya, Sergey Viacheslavovich Zakusin, Vasilii Valerievich Zhigarev. BENTONITE CLAYS FROM 10TH KHUTOR DEPOSITE: FEATURES OF GENESIS, COMPOSITION AND ADSORPTION PROPERTIES. RUDN Journal of Engineering Researches. 2017; 18 (1):135-143.
Chicago/Turabian StylePetr Evgenievich Belousov; Viktoria Valerievna Krupskaya; Sergey Viacheslavovich Zakusin; Vasilii Valerievich Zhigarev. 2017. "BENTONITE CLAYS FROM 10TH KHUTOR DEPOSITE: FEATURES OF GENESIS, COMPOSITION AND ADSORPTION PROPERTIES." RUDN Journal of Engineering Researches 18, no. 1: 135-143.
The paper discusses the mechanism of montmorillonite structure alteration and bentonites properties modification (on the example of samples from clay deposit Taganka, Kazakhstan) due to the thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). With the use of the suit of methods certain processes were distinguished: transformation of montmorillonite structure, which appears in the leaching of interlayer and octahedral cations, protonation of the interlayer and OH groups at octahedral sheets. Changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant changes in the properties – reduction of cation exchange capacity and an increase of specific surface area. The results of the work showed that bentonite clays retain a significant portion of its adsorption properties even after the long term and intense thermochemical treatment (6M HNO3, 60°C, 108 hours)
Victoria V. Krupskaya; Sergey V. Zakusin; Ekaterina A. Tyupina; Olga V. Dorzhieva; Anatoliy P. Zhukhlistov; Maria N. Timofeeva; Petr E. Belousov. Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions. 2016, 1 .
AMA StyleVictoria V. Krupskaya, Sergey V. Zakusin, Ekaterina A. Tyupina, Olga V. Dorzhieva, Anatoliy P. Zhukhlistov, Maria N. Timofeeva, Petr E. Belousov. Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions. . 2016; ():1.
Chicago/Turabian StyleVictoria V. Krupskaya; Sergey V. Zakusin; Ekaterina A. Tyupina; Olga V. Dorzhieva; Anatoliy P. Zhukhlistov; Maria N. Timofeeva; Petr E. Belousov. 2016. "Experimental Study of Montmorillonite Structure and Transformation of its Properties under the Treatment of Inorganic Acid Solutions." , no. : 1.