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Journal articles on the topic 'Bentonite'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Pan, Yi, Xinyue Zhang, Chengcheng Ji, et al. "Modification Method of High-Efficiency Organic Bentonite for Drilling Fluids: A Review." Molecules 28, no. 23 (2023): 7866. http://dx.doi.org/10.3390/molecules28237866.

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The requirements for drilling bentonites are tightening due to ever-increasing demands for petroleum resources, coupled with cost and reaction technology constraints. In addition to raising the risk of drilling, bentonite’s poor performance also raises the possibility of safety incidents and significant financial losses. Organically modified bentonites effectively reduce the consumption of drilling fluids, conserve resources, and lessen environmental effects. This paper aims to provide an overview of the several organic modification methods of bentonite for drilling fluids. It also evaluates t

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2

Aji, Navela Rahma, Emas Agus Prastyo Wibowo, Resti Ujiningtyas, Hestin Wirasti, and Nuni Widiarti. "Sintesis Komposit TiO2-Bentonit dan Aplikasinya untuk Penurunan BOD dan COD Air Embung UNNES." Jurnal Kimia VALENSI 2, no. 2 (2016): 114–19. http://dx.doi.org/10.15408/jkv.v2i2.3620.

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Abstrak Telah disintesis komposit TiO2-bentonit untuk penurunan BOD dan COD. Penelitian ini bertujuan untuk mengetahui proses pembentukan komposit TiO2-Bentonit serta mengetahui katalis terbaik dalam proses fotodegradasi air embung. Penelitian diawali dengan preparasi TiO2-Bentonit. Hasil pembentukan komposit dikarakterisasi dengan menggunakan X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) dan Scanning Electron Microscope (SEM). Katalis yang diuji adalah TiO2, bentonit, TiO2-bentonit yang diaplikasikan ke air embung dengan waktu penyinaran selama 30 menit.Terbentuknya komposit TiO2

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3

Brezovska, Snezana, Biljana Marina, Donco Burevski, Biljana Angjuseva, Vasa Bosevska, and Lepa Stojanovska. "Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor." Journal of the Serbian Chemical Society 70, no. 1 (2005): 33–40. http://dx.doi.org/10.2298/jsc0501033b.

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In a previous paper, adsorption isotherms of benzene vapor on natural bentonite from Ginovci, Macedonia, and forms acid activated with 10% and 15% solutions of hydrochloric were interpreted by means of the Dubinin-Radushkevich-Stoeckli and Dubinin-Astakhov equations; the investigation has been continued with bentonites acid activated with 10% and 15% solutions of sulfuric acid where X-ray analysis indicates smaller structural changes. Using the above equations, the heterogeneity of the micropores and the energetic heterogeneity of the bentonites were determined from the differential distributi

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4

Lathifah, Tiva, Nia Yuliani, and Gladys Ayu Paramita Kusumah Wardhani. "BENTONIT TERAKTIVASI ASAM SULFAT SEBAGAI ADSORBEN DALAM PEMURNIAN PELUMAS BEKAS." Jurnal Sains Natural 9, no. 1 (2019): 1. http://dx.doi.org/10.31938/jsn.v9i1.170.

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Activated Bentonits of Sulfatic Acid as Adsorben in Purchase of Used Lubricants Recycling of used lubricating oil is one of the alternatives in the framework of efficiency, saving oil consumption, and reducing pollution. One effort to purify used lubricating oil is to separate impurities through the adsorption method. The adsorbent that can be used is bentonite. Activation of bentonite using acid will produce adsorbent with an active side and greater surface acidity so that the adsorption ability is higher than before activated. Characteristics of lubricating oil produced are: kinematic viscos

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5

Liu, Hao, Bing Xie, and Yue-lin Qin. "Effect of Bentonite on the Pelleting Properties of Iron Concentrate." Journal of Chemistry 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/7639326.

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The physical and chemical properties such as particle size, montmorillonite content, swelling degree, water absorption, and blue absorption of A, B, and C bentonites were studied under laboratory conditions. The effects of adding different quality and different proportion of bentonite on falling strength, compression strength, and shock temperature of green pellet were investigated. The experimental results show that the montmorillonite content, water absorption, and methylene blue absorption of bentonite-B are the highest. And the quality of bentonite-B is the best, followed by bentonite-C an

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6

Buzetzky, D., E. M. Kovács, M. N. Nagy, and J. Kónya. "Sorption of pertechnetate anion by cation modified bentonites." Journal of Radioanalytical and Nuclear Chemistry 322, no. 3 (2019): 1771–76. http://dx.doi.org/10.1007/s10967-019-06852-8.

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Abstract Pertechnetate anion sorption was investigated on modified bentonites. Mn-, Cr-, Sn-bentonites were prepared by ion exchange process to sorb radioactive pertechnetate ions. In the case of Mn-, Cr-bentonite the sorb amount of metal ion was 70–90% of the cation exchange capacity of the bentonite which is expected. Interestingly in the case of Sn-bentonite this amount was 1.42 times higher than the cation exchange capacity. On Mn-bentonite the sorption was 35% at pH 5. The removal of pertechnetate ions was 100% on Cr-, Sn-bentonites and the significant sorption was achieved below 650 mV/S

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7

A.P., Ihom, Agunsoye Johnson, Bam A., and Anbua E.E. "INVESTIGATION OF THE PROPERTIES OF A NIGERIAN AND A LIBERIAN BENTONITE FOR FOUNDRY APPLICATION." Continental J. Engineering Sciences 4 (July 22, 2009): 6–11. https://doi.org/10.5281/zenodo.833691.

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A Nigerian, and a Liberian Bentonite has been studied. The two Bentonite samples which were obtained from the natural geological source were critically studied. The study covered the physical, chemical, and the foundry properties of the two Bentonites. The sieve analysis of the sand used for the investigation of the foundry properties was also carried out. The result showed that the Liberian Bentonite is a sodium based Bentonite, with a Na<sub>2</sub>O content of 1.91% with only traces of CaO. The Bentonite equally had a swelling index of 15, and green shear and compression strengths of 6.90KN

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8

Wijayanto, Sofian, and Sunyoto Sunyoto. "Variasi Komposisi Bentonit pada Cetakan Pasir Blok Silinder Mesin Pemotong Rumput." Jurnal Dinamika Vokasional Teknik Mesin 4, no. 1 (2019): 31–38. http://dx.doi.org/10.21831/dinamika.v4i1.24281.

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Purpose of this research is to find out how the influence of variation of bentonite composition on the sand mold to casting defect, hardness, and microstructure. Variations of bentonite composition used were 0%, 8%, and 16%. The data of the research were analyzed directly using graphs and micro photographs which were then drawn conclusions from the results of the study. Needle-hole defects are found in all variations of bentonite composition. The porosity defect was found only in the variation of 0% and 16% bentonite compositions. The highest hardness value was obtained from the 8% bentonite c

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9

LV, Yiyan, Haoqing XU, Pengming JIANG, and Tao WU. "Effect of Bentonite Admixture Content on Effective Porosity and Hydraulic Conductivity of Clay-based Barrier Backfill Materials." Materials Science 29, no. 3 (2023): 340–46. http://dx.doi.org/10.5755/j02.ms.32075.

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Clay-based barrier wall has been diffusely employed as vertical barriers. Nevertheless, there were few project practices of these walls in China. And few research have been performed to study the impact on the permeability of the addition of domestic bentonites. To solve this problem, the influences of bentonite level on hydraulic conductivity, porosity and clay-bound water of soil-bentonite admixtures have been assessed employing a flexible-wall test and water centrifugal dewatering experiment with various bentonites. The outcomes revealed that as barrier walls are constructed by blending ben

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10

Gerasin, Viktor A., and Viktor V. Kurenkov. "JOINT TREATMENT OF BENTONITES WITH INORGANIC POLYELECTROLYTES AND CATIONIC SURFACTANTS IN ORDER TO PROMOTE ORGANOCLAY EXFOLIATION." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 5 (2019): 71–77. http://dx.doi.org/10.6060/ivkkt.20196205.5746.

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A new approach to production of organomodified bentonites is offered. Bentonites are consecutively treated with inorganic polyelectrolyte (sodium silicate solution) and quaternary ammonium salts, as a result exfoliated organoclays are obtained. An ejector set up has been used for treatment of natural bentonites. Samples of activated bentonites treated in the ejector set up with sodium silicate solution (up to 21 g of sodium silicate per 100 g of bentonite) were prepared. Structure of the obtained bentonite and organoclay samples was established by X-ray diffraction analysis. It has been shown

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11

Wijaya, Martin, Eng Choon Leong, and Hossam Abuel-Naga. "Shrinkage Curves for Powder and Granular Bentonites." E3S Web of Conferences 92 (2019): 07009. http://dx.doi.org/10.1051/e3sconf/20199207009.

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Bentonite is one of the most commonly used materials in geotechnical engineering applications especially for isolation purposes due its low permeability and its highly expansive nature. For instance, Geosynthetic Clay Liners (GCL) self-healing ability relies on the swelling properties of the bentonite to close any holes in the GCL while the low permeability of the bentonite serves to reduce the infiltration of leachate to the surrounding soil. However, different types of bentonite have different shrinkage or swelling properties and hence affects the effectiveness of the GCL. A method to assess

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12

Al-Asheh, Sameer, Fawzi Banat, and Leena Abu-Aitah. "The Removal of Methylene Blue Dye from Aqueous Solutions Using Activated and Non-Activated Bentonites." Adsorption Science & Technology 21, no. 5 (2003): 451–62. http://dx.doi.org/10.1260/026361703769645780.

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An improvement in the adsorption capacity of naturally available bentonite towards water pollutants such as Methylene Blue dye (MBD) is certainly needed. For this purpose, sodium bentonite was activated by two methods: (1) treatment with sodium dodecyl sulphate (SDS) as an ionic surfactant and (2) thermal treatment in an oven operated at 850°C. Batch adsorption tests were carried out on removing MBD from aqueous solution using the above-mentioned bentonites. It was found that the effectiveness of bentonites towards MBD removal was in the following order: thermal-bentonite > SDS-bentonite &g

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13

My Linh, Nguyen Le, Duc Hoang Van, Tran Duong, Mai Xuan Tinh, and Dinh Quang Khieu. "Adsorption of Arsenate from Aqueous Solution onto Modified Vietnamese Bentonite." Advances in Materials Science and Engineering 2019 (April 11, 2019): 1–13. http://dx.doi.org/10.1155/2019/2710926.

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In this study, pillared layered clays were prepared by modifying Vietnamese bentonite with polymeric Al and Fe. The obtained materials were characteristic of X-ray diffraction analysis, thermal analysis, and nitrogen adsorption/desorption isotherms. The results indicated that hydroxy-aluminum ([Al13O4(OH)24(H2O)12]7+) and poly-hydroxyl-Fe or polyoxo-Fe cations were intercalated into layers of clay, resulting in an increase of d001 values and of the specific surface areas compared with those of initial bentonite. Modified bentonites were employed to adsorb As(V) from aqueous solution. The adsor

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14

Zhang, Rong Bin, Liu Jing Yao, and Yan Ju. "Preparation of Au and Au-Ce Catalysts Supported on Acid-Activated Bentontie and its Catalytic Performance." Advanced Materials Research 287-290 (July 2011): 1704–7. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1704.

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Acid-activated by H2SO4was applied to modify bentonite. Acid-activated bentonite supported Au catalyst was prepared by deposition-precipitation and compared with SiO2supported one. CTAB was used to modify the surface of acid-activated bentonite. Au-Ce/bentontie catalyst was prepared by adding Ce into catalyst as assistant. CO oxidation was used to evaluate the catalytic activity of samples. These samples were characterized by BET, XRD, ICP and CO-TPD. The activity results showed that Au/Bentonite was more active than Au/SiO2. The BET results showed that the surface area and pore volume of acid

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15

Åhman, Birgitta. "Intake and excretion of water in reindeer - effects of supplements of potassium and bentonite." Rangifer 8, no. 2 (1988): 38. http://dx.doi.org/10.7557/2.8.2.749.

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<p>Supplements of potassium and bentonite are used to reduce absorption and increase excretion of radiocesium in reindeer. In a feeding experiment with 6 reindeer calves the effects of these supplements on water consumption and water excretion were measured. The experiment was made in three separate parts. During the first part (period I) the reindeer were fed pellets. Two reindeer god not supplements, two got 15 g K/day and two got 15 g K and 80 g bentonite/day. Supplements of K about doubled both the consumption of water and the excretion of urine. Bentonite gave no additional effect.

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16

Muslimah, Muslimah, Puji Wahyuningsih, and Yusnawati Yusnawati. "Effectiveness of Hydrochloric Acid Activated Bentonite in Local Salt Purification." Elkawnie 9, no. 1 (2023): 71. http://dx.doi.org/10.22373/ekw.v9i1.15229.

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Abstract: Various purification techniques have been developed to improve the quality of local salt, especially the NaCl content of more than 94%. One of the binding materials used in salt purification is bentonite. This study aims to synthesize modified bentonite using hydrochloric acid (HCl) solution and measure the metal content of NaCl, Pb, Ca, and Mg using AAS. The synthesis of activated bentonite was carried out using the hydrolysis method using 0.1 M HCl (1:10). Bentonite was separated from the filtrate and dried at 110°C for 2 hours. Bentonite, which had been activated with HCl, was dri

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17

Zhuravlev, F. M., E. V. Chuprinov, V. P. Lyalyuk, D. A. Kassim, and I. A. Lyakhova. "Material composition and characteristics of bentonite clays used as a binder in the production of iron ore pellets." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 76, no. 1 (2020): 30–40. http://dx.doi.org/10.32339/0135-5910-2020-1-30-40.

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In the production of iron ore pellets, binding additives are used, in particular, bentonite clays. At present, instead of alkaline bentonite clays used before, the alkaline-earth bentonite clays modified by soda ash are used, supplied from abroad. There is a whole number of bentonite clays deposits in Russia and Ukraine having reserves of the raw material accounting hundreds of million tons, which are not used in the industry because of absence of planned and proper studies of their applicability for pellets production. The analysis of chemical composition carried out and requirements to rheol

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18

Kuchkorov, Lochinbek, Nodirjon Tursunov, and Anna Avdeeva. "Improving physical and mechanical properties of bentonite clay from Navbahar clay deposit." E3S Web of Conferences 401 (2023): 05020. http://dx.doi.org/10.1051/e3sconf/202340105020.

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Different compositions of mixtures of sand and clay with medium-grade bentonite for molding of critical large parts of a freight car bogie are examined in the article. Different compositions to improve bentonite’s physical and mechanical properties, such as gas permeability and compressive strength with the addition of soda ash, are considered. As a material for the study of sand and clay mixtures were taken quartz sand grade 1K2O2025, medium strength bentonite Navbaharskogo birthplace, and for improving the physical and mechanical properties of bentonite - soda ash. One possible way to increa

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19

Bourliva, A., K. Michailidis, C. Sikalidis, and A. Filippidis. "Spectroscopic and thermal study of bentonites from Milos Island, Greece." Bulletin of the Geological Society of Greece 47, no. 4 (2013): 2020. http://dx.doi.org/10.12681/bgsg.11030.

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Bentonitic clays, currently in use in over hundred areas, are among the most important industrial raw materials. In most of the cases, bentonites predominantly consist of montmorillonite which is a 2:1 layer clay mineral formed by one alumina octahedral sheet placed between two silica tetrahedral sheets. Three bentonite composite samples (BN1, BN2, BN3) with some differences in mineralogical and chemical composition from Milos island (“Miloan”), Greece were investigated by X-ray diffraction (XRD), atomic absorption spectrometry (AAS), differential thermal analysis (DTA), thermogravimetric anal

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Chukwu, U. J., I. P. Okoye, and E. I. Awosu. "Impact of acid activated Bentonites on foster swelling capacity and sorption dynamics of hydrocarbons, phenol and water." Scientia Africana 20, no. 1 (2021): 101–8. http://dx.doi.org/10.4314/sa.v20i1.9.

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The successful protonation of the dissociable 𝐻 + from different organic acids (with varying alkyl chains) to supplant sodium ions in the inter layers of bentonites resulting in increased surface area has been carried out. The resultant materials were characterized using foster swelling and adsorption capacity techniques. Results show that the foster capacities of acid activated bentonites were greater than the un-activated bentonite (UAB) upon interaction with petroleum hydrocarbons. The bentonite activated with the organic acid having the most alkyl chain, hexanoic acid activated bentonite (

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21

Komine, Hideo, and Nobuhide Ogata. "Prediction for swelling characteristics of compacted bentonite." Canadian Geotechnical Journal 33, no. 1 (1996): 11–22. http://dx.doi.org/10.1139/t96-021.

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Compacted bentonites are attracting greater attention as back-filling (buffer) materials for high-level nuclear waste repositories. For this purpose, it is very important to quantitatively evaluate the swelling characteristics of compacted bentonite. New equations for evaluating the relationship between the swelling deformation of compacted bentonite and the distance between two montmorillonite layers are derived. New equations for evaluating the ion concentration of pore water and the specific surface of bentonite, which significantly influence the swelling characteristics of compacted benton

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22

Liu, Xiao Dong, Xian Jun Lu, Jun Qiu, Zhi Ming Wang, and Peng Wu. "Purification of Low Grade Ca-Bentonite for Iron Ore Pellets." Advanced Materials Research 454 (January 2012): 237–41. http://dx.doi.org/10.4028/www.scientific.net/amr.454.237.

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According to the bentonites properties and mineral composition, three bentonites with 32-36% montmorillonite content(MC) from Laiyang, Shandong, China, are purified for utilizing low grade bentonite sufficiently. Research shows that the purification is effective by separating –325 mesh products from raw bentonite after soaking, stirring and rubbing in water. Firstly, the three bentonites are combined into one and soaked in water for 24h with the ratio of liquid and solid 15:1, and then, the bentonite is purified using –325 mesh sieve after stirring and rubbing in water for 1h with pulp density

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23

Tan, Yunzhi, Hui Li, De’an Sun, and Huajun Ming. "Granular Bentonite Preparation and Effect of Granulation Behavior on Hydromechanical Properties of Bentonite." Advances in Civil Engineering 2020 (September 10, 2020): 1–13. http://dx.doi.org/10.1155/2020/8879792.

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Compacted bentonite is regarded as a suitable buffer/backfill material in a high-level radioactive waste disposal repository due to its low permeability, high swelling, and strong adsorption capacity, but the bentonite powder is difficult to compact to a high density only by increasing the compaction energy. Hence, a proposal is made to improve the compactness of bentonite by changing its grain size distribution. To obtain bentonite granules with different sizes, a granulation method is proposed in this paper, in which bentonite powders experience the processes of wetting and drying into plate

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24

Izosimova, Yulia, Inna Tolpeshta, Irina Gurova, Michail Karpukhin, Sergey Zakusin, and Victoria Krupskaya. "Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5." Minerals 10, no. 12 (2020): 1121. http://dx.doi.org/10.3390/min10121121.

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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

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25

Jeon, Han Yong. "Temperature Effects and pH Value on Free Swell Behaviors of Bentonite Solutions." Advanced Materials Research 983 (June 2014): 44–51. http://dx.doi.org/10.4028/www.scientific.net/amr.983.44.

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Swelling behaviors of powder and granular type sodium bentonites in permeate solutions such as NaCl, KCl, MgCl2, CaCl2, distilled water and in HCl and NaOH (with different pH values) under different temperatures were investigated. Swelling behaviors of these bentonites were dependent on strength, reactivity power and physical form of ion, and temperature and pH value of permeate solution. +1 ion solution showed higher swell volumes than +2 ion solution. Distilled water showed highest swell volumes among these tested solutions. Powder type sodium bentonite showed higher swells volume than granu

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26

Ahmad Fauzi, A. A., Azlin Fazlina Osman, M. A. A. Abdullah, and S. Mandal. "Destabilization of Natural and Commercial Bentonite Interlayers by Ultrasonication, pH Control and Salt Addition." Solid State Phenomena 280 (August 2018): 115–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.115.

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Natural and commercial bentonites can act as efficient fillers to reinforce a polymer matrix if their strong interlayer binding forces are weakened to reduce tactoid formation. In this research, interlayers destabilization process was applied to gain a loosely packed, swelled and disorganized clay layered structure for better polymer intercalation and filler dispersion during the polymer/clay composite fabrication. Three different destabilization methods were applied to the natural and commercial bentonites and their effects on swelling and platelets ordering/stacking of the clays were observe

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Barker, Ivan R., Desmond E. Moser, Sandra L. Kamo, and A. Guy Plint. "High-precision U–Pb zircon ID–TIMS dating of two regionally extensive bentonites: Cenomanian Stage, Western Canada Foreland BasinThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh." Canadian Journal of Earth Sciences 48, no. 2 (2011): 543–56. http://dx.doi.org/10.1139/e10-042.

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The stratigraphy of Cretaceous rocks in the Western Canada Foreland Basin is well constrained by dense borehole data that allow three-dimensional mapping of transgressive–regressive events, paleogeography, and subsidence patterns. However, it is difficult to estimate rates of change or to place events in a precise temporal framework because very few of the many bentonite beds have been dated using modern techniques. In this study, two bentonites, of at least regional extent, were dated using isotope dilution – thermal ionization mass spectrometry (ID–TIMS) U–Pb methods on chemically abraded zi

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Yildiz, A., and M. Kuscu. "Origin of the Basoren (Kutahya, W Turkey) bentonite deposits." Clay Minerals 39, no. 2 (2004): 219–31. http://dx.doi.org/10.1180/0009855043920132.

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AbstractBentonite deposits in Basoren Kutahya, West Anatolia, Turkey formed from alteration of perlite and pyroclastic rocks of Pliocene age. The distribution of bentonite deposits along faults in the study area indicates that the alteration solutions were hydrothermal. Although lateral zonation is observed in bentonite deposits in some regions (i.e. Demirli, Akyokus, Seklice- Sarıokuz, etc.), alteration zones are extremely irregular in the Cayırlık bentonite deposit.X-ray diffraction studies have shown that Basoren bentonites contain dioctahedral Ca-smectite.The Greene-Kelly test (Li-saturati

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29

Piluarto, Bambang, Yusril Ihza Mahendra, and Novita Andarini. "HYBRID KITOSAN/BENTONIT SEBAGAI MATRIKS UNTUK PELEPASAN ION AMONIUM DALAM AIR." Jurnal Kimia Riset 1, no. 1 (2016): 42. http://dx.doi.org/10.20473/jkr.v1i1.2441.

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AbstrakHybrid kitosan/bentonit dalam bentuk bead telah berhasil dibuat dengan berbagai rasio komposisi kitosan dan bentonit. Dalam penelitian ini, bead dari hybrid ini digunakan sebagai matriks untuk ion amonium. Bead dibuat dengan pengendapan suspensi kitosan dan bentonit menggunakan koagulan NaOH. Bead hybrid yang diperoleh dikarakterisasi daya serap air (DSA) dan pelepasan ion amonium dalam air. Hasil yang diperoleh menunjukkan bahwa bentuk bead dipengaruhi oleh kandungan bentonit dalam hybrid. Peningkatan kandungan bentonit dalam hybrid menurunkan nilai DSA, namun meningkatkan pelepasan io

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30

Jovic-Jovicic, Natasa, Danica Bajuk-Bogdanovic, Tatjana Novakovic, Predrag Bankovic, Aleksandra Milutinovic-Nikolic, and Zorica Mojovic. "Electrochemical properties of carbonized bentonite." Journal of the Serbian Chemical Society, no. 00 (2022): 30. http://dx.doi.org/10.2298/jsc220127030j.

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Organomodified bentonites were obtained by modification of bentonite clay from local mine Bogovina with four different alkylammonium ions in the amounts that correspond to cation exchange capacity. Carbonized bentonites, obtained by pyrolyzing the organomodified bentonites in the flow of nitrogen, were characterized using the XRD, low-temperature N2 physisorption, and Raman spectroscopy. Structural and textural properties of carbonized bentonites depended on the arrangement of alkylammonium cations in the paternal organomodified bentonite, while the Raman spectroscopy confirmed the presence of

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Osacky, M., V. Šucha, M. Miglierini, and J. Madejová. "Reaction of bentonites with pyrite concentrate after wetting and drying cycles at 80°C: relevance to radioactive waste (Radwaste) storage." Clay Minerals 47, no. 4 (2012): 465–79. http://dx.doi.org/10.1180/claymin.2012.047.4.06.

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AbstractThe mineral stability of two bentonites was studied in the presence of pyrite concentrate to simulate the possible reactions between the bentonite barrier used in a high-level nuclear waste (HLW) repository and host rock containing up to 5 wt.% of admixed pyrite. Smectite was the only bentonite mineral affected by pyrite treatment under the experimental conditions used. Bentonites reacted differently with pyrite due to the different nature of the smectites. The distinct crystal chemistry of the smectites controlled by the composition of the parent rocks influenced the smectite surface

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Sari, Nerry Puspita, and Pirim Setiarso. "PEMBUATAN ELEKTRODA KERJA GRAPHENE OXIDE TERMODIFIKASI NANO BENTONIT UNTUK ANALISIS ASAM NIKOTINAT SECARA VOLTAMETRI SIKLIK MAKING OF GRAPHENE OXIDE NANO BENTONITE MODIFIED WORKING ELECTRODE FOR ANALYSIS NICOTINIC ACID USING CYCLIC VOLTAMMETRY." Unesa Journal of Chemistry 9, no. 3 (2020): 170–78. http://dx.doi.org/10.26740/ujc.v9n3.p170-178.

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Pada penelitian ini telah dilakukan penelitian pengukuran asam nikotinat menggunakan elektroda kerja Graphene oxide termodifikasi nano bentonit dengan metode voltametri siklik. Elektroda kerja Graphene oxide termodifikasi nano bentonit dibuat dengan cara mencampurkan Graphene oxide, parafin, dan nano bentonit dengan perbandingan 3:5:2, 3:4:3, 3:3:4, 3:2:5. Parameter optimasi yang diuji yaitu kondisi optimum (pH, waktu deposisi, dan laju pindai), komposisi modifier nano bentonit yang ditambahkan. Elektroda kerja Graphene oxide termodifikasi nano bentonit pada kondisi pengukuran optimum digunaka

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Safitri, Rahayu Puji, Mochammad Arief Budihardjo, and Budi Prasetyo Samadikun. "Sistematik Review: Perbandingan Penggunaan Kaolin dan Bentonit dalam Penelitian Remediasi Elektrokinetik untuk Penyisihan Logam Berat." Jurnal Kesehatan Lingkungan Indonesia 21, no. 3 (2022): 301–10. http://dx.doi.org/10.14710/jkli.21.3.301-310.

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Latar belakang: Perbedaan mekanisme remediasi elektrokinetik salah satunya disebabkan oleh distribusi gugus ≡SOH yang berbeda beda pada jenis lempung yang dapat mengontrol muatan permukaan lempung. Bentonit dan kaolin merupakan jenis lempung yang seringkali digunakan dalam penelitian remediasi elektrokinetik tanah terkontaminasi logam berat. Oleh karenanya, tujuan dari review jurnal ini adalah mengkaji perbandingan penggunaan kaolin dan bentonit dalam remediasi elektrokinetik tanah terkontaminasi logam berat, baik dalam publikasi penelitiannya, karakteristiknya dan pengaruhnya terhadap mekanis

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Zhang, Bing Bing, Ming Yue Miao, Jing Bai, et al. "Researches on Purification and Sodium-Modification of Ca-Bentonite by Tri-Roller Grinder." Advanced Materials Research 962-965 (June 2014): 809–13. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.809.

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To fully evaluate the usability of a raw Ca-bentonite source and to deeply understand the property of bentonite mineral are critical for applications of these special layered materials. Due to sodium bentonites have several advantages over calcium bentonites, especially in expansibility, cation exchange capacity, cohesive force, dispersibility, and thermostability, sodium-modification of Ca-bentonite is regarded as a top priority of effective utilization of abundant Ca-bentonite source in China. In present work, the purified Na-montmorillonite was synthesized by purification and sodium-modific

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Mota-Heredia, Carlos, Jaime Cuevas, and Raúl Fernández. "Effect of Iron Chloride (II) on Bentonites under Hydrothermal Gradients: A Comparative Study between Sodium Bentonite and Calcium Bentonite." Minerals 14, no. 2 (2024): 132. http://dx.doi.org/10.3390/min14020132.

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This study investigates the performance of two bentonite materials, specifically MX-80 (Na-bentonite) and FEBEX (Ca-Mg-Na-bentonite), employed as engineered barriers in deep geological disposal facilities for the isolation of high-level radioactive waste, contained in metallic canisters. Experiments conducted at the laboratory scale focused on the interaction of these bentonites with FeCl2 powder, used as a soluble iron source, to observe enhanced alteration of the bentonite. The experiments were carried out under a hydrothermal gradient. A dominant Na-Cl-SO4 saline solution was put in contact

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Sudheer Kumar, Ritwick, Carolin Podlech, Georg Grathoff, Laurence N. Warr, and Daniel Svensson. "Thermally Induced Bentonite Alterations in the SKB ABM5 Hot Bentonite Experiment." Minerals 11, no. 9 (2021): 1017. http://dx.doi.org/10.3390/min11091017.

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Pilot sites are currently used to test the performance of bentonite barriers for sealing high-level radioactive waste repositories, but the degree of mineral stability under enhanced thermal conditions remains a topic of debate. This study focuses on the SKB ABM5 experiment, which ran for 5 years (2012 to 2017) and locally reached a maximum temperature of 250 °C. Five bentonites were investigated using XRD with Rietveld refinement, SEM-EDX and by measuring pH, CEC and EC. Samples extracted from bentonite blocks at 0.1, 1, 4 and 7 cm away from the heating pipe showed various stages of alteratio

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Kaufhold, Stephan. "Discussion of parameters used to distinguish suitable from less suitable HLRW bentonites." Safety of Nuclear Waste Disposal 1 (November 10, 2021): 125–26. http://dx.doi.org/10.5194/sand-1-125-2021.

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Abstract. Bentonites will be used in the construction of some high-level radioactive waste (HLRW) repositories mostly in combination with crystalline host rocks. They will be used both as a geotechnical barrier (compacted bentonite blocks) around the canisters and for backfilling. The bentonite should be stable in contact with cement pore water, minimize metal corrosion, be stable against erosion and various salt solutions, retard radionuclides, prevent canister displacement, possess high thermal conductivity, be stable against radioactive radiation, keep its swelling capacity even when dried,

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E, Chuprinov, Lyalyuk V, Zhuravlev F, Kassim D, and Lyakhova I. "The potential of using of alkaline earth bentonite clays of Ukraine in the production of iron ore pellets." Theory and practice of metallurgy 1,2020, no. 1,2020 (124) (2020): 36–43. http://dx.doi.org/10.34185/tpm.1.2020.05.

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Objective: to analyze and determine the potential of alkaline earth bentonite clays of Ukraine for use as a binder in the production of iron ore pellets. Methods: performing rheological studies of bentonite clay samples and their chemical analysis, electron microscopic studies of samples. Results: the analysis of the chemical composition and requirements for the rheological characteristics of bentonite clays used in the production of iron ore pellets at metallurgical enterprises of Russia and Ukraine is carried out. The swelling indicators and water absorption of monoionic forms of bentonites

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Astaykina, A. A., I. I. Tolpeshta, Yu G. Izosimova, and R. A. Streletskii. "Adsorption of 2,4-dichlorophenoxyacetic acid from aqueous solution using organo-modified bentonite clay." Lomonosov Soil Science Journal 80, no. 2, 2025 (2025): 156–65. https://doi.org/10.55959/msu0137-0944-17-2025-80-2-156-165.

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A laboratory experiment was carried out to investigate the sorption behavior of 2.4-D onto two types of bentonite material: Na-Ca bentonite and organically modified bentonite (HDTMA-Br) using hexadecyltrimethylammonium bromide. The amount of HDTMA-Br was equivalent to the cation exchange capacity of the dominant mineral, montmorillonite, in the bentonites. The results showed that the organically modified bentonite absorbed 4.5 times more 2.4-D compared to the unmodified Na-Ca bentonite, indicating a significantly stronger sorption affinity for the organic cation. This finding suggests that org

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Zaimahwati, Zaimahwati, Yuniati Yuniati, Ramzi Jalal, Syahman Zhafiri, and Yuli Yetri. "Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit." Jurnal Katalisator 3, no. 1 (2018): 12. http://dx.doi.org/10.22216/jk.v3i1.2729.

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<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara. Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nano

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DOLATI, Samira, and Mohsen KALANI. "STRUCTURAL CHARACTERIZATION OF A BENTONITE DEPOSIT FROM THE EASTERN IRAN; COMPARISON WITH TWO REFERENCE BENTONITES." Carpathian Journal of Earth and Environmental Sciences 16, no. 1 (2021): 151–62. http://dx.doi.org/10.26471/cjees/2021/016/163.

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Mineralogically, bentonites are dominated by smectites and due to characteristic textural and physicochemical properties of smectites (e.g. very small particle sizes, high cation exchange capacity) are of a great use in industrial applications. In this study, a bentonite sample was characterized with regard to the particle size distribution, mineralogical composition and cation exchange capacity in comparison with the data for the two internationally well-known bentonites representative for Na- and Ca-bentonites: the Mx-80 bentonite of Wyoming, USA and that of Milos, Greece, respectively. Resu

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My Linh, Nguyen Le, Tran Duong, Hoang Van Duc, et al. "Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite." Journal of Chemistry 2020 (July 28, 2020): 1–14. http://dx.doi.org/10.1155/2020/1504805.

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In the present work, the modified bentonites were prepared by the modiﬁcation of bentonite with cetyltrimethylammonium bromide (CTAB), both cetyltrimethylammonium bromide and hydroxy-Fe cations and both cetyltrimethylammonium bromide and hydroxy-Al cations. X-ray diffraction (XRD), thermal analysis (TG-DTA), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms were utilized to characterize the resultant modified bentonites. The modified bentonites were employed for the removal of phenol red dye from aqueous solution. Phenol red adsorpt

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Tanjaya, Ailen, S. Sudono, Nani Indraswati, and Suryadi Ismadji. "Aktivasi bentonit alam pacitan sebagai bahan penyerap pada proses pemurnian minyak sawit." Jurnal Teknik Kimia Indonesia 5, no. 2 (2018): 429. http://dx.doi.org/10.5614/jtki.2006.5.2.4.

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Application of pacitan's bentonite as adsorbent in purification process of palm oil. Bentonite is one of the widely use adsorbent which is usually used in the bleaching process of edible palm oil to remove pigments color and other impurities which can improve the sensory quality and the oxidative stability of the oil. Bleaching capacity from bentonite can be improved by acid activation, to modified the structure as well as to improve the sorptive surface area. The aim of this research was to determine the optimum acid concentration for the activation of bentonite from Pacitan, East Java. The b

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Kussainova, Bakytgul, Gaukhar Tazhkenova, Ivan Kazarinov, et al. "Comparative Study of the Physico-Chemical Properties of Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminium (III) Polyhydroxocations." Coatings 13, no. 11 (2023): 1974. http://dx.doi.org/10.3390/coatings13111974.

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A comparative study of the physicochemical properties of natural bentonite clays of Pogodayevo (Republic of Kazakhstan, mod. 1) and Dash-Salakhli (Republic of Azerbaijan, mod. 2) deposits and modification of the bentonite clay with polyhydroxocations of iron (III) and aluminium (III). The amount of bentonite in the concentration of iron (aluminum) was 5 mmol Me3+/g. It was established that the modification of natural bentonites using polyhydroxocations of iron (III) (mod. 1_Fe_5-c, mod. 2_Fe_5-c) and aluminum (III) (mod. 1_Al_5-c, mod. 2_Al_5-c) by the method of “co-precipitation” leads to a c

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Haerudin, Hery, Nino Rinaldi, and Adel Fisli. "CHARACTERIZATION OF MODIFIED BENTONITE USING ALUMINUM POLYCATION." Indonesian Journal of Chemistry 2, no. 3 (2010): 173–76. http://dx.doi.org/10.22146/ijc.21913.

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The modification of bentonite by pillarization using aluminum polycation type Keggin [Al13O4(OH)24(H2O)12]7+ has been carried out, by exchange of cation from interlayer with aluminum polycation. The amount of aluminum polycation, which was used for the pillaring of bentonite was varied, i.e. 5 mmol/gram, 10 mmol/gram, and 20 mmol/gram of bentonite. After drying, the pillared bentonite was calcined at 400 oC for 6 hour with temperature rate of 5 oC/min. The cationic exchange capacity (CEC) of starting bentonite was 98.3 meq/100 gram. The concentration ratio of Al/Si increased from 0.27 to 0.34

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Yulanda, Andesta, Lisna Wahyuni, Rahmi Safitri, Abu Bakar, and Muhammad Dani Supardan. "Pemanfaatan Bentonit sebagai Penyerap Air pada Proses Transesterifikasi Minyak Jelantah Menjadi Biodiesel." Jurnal Teknologi dan Industri Pertanian Indonesia 10, no. 2 (2018): 14–19. http://dx.doi.org/10.17969/jtipi.v10i2.10577.

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ABSTRAK. Transesterifikasi merupakan salah satu proses dalam pembuatan biodiesel. Metode transesterifikasi secara konvesional tanpa penambahan adsorben memiliki kekurangan pada rendemen dan mutu biodiesel sehingga dikembangkan metode transesterifikasi menggunakan adsorben secara simultan. Penelitian ini bertujuan untuk pemanfaatan bentonit sebagai penyerap air untuk meningkatkan rendemen biodiesel pada proses transesterifikasi minyak jelantah. Pertama dilakukan pengecilan ukuran bentonit menjadi 100 hingga 120 mesh dan dilanjutkan dengan aktivasi bentonit menggunakan asam sulfat 98% pada suhu

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Andrejkovičová, Slávka, Martin Pentrák, L'uboš Jankovič, and Peter Komadel. "Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central Slovakia." Geologica Carpathica 61, no. 2 (2010): 163–71. http://dx.doi.org/10.2478/v10096-010-0008-1.

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Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central SlovakiaThe main purpose of this work was to determine adsorption characteristics of heavy metal cations on two Slovak bentonites. Adsorption of Pb2+, Zn2+, Cu2+and Cd2+on Jelšový Potok (JP) and Lieskovec (L) bentonites was studied by the batch equilibration technique using solutions of different concentrations. Higher smectite content (81 mass %) and higher cation exchange capacity (CEC) (105 mmol M+/100 g) of JP bentonite cause higher adsorption of all heavy metals in comparison with L bentonite. JP adsorbed h

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Rodríguez-Ameijide, Vanina, Andrea Maggio, Manuel Pozo, M. Belén Gómez, Pablo M. Naranjo, and M. Eugenia Roca-Jalil. "Assessment of Sorption of Anthocyanins from Red Cabbage onto Bentonites from Patagonia (Argentina)." Minerals 14, no. 2 (2024): 133. http://dx.doi.org/10.3390/min14020133.

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In the northern Patagonian region of Argentina, some of the largest bentonite deposits exist. Four bentonite samples (B1, B2, B3, and B4) from two deposits were thoroughly characterised and evaluated as potential adsorbents of anthocyanins extracted from red cabbage. Anthocyanins (ACys) are natural colourants obtained from fruits and plants and have shown excellent antioxidant properties that have promising applications in health. The adsorption of ACys onto bentonites enhances their stability relative to that observed in aqueous solutions. Material characterisation showed that three of the sa

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Komine, Hideo, and Nobuhide Ogata. "New equations for swelling characteristics of bentonite-based buffer materials." Canadian Geotechnical Journal 40, no. 2 (2003): 460–75. http://dx.doi.org/10.1139/t02-115.

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Compacted bentonite and sandbentonite mixtures are attracting greater attention as buffer material for repositories of high-level nuclear waste. This buffer material is expected to fill up the space between the canisters containing the waste and the surrounding ground by swelling. To produce the specifications, such as dry density, sandbentonite mass ratio, and dimensions, of the buffer material, the swelling characteristics of compacted bentonite and sandbentonite mixtures must be evaluated quantitatively. New equations for evaluating the swelling behavior of compacted bentonite and sandb

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Wijaya, Karna, Ani Setyo Pratiwi, Sri Sudiono, and Emi Nurahmi. "STUDY OF THERMAL AND ACID STABILITY OF BENTONITE CLAY." Indonesian Journal of Chemistry 2, no. 1 (2010): 22–29. http://dx.doi.org/10.22146/ijc.21929.

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The thermal and acid stability of the bentonite clays (Na- and Ca-bentonite) have been tested. The thermal stability testing has been carried out by heating 5 gram of the clays for five hours at 200, 300 and 500 °C respectively, meanwhile acid stability testing was performed by immersing 5 gram clays into 100 mL sulphuric acid 1M, 2M and 3M for 24 hours. The tested clays, then were characterized by means of X-Ray difractometry and IR-spectroscopy methods. The characterization results showed that upon heating, both Ca- and Na-bentonites indicated same thermal stability. However, upon acid treat

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