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The influence of alkaline aqueous solutions on the properties of bentonite was investigated to evaluate the performance of bentonitic engineered barriers when contacted with alkaline groundwater. Batch and hydraulic conductivity tests were conducted on Na-bentonite using six different alkaline aqueous solutions. For the batch tests, …
A new method of Na-activation of raw bentonite, rich in Ca-montmorillonite, consisting of combined thermal treatment at 200 °C, followed by immediate impregnation with aqueous solution of Na2CO3 ...
Different species of bentonite are nominated base on the predominant elements existed in their structure, including calcium, potassium, aluminum, or sodium. In general, bentonite is formed by the erosion of volcanic ash mainly in the existence of water.
Bentonite is a type of absorbent clay primarily composed of aluminosilicate minerals such as montmorillonite. It was named after Fort Benton in Wyoming, where the largest …
The XRD data show that adding sodium carbonate causes changes or modifications in the minerals structure of the bentonite, as seen in the Na-bentonite patterns (Na 2 CO 3) (Fig. 1). The activated ...
The influence of chemical activation–natrification of bentonites on adsorption of Cs and Sr was studied with regards to utilization of bentonites for depositing high-level radioactive waste and spent nuclear fuel. Bentonite samples from three Slovak deposits in three different grain-size (15, 45 and 250 μm), natural and natrified forms (Na …
structure of Mt in the original GMZ Na-bentonite is intact, and the layer spacing value is 1.10 nm, wh ich demonstrates that the layer spacing value of Mt increases after GMZ Na-bentonite is ...
Egyptian bentonite was crushed, grinded by a ball mill, purified using magnetic separation, treated with 0.1N acetic acid, and finally activated by Acid activation (HCl, H2SO4) and alkali ...
The Wyoming bentonite originated from Wyoming in USA has been chosen as an engineered barrier for high-level radionuclide waste (HLW) repositories in many countries, including the USA, Finland, and Sweden [].An important research content of the safety assessment of a HLW repository is the prediction of the effective diffusion …
The effect of salinity on the swelling pressure for the Ca-bentonite was different from that for Na-bentonite. The swelling pressure of the Ca-bentonite was higher in a diluted concentration of NaCl solution (0.04 M) compared with de-mineralized water, and it then decreased with an increase in the concentration of the NaCl solution beyond …
Bentonite is a complex hydrated aluminium silicate with exchangeable cationic components: (Al, Fe, Mg) Si 4 O 10 (OH) 2 (Na,Ca). The most commonly used …
Compacted MX-80 bentonite is a potential backfill material in radioactive-waste repositories. Pore space in MX-80 has been the subject of considerable debate. 3D reconstructions of the pore space based on tomographic methods could provide new insights into the nature of the pore space of compacted bentonites.
For the synthesis of ionogels containing microcrystalline cellulose (MCC) and Na-bentonite (Na-Bent), ionic liquid (IL) 1-butyl-3-methylimidazolium acetate was used as an MCC solvent. Characterization and research of the physicochemical properties of the synthesized materials were carried out using methods such as SEM, WAXS, thermal …
The unique sandwich structure formed between Na-Bentonite and MXene nanosheet increases the water or oil holding capacity of membrane and endows the composite membrane with switchable wettability surface. In addition, the composite membrane has good stability and anti-fouling property, which presents excellent and …
When bentonite is in contact with water, the layered structure will expand with the hydration of Na + and Ca 2+, to turn into a hydrophilic characteristic 3. The adsorptive behavior of the natural ...
The structure of bentonite consists of two basic building blocks: the aluminum octahedral sheets and silica tetrahedral sheets, as illustrated in Figure 2. ... sodium (Na) bentonite and calcium ...
Download scientific diagram | TG/DTG/DTA profiles of parent bentonite. from publication: Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition | A new ...
The FT-IR spectra of the Na-BT and MBT materials modified with different PEGs under an addition amount of 2 wt% were shown in Fig. 1 A and B. For the Na-BT (Fig. 1 A), the peak at 3625 cm −1 was assigned to the Al-OH stretching vibration.The peaks at 3446 cm −1 and 1638 cm −1 were due to the stretching vibration of the OH …
Bentonite is a clay rock composed of montmorillonite, which has a cation layer in its crystallographic structure. Na+ ions are mainly present in the cation layer in montmo-rillonite and the clay is called "Na-type bentonite." Na-type bentonite exhibits large swelling, suspension stability and thickening; therefore, it is used for boring mud ...
This research investigates the permeability and compressibility performance of aeolian-Na/Ca-bentonite mixtures (ANB/ACB) with varying bentonite contents, subjected to different freeze–thaw cycles, in which the particle size analysis, permeability tests, and compression tests are employed. The results indicate that: (1) with increasing …
The effect of FeCl 3 in acetonic medium on the structure of Na-bentonite was studied using X-ray diffraction (XRD), 57 Fe Möss spectroscopy, X-ray fluorescence spectroscopy and infrared spectroscopy to describe the structure of the bentonite before and after treatment. In the samples treated with FeCl 3, an increase in the basal spacing …
The influence of different environments on the structure of Gaomiaozi bentonite (GMZ) and GMZ colloids (GMZC) is presented here. Different hydrated interlayer structures of bulk and colloidal forms of this bentonite from small-angle X-ray scattering (SAXS) data are demonstrated. ... The effect of Na +, K +, Mg 2+, and Ca 2+ on the lamellar ...
Bentonite is a complex hydrated aluminium silicate with exchangeable cationic components: (Al, Fe, Mg) Si 4 O 10 (OH) 2 (Na,Ca). The most commonly used bentonite form in oenology is the sodium bentonite. Sodium bentonites have enhanced protein binding capabilities over calcium bentonites ... The intricate crystal structure of …
This study conducted several adsorption tests to cesium on natural Na-bentonite and Ca-bentonite. The results indicate that adsorption could be completed within 12 h, the optimal solid–liquid ratio was 20 g/L, a weakly alkaline environment was more suitable for adsorption, and the maximum adsorption capacity of Ca-bentonite …
Bentonite, considered a clay, is formed from the decomposition of volcanic ash and is mined from specific regions around the world. Bentonite for winemaking is supplied as a dried, granular clay. Upon microscopic examination bentonite is composed of small plates (or flakes) of silicon and aluminum oxide, along with so…
The interesting thing is that a thin fragment nanosheet and fluffy layered structure in the g-C 3 N 4 /Na-bentonite sample can be obviously observed (Fig.3 e-f), which is indicative of the appropriate combination of the Na-bentonite and g-C 3 N 4 layers. It is worth mentioning that the observed structure (nanosheet and fluffy layered …
The effect of FeCl3 in acetonic medium on the structure of Na-bentonite was studied using X-ray diffraction (XRD), 57Fe Möss spectroscopy, X-ray fluorescence spectroscopy and infrared ...
The porous structures of the modified Na-BT (MBT) samples were tuned under the synergistic effects of PEG-intercalation interaction, particle surface charge and water replacement, which promoted the intrusion of the mixture precursor of TDI and castor oil into the internal pores of the MBT filler.
Importantly, it was clear that the crystalline structure of bentonite was essentially unchanged by its co-pyrolysis and the strong chemical binding of the components in the clay/biochar composites. SEM images of BT-600 presented a loose and multilayer morphology of bentonite structure, attributed to the loss of structural water …
The initial soil used in this test is Na-bentonite, and its basic physical properties are shown in Table 1.The mold for the electrolysis test was a semi-circular acrylic groove made by ourselves, as shown in Fig. 2: the middle part is an electrolytic cell, and the parts on both sides are solution pools.The Na-bentonite is mixed in a 0.15 mol/L KCl …