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This study investigated the mechanisms governing bentonite erosion in a fracture with a naturally varying aperture. MX-80 bentonite was used, as it is proposed for geological disposal in the SKB and Posiva disposal concept. The aim of the study was to evaluate the level of conservatism in current models, such as that used in the KBS-3V safety ...
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The diffusive gradients in thin films (DGT) technique was applied to determine the mechanism by which bentonite improves the eutrophic lake sediment microenvironment and enhances submerged plant growth. The migration dynamics of N, P, S, and other nutrient elements were established for each sediment layer and the …
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Therefore, the objective of this work is to clarify the mechanisms of bentonite colloid aggregation, retention, and release in porous media under various solution chemistry conditions including cation type, HA concentration and transient solution chemistry. Density functional theory (DFT) simulations and the colloid filtration theory …
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The application of bentonite significantly (P < 0.05) increased field water-holding capacity and plant available water in the 0–40 cm layer.
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In this study, bentonite (B) was modified by hydrochloric acid dopamine (PDA), and the modification was confirmed by XRD, SEM, EDS and thermogravimetric analysis. Hydrochloric acid dopamine modified bentonite (PDA-B) was synthesized by a facile one-step hydrothermal method, and the obtained material exhibited particle-like …
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DOI: 10.1016/j.clay.2023.106869 Corpus ID: 257066922; Review of polymer-amended bentonite: Categories, mechanism, modification processes and application in barriers for isolating contaminants
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Efficient removal of nitrate by three-dimensional electrocatalytic system with bentonite-based Cu-Ag particle electrode: Fabrication, process and mechanism. Author links open overlay panel Ruihua Xue a 1, Linye Zhang a b 1, Junchi Gu a, Yanling Zhou a, Guangtao Wei a, Changli Yang a, Zhile Huang a, Zhiwei Xie a. Show more.
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648 S. K. Kawatra and S. J. Ripke bentonite bonding mechanisms? Experiments explained in this paper show that bentonite is difficult to see within an iron ore pellet. Therefore, experiments were designed to develop and allow the study of bentonite fibers. The ability of bentonite to form fibers is explained based on a qualitative model and …
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Bentonite is a 2:1 layered clay that mainly constructed by montmorillonite mineral, and its unit layer consists of two Si 4+ tetrahedral sheets sandwiching one A1 3+ octahedral sheet ... Adsorption mechanism was determined to be electrostatic attraction and ligand exchange, and metal-O-P inner-sphere complex formed on LFB surface. ...
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The employment of bentonite modified loess (BML) is a common method of constructing the anti-seepage lining of landfills in the loess region of China, and its long-term secure performance is ...
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Dry desulfurization technology is one of the important means of flue gas desulfurization and SO2 control. In this paper, a series of desulfurizers with zinc oxide as the active component and bentonite as the carrier were prepared by the sol–gel method. The performance of the desulfurizers under different preparation process conditions …
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The bentonite fiber mechanism has been developed into a new theory. Based on this theory, experiments conducted under conditions that would promote formation of bentonite fibers were found to be associated with an increase in bonding. Once the fundamentals of bentonite binding mechanisms are completely understood, …
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Bentonite was modified with cetyltrimethylammonium bromide (CTAB). The organically modified bentonite (OMB) was used to remove phenol from aqueous solution, the microstructural changes were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM), and phenol adsorption kinetic was obtained using batch …
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Polymer-amended bentonite is a kind of high-performance bentonite material, which has been widely researched and applied in barrier engineering. This paper summarizes the modification mechanism and process of polymer-amended bentonite in previous studies and discusses its modification effect for impermeability and isolating …
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Bentonite can cause a decrease in the absorption of Tauroursodeoxycholic acid resulting in a reduced serum concentration and potentially a decrease in efficacy. Technetium Tc-99m oxidronate The serum concentration of Technetium Tc-99m oxidronate can be increased when it is combined with Bentonite.
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Modified bentonite. Bentonite, supplied by Sigma-Aldrich was applied as the raw precursor in this work. The acid modification was conducted by properly mixing bentonite with 8 M of nitric acid at ...
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Swelling Mechanism. The swelling mechanism of bentonite results from the unique microstructure and its net negative charge (Low 1987). Bentonite is a mixture of clayey …
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bentonite in KOH solution, the relationship between each inuencing factor and the alkaline buer characteristics was explained. Based on the alkaline buffer mechanisms, the thickness of the bentonite buer barrier without ABC during the operation of the HLW repository was determined. The results can enrich the research on the reaction system of
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Methane explosions threaten the safety of industrial security in modern society. To suppress such explosions, experiments were made through using different masses of bentonite power driven by CO2 within a pipe network set up in an independent way. The three factors, including the peak over-pressure of an explosion, the index of …
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So, the failure mechanism of bentonite under high-temperature conditions remains to be elucidated. Combined with molecular dynamics simulation, experiments and multi-characterizations, the failure mechanism of clay in the water-based drilling fluid at ultrahigh temperatures was revealed. It was found that high temperature could lead to ...
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In this study, CTAB was used to achieve organic modification of bentonite and the adsorption mechanisms of modified bentonite (CTAB-B) for acid red (AR) and acid fuchsin (AF) were studied in detail. The characterization studies revealed the basal spacing of CTAB-B increased from 1.5499 nm to 2.7886 nm, and its thermal stability and …
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High solid anaerobic digestion (AD) has been considered as a promising and sustainable technology for treating kitchen waste. To enhance AD of kitchen waste, alkali pretreatment and bentonite addition treatment (AP/Be) was performed on kitchen waste, and microbial community was investigated at different total solids (TS) content (10%, …
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Atrazine adsorption on modified clays was studied using a batch method. Bentonite clay was a poor adsorbent of atrazine as 9.4 % adsorption was observed at 1 …
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Bentonites are proposed to be used as buffers in high-level radioactive waste repositories. The elevated temperatures in repositories may, however, affect …
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Based on the alkaline buffer mechanisms, the thickness of the bentonite buffer barrier without ABC was calculated to be 71.83 cm when the operation time was 10,000 a, which could be used for ...
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The unique feature of bentonite is the formation of thixotrophic gels in the aqueous medium to enlarge its volume at 12–15 times of its dry bulk. When bentonite is …
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After purification and modification, the absorbent aluminum phyllosilicate bentonite clay can be used as an efficient catalyst in various types of catalytic reactions. Moreover, …
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As pointed out by Talmon et al. (2013), the penetration process of bentonite slurry in front of the face of shield tunnel is divided into two distinct stages: the mud spurt and the filter cake formation.They performed slurry penetration tests, comparable to the ones described later in this paper, applying a constant pressure on the slurry and …
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Four kinds of iron-based materials, i.e., iron-modified attapulgite, calcite, bentonite and dolomite (abbreviated as Fe-ATP, Fe-CA, Fe-BT and Fe-DOL, respectively) were prepared and used to immobilize the phosphorus in the system of overlying water (O-water) and sediment under the feed input condition, and their immobilization efficiencies …
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