Synthesis of Zeolite X from Bentonite via Hydrothermal Method
Zeolite X were successfully synthesized from bentonite from Lopburi province, in Thailand using the two-step of hydrothermal method under optimum condition without calcination. The first step of hydrothermal were obtained at 200 °C for 3 h to remove unreacted impurity minerals such as quartz and muscovite. The secondary step of hydrothermal were …
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The role of aluminium in alkali-activated bentonites
activation. The use bentonite as a possible source of alumino-silicates for alkaline cement manufacture is a new line of action, scantly documented in the literature. In one study …
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Frontiers | Potential of Acid-Activated Bentonite and SO3H
Application of acid-activated bentonite and SO3H-functionlized multiwall carbon nanotubes (SO3H-MWCNTs) for lowering free fatty acids (FFAs) content of low-quality residual olive oil, prior to alkali-catalyzed transesterification was investigated. The used bentonite was first characterized by Scanning Electron Microscopy (SEM), …
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Physico-chemical characterization of thermally treated bentonite
The further properties of bentonite like the adsorptive and catalytic properties, including acidic character of the smectites present, and their changes with heating are, undoubtedly, significant for the heated bentonite and their reactivity under the alkali activation [14], [15].
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Activation Iraqi bentonite for using as drilling mud
bentonite was treated with HCl first (Acid Activation) and then treated with NaoH (Alkali Activation). Rheological properties of alkali and acid activation I raqi bentonite are shown in Table 10 ...
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One-part alkali-activated materials: A review
Bentonite, another potential geopolymer precursor, usually consists mainly of the clay mineral montmorillonite, (Na,Ca) 0.33 (Al,Mg) 2 (Si 4 O 10)(OH) 2 ·nH 2 O. In alkali activation, however, bentonite shows a low reactivity as such [81], but it can be improved by thermal treatment at 550–850 °C [82], [83], [84].
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(PDF) Investigation of Used Motor Oil Regeneration
Goshica's (Kosovo) bentonite was activated with three activation methods, namely, acid, alkaline and combined acid-alkaline activation, and their regeneration efficiency of used motor oil (UMO ...
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Bentonite reactivity in alkaline solutions: interim results of …
However, bentonite is unstable under alkaline conditions and this has driven interest in low-alkali cements (leachate pH of 10–11). To build a robust safety case, it is important to have supporting natural analogue data to confirm understanding of the likely long-term performance of bentonite. In Cyprus, the presence of natural bentonite in ...
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The role of aluminium in alkali-activated bentonites
aluminiumintheoriginal bentonite intothe tetrahedral form, which is more prone to participate in alkaline activation. The use bentonite as a possible source of alumino-silicates for alkaline cement manufacture is a new line of action, scantly documented in the literature. In one study conducted by Mingyu et al. [21] to determine the
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Rheological Properties of Acid-Activated Bentonite …
Flow behaviour of Wyoming bentonite in water-alcohol. Clay Minerals, 29, 761–766. Google Scholar. Permien, T. and Lagaly, G. (1994b) The rheological and colloidal properties of bentonite dispersions in the presence of organic compounds: IV. Sodium montmorillonite and acids. Applied Clay Science, 9, 251–263.
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(PDF) Simultaneous thermal analysis of different bentonite …
A B S T R A C T: Alkali activation with sodium carbonates is a traditional method to improve bentonite properties for a variety of applications. In some applications, natural sodium-rich
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(PDF) Analysis of bentonite specific surface area by kinetic …
The properties of bentonite are function of Activation of bentonite by alkali and acid solutions is almost montmorillonite amount which determines quality of raw material important step in industrial scale. This process is carried out in a as well as the specific surface area [3].
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The role of aluminium in alkali-activated bentonites
In one study conducted by Mingyu et al. to determine the effect of adding bentonite during the alkali activation of fly ash, the clay was found to act as a mere …
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Recycling of Aluminosilicate-Based Solid Wastes through Alkali …
Recycling aluminosilicate-based solid wastes is imperative to realize the sustainable development of constructions. By using alkali activation technology, aluminosilicate-based solid wastes, such as furnace slag, fly ash, red mud, and most of the bio-ashes, can be turned into alternative binder materials to Portland cement to reduce …
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Use of clays in alkaline hybrid cement preparation. The role …
In addition to broadening the range of materials apt for experimentation with alkaline activation, using clay, to prepare HYC would lower the industry's environmental impact by reducing the amount of limestone needed for cement manufacture. This study determined: (i) the viability of using dehydroxylated bentonite-like clay to prepare hybrid ...
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Materials | Free Full-Text | Evaluation of Pozzolanic and Alkali
Alkali-activated cement (AAC) is a sustainable building material with low carbon emissions, but it has a growing demand for raw materials. In this study, the potential of low-purity modified calcium bentonite (CB) as a raw material for AAC was evaluated. The thermodynamic changes and pozzolanic properties of calcined CB were determined …
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(PDF) Influence of Alkaline Activation over Swelling and …
The alkaline activation processes we re carried out as follows: a 100g/L suspension of bentonite was prepared and kept under constant stirring, until it was …
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Preparation and characterization of acid-activated bentonite …
Abstract. The Kütahya calcium bentonite (CaB) from Turkey shows significant changes in crystal structure, chemical composition and porosity with H2SO4 activation realized by heating its acidic ...
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Effect of the Acidic and Alkaline Activation of …
A promising way of activating bentonite-like clays is alkaline activation. This technique is more versatile than acidic activation in terms of both obtaining more active sorbents and having lower requirements for the initial feedstock. Alkaline metal hydroxides and mix-tures of calcium hydroxide with salts of mineral acids (e.g., NaCl, Na 2 SO ...
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(PDF) Simultaneous thermal analysis of different bentonite…
KEYWORDS: activation, alkali, bentonite, carbonate, simultaneous thermal analysis, soda, anhydrous sodium carbonate. Uses of bentonites with high smectite contents that natural sodium bentonites of high quality are (>60 wt.%) include animal feed additives, litter, rare, and most bentonites may not meet the required desiccant clays ...
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The role of aluminium in alkali-activated bentonites
The reaction products and microstructures of alkali-activated calcined bentonite clay-limestone hardened pastes were analyzed using thermal, XRD, and …
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Effects of alkali on one-part alkali-activated cement synthesized …
A novel approach was employed to synthesize one-part alkali-activated cements (AACs) for potential property/cost ratio advantage by calcining low-quality bentonite with dolomite and Na2CO3.
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The role of aluminium in alkali-activated bentonites
The third reaction raised the solution pH, which in turn hastened dehydroxylated bentonite dissolution, favouring its alkaline activation and the formation of N-A-S-H-like gels [14] (or (N,C)-A-S ...
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Thermal activation, characterization and performance …
The effects of activation parameters (time and temperature) on its physiochemical properties and its performance for the removal of sodium ions from water were investigated. Bentonite activated for 6 h at 300 °C showed a maximum specific surface area of 81.74 m 2 /g while the raw one showed 57.6 m 2 /g. However, the cation …
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Rheological behavior of activated bentonite suspensions and …
In addition, studies on alkali activation of clay minerals showed a significant decrease in CEC value when soda additive was above 2.5 wt.%; it was determined that …
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Using alkali-activated dredge sludge ash-bentonite for
Request PDF | On Feb 1, 2023, Xinminnan Hui and others published Using alkali-activated dredge sludge ash-bentonite for low permeability cutoff walls: The engineering properties and micromechanism ...
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Synthesis of Zeolite of Type A from Bentonite by Alkali …
alumina (aluminum hydroxide) and bentonite was converted to highly reactive sodium silicate, sodium aluminate, and aluminosilicate by alkali fusion activation using Na 2CO 3 at high temperature ...
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Optimization of bleaching power by sulfuric acid activation of bentonite
The optimum conditions for the activation to obtain a BE having the same bleaching power (0.60) as Tonsil® Optimum Bleaching Earth for soybean oil were determined as x = 0.35, T = 100°C and t = 2 h.
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Activation of Jordanian Bentonite by Hydrochloric Acid …
3.1.4. Determination of BET Surface Area. The surface area of bentonite shows a significant increase with activation by acid. Measured values are 66.2 and 287.8 m 2 g −1 for raw and activated bentonite, respectively. Since this increase is a result of removing impurities, replacement of exchangeable cations, such as K +, Na +, and Ca …
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Rehydration Driven Na-Activation of Bentonite—Evolution …
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 Na 2 CO 3 of concentration corresponding to 0.5, 1.0, 1.5, or 2.0 cation exchange capacity (CEC) of clay, was investigated. Structural and compositional evolution of the …
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