Effect of the Acidic and Alkaline Activation of Bentonite …
acidic activation of clay while preserving the structure of its minerals is especially relevant. 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.
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Preparation and Characterization of Acid-Activated Bentonite …
The characteristics of acid-activated raw bentonite (RB) activated with binary acid solutions sulfuric acid + nitric acid, nitric acid + phosphoric acid, and phosphoric acid + sulfuric acid, at a concentration of 5 mol/L (denoted as 5-SN, 5-NP, and 5-PS), were evaluated. Moreover, its application for improving the electrical conductivity in tap water …
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Effects of Bentonite Activation Methods on Chitosan
Effects of Bentonite Activation Methods on Chitosan Loading Capacity Tao Yu1, Chengtun Qu2*, Daidi Fan1, Renjun Xu3 1School of Chemical Engineering, Northwest University, Xi'an 710069, P.R. China
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Acid activated clays: Materials in continuous demand
Acid activation is a chemical treatment traditionally used on clays, typically bentonites in hydrochloric or sulphuric acid, to obtain partly dissolved materials with …
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Activation of (Na, Ca)-bentonites with soda and MgO and …
1.. IntroductionBentonite often contains > 80% montmorillonite.Bentonite is used in a wide range of applications including drilling mud, bleaching earth, water and solvent based rheological additives, litter, desiccant clay, and animal feed additive (Lagaly, 2006).Due to high viscosity and swelling and low filtration loss, (Na–Ca) …
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Simultaneous thermal analysis of different bentonite…
Alkali activation with sodium carbonates is a traditional method to improve bentonite properties for a variety of applications. In some applications, natural sodium-rich bentonites are preferred, and custom regulations require proper declaration of Na-rich bentonites, with respect to activation.
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Synergistic modification of bentonite by acid activation …
Chinoune et al. (2016) prepared Mg(OH) 2 coated bentonite and found it is efficient for adsorption treatment of reactive blue 2 and reactive blue 19. The iron-pillared bentonite was also prepared by ion exchange using natural bentonite, with which the adsorption capacity of 98.6 mg/g for RhB was obtained.
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Activated Bentonite Nanocomposite for the Synthesis of …
Activated bentonites are low-cost acid catalysts used in several reactions. However, their application at an industrial scale is affected by the formation of colloidal suspensions when these bentonites are in aqueous solutions. In order to overcome these limitations, this work proposes obtaining a catalyst based on a composite containing …
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Acid activated clays: Materials in continuous demand
1. Introduction. One application of calcium bentonite with a significant market is the decolourization of vegetable, animal and mineral oils. Most of the calcium bentonite used for filtering and decolourizing oils is acid activated (Odom, 1984).Acid treatment with sulphuric or hydrochloric acid removes the calcium cations from the surfaces and edges …
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Optimized Bentonite Clay Adsorbents for Methylene Blue …
This study addresses the urgent need for effective water treatment methods by synthesizing and characterizing activated bentonite clay (ABC) adsorbents to remove methylene blue () from aqueous solutions efficiently. Conventional adsorbents often exhibit limitations in efficiency and regeneration capabilities, necessitating novel …
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Bentonite in two-component grout applications
Activation time of bentonite plays an active role in the bleeding reduction. ... This test method permits the evaluation of the swelling properties of a clay mineral. Briefly, after a dried phase, 2 g of bentonite are added to 90 mL of distilled water with step of 0.1 g every 10 min. Once the bentonite adding phase is ended, the water is ...
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US3240616A
Example 1 To 500 kg. of bentonite clay, 15.5 kg. of Na CO dissolved in 100 liters of water were introduced. The two latter agents constituted the activator. The solution of the activator was poured on the material which was placed on a belt-type unloading conveyor associated with a multibucket excavator and leading to the steel trucks of a narrow-gauge railway …
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Insights on applications of bentonite clays for the removal of …
In acid activation using inorganic acid, the inorganic cation in the interlayer structure of bentonite is supplanted by the monovalent hydrogen ion. In addition, octahedral ions (Fe …
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Structural Property Improvements of Bentonite with Sulfuric …
The acid activation of bentonite from Middle Anatolia, consisting of mostly montmorillonite, with a hot solution of H 2 SO 4 with different concentrations was carried out.
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A systematic and comprehensive study of Eco-friendly bentonite …
Vijayakumar et al. (2009) evaluated acid-activated bentonite as a catalyst in the esterification reaction of the different carboxylic acid with alcohols or p-cresol. Acid activation of bentonite was carried out in concentrated H 2 SO 4 and characterized by FTIR, XRD, SEM, TGA, acid titration and BET surface area. Esterification was carried …
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Optimization of bentonite clay mechano-chemical activation …
The efficiency of bentonite activation was assessed by chemometrics and Artificial neural networks mathematical modeling. Principal component analysis and analysis of variance were used in the observation of the influence of input variables (bentonite chemical composition) and process parameters (milling duration, rotor velocity) on the …
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Development and Characterization of Na2CO3-Activated …
A calcium bentonite clay from Boane region (Mozambique) was subjected to an Na2CO3 activation process. The methylene blue test together with energy-dispersive X-ray spectroscopy (EDX) analysis indicated the successful ion exchange of Ca2+ by Na+ ions since the cation exchange capacity (CEC) increased from 67.5 to 74 meq/100 g …
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Bentonite Supplier & Wholesale in Oman (Spec, Order, …
Get the Bentonite wholesale price, catalog, specification and put your order for premium quality products from Bentonite experienced exporter. Homepage [English] ... Oman. WhatsApp: +96898254446. Phone: +96822678677, +96898254446 Email: info@arijco Web: arijco. Do you need Bentonite? contact us: Your Name (required) Your Email …
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(PDF) Thermal and Acid Activation (TAA) of Bentonite as …
The result of the structural analysis showed that during the activation process, the structure of bentonite was not changed significantly and the surface area of the activated bentonite has ...
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Modification of bentonite clay & its applications: a review
Bentonite clay is one of the oldest clays that humankind has been using from ancient times as traditional habits and remedies. In recent years researchers have found many applications of bentonite ...
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Activated bentonite clay–based dry-wash purification of …
Biodiesel obtained by transesterification of vegetable oils and fats is an alternative for petro-diesel fuel. Purification of biodiesel is one of the crucial steps in the production of biodiesel. The conventional wet washing of biodiesel involves huge quantities of water, energy, and time. Therefore, dry washing was carried out with raw bentonite …
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Characterization of activated bentonite clay mineral and the mechanisms underlying its sorption for ciprofloxacin from …
A systematic and comprehensive study of Eco-friendly …
WEBAcid activation of bentonite was carried out in concentrated H 2 SO 4 and characterized by FTIR, XRD, SEM, TGA, acid titration and BET surface area. …
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Thermal and Acid Activation (TAA) of Bentonite as …
2.2 Methods 2.2.1 Natural bentonite activation Natural bentonite activation was performed by a two-step procedure based on the work done by Toor et al. [28], thermal activation followed by acid activation. Thermal activation was conducted by heating the sample using muffle furnace at 400 °C for 3 hours then cooled and stored
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Optimization of bleaching power by sulfuric acid activation …
Acid activation was carried out by heating muds prepared from Ca-rich bentonite (CaB), sulfuric acid (H 2 SO 4) and distilled water, yielding various bleaching …
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Pristine and activated bentonite for toxic metal removal from
Natural bentonite clay (NBC) was activated using nitric acid (HNO 3). Characterization techniques including FTIR, SEM, XRD and BET were employed to …
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The effect of acid activation on some physicochemical
A white calcium bentonite (CaB) from the Kütahya region/Turkey was activated by heating it for 6 hours at 97°C in H2SO4 solution. The mass percentage of H2SO4 in the bentonite-acid mixture was ...
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Influence of acid activation on the NH3-adsorption …
In this study, the adsorption of NH 3 gas on a bentonite from Ünye (Turkey) in its natural state and after acid treatments, was investigated experimentally at 298 K and up to 100 kPa. Bentonite was treated with HCl solutions of various concentrations (0.5–2.5 M) at …
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Activation of Bentonite Clay with H 2 SO 4 and Study It's …
A bentonite from Kirkouk city region (Iraq) was activated with H 2 SO 4 at various ratios (5, 10, 15, 20 %). Due to ion exchange, the original (Ca, Mg, Na, K)-bentonite was converted to H ...
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(PDF) Influence of Alkaline Activation over Swelling and …
The performance of the alkaline processes on the properties of cation exchange capacity (CEC) and swelling was studied in three different types of bentonite from Brazil, Argentina and Mozambique.
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Characterization of activated bentonite clay mineral and …
The presence of emerging pollutants such as hazardous chemicals, pharmaceuticals, pesticides, and endocrine-disrupting chemicals in water sources is a serious concern to the environment and human health. Thus, this study focused on exploring the interaction mechanisms between ciprofloxacin (CIP) (antibiotic) and clay (a …
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