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Abstract—A study is performed of the effect the means of activation of bentonite-like clays (acidic, alkaline, combined) have on the adsorption characteristics of Fe 3+ ions under static …
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This process is known as acid activation. The most significant mechanism in the activation of natural bentonite is cation exchange by H + ions (Babaki et al., 2008). These transformations in the ...
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The activation mechanism of typical bentonite powder with sulfuric acid was studied from variations in their surface area during the reaction. The surface area of activated samples at different activation temperatures and times were measured by methylene blue adsorption to quantify the effect of acid. The influence of activation time was investigated by …
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There are discussions in the literature about the factors that influence the sodium activation process and about the effect of this process on the properties of the activated …
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activation, the analysis data showed a significant change in the chemical composition in modified bentonite clay, compared to the raw bentonite clay. The acid activation of bentonite caused an increase in the amount of Si+4 and Ti+4; this increase could be attributed to the remobilization of cations in the octahedral or tetrahedral sites ...
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The purpose of this work is to prepare and characterize bentonite samples modified with different organic ammonium, discuss in detail the influence of the molecule configuration of organic …
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Raw bentonite (RB) was activated using sulfuric acid, nitric acid, and phosphoric acid solutions with concentrations of 1, 5, and 10 mol/L, respectively.
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In this work, the sodium salt induced activation of bentonite derived adsorbent at low temperature has been attempted.
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Toor et al. conducted thermal activation of bentonite in a muffle furnace in the temperature range of 50–500 °C for a predetermined time varying from 50 to 120 min. The maximum Congo Red adsorption was experienced when bentonite was activated at 100 °C for 20 min, and activated bentonite exhibited more than 20% increase in surface area with ...
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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 earths (BEs).The roles of each of the process variables, namely mass fraction of H 2 SO 4 (x) in the dried CaB and pure H 2 SO 4 mixture, heating temperature (T) and contact time (t), in the activation were tested.
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The activation mechanism of typical bentonite powder with sulfuric acid was studied from variations in their surface area during the reaction. The surface area of activated samples at different activation temperatures and times were measured by methylene blue adsorption to quantify the effect of acid. The influence of activation time was ...
WhatsApp: +86 18221755073
The sodium salt-assisted low temperature activation of bentonite (BB) was attempted. The unique features of the raw bentonite and BB were characterized with respect …
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It was investigated the lactic acid production by glycerol oxidation using % 1 Au/bentonite catalysts in alkaline medium. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath over a period of 4 h at 90 °C reaction temperature and atmospheric pressure. 1 wt% Au based bentonite catalysts were prepared by …
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The most significant mechanism in the activation of natural bentonite is cation exchange by H + ions. During the activation process, a considerable amount of cations were …
WhatsApp: +86 18221755073
Bentonites can be activated by various treatments. Acid activation affects the pH and porosity of the bentonites. The void volumes in the solid particles with internal widths of <2, 2–50 and >50 nm are called micropores, mesopores and …
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The study of the kinetics of adsorption showed that decolorization of maize oil is a first-order process which occurs in two steps: a first fast step with higher activation energy (25.6 kJ mol −1), indicating the influence of a chemical interaction between the pigment and the clay surface, followed by a second slow step with low activation ...
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A mechanism involving the adsorption of Cd (II), Ni (II), Co (II), and Fe (II) ions in Z_LTA at the α and β-cages has been proposed based using dynamic simulations. This mechanism aligns with experimental results, ... Rehydration driven na-activation of bentonite—evolution of the clay structure and composition. Materials, 14 (2021), ...
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Herein, the facile one step acid activation of bentonite derived functionalized adsorbent (AB) for the effective remediation of both ionic and non-ionic secondary pesticides, …
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Abstract—A study is performed of the effect the means of activation of bentonite-like clays (acidic, alkaline, combined) have on the adsorption characteristics of Fe 3+ ions under static conditions. The mechanism of the acidic and alkaline activation of montmorillonite is identified and found to depend on the concentration of the activating ...
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Activation of Bentonite clay using hydrochloric acid (HCl) [15,16], sulfuric acid (H 2 SO 4 ) [17, 18] and other acids [19,20] has been reported. Out of all acids, H 2 SO 4 is preferred mostly as ...
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The adsorption mechanism, which has been reported to occur partly by ion exchange releasing cations in the interlayer and basal plane surfaces, and partially via non-columbic interaction between the bentonite surface neutralized site and the adsorbed cation, is greatly governed by the changing surface polarity, compression layer, or ionic ...
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Bentonite is a very significant non-metallic clay mineral, mainly composed of montmorillonite. Due to that montmorillonite possesses plenty of adsorption sites in its interlayer space, outer surface, and edges, bentonite shows excellent adsorption and swelling property, cation exchange ability and chemical and thermal stabilities.
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Briefly, bentonite-based bismuth ferrite (BiFe/Bent for short) was firstly prepared via sol-gel method [27], and then A-BiFe/Bent was obtained through the mechanical activation of BiFe/Bent under the optimal activation conditions that have been obtained in the previous work [29]. Finally, A-BiFe/Bent used as catalyst was obtained for the ...
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Acid activation technique was opted for modifying natural bentonite (NB) to enhance the adsorptive removal of CIP from water. The BET surface area analysis revealed …
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