where k 1 (1/h) and k 2 (g/mg h) is the adsorption rate constant for the pseudo-first and pseudo-second order kinetic equation respectively, while a (mg/g h) is the initial sorption rate and b (g ...
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Therefore, the goal of this research is to assess the effect of pressure, composition and structure of bentonite clay on its adsorption by methylene blue. The experimental part of the research was performed in stages. Samples of bentonite clay were prepared, treated with pressure up to P = 800 MPa on a high-pressure device.
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The BET surface area analysis revealed that acid-activated bentonite (AAB) possessed more than two fold higher surface area as compared to NB. Combining pH zpc measurements, effect of solution pH and CIP speciation revealed that CIP sorption onto bentonite is highly dependent on solution pH. Kinetic studies confirmed that CIP …
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In recent decades, increased industrial, agricultural, and domestic activities have resulted in the release of various pollutants into the aquatic systems, which require a reliable and environmentally friendly method to remove them. Adsorption is one of the most cost-effective and sustainable wastewater treatment techniques. A plethora of low-cost bio …
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pfomrer anec 33. e use of inexpensive and abundant materials like activated carbon and bentonite clay helps keep costs low, while the composite's high adsorption capacity reduces the amount ...
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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 …
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The textural properties of acid-activated bentonite (AAB), which were prepared using four different concentrations of sulfuric acid, were analyzed by adsorption-desorption isotherm of nitrogen ...
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Over time, these deposits can be buried and subjected to various physical and chemical processes, such as compaction, cementation, and alteration, that transform them into clay minerals, including bentonite. The process of bentonite formation begins with the deposition of volcanic ash, which is composed primarily of glass shards and …
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The parent clay mineral exhibits an intense XRD reflection at 2θ = 7.06 degrees, corresponding to a basal spacing (d 001) of 12.5 Å, which decreases in intensity during acid activation, and no basal spacing (d 001) is observed for prolonged activation, indicating disordering of Mt layers in the c-direction.A low, intense, broad reflection in the 2θ range …
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A new process for manufacturing organically compounded bentonite was developed successfully based on the organic intercalation and layered structure of bentonite. The main steps in the proposed process included wet sodium activation of bentonite ore, organic compounding and high-pressure roll grinding. The optimum …
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This study aimed to investigate the characteristics of acid-activated bentonite by focusing on its capability of improving the quality of tap water used during wire electrical discharge machining. Raw bentonite (RB) was activated using sulfuric acid, nitric acid, and phosphoric acid solutions with c …
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WEBAcid 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 …
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The application of Rumex Abysinicus derived activated carbon/bentonite clay/graphene oxide/iron oxide nanocomposite for removal of chromium from aqueous solution
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Deposits of Bentonite are mostly exploited by mining. Having an approximately 30% content of moisture, the extracted Bentonite is noticeably solid. Initially, the material is sliced or crushed and activated by adding Na2CO3 (soda ash), if required. Afterward, Bentonite is dried using forced drying or the air to touch the required moisture.
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Bentonite activated at 200 °C showed higher CEC, however, lower specific surface area. For thermal treatment at the temperature of 400 °C and above, both the surface area and CEC were observed to be low for consideration. Hence, bentonite activated at a temperature of 300 °C for 6 h was selected for adsorption performance …
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Thermodynamic data on metal adsorption on clays are limited, with less still Fe 2+, Zn 2+, and Ni 2+ adsorption onto bentonite, and none on acid-activated bentonite. Yavuz et al. (2003) found that Δ H o, Δ S o and Δ G o for Cu 2+ adsorption onto Turkish kaolinite are 39.5 kJ/mol, 11.7 J/mol.K and −4.6 kJ/mol, respectively.
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Synthesis of Bentonite/hydroxyapatite composite. In a particular method, 0.5 g HAp and 0.5 g bentonite were added in different beakers (250 mL) containing distilled water and stirred at room ...
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The effects of global climate change are becoming more evident and accelerating at an unprecedented pace. For this reason, human activities urgently need a paradigm shift to stop this entropic process before the consequences become irreversible. In this sense, the use of highly eco-efficient materials aimed at conveniently neutralizing …
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The natural bentonite (NB) was activated to Na-bentonite (Na-B) by a new facile method within 2 h. NB and Na-B were also characterized using XRD, XRF, BET ESM, and FT-IR.
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The thus obtained acid-activated bentonite was dried in the oven for 5 h at a temperature of 373 K. ... and it indicates that the Si–O groups of bentonite may be involved in the process of dye ...
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The resultant activated clay was washed with distilled deionized water several times until it was free of chloride (Cl-) and sulfate (SO 4 2-) ions. Complete removal of Cl-and SO 4 2-ions were checked by the AgNO 3 and BaCl 2 tests. The acid-activated bentonite was then oven-dried at 80 °C for 4 h. 2.3. Al pillaring of bentonite
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The study reveals that bentonite clay has large surface area due to similar structure with montmorillonite and it is found that the functionality of bentonite can be increased by increasing total ...
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Thermodynamic data on metal adsorption on clays are limited, with less still Fe 2+, Zn 2+, and Ni 2+ adsorption onto bentonite, and none on acid-activated bentonite. Yavuz et al. (2003) found that Δ H o, Δ S o and Δ G o for Cu 2+ adsorption onto Turkish kaolinite are 39.5 kJ/mol, 11.7 J/mol.K and −4.6 kJ/mol, respectively.
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Pulverized leaves of Syzygium aqueum (water apple) are mixed with a universal solvent such as water for the preparation of Pd nanoparticle supported on activated Bentonite. The extract from the plant leaves acts both as a reducing agent and also as a capping agent for converting the PdCl2 to PdNPs.
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The effect of bentonite on body function Detoxification. Bentonite clay has been shown to act as a detoxifying agent. This property is referred to its poly-cationic nature, which leads to absorption of negative charge toxins ().T-2 is a trichothecene mycotoxin which is a naturally occurring mold byproduct of Fusarium fungus and is toxic …
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Water treatment is of paramount importance to ensure the availability of clean and safe drinking water. In recent years, clay-based materials have gained significant attention as promising adsorbents for water treatment applications. This review provides a comprehensive analysis of different clay types and their surface adsorption properties …
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Introduction. Clay, particularly bentonites (clay mineral with different colors) are very popular in various industries (Christidis, 2013).Bentonite, has been applied as adsorbent, bleaching earth, and catalyst, as well as in eutrophication management and remediation of pollutions (Önal, 2006; Jeenpadiphat and Tungasmita, 2014; Copetti et …
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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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The effect of contact time on the adsorption of cobalt by Saudi activated bentonite for different initial concentrations can be seen in Fig. 1.The effect of shaking time on cobalt adsorption was investigated by varying the contact time between the adsorbate and adsorbent in the range 2–60 min.The initial concentration of cobalt ranged from 20 …
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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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