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By means of characterization techniques, the present study determined that the activated bentonite composite presented a total specific surface area of ~360 m2 g−1, ~4 mmol of acid sites per ...
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The specific surface area, measured for the bentonite sample treated with water, was 28 m 2 /g and for the bentonite modified by MAT, of 213 m 2 /g, indicating a dramatic increase of more than 650%. This high value indicates a great potential of the MAT treated clay to be used as a bleaching clay [8, 12].The BET pore diameter …
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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 exchange capacity value of the raw bentonite was found to be 82.1 meq/100 g while the value was reduced to 67.2 meq/100 g for treated bentonite with high specific surface area.
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The optimum conditions to obtain the maximum specific surface area of acid-activated bentonite were as follows: temperature 90 °C, acid normality 4.5, stirring rate 450 rpm, solid-to-liquid ratio ...
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When fully expanded (after about 2–3 days in warm water), sodium bentonite has a surface area of about 700–800 m 2 /g. Swelling of bentonite ... Activated calcium bentonite is the most widely used bentonite in winemaking as it has a high swelling index and a pH of between 9 and 10. ... acid-activated Algerian bentonite showed faster ...
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Fig. 1 presents the specific surface areas of the activated bentonite by AA, TA and ATA. The surface area of the TA bentonite increased with the temperature increased up to 100 °C and then gradually decreased beyond 100 °C.Thermal activation under a high temperature can remove water molecules and other impurities.
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The specific surface area of acid-activated bentonite was estimated using the methylene blue adsorption method. The morphology of untreated, activated, and HA-sorbed bentonite was studied under scanning electron microscope (SEM). ... Acidic pH and high ionic strength proved to be favorable for the adsorption efficiency. Pseudo-first …
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The particles size distribution of H-bentonite range from 1.763 mm to 158.866 mm, while Fe-bentonite is 0.036–126.191 mm, the modification of bentonite with Fe enhances the surface area, pore ...
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Natural bentonite clay (mainly sodium-rich montmorillonite) both purified and acid activated using HCl, H 2 SO 4, and H 3 PO 4 acids were applied to the catalytic fast pyrolysis (CFP) of lignin. The modifications in crystalline structure and acidity of the activated clay were investigated via XRD, N 2-adsorption-desorption, FTIR, TGA and …
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Specific surface area of the original bentonite was measured by Brunauer, Emmett, and Teller (BET) method at 45 m 2 /g and was best improved after 5 N-acid activation (95-98°C, 2 h) reaching 68 m ...
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The adsorption of humic acid on bentonite from Milos Island (Greece) acid-treated with dilute H 2 SO 4 solutions over a concentration range between 0.25 and 13 M has been studied. Bentonite activated with 3 M sulfuric acid (AAS) showed a higher efficiency in removing humic acid from aqueous solutions and was selected for further …
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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 that acid-activated bentonite (AAB) possessed more than two fold higher surface area as …
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3.2 Characterization of raw and activated bentonite clays. The BET analysis of raw and treated bentonite indicated that the surface area was increased by treating raw bentonite with 0.5 M H 2 SO 4 whereas calcination reduced the pore surface area. Narrowing of the hysteresis curve of the adsorption isotherm (Fig. 1) was an …
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Acid activated bentonite exhibits an interesting pore volume and specific surface area. • Bentonite is used as an adsorbent for CO 2 capture before and after acid and amine modification.. The CO 2 uptake depends on the physicochemical properties of the adsorbent and the number and kind of amines loaded.. The aminopropyl …
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The results of material characterization showed that acid-activated bentonite has better properties than natural bentonite. For instance, the surface area of acid-activated bentonite elevated ...
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The purified bentonite exhibited a surface area of 130 m 2 g −1 which increased to values as high as 500 m 2 g −1 following activation with 4M HCl at 95 °C for 30 min (SD-4M-95-30). The ability of the activated samples to convert limonene to p -cymene was evaluated using a reaction time of 15 min at 80 °C.
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It was confirmed that acid treatment is an economical (∼ $400/t) and effective way of preparing environmentally benign porous activated clay having high surface area, pore …
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The response surface could indicate the optimal combination of parameters to obtain the largest specific surface area of the activated bentonite. The largest specific surface area from the various runs (Table 1), was 238 m2/g at a temperature of 90 °C, acid normality of 3 N, stirring rate of 300 rpm, solid-to-liquid ratio 1:6 and time of 3 h.
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The adsorption of humic acid on bentonite from Milos Island (Greece) acid-treated with dilute H (2)SO (4) solutions over a concentration range between 0.25 and 13M has been studied. Bentonite ...
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In Fig. 3a, the surface morphology of bentonite is a smooth surface with a fused and densely packed structure while the microstructure of HAp/bentonite composite revealed a rough and slightly ...
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Mar 2018. Khansaa Al-Essa. Jordanian bentonite was activated by hydrochloric acid at room temperature. FTIR, XRD, TGA, and BET surface area analyses of the samples were carried out to examine the ...
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The wide usefulness of clays is a result of their specific surface area, high chemical and mechanical stability, and variety of surface and structural properties. ... The dye molecules, AR57 and AB294 acid dyes, have such high affinity for the acid-activated bentonite surface that they are completely adsorbed from dilute solution. The surface ...
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Highlights New catalysts were prepared by acid treatment and pillaring of bentonite. Treatments generated materials with different surface characteristics. Specific surface area, pore volume and acidity of acid-activated pillared clay were enhanced compared to the parent clay. More than 98% of conversion was achieved in the …
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The evolution of surface properties, such as surface acid centres, porosity and specific surface area, in a bentonite from Almeria (Spain) after acid and heat treatments (0.25–2.00 N H2SO4 and 110–40°C) has been studied. The samples were characterized by mercury porosimetry and by X-ray diffraction. The number of surface …
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The optimum procedure is recommended as follows: 5 mass% of sodium carbonate powder and 30 wt.% water are added to activate the bentonite ore for 24 h to prepare activated bentonite; 0.5 wt.% of ...
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It was confirmed that acid treatment is an economical (∼ $400/t) and effective way of preparing environmentally benign porous activated clay having high surface area, pore volume and ...
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That means the acid attack enhanced the specific surface area of bentonite and created microporosity. The average value of the S (292 m 2 /g) of the activated bentonite proves the existence of a mesoporosity at the surface of samples. In the case of thermal activation, the calcination of bentonite at 100 or 200 °C affects the structure of ...
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In the study, acid-activated bentonite using sulfuric acid, nitric acid, and phosphoric acid solution was prepared, denoted as BS10, BN10, and BP10, respectively, and the adsorption capability of ions from tap water was assessed. The specific surface area and mesopore volume (2 < d ≤ 50 nm) of BS10, BN10, and BP10 exceeded those of RB. The ...
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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