One step acid activation of bentonite derived adsorbent for …
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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Surface area of bentonite modified with different acid …
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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Adsorption of humic acid on acid-activated Greek bentonite
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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Synergistic modification of bentonite by acid activation …
In this paper, we proposed a facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl iron pillaring, by which the adsorbent (abbreviated as S-Fe-BT) exhibited the highest adsorption capacity (246.06 mg/g) and a high rapid adsorption rate for a typical organic …
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Naturally occurring bentonite clay: Structural augmentation
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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Bentonite
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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Optimization and Characterization of Acid- Activated …
The aim of this study is the removal of lead from waste water resulted from battaries industries by adsorption using natural and acid activated bentonite clay. The response …
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Adsorption and Surface Area of Modified Bentonite Used …
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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The specific surface area of natural bentonite at differ- ent …
Natural bentonite was activated with 2 M sulfuric acid, 4.5 h and 95 °C (the best acid-activated sample with the highest adsorption capacity) and the other 6 M sulfuric acid, …
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Modeling and optimization process parameters of acid …
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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Characteristics of Raw and Acid-Activated Bentonite and Its …
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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Obtaining adsorbents from acid and acid-thermal activation of bentonite
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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TGA curves of raw and acid activated Jordanian bentonite.
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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Surface area of bentonite raw clay and acid activated clay
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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Adsorption of acid dyes from aqueous solutions onto acid-activated …
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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Catalytic conversion of limonene over acid activated Serra …
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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Synthesis and characterization of acid-activated bentonite …
Nano-MMT is the main content of bentonite [14, 15] that has unique properties because it has a very small particle size, resulting in a very high surface area [2,13]. Besides, with a very fine ...
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Preparation and characterization of acid-activated bentonite …
The specific surface area of natural bentonite is 57.6 m²/g while a maximum of 238.24 m²/g was observed for bentonite activated with 3 M H2SO4 activated for time period of 6 h.
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Simultaneous determination of cation exchange capacity and surface area
The variation of specific surface area determined by + adsorption with the R x O y % remaining in the powders after activations. Download : Download full-size image; Fig. 7. Pore size distribution curves of the natural and some acid activated bentonite powders obtained from nitrogen desorption data at 77 K (V: pore volume, r: …
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Naturally occurring bentonite clay: Structural augmentation
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 mesoporosity that can be applied as catalyst, adsorbent, catalyst support and high grade, low cost base material for zeolite synthesis.
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Characterization of activated bentonite clay mineral …
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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Thermal activation, characterization and performance …
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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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 enhanced surface …
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Surface properties of pillared acid-activated bentonite as …
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 effect of sulphuric acid activation on the crystallinity, surface …
The high increase in the surface area (122.3 m 2 g -1 ) and pore volume (0.0568 cm 3 g -1 ) of RDSBE-AH was possibly due to the acid reaction with the clay surface and the heating temperature ...
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Adsorption of humic acid on acid-activated Greek bentonite
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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N-2-BET specific surface area of bentonites | Request PDF
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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Amine grafting of acid-activated bentonite for carbon dioxide capture
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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Simultaneous determination of cation exchange and surface area of acid …
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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Amine grafting of acid-activated bentonite for carbon dioxide capture
The raw bentonite reached a CO2 uptake of only 6.2 mg/g ads due to its low specific surface area and pore volume. After acid modification, an increase in its specific surface area and pore volume ...
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