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). ... [6,7], can be reasonably used in order to remove humic acid from water. Activated carbon exhibits a …
It was confirmed that acid treatment is an economical (∼ $400/t) and effective way of preparing environmentally benign porous activated clay having high surface …
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.
Acid treatment of clay is necessary for the activation of clay-based catalysts (Marosz et al., 2020).
The specific surface area of WCa-B treated with 1.0 M H 2 SO 4 increased approximately five times compared to non-treated bentonite (493 m 2 /g) and reached the highest value. The surface area of the acid-activated bentonites at the lowest concentrations also increased by an average of 2–2.5 times.
Bentonite has always had a multitude of markets and acid-activated bentonite was a traditional product for many decades. ... Study of the porous solids obtained by acid treatment of a high surface area saponite. Journal of Porous Materials, 6 (1999), pp. 335-344. View in Scopus Google Scholar.
The number of and Bronsted acid sites was strongly increased by intercalating of aluminum polyhydroxyl into the acid treated samples. Pillaring also improved micropore volume and consequently specific surface area of the samples. Pillared acid-activated bentonite was used for alkylation of benzene with 1-decene in liquid phase conditions.
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 …
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.
Within this framework, bentonite, the dual-charge phyllosillicates particles originating from the alteration of glassy substances of igneous origin, with a high specific …
Activated carbon (AC) has been widely used in food, medicine, air and water pollution control and other fields [1,2,3,4,5,6,7,8,9].Due to its good physical and chemical properties such as high mechanical strength, high specific surface area and chemical stability, AC becomes the most popular adsorption material, which can remove …
Acid activation is a chemical treatment traditionally used on clays, typically bentonites in hydrochloric or sulphuric acid, to obtain partly dissolved materials with …
bentonite showed good adsorptive properties and thermal stability. The analysis revealed that there is a rise in the specific surface area of the activated bentonite clay compared to that of the raw bentonite clay (from 41.7065 to 49.227 m²/g). Keywords-Acid-Activated, Bentonite, Modeling I. INTRODUCTION
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 ...
Semantic Scholar extracted view of "The effect of sulphuric acid activation on the crystallinity, surface area, porosity, surface acidity, and bleaching power of a bentonite" by H. Noyan et al. ... Preparation and characterization of acid-activated bentonite powders. M. Önal Y. Sarikaya. Materials Science, Environmental Science. 2007; 124.
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, 7.5 h and 95 °C ...
It was reported that the polymeric composite beads prepared using alginate have specific characteristics such as high porosity, high surface area, high affinity in charged molecules, high ...
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 …
It was believed that a structural change in the clay surface, to improve a specific surface area and also decrease negative charges of the adsorbent surface after treatment with acid, had an important role in increasing adsorption capacities of modified clay for adsorption of different anions, such as phosphate, from solution (Ye et al. 2006).
The physico-chemical behavior of Iranian typical bentonite was characterized during the activation process by sulfuric acid.
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 ...
The measured PZC values offer a good indication for activated bentonite by HCl. Indeed, the surface area measurement and PZC studies are consistent with previous results, thus supporting the consideration that the bentonite is activated by acid. 3.1.6. Characteristics of OMWW
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 ...
The intercalation of sodium salt into the bentonite surface give rise to the specific surface area and total pore volume from 120.34 to 426.91, m2/g and 0.155 to 0.225 cm3/g, respectively ...
It can be observed that compared to parent bentonite, the acid treated bentonite shows better textural properties considering large surface area and pore volume with high fraction of mesopores. This structurally enhanced bentonite clay is suitable to be applied as catalysts in esterification reaction [6], oxidation reactions [21], photo Fenton ...
The author reported that an increase in acid concentration greatly increased the specific surface area of the activated bentonite clays from 63.4 m 2 g −1 to 202 m 2 g −1. They observed the maximum specific surface area of activated bentonite was obtained when the temperature and acid concentration increased simultaneously.
This model is useful for setting an optimum value of the activation parameters for achieving the maximum specific surface area. An optimum specific surface area of 142 m2g−1 was achieved with an acid concentration of 5.2 M, activation time of 7.4 min, and microwave power of 117 W.
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 …
The Hançılı (Keskin, Ankara, Turkey) bentonite was activated with H2SO4 by dry method at 97 °C for 6 h to obtain optimum parameters for imparting a maximum bleaching power towards soybean oil.
It has a cation- exchange capacity of 82 meq/100g and a specific surface area by using surface area analyser and N2 gaz was used as adsorbate under atmosphere of 35 m2/g.the structural formula ...