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Acid Activation an overview | ScienceDirect Topics
Acid activation is a common chemical modification of clays, usually bentonites, with a hot solution of a mineral acid (typically HCl or H 2 SO 4), and it is used for both scientific and industrial purposes. The aim is to obtain partly dissolved material of increased specific surface area, porosity and surface acidity. The product consists
Intrinsic affinity of acid-activated bentonite towards
19/04/2018· Influence of Si/Al ratio on bentonite specific surface area (a) FTIR analysis of acid activated bentonite samples revealed a marked decrease in the intensity of the absorption band at 3623 cm −1. This was attributed to a depletion of AlOH stretching vibrations, as a result of dealumination upon acid attack , , . Bentonite dealumination was also reflected by the disappearance, after acid
Adsorption of humic acid on acid-activated Greek
15/12/2009· 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). The effects of contact time, adsorbate concentration, adsorbent dose, and temperature on the adsorption of humic acid onto bentonite activated with 3 M
Frontiers | Potential of Acid-Activated Bentonite and SO3H
17/12/2018· Compared with natural bentonite, acid-activated bentonite displayed about 38–51% larger surface area (Table 1). It can be deduced from the BET data tabulated in Table 1, that the activation of bentonite with 5 N solution of H 2 SO 4 triggered the largest surface area. In another word, increasing acid concentration from 3 to 5 N had a positive
Frontiers | Potential of Acid-Activated Bentonite and
17/12/2018· Compared with natural bentonite, acid-activated bentonite displayed about 38–51% larger surface area (Table 1). It can be deduced from the BET data tabulated in Table 1, that the activation of bentonite with 5 N solution of H 2 SO 4 triggered the largest surface area. In another word, increasing acid concentration from 3 to 5 N had a positive
Adsorption of humic acid on acid-activated Greek
15/12/2009· 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). The effects of contact time, adsorbate concentration, adsorbent dose, and temperature on the adsorption of humic acid onto bentonite activated with 3 M
Activation of Jordanian Bentonite by Hydrochloric Acid
Bentonite has been successfully activated using hydrochloric acid, as shown by FTIR, XRD, and TGA studies, in addition to an increase in its surface area. Acid activated bentonite shows a great potential for the removal of heavy metal ions and phenolic compounds pollutants. Results show that percentage uptakes exceed 99% for Zn, Fe, and Mn ions. According to phenolic compounds, adsorption
Characterization of activated bentonite clay mineral and
10/06/2020· 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 compared to NB. Combining pHzpc measurements, effect of solution pH and CIP speciation
Bentonites paper tech product ACAT
The acid activated bentonite within the receiver layer reacts as a colour developer to a coloured final stage. Even small quantities of coating-bentonites provide a good coverage of paper surface. In coating formulations binder content can be reduced and the production of paper qualities for various printing methods is possible. Fast running paper machines require micro particle systems in
Acid activation of upper Eocene Ca-bentonite for soybean
The purified bentonite exhibited a surface area of 130 m 2 g À1 which increased to values as high as 500 m 2 g À1 following activation with 4M HCl at 95 8C for 30 min (SD-4M-95-30). The ability
Acid activation of Bentonite for use as a vegetable oil
Acid-activated clays are the most common bleaching agents for vegetal oils. Among them, activated bentonites are regarded in bleaching industries as references for removing chlorophyll, carotenoids, phospholipids, metals and oxidation products from oils. So far, the removal of these constituents has been explained only in terms of adsorption (Kheok and Lim, 1982; Taylor et al., 1989), but the
The effect of sulphuric acid activation on the
The BET surface area analysis revealed that acid-activated bentonite (AAB) possessed more than two fold higher surface area as compared to NB. Combining pHzpc measurements, effect of solution pH
(PDF) Alteration of Bentonite From Ughelli By Nitric Acid
The sulfuric acid activated bentonites exhibiting a lower cation exchange capacity (CEC) and а change of specific surface area (SBET) from 6 to 387 for bentonite from Petrovac and from 44 to 1784
Welcome to Star Bentonite Exports
STARBRITE High Performance Acid-activated bleaching earths are manufactured from selected high-quality Montmorillonite clays. The absorptive properties of these clays are enhanced by treatment with mineral acid, to increase the surface area and pore volume, prior to washing, drying and milling to the desired particle size distribution. For more info, please refer to www.starbrite. Star
Frontiers | Potential of Acid-Activated Bentonite and
17/12/2018· Compared with natural bentonite, acid-activated bentonite displayed about 38–51% larger surface area (Table 1). It can be deduced from the BET data tabulated in Table 1, that the activation of bentonite with 5 N solution of H 2 SO 4 triggered the largest surface area. In another word, increasing acid concentration from 3 to 5 N had a positive
The effect of sulphuric acid activation on the
The BET surface area analysis revealed that acid-activated bentonite (AAB) possessed more than two fold higher surface area as compared to NB. Combining pHzpc measurements, effect of solution pH
Response surface modeling of acid activation of raw
25/08/2013· Since acid-activated bentonites have more ability to bleach coloring low density and high surface area, which consists essentially of amorphous silica (SiO 2 ·nH 2 O). It is thus, an alternative material to other sorbents in processes such as wastewater treatment, in the removal of heavy metals such as Pb 2+, Cd 2+, Zn 2+ and Cu 2+. They have not been much documented in the
Acid activation of Bentonite for use as a vegetable oil
Acid-activated clays are the most common bleaching agents for vegetal oils. Among them, activated bentonites are regarded in bleaching industries as references for removing chlorophyll, carotenoids, phospholipids, metals and oxidation products from oils. So far, the removal of these constituents has been explained only in terms of adsorption (Kheok and Lim, 1982; Taylor et al., 1989), but the
Acid Activation and Its Characterisation of Gulbarga City
Scars method is used for determination of surface area of the raw clay and acid activated. Initially, 0.5g of bentonite clay treated with 0.05N hydrochloric acid to a pH 4-5 and 10g of sodium chloride is added to the 50ml volumetric flask and is diluted up to up to the mark with distilled water. The titration was carriedout with 0.05M sodium hydroxide in thermostatic bath at 298K. The volume
Acid activation of upper Eocene Ca-bentonite for
The purified bentonite exhibited a surface area of 130 m 2 g À1 which increased to values as high as 500 m 2 g À1 following activation with 4M HCl at 95 8C for 30 min (SD-4M-95-30). The ability
Structural Property Improvements of Bentonite with
The increase of the acid strength resulted in enhancement both in the surface area and acid sites up to 2 M concentration. For both Lewis and Brønsted acidities, significant increases occurred in addition to H-bonding to the structure. Keywords: Bentonite, acid activation, leaching, textural properties, surface acidity. Submitted: August 31, 2017. Accepted: April 24, 2018. Cite this: Balcı S
(PDF) Alteration of Bentonite From Ughelli By Nitric
The sulfuric acid activated bentonites exhibiting a lower cation exchange capacity (CEC) and а change of specific surface area (SBET) from 6 to 387 for bentonite from Petrovac and from 44 to 1784
Modified activated carbon and bentonite used to adsorb
AC is an effective adsorbent, has a high surface area, an . 162 Eman Abdelwahab Ema: Modified Activated Carbon and Bentonite Used to Adsorb Petroleum Hydrocarbons Emulsified in Aqueous Solution extensively developed pore structure, a high crystalline form and mechanical strength [12]. In addition, AC possesses good porous texture allowing the high adsorption capacity in the removal of a
Purification of Biodiesel by Adsorption with A ctivated
Its composition and surface area was characterized by XRF and BET techniques. The high performance of activated bentonite was obtained by activating natural low silica bentonite with 0.1 M H 2SO 4 at 100 0C for 1 hour. By using 5% of activated bentonite with 120-200 mesh size, 47% of glycerin could be removed, and the adsorption isotherm was fit with Freundlich isotherm. Activated low silica