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, ametryn and ...
Acid activation is a chemical treatment traditionally used on clays, typically bentonites in hydrochloric or sulphuric acid, to obtain partly dissolved materials with …
Dialkylated diphenylamine, renowned for its exceptional thermal stability and antioxidant activity, are extensively used as antioxidants. Raw bentonite after acid-treatment was carried out and the catalytic performance of various solid acid catalysts was tested, and acid-treated clay exhibited the best. In addition, the relationship between …
The acid activation bentonites were suitable for decolorization of cottonseed oil through removing carotene and chlorophyll. The bleaching capabilities of different pigments with activated bentonite with treatment of 25% sulfuric acid were 70.3%, 73.1%, 83.2%, 81.8% and 88.9%, respectively.
The effect of acid activation on the textural properties of a bentonite from Serbia was investigated using response surface methodology. The influence of activation parameters (temperature, time ...
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 dye, Rhodamine ...
The acid and thermal activation of bentonite affects the structure of clay minerals, especially montmorillonite and kaolinite. Therefore the specific surface area …
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 structure of bentonite before and after acid activation. It is found that the octahedral cations were removed, which altered the chemical composition of the …
The increase in the surface area for the activated bentonite clay can be the result of the splitting of clay particles and the opening up of the edges of the clay platelets due to the acid activation [12].
Toor et al., 2015 reported removal of congro red by using thermal activation (TA), acid activation (AA), and combined acid and thermal activation (ATA) bentonites …
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 of 5 mol/L (denoted as 5-SN, 5-NP, and 5-PS), were evaluated. Moreover, its application for improving the electrical conductivity …
It was determined that sulfuric acid and the sulfuric/acetic activations presented a similar bentonite structure transformation, which appears in the cations leaching of intermediate layer.
With the aforementioned, in this work, the sodium salt-assisted low temperature activation of highly porous bentonite derived adsorbent (BB) was carried out by varying the modification ratio.
Abstract. The Kütahya calcium bentonite (CaB) from Turkey shows significant changes in crystal structure, chemical composition and porosity with H2SO4 activation realized by heating its acidic ...
The acid activation of bentonite from Middle Anatolia, consisting of mostly montmorillonite, with a hot solution of H 2 SO 4 with different concentrations was carried out. SEM images, nitrogen sorption isotherms and FTIR spectra were used to examine structural changes of the bentonite with acid activation. Acid–base titration method …
The common method of bentonite modification is surface-active substance activation through ion-exchange reaction [4,5] and acid activation [6, 7]. These methods are very expensive and unfriendly ...
The quantitative XRD analysis demonstrated that the bentonite sample was composed predominantly of smectite (75%), with abundant feldspar (20%) and minor opal-CT, analcime and quartz (5%). …
The acid-activated bentonite acted as a solid acid catalyst due to the hydrogen ions already anchored among its smectite's layers during the activation process.
A facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl iron pillaring is proposed, by which the adsorbent exhibited the highest adsorptive capacity (246.06 mg/g) and a high rapid adsor adaptation rate for a typical organic dye, Rhodamine B (RhB).
The acid activation bentonites were suitable for decolorization of cottonseed oil through removing carotene and chlorophyll. The bleaching capabilities of different pigments with activated bentonite with treatment of 25% sulfuric acid were 70.3%, 73.1%, 83.2%, 81.8% and 88.9%, respectively.
The results show that acid activation leached out the Ca 2+ and Mg 2+ ions and increased the porosity of bentonite, thus elevating the adsorption capacity to 149 mg/g. Chinoune et al. (2016) prepared Mg (OH) 2 coated bentonite and found it is efficient for adsorption treatment of reactive blue 2 and reactive blue 19.
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 …
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, ametryn and metolachlor has been attempted. The surface characteristics of AB ...
Acid 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 …
Acid-activated bentonites are utilized in many applications, including those that depend on their rheological properties and behavior, but little information is available regarding the rheological characteristics of this important industrial material. The purpose of this study was to investigate the effects of solids concentration, salt concentration, and …
The objective of this work was to determine the changes of thermal and surface properties of a bentonite from Çankιrι after activation using different concentrations of H2SO4 solutions (0.5–4 M). XRD, FTIR, DTA, and TG analyses of the samples were performed to examine the structural changes of the bentonite before and …
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 properties suitable for new applications or displaying interesting new behaviour. This paper is based mostly on the results of long-running experiments in our ...
Activations of Ethiopian, Hadar bentonite clay were modified by using hydrochloric acid to Hydrochloric acid to was used to enhance the activated Hadar bentonite clay to be utilized in different ...
Acid 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 …
The design of various experiments in order to assess and simulate the effects of the acid activation of an Algerian bentonite on the bleaching capacity of Colza oil is described. Three key parameters of the acidic activation, namely acid concentration, contact time and temperature, were considered. The calculations made indicated that all ...
In fact, the combination of the three treatments (acid-activation, silylation and cationic exchange) gave place to the modified bentonite with the biggest basal spacing and the lower equilibrium water uptake percentage.
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.
Acid activation was carried out by heating muds prepared from Ca-rich bentonite (CaB), sulfuric acid (H2SO4) and distilled water, yielding various bleaching earths (BEs). The roles of each of the process variables, namely mass fraction of H2SO4 (x)
Natural bentonite grounded from Sarolangun District of Jambi Province has been modified based on Thermal and Acid Activation (TAA). The thermal activation was conducted by calcination at ...
Abstract. Acid activation was carried out by heating muds prepared from Ca-rich bentonite (CaB), sulfuric acid (H2SO4) and distilled water, yield-ing various bleaching earths (BEs). The roles of each of the process variables, namely mass fraction of H2SO4 (x) in the dried CaB and pure H2SO4 mixture, heating temperature (T) and contact time …
For effective examination of the impacts of acid activation by mineral acids on the crystalline structure and acidity of the bentonite clay (Montmorillonite), the following characterizations were done.
The acid values for BD-1 increased with the increase in concentration of acid for activation of bentonite clay and dosage of adsorbent used for dry washing. The acid values of biodiesel purified with raw bentonite, calcined bentonite, and Magnesol were in the limit of ASTM standards.
