Vijayakumar et al. (2009) evaluated acid-activated bentonite as a catalyst in the esterification reaction of the different carboxylic acid with alcohols or p-cresol. Acid activation of bentonite was carried out in concentrated H 2 SO 4 and characterized by FTIR, XRD, SEM, TGA, acid titration and BET surface area. Esterification was carried …
In this study, the adsorption of NH 3 gas on a bentonite from Ünye (Turkey) in its natural state and after acid treatments, was investigated experimentally at 298 K and up to 100 kPa. Bentonite was treated with HCl solutions of various concentrations (0.5–2.5 M) at …
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 ...
Powder Technology; View via Publisher. Save to Library Save. Create Alert Alert. Cite. Share. 124 Citations. Highly Influential Citations. 3. ... The objective of this work is to determine changes of surface properties of a bentonite after acid activation, using hydrochloric acid solutions (HCl) at room temperature. XRD, FX, FTIR, MEB, and BET ...
A white calcium bentonite (CaB) from the Kütahya region/Turkey was activated by heating it for 6 hours at 97°C in H2SO4 solution. The mass percentage of H2SO4 in the bentonite-acid mixture was ...
One of the most common chemical modifications of clay minerals, used for both industrial and scientific purposes, is their acid activation. This consists of the reaction of clay minerals with a mineral acid solution, usually HCl or H 2 SO 4.The main task is to obtain partly dissolved material of increased specific surface area, porosity and surface …
It is noteworthy that the 2M acid activated Bentonite clay modified electrode possess well defined redox peak with enhanced peak current compared to 0.1M, 1M and 3M acid activated Bentonite clay can be ascribed to its good photocatalytic activity. Fig.5 (B) shows typical EIS Nyquist plots of the acid activated Bentonite clay photocatalysts.
Bentonite clay was brought from El Fawakher village, Old Cairo, Egypt. Sulfuric acid (H 2 SO 4) of 98% purity and lead nitrate were purchased from Qasr Al Aieny Street. B.Methods 1.Activation Using Sulfuric Acid Reflux Method 10 gm of raw bentonite clay was mixed with various concentrations of sulfuric acid 25, 35, and 45%. The reactants
A known amount of (0.1 g) of acid-activated bentonite blended with acid-activated SCBA was added to 200 mL of 0.1 M of NaCl solution at a pH range of 2–12 adjusted by 0.1 M NaOH or HCl. The blended adsorbents and sodium chloride mixture were placed in a thermoline scientific orbital shaker incubator at a speed of 130 rpm for 24 h.
In this paper, we proposed a facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl …
Laboratory of Soft Technology, Recovering, and Sustainable Development, Faculty of Science, ... Acid Activation The bentonite was prepared for activation by air-drying and grinding to a particle ...
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 ...
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 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)
The Kütahya calcium bentonite (CaB) from Turkey shows significant changes in crystal structure, chemical composition and porosity with H 2 SO 4 activation realized by heating its acidic aqueous suspension at 97 °C for 6 h. The acid content was changed from zero to 70% by mass, based on the dry bentonite–acid mixture.
Chinese J. Chem. Eng., 14(2) 25358 (2006) Characterization, Acid Activation and Bleaching Performance of Bentonite from Xinjiang* WU Zhansheng(^ t)a, LI Chun(^#) a'c'**, SUN Xifang(^*^)a, XU DAI Bin(ft $)a, LI Jin'e(*&$)a and ZHAO Hongsheng *i * b 1 School of Chemistry and Chemical Engineering, Shihezi University, …
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). Despite the fact of natural …
In this paper, we proposed a facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl …
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 …
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 variable and their levels selected for the acid activation of bentonite were: temperature (63–97 °C); acid normality (2–7 N); stirring rate (200–700 rpm); solid-to-liquid ratio (1:2.3–1:7) and time (0.34–3.66 h). ... Engineering and Technology. Optimization of Color Pigments Removal from Palm Oil by Activated Ukpor Clay Using ...
2.2.1. Activation of natural bentonite Activation of natural bentonite was carried out in laboratory conditions under the following selected parameters: 1. Sulfuric acid concentration: 15%. 2. Hydrochloric acid concentration: 15%. 3. The ratio of bentonite and acid is 1:2.5. 4. Temperature: 100°C. 5. Activation time with intensive stirring: 2 ...
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 …
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).
In this study, the adsorption of NH 3 gas on a bentonite from Ünye (Turkey) in its natural state and after acid treatments, was investigated experimentally at 298 K and up to 100 kPa. Bentonite was treated with …
2.2 Activation of bentonite clay and characterization. Sulfuric acid activation was carried out by treating 150 g of raw bentonite clay with 0.1 M and 0.5 M H 2 SO 4 at 50 °C for 1 h with continuous stirring. The activated bentonite clays were washed with distilled water till a pH of 6–7 was attained and dried in an oven at 105 °C for 12 h.
Measurements of Yellow and Red colors of the oils (bleached and unbleached) were performed on a Lovibond Tintometer (Model E–AF 710-2) using a 51/4 inch cell (European Journal of Lipid Science and Technology, 2001). 2.2. Acid activation A fine bentonite suspension in water (320 g dry clay per liter) was put in contact with pure H2SO4 (98%) …
The Kütahya calcium bentonite (CaB) from Turkey shows significant changes in crystal structure, chemical composition and porosity with H 2 SO 4 activation realized by heating its acidic aqueous suspension at 97 °C for 6 h. The acid content was changed from zero to 70% by mass, based on the dry bentonite–acid mixture. It was estimated from …
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 …
