Acid activation produces partially dissolved bentonite, which exhibits better adsorption properties due to increased clay porosity, surface areas, and the number of active sites (Komadel 2016 ...
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In this study, the use of bentonite clay modified by acid activation is proposed. Sulfuric acid, acetic acid (v-acid/w-clay ratio=20, 40 and 60%) and sulfuric/acetic mixtures (1:1 ratio) were used ...
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2.2 Activation of bentonite clay Activation was done based study of Samira & Moussa, 2014; 400 mL of hydrochloric acid (2M HCl) (98%, d = 1.98 g/cm3) solution was added to 50 g of NB sample. The ...
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One step acid activation of bentonite derived adsorbent for the effective remediation of the new generation of industrial pesticides. Sci. Rep. 10, 1–13 (2020).
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The acid activation of an Algerian bentonite was investigated using a factorial 3 3 experiment design in order to improve the bleaching capacity in the colza oil processing. Optimized acid treatment of this bentonite gave rise to an effective bleaching earth in colza oil treatment. The 80 °C temperature value was regarded as being …
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The characteristics of acid-activated raw bentonite (RB) activated with binary acid solutions sulfuric acid + nitric acid, nitric acid + phosphoric acid, and phosphoric …
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Ningming bentonite purified by wet-way was used to do experiments. The effects of liquid-solid ratio, H 2SO 4 concentration, reaction time, reaction temperature and drying temperature on decolor ratio and activity were studied, the optimum technologic conditions were put forward based on above researches.
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In this work, a bentonite clay from Turkey (Somas bentonite) was activated with different concentrations of H 2 SO 4 and HCl at 70°–90°C and 5–8 h. Under these conditions several cations were removed from natural bentonite (Al, Mg, and Fe) and DTA-TGA and FT-IR curves of the solids obtained after acid treatment were examined.
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XRD spectra of the natural and the acid activated bentonite catalysts are given in Fig. 1.The natural bentonite cations such as sodium- rich Montmorillonite (NM), with the d (001) - value of 1–25 nm as the common mineral in clay, appears to be well crystallized.The most pronounced modifications occur in the Montmorillonite d (001) …
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Bentonite is widely used in industrial wastewater treatment due to its large reserves and excellent physicochemical properties. In order to further improve the properties of bentonite, natural bentonite needs to be modified before application. The common modification methods of bentonite include thermal activation, acid …
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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 …
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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 …
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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 …
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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. …
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Sulphuric Acid Activation of a Calcium Bentonite; of 14 /14. Match case Limit results 1 per page. This article was downloaded by: ... UK Particulate Science and Technology: An International Journal Publication details, including instructions for …
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It was observed that the bentonite had a maximum specific surface area of (562.88 m2/g) and cation exchange capacity (CEC) of (474.2 meq/100g clay) at 10% acid concentration. Bentonite cation ...
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Acid activation with HCl of two bentonites from the Aegean Islands of Milos and Chios, Greece, consisting of Chambers and Tatatilla-type and Otay-type montmorillonite, respectively, resulted in a 4 to 5-fold increase of the surface area of the raw materials. ... physical and chemical properties of the bentonite deposits of Milos Island, …
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Acid Activation of Bentonite Clay. The acid activation experiment were carried out in a laboratory size stirred bath reactor. 40gm of raw clay sample is taken in three different round bottom pyrex flasks. 11ml, 12ml and 14ml of sulphuric acid, phosphoric acid and nitric acid is taken in first, second and third pyrex flasks respectively.
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II.2.1. Acid activation. First, natural bentonite was grounded to pass through a 250 mesh sieve. Double ionized water was used to wash the bentonite to remove impurities, and the bentonite was dried at 60. o. C for 12 hours and then was grounded to pass through a 250 mesh sieve. Activation of acid samples were
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Bentonite has always had a multitude of markets and acid-activated bentonite was a traditional product for many decades. ... Acid activation of a Ca 2+-montmorillonite by treatment with sulphuric-acid ... (Eds.), Natural Microporous Materials in Environmental Technology, Kluwer, The Netherlands (1999), pp. 3-18. Crossref Google …
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Bentonite from the 'Bogovina' coal mine in Serbia, was characterized. The influence of acid treatment on its composition, as well as mathematical descriptions of this influence are reported. The purpose of this work was to correlate the concentration of the acid used for the treatment with the resulting bentonite composition.
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A natural bentonite obtained from Khorasan, Iran, was submitted to acid activation with sulphuric acid. Sample aliquots (5gr) were leached with 100 ml H 2SO 4 solutions of various concentrations ...
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Chinese J. Chem. Eng., 14(2) 25358 (2006) Characterization, Acid Activation and Bleaching Performance of Bentonite from Xinjiang* WU Zhansheng(^ t)a, LI …
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The preparation of acid modification of Bentonite clay photocatalyst was done by treated with series of acid concentrations (0.1M, 1M, 2M and 3M H 2 SO 4) under microwave irradiation.The prepared catalysts were characterized by Powder X-ray diffractometer (PXRD), Scanning electron microscopy (SEM), Brunner-Emmet-Teller …
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The FTIR spectra of the exchanged acid-activated bentonite (E–A-Bent) and the exchanged bentonite (E-Bent) are shown in Fig. 1, and compared with the natural …
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The Hançılı (Keskin, Ankara, Turkey) bentonite was activated with H 2 SO 4 by dry method at 97 °C for 6 h to obtain optimum parameters for imparting a maximum bleaching power towards soybean oil. The H 2 SO 4 content in dry bentonite-acid mixture was changed between 0% and 70%. The natural and activated samples were examined …
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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 …
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The FTIR spectra of the exchanged acid-activated bentonite (E–A-Bent) and the exchanged bentonite (E-Bent) are shown in Fig. 1, and compared with the natural bentonite (Bent). The E–A-Bent and E-Bent exhibit a new absorption peak at 1460 cm − 1 due to the C C asymmetric bending of the alkyl chains of TBHP present in the clay.
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Combined acid and thermal activation of bentonite Purified bentonite (5 g) was treated in 100 mL of 1N sulfuric acid solution under reflux condition at 70 °C for 4 h. The acid-activated bentonite was then separated from the liquid by centrifugation followed by thorough washing with distilled water.
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