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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 …
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Abstract. 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 …
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Acid activation of bentonite clay for recycled automotive oil purification. johanna aguilar. 2020, E3S web of conferences. See Full PDF Download PDF.
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7.1.9. Conclusion. Acid activation of clays and clay minerals was used for decades both in laboratories for basic and applied research and in industrial production for many applications. Even so, it still remains one of the most common chemical modifications of clays for the future of clay science and applications.
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Acid activation. The acid activation was carried out in a 250 mL breaker with 100 mL working volume. The samples were mixed properly in a rotary shaker (Ratek OM 15 orbital) at 100 rpm for 10 min. The raw bentonite was treated with HCl at a determined concentration of 0.05–0.5 M at 60–100 °C. The acid to clay ratio was 1:10 …
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Thermodynamic analysis illustrated that the adsorption process was feasible and exothermic in nature, while the characterization findings verified the alteration of FTIR bands. Herein, the facile one step acid activation of bentonite derived functionalized adsorbent (AB) for the effective remediation of both ionic and non-ionic secondary …
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In this paper, we proposed a facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl …
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PDF. Share. Tools. Abstract. Listen. Bentonite samples collected from M'Zila of Mostaganem (Algeria) were treated in first protocol with sulfuric acid at concentrations …
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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 ...
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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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A facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl iron pillaring is proposed, by which the …
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A. CALIMLI. 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 H 2 SO 4 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 …
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Abstract. 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 …
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The acid activation bentonites were suitable for decolorization of cottonseed oil through removing carotene and chlorophyll. The bleaching capabilities of different …
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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 …
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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 ...
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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 …
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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, acid normality, solid-to-liquid ratio and stirring rate) on the specific surface area, pore volume, pore diameter and bulk density of the activated …
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Therefore, acid activation of bentonite using sulfuric acid, nitric acid, and phosphoric acid solution constitutes a considerably useful technique for decreasing electrical conductivity in tap water. In comparison of the decrease in electrical conductivity among BS10, BN10, and BP10, the removal percentage was in the order BS10 < BP10 < BN10 ...
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Abstract. 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 ...
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The activation of bentonite clay for the use as oil decolorizing agent is conventionally carried out by a batch system with agitation in the boiling temperature of the acid solution, at atmospheric pressure (Foletto et al., 2006, Foletto et al., 2011, Rossi et al., 2003, Wu et al., 2006).
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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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The pHpzc for the acid-activated bentonite blended with the acid-activated SCBA used in this study was explained as per the solid addition method described by Aljeboree et al. (2017) . 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 …
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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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Acid activation is a modification technique that aims to produce partial dissolution of the adsorbent to enhance the adsorptive properties, surface...
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TGA curves of the Somas bentonite and the products of acid activation. ... Particulate Science and Technology, 28: 4, 298 — 308. To link to this Article: DOI: 10.1080/02726351.2010.496296.
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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 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, Shihezi 832003, …
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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%) …
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Abstract. 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 …
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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).
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