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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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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.
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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 combination that is likely to be more preferable on an industrial scale was 100°C, 25% pulp density (w/v), 1m initial oxalic acid concentration, 60% recycling of the oxalate solution (making up an acid to bentonite ratio 0.2 w/w) and 6 h activation time.
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The aim of this study is to activate bentonite then to use it as a bleaching agent for edible oil. Sample of bentonite were obtained from Jabel Um Ali, North State of Sudan .X–ray fluorescence measurement was performed to determine the chemical composition of the raw clay. ... Two models for acid activation of the bentonites were developed by ...
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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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Specific properties of bentonite clay have made them a valuable material in different process industries. Easy availability, low price and their effectiveness are the major factors which made fuller's earth, an adsorbent in cooking oil manufacturing industry. Textural characteristics of fuller's earth play an important role in its performance. These …
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Download scientific diagram | FT-IR analysis of acetic acid treated clay from publication: Surface activation of fuller's earth (bentonite clay) using organic acids | Specific properties of ...
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To prepare acid activated Indian bentonite, the Indian bentonite was slurried with water and then mixed with conc. H 2 SO 4 (98%) at predetermined acid/clay ratio of 0.30 so as to form a clay slurry, which was heated on a water bath at 90 °C for 16 h with constant stirring (pH 1.84). At the end of the reaction time the activation was …
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The adsorbents, an organically activated bentonite (OAB) and a humic acid polymer (HAP), were tested in a common in vitro model with a pH course comparing the maximum pH changes that can be expected in the digestive system of a monogastric animal, i.e. pH 7.4 for the oral cavity, pH 3.0 for the stomach, and pH 8.4 for the intestines.
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Acid activation technique was opted for modifying natural bentonite (NB) to enhance the adsorptive removal of CIP from water. The BET surface area analysis …
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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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During thermal activation, water molecules, volatile organic compounds, and other impurities are removed with increasing temperature from the double-layer sheet of bentonite via a reversible ...
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The natural Egyptian bentonite was collected from El Alamein region and activated by acid activation (Ali et al., 2019) and alkali activation (Magzoub et al., 2017). Acid activation was done by ...
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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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It showed that organic acid from ryegrass root were oxalic acid, tartaric acid, malic acid, glacial acetic acid and citric acid. 0.1-1 mmol/L malonic acid and 2-3 ...
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The purpose of this study was to investigate the effects of solids concentration, salt concentration, and pH value on the shear rate, shear stress, and …
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Abstract. Environmental and health issues are critical challenges for sustainable development in the 21st century; therefore, this paper investigates a simple and cost-effective process for recovery of organic matter (OM) from phosphoric acid to provide environmentally acceptable P-fertilizer. This study analyzed the structural …
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Magnesium and to a lesser extend, aluminium are the most readily removed elements during acid modification. Similarly, bentonite activation is a complex phenomenon that involves the substitution of exchangeable cations, Al 3+, Mg 2+, and Fe 2+ against protons from the octahedral sheet, resulting in the improvement of bleaching …
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J. Phys. Chem. All Publications/Website. OR SEARCH CITATIONS
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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 ...
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Different organic (acetic acid, citric acids, and oxalic acid) and inorganic acids (HCL, H 2 SO 4, and H 3 PO 4 ) are used for acid activation (Avila et al. 2021;Javed et al. 2018;Kausar et al ...
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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, …
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The hydrochloric acid (HCl) (98%, = 1.98 g/cmd 3) and other used chemicals are of analytical grade. They were supplied by Merck Chemical Company. 2.2. Acid Activation The bentonite was prepared for activation by air-drying and grinding to a particle size of 0.075 mm. Twenty (20)
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The presence of emerging pollutants such as hazardous chemicals, pharmaceuticals, pesticides, and endocrine-disrupting chemicals in water sources is a serious concern to the environment and human health. Thus, this study focused on exploring the interaction mechanisms between ciprofloxacin (CIP) (antibiotic) and clay (a …
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19 research work is to give the alternative method for activation procedure of bentonite clay and 20 this method should be the safest method for both the labor and equipment used in vegetable 21 oil industry. 22 23 Index terms— bentonite clay; surface activation; organic acids; adsorption; fourier transform infrared 24 spectroscopy (ft-ir).
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Georgia Potsi, Athanasios K. Ladavos, Dimis Petrakis, Alexios P. Douvalis, Yiannis Sanakis, Marios S. Katsiotis, Georgios Papavassiliou, Saeed …
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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 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 …
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In the ironmaking process, the addition of an organic binder to replace a portion of bentonite has the potential to improve the performance of pellets. The interaction between original bentonite (OB) and organic binder was investigated. Results indicated that the micromorphology of organic composite bentonite (OCB) became porous and …
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is to give the alternative method for activation procedure of bentonite clay and this method should be the safest method for both the labor and equipment used in vegetable oil industry. Keywords: bentonite clay; surface activation; organic acids; adsorption; fourier transform infrared spectroscopy (ft-ir). GJRE-C Classification : FOR Code: 030599
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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 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 …
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The activation of bentonite results in an increase in the number of active sites, increase the pore volume, increase the surface area, etc. The major process of …
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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 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 ...
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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...
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The result shows the PB has the lowest removal efficiency as indicated in table 3; this may be during the purification of bentonite clay the organic matter is leached out and feldspar can be ...
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This paper reviews the progress in research of acid activation of clays, especially bentonites, for various applications. It covers the mechanisms, methods, …
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