— 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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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 …
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— Two bentonite clays with different mineralogical compositions from Mendoza, Argentine, were activated with H2SO4 solutions of 4 and 8 N at 90ºC for 3.5 hours.
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— The loss at 500 °C is hydroxyl water associated with acid activated Indian bentonite's structure. Between 500 and 700 °C, an additional amount of water is lost. There is negligible weight loss above 700 °C. 3.1.3 SEM of IB and AAIB. Figure 4 shows SEM pictures of Indian bentonite and acid activated Indian bentonite. The particle size of ...
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— Acid activation is a chemical treatment traditionally used on clays, typically bentonites in hydrochloric or sulphuric acid, to obtain partly dissolved materials with …
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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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— Bentonite, supplied by Sigma-Aldrich was applied as the raw precursor in this work. The acid modification was conducted by properly mixing bentonite with 8 M of nitric acid at 75 °C and 100 rpm. The modification process was terminated by the addition of a large amount of de-ionized water.
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— Two bentonite clays with different mineralogical compositions from Mendoza, Argentine, were activated with H2SO4 solutions of 4 and 8 N at 90ºC for 3.5 hours.
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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 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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Chiang Mai J. Sci. 2018; 45(4) 1773 in a desiccator for one night. The acid activation was performed using H 2 SO 4 0.1 M with bentonite to acid ratio was 1:5 (g mL-1). The activation process was ...
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— The reduction in some intensity with width increase to another spectrum peaks at 24.1 clearly shows that the activation process has significantly affected the bentonite clay crystalline structure ...
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— In our earlier work, the performance of acid-treated bentonite for the removal of sodium from water was reported (Musie & Gonfa 2022). Chemical activation methods using acid or alkali may leave chemical residue and cause environmental problems (Barakan & Aghazadeh 2021).
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July, 2009 Physico-chemical variation in bentonite by sulfuric acid activation 983 activation process was performed in the presence of 5 M sulfuric acid at 90 oC. It is observed that the specific surface area increases progressively with activation time until a maximum value and then drops considerably, which indicates that the crystal ...
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— A model developed for acid dissolution thermodynamics of a Turkish bentonite. Journal of Thermal Analysis and Calorimetry 2008, 94 (2), 591-596. DOI: 10.1007/s10973-007-8788-y. Müşerref Önal, Yüksel Sarıkaya. Preparation and characterization of acid-activated bentonite powders.
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— The preparation of acid-activated RB using binary acid solutions (sulfuric acid + nitric acid, nitric acid + phosphoric acid, and phosphoric acid + sulfuric acid for 5-SN, 5 …
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Hence, using inorganic acid of moderate strength is the most effective mode of surface activation (Khan 2015). However, the acid activation process is slow; therefore, agitation, retention time, and temperature are crucial factors in improving the activated clay quality. The convenient temperature for acid activation is 30 to 70 °C.
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Raw clay was activated via various treatment methods including acid activation, cation treatment and thermal treatment. Structural changes caused by acid activation were characterized using Fourier transform infrared spectroscopy, differential thermal analysis, N 2 adsorption (BET surface area), X-ray fluo-rescence and scanning electron microscopy.
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— The result of the structural analysis showed that during the activation process, the structure of bentonite was not changed significantly and the surface area of the activated bentonite has ...
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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 ...
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purification has become a topic of research. 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 in the bentonite clay activation. The activated clays were used in the UMO
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— Activation of bentonite by acid is an important step for adsorption of some impurities by active clay [6]. This is so-called "activation process". The activation of bentonite is carried out in a continuous stirred tank reactor at low temperatures between 70 and 120 °C in the presence of activation agents, mostly sulfuric acid [7].
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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 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 …
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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 surface modification of bentonite is to use physical, chemical, mechanical and other methods to change the surface structure, surface energy, …
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— The acid activation process affected the intercalated amount of C16TMA + cations in the resulting organoclays, and thus, the amount of PVP in the composite. The cation content decreased with extent of acid activation. ... Na-bentonite was acid-activated by either H 2 SO 4 at varying concentrations from 0.25 to 2.0 ...
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— Noyan, H. Önal, M. and Sarikaya, Y., 2007 The effect of sulphuric acid activation on the crystallinity, surface area, porosity, surface acidity, and bleaching power of a bentonite Food Chemistry 105 156 – 163 10.1016/j.foodchem.2007.03.060.
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Bentonite clays (BCs), whether in natural or modified form, have gained enormous potential in wastewater treatment and have been used successfully as a novel and cost-effective …
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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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— 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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— The acid activation is mostly carried out by sulphuric acid or hydrochloric acid. This activation process is carried out in a ratio of 1:3 to 1:7 clay to acid and after some specified time interval removal of spent acid and drying. The thermal activation is carried out in a muffle furnace, raw bentonite is to be placed in a muffle furnace for ...
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— Activation of bentonite by acid is an important step for adsorption of some impurities by active clay [6]. This is so-called "activation process". The activation of bentonite is carried out in a continuous stirred tank reactor at low temperatures between 70 and 120 °C in the presence of activation agents, mostly sulfuric acid [7]. During ...
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