Kaolinite in pharmaceutics and biomedicine
They showed that kaolin (15% wt) added to the aqueous phase (at pH = 7.2) promoted the long-term stability of the emulsion without any additive surfactant or …
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They showed that kaolin (15% wt) added to the aqueous phase (at pH = 7.2) promoted the long-term stability of the emulsion without any additive surfactant or …
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Batch studies were conducted to evaluate the adsorption efficiency for dye removal from aqueous solution under varying conditions such as initial pH (pH), contact time, initial dye concentration on adsorption of dye. The optimum pH was found to be 6. The investigations in this study showed that 83% of dye removal can be achieved at the first …
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In recent years, there is an increasing body of studies on dye adsorption from aqueous solutions onto kaolin supplied from different countries, such as basic yellow 28 ... After this pH value, the ...
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Section snippets Materials. Kaolin clay powder, Al 2 Si 2 O 5 (OH) 4, with a particle diameter of <1 µm (surface area of 5 m 2 /g) was used as the raw material for the preparation of kaolin hollow fiber membrane (KHFM) and it was procured locally from Perak, Malaysia. Polyethersulfone (PESf, Radel A-300, Ameco Performance, USA) and …
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Except for kaolin/ZnO nanocomposites prepared at pH 8 which showed the medium reflection of pure ZnO at 2 theta value of 25.1° and others revealed a mixture of zinc oxide and kaolinite.
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When the pH value of kaolin aqueous solution is larger than pH PZNPC of the amphoteric (mainly edge) sites, the deprotonation of aluminol and silanol groups through the reactions (1), (2) take place in the solution accompanying the formation of …
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As anticipated, the kaolin particles in process water and absence of polymer at pH 8.5 are negatively charged with an average zeta potential value of −40 mV. Results in Fig. 10 show a significant increase in zeta potential of kaolin particles from −40 mV to −8 mV (i.e., less negative) when 5 ppm Al-PAM or Fe-PAM is added.
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For the effect of dosage studies, the initial pH value of 50 mL 100 mg L −1 Pb(II) was adjusted at 5.5 and shaken with 0.05–0.5 g HK for 2 h. The final concentration of unadsorbed lead ions was then determined. For equilibrium studies, only the initial pH value of the metal solution was controlled upon adding UnK or HK.
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The investigation of possible use of Alginate/ polyvinyl alcohol -kaolin composite instead of free kaolin in the removal of methylene blue from aqueous solutions was studied.
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The pH of the aqueous solution obtained for the DLS analysis was mainly around 6 (close to the measured 5.7 pH of the applied distilled water). ...
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removing dye from aqueous solution. Kaolin was used as a local, available, and ... values pH Kaolin (g) Time (min.) pH X. 3. Kaolin X. 2. Time X. 1. 31.9329 32.96 6 0.1 12 0 -1 -1 1
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A higher pH value gives rise to more negative charges, which lead to a higher CEC value. This study indicates that charge from broken edges and exposed OH …
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The RL values of 0.03160, 0.03510, and 0.00120 (Table 2) for TSS, color, and turbidity, respectively, indicate that the adsorption of TSS, color, and turbidity on natural zeolite was favorable (0 ...
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The pH PZC for the CTAB–kaolin was found to be 6.2 (Fig. 5). Hence, when the pH of solution is less than pH PZC, the CTAB–kaolin surface becomes positive and attracts anions (such as CrO 4 2−) from the aqueous solution, and when it is greater than pH PZC, the surface becomes negative and attracts cations from the solution.
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As show in Fig. S4b, the pH increases by 0.5–0.3 pH units at the initial pH range of pH 2–4, and it remains stable to the initial value at higher pH. The pH increase after sorption may be caused by the binding of protons through protonation of amine groups or the release of hydroxide ions by displacing of uranyl species.
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The calculated values of Δ G 0 for beneficiated adsorbent are -1.243, 1.576, and 4.396 kJ/mol at 303.15, 323.15, and 343.15 K, respectively for 20 mg/L of dye concentration and solution pH of 9 ...
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Optimal conditions for phenolic removal were; contact time of 300 min, primary phenol solution of 25 mg/L, pH 7 and 2.5 g/L as an appropriate adsorbent dose using crude (natural), acid modified ...
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iron-kaolin clay was used as an adsorbent of Pb(II) and Cd(II) ions from aqueous solutions. The effects of various experimental parameters, such as initial metal
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4. Conclusion The selected raw kaolin KT3B sample proved to be an effective adsorbent for the removal of from aqueous solution. The percentage of adsorption was maximal at a pH value of 9.0 and decreased in more acidic solutions.
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Under soil washing conditions of the dosage of AHG(acid) of 3%, water/soil ratio of 3/1, and washing time of 48 h, the removal efficiency of copper from kaolin by AHG(acid) was 72.8%, and after 5 ...
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The maximum adsorption capacities of copper on AHG(acid) and AHG(base) from aqueous solution were 34.8 and 40.4 mg g −1, respectively. However, the removal efficiency of copper from kaolin soil by AHG(acid) was much higher than that by AHG(base), because AHG(acid) could reduce pH values of soil, but AHG(base) could …
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A removal mechanism of chromate (Cr) by synthesized kaolin supported nanoscale zero-valent iron (K-nZVI) from aqueous solution is demonstrated. Parameters which potentially influenced the ...
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At blood pH of 7.35–7.45, the surface charge value that was obtained between pH 6–8 should be specifically focused. The results showed that both kaolinites …
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Effect of solution pH on the removal of phosphate and nitrate ions using MK-chitosan beads were examined and the achieved results are represented in Fig. 2 C. Effect of solution pH on phosphate and nitrate removal efficiency of MK-chitosan beads was studied in the pH range from 3 to 12 using 0.1 M HCl/ NaOH aqueous solutions. …
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Effect of temperature on the maximum adsorbed quantity for adsorption of glimepiride on activated charcoal and kaolin in pH=1 Adsorbent Kaolin Activated charcoal T. oC 25 30 37 25 30 37 T. oK 298 303 310 298 303 310 Effect of pH According to the concept that is known as "diffuse double-layer" the clay particles in aqueous solution are charged ...
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Kaolin-Fe3O4 nanoparticles synthesized by co-precipitation and hydrothermal methods was used to remove Acid Red 14 (AR14) from aqueous solutions at various pH, dye concentrations, adsorbent ...
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The buoyant adsorbents could efficiently remove copper from aqueous solution and kaolin. • The buoyant adsorbent of AHG(acid) could reduce pH value of kaolin soil. • The buoyant adsorbent of AHG(base) could increase pH value of kaolin soil. • AHG(acid) showed excellent reusability in removal of copper from contaminated kaolin.
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The optimum removal of fluoride for adsorbents was found at a pH value of 4. Besides, pH at point of zero charge (pHpzc) was obtained as 6.5. Thus, when pH of …
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Effect of solution pH on the percentage removal of BY 28, CR, and RR 120 dyes onto prepared adsorbent (adsorbent dose ¼ 1 g/100 mL, contact time ¼ 60 min, initial dye concentration ¼ 20 mg/L ...
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Adsorption of methylene blue from aqueous solution by kaolin ... PZC is determined at the value for which pHfinal =pH initial. pH of the solutions is maintained by using 0.1 N HCl and 0.1 N NaOH
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chromium ions from aqueous solutions using kaolin-ite, J. Hazard. Mater. 148 (2007) 56–63. ... The CR removal% is clearly affected by catalyst dose, working temperature, and pH value with high ...
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mg/L, solution pH of 9, the temperature of 30 C C, and contact time of 60 min and adsorbent dosage of 1g/ 100L. The molar ratio of SiO 2 /Al 2 O 3 was recorded as 2.911 Percent mass composition of ...
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The systematic study of the naphthalene adsorption by the kaolin/Fe3O4 composite, using the central composite design, revealed that an increase in solution pH, contact time, or composite dose ...
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