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15.07.2011· The anion–cationic surfactant modified montmorillonite (MMT) were prepared. Anionic surfactant can be intercalated into the interlayer spaces of MMT. Organic carbon content of MMT can be improved by anion–cationic modification. The anion–cationic surfactant modified MMT has the largest sorption capacity. The adsorption of methyl orange is spontaneous and exothermic process.
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Adsorption of ions–Ion exchange Soils with Kaolinite dominant clay have higher anion exchange capacity than montmorillonite or illite. The relative order of anion exchange is OH > H 2 PO 4 > SO 4 > NO 3 > Cl. Importance of anion exchange: 1. The phenomenon of anion exchange is important for the release of fixed P in the soil. In acid soils the phosphorus is fixed as insoluble Al
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14.08.2017· Two laboratory grade montmorillonite samples with CEC of 71 (montmorillonite A) and 22 (montmorillonite B) mmol/100 g respectively were used in this study. Experimental results indicate that benzyltriethyl ammonium (BTEA) ion with an effective number of CH 2 groups in hydrocarbon chain of 5–7 should be used to provide reasonable estimations for monolayer capacity and CEC.
Get Price2) Vers pH, il existe un maximum d' adsorption de 1' anion qui peut être dû à une liaison PO -argile. 3) A mesure que le pH remonte, c'est-à-dire à mesure que s'accumulent des cations sur la montmorillonite, il y a moindre fixation de 0 . Celle-ci reste d'ailleurs plus marquée avec la montmorillonite-Ca qu'avec la montmorillonite-Na.
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26.01.2021· Montmorillonite (MMT) is a two-dimensional (2D) clay material. Its abundance on the early earth has attracted studies for its role in prebiotic reactions, and adsorption of DNA to MMT is potentially important for understanding the origin of life. Although several possible models of DNA adsorption on MMT have been established, a consensus on the adsorption mechanism has yet to be formed
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The high adsorption capacity of montmorillonite contributes to increase drug entrapment and sustained-release of drugs. Montmorillonite generally sustains drug release in many formulations by strongly adsorbing to the drug. In addition, montmorillonite enhances the dissolution rate and bioavailability of hydrophobic drugs.
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adsorption capacities of MMT for Pb2+ and Ni2+ ions at 293 K as calculated via the Langmuir isotherm were 133 g/kg and 56 g/kg, respectively. The kinetic data were poorly correlated by the pseudo-first-order model and the intraparticle diffusion equation, but were fitted perfectly by
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Montmorillonite has high cation exchange capacity and can be used as a sorbent for the removal of metal cations. But anions adsorption on the surface of the mineral is limited. Targeted regulation of hydrophobic and hydrophilic surface properties using sorbents provides an opportunity to increase its absorption properties in relation to anions.
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The active agent accepts cation-anion composite modification, which improves the adsorption capacity of the original modified montmorillonite. In the absence of biaxial stretching, the tensile strength and breaking point extension of the composite film added with organic nanomontmorillonite are significantly higher than those of the pure hyperbranched unextended film. The extended film
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The adsorption capacity is normally controlled by pH of the system, which also has effects on surface properties of the adsorbent and ionic forms of metal ions in the solution. The influence of pH in the range of 2–8 was studied keeping all other parameters constant (metal ion concentration = 500 mg/L; stirring speed = 162 rpm; contact time = 1 h; clay mass = 0.5 g; temperature = 25°C). Dilute concentrations of
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The cation to anion exchange capacities of different clay minerals were found to be: ADVERTISEMENTS: Clay â€" CEC/AEC . Montmorillonite â€" 6.7 . Illite â€" 2.3 . Kaolinite â€" 0.5 . ADVERTISEMENTS: The anion exchange is known to increase with adsorption of cations like zinc as Zn (OH) + or ZnCl + or both. The concentration of anions in the soil solution is affected by the
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Request PDF | On Dec 20, 2016, M.M.S.K.Mahalekam and others published Determination of Zn+2 ion adsorption capacity of Montmorillonite clay | Find, read and cite all the research you need on
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2) Vers pH, il existe un maximum d' adsorption de 1' anion qui peut être dû à une liaison PO -argile. 3) A mesure que le pH remonte, c'est-à-dire à mesure que s'accumulent des cations sur la montmorillonite, il y a moindre fixation de 0 . Celle-ci reste d'ailleurs plus marquée avec la montmorillonite-Ca qu'avec la montmorillonite-Na.
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The high adsorption capacity of montmorillonite contributes to increase drug entrapment and sustained-release of drugs. Montmorillonite generally sustains drug release in many formulations by strongly adsorbing to the drug. In addition, montmorillonite enhances the dissolution rate and bioavailability of hydrophobic drugs.
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The Langmuir model indicated that natural montmorillonite and kaolinite have low affinity for V (V) anions with maximum adsorption capacity of 0.98 mg·g⁻¹ and 0.78 mg·g⁻¹, respectively. The higher
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03.02.2015· The results indicated that the maximum adsorption capacity of Ni (II) reached 94.86 mg/g at an initial Ni (II) concentration of 0.0032 mol/L, a solution pH of 6.8, an adsorption temperature of 70°C, and adsorption time of 40 min.
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It was found that these values for the parameters could in turn be used to predict boron adsorption on Na‐montmorillonite systems at other pH values and boron concentrations. Results found for Na‐montmorillonite were consistent with those found by others in that boron adsorption varied with both pH and boron concentration, with maximum adsorption occurring at pH 9.3.
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They are, therefore commonly called bleaching clays. They fall mainly under Montmorillonite group containing a varying amount of attapulgite." Bentonite and Montmorillonite have similar mineral properties. The most important of which are attributed to the Smectite Family of clays. The Cation Exchange Capacity CEC and the Specific Surface area of Smectites are considerable larger than
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Montmorillonite has higher CEC in comparison to illite or kaolinite clay. (iv) pH: The capacity for holding anions increases with the increase in acidity. The lower the pH the greater is the adsorption. All anions are not adsorbed equally readily. Some anions such as H 2 PO 4 – are adsorbed very readily (quickly) at all pH values in the acid as well as alkaline range. Cl – and SO 4
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Fourteen anions were selected to investigate their adsorption capacities and affinities to unwashed and washed hexadecyl pyridinium (HDPy)-modified montmorillonite (HDPy/Mt). Correlations between adsorption characteristics and anionic properties including radius and hydration energy were determined. With the exception of IO 3 −, H 2 AsO 4 −, and CrO 4 2−, monovalent anions showed
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