A sulphated tin ion-exchanged montmorillonite (SO4²⁻/Sn-MMT) was successfully prepared by the ion exchange method of montmorillonite (MMT) with SnCl4, followed by the sulphation.
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Montmorillonite (MMT) is known as an ion-exchangeable material, and cations between MMT nanosheets are easily exchanged by other cations. In this work, …
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In this work, we advance this approach by preparing abundant and inexpensive montmorillonite (Mont) clay-based catalysts using a simple ion-exchange process and evaluated their catalytic performance for CO 2 desorption from MEA solution.
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Ion exchange has been suggested as the major mechanism for uptake of adsorbates at less than the CEC of the clays [3]. However, if the adsorption is more than the CEC, hydrophobic forces play a major role in the adsorption mechanism. ... (III)–Montmorillonite as an effective adsorbent for the removal of Methylene Blue from …
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Among metal ion-exchanged montmorillonite (M n+-mont) and various Fe 3+ catalysts, Fe 3+-mont was most effective for the acetylation of cyclohexanol with acetic anhydride.Using probe molecules sensitive to acid, IR and microcalorimetric experiments were conducted for characterizing acidity of each catalyst, and the …
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Montmorillonite is composed of units made up of two silica tetrahedral (T) sheets with a central alumina octahedral (O) sheet. The tetrahedral and octahedral sheets are combined so that the tips of the tetrahedrons of each silica sheet and one of the hydroxyl layers of the octahedral sheet form a common layer.
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In this work, LS-MMT was prepared with sodium lignosulfonate as modifier under mild conditions, and a certain amount of Ca 2+ ion was added during the synthesis process to form a cationic bridge to increase the electrostatic interaction between montmorillonite and lignosulfonate. Moreover, the experimental outcomes presented …
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In this work, we report a new class of inexpensive and abundant montmorillonite clay-based catalysts for this purpose, which can be readily tuned by …
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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 …
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Surface modification of montmorillonite by the use of organic cations via conventional ion exchange method. Johannes Chanra 1, ... (MMT) can be done through conventional ion exchange method using cationic surfactants. Montmorillonite (MMT) was modified with several cationic surfactants based on its cationic exchange capacity …
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The ion exchange of Np(V) will be dependent on its speciation in solution. Fig. 1 shows Np(V) aqueous speciation as a function of pH at ionic strength 0.1 M in the presence of monovalent cations (NaCl or KCl) and divalent cations (CaCl 2 or MgCl 2), for a Np(V) concentration of 5.5 × 10 −6 M (Np speciation did not change across the range of …
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Ion-exchange modeling is one of the most widely used methods to predict ion adsorption data on clay minerals. The model parameters (e.g. number of adsorption sites and the cation adsorption capacity of each site) are optimized normally by curve fitting experimental data, which does not definitively identify the local environment of the …
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Montmorillonite, as a member of phyllosilicate, is a classical inorganic material for eliminating heavy metal ion pollution due to the ion self-concentrate that induced higher ionic concentration ...
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Unfortunately, effective treatments are limited by poor bioavailability of antiglaucoma medicine due to short residence time on the preocular surface. Materials and methods: To solve this, we successfully prepared novel controlled-release ion-exchange microparticles to deliver betaxolol hydrochloride (BH). Montmorillonite/BH complex (Mt …
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In this work, aluminum montmorillonite (Al-mont) catalysts were prepared through ion-exchange of natural calcium montmorillonite (Ca-mont) with an aqueous solution of aluminum trichloride. And the samples were characterized by XRD, ICP, N 2-TPD, NH 3-TPD, Py-IR and so on. Moreover, the catalyst also showed a good …
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The introduction of oxide pillars in the interlayer space of montmorillonite and the immobilization of metal oxides or zero-valent metals on the surface of montmorillonite allow montmorillonite to be used in the catalytic oxidation, reduction, isomerization and coupling reactions.
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Montmorillonite (MMT), a 2:1-layered aluminosil-icate, is a natural clay mineral. The alkali and alkaline earth metal ions, as charge-balance cations located in the clay interlayer, are exchangeable. Based on these properties, the structure of MMT could be tailored by acid and alkali activation, ion exchange, pillaring, and
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The Na + montmorillonite (Mt) was modified with l-cystine, and palladium was loaded via an ion-exchange reaction under microwave irradiation to obtain Pd@Mt. The entire process was conveniently carried out under mild reaction conditions in a matter of hours. ... Montmorillonite clay is an effective, eco-friendly, economic and recyclable ...
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Calcination treatment of Li-bearing clay is a necessary step in the ion exchange leaching process, and the calcination temperature has been investigated by using sulfuric acid for leaching (Gu et al., 2020a).The Li-bearing clay calcined at various temperatures (400, 500, 600, 700, and 800 °C) was leached using a 15% ferric sulfate …
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Sn-exchanged mont (Sn-mont) is another type of mont prepared by ion exchange that is known to have a unique structure and high catalytic performance [46–58]. The Sn-mont, prepared by the ion exchange of Na-mont and a SnCl 4 aqueous solution, does not exhibit the typical stacking structure but instead demonstrate a disordered layer …
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Semantic Scholar extracted view of "Activation of montmorillonite by ion exchange and sorption complexes of tetra-alkyl ammonium montmorillonites" by R. M. Barrer et al. ... An important goal in environmental research for industrial activity and sites is the investigation and development of effective adsorbents for chemical pollutants that are ...
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To enable the reliable removal of nitrates from aqueous solutions/treated wastewater, anion exchange resin was used. Ion exchange with strong basic anion exchange resin is an effective way of nitrate removal. Scanning electron microscopy was evaluated to understand the morphology of the resin prior all laboratory studies. Ion …
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Inspired by the natural ion exchange properties of montmorillonite, this study found a new method for inhibiting the hydration swelling of two-dimensional membrane and realizing precise control of interlayer spacing. ... Effective ion sieving with Ti3C2Tx MXene membranes for production of drinking water from seawater. Nat. Sustain., 3 (2020 ...
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Clay minerals have been recognized as one of the cheap and effective materials for wastewater remediation. Among the various clay minerals, montmorillonite (MMT) has received much attention due to its wide availability, low-cost and promising properties such as high porosity, mechanical strength, and cation exchange capacity. …
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The nano‐containers are divided into five main categories with self‐healing activity which are: ion‐exchange based materials (i.e., clay, bentonite, montmorillonite, feldspar, layer double ...
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Bentonite clay is proposed as buffer material in several concepts of High Level Radioactive Waste repositories, and a correct description of ion diffusion in this material is of vital importance for any quantification of the chemical evolution of the repository near field.. This study investigates the importance of ion equilibrium between …
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Clinoptilolite is one of the most common, widespread and abundant zeolites in nature. Its availability, low cost, and outstanding ion exchange properties make clinoptilolite an excellent candidate for both direct use and various modifications to create new low-cost functional materials for sustainable development. Specific applications in …
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In this work, a novel electroactive MMT/PPy nanocomposite film was successfully synthesized via intercalating conductive polymer PPy into the interlayer of MMT laminate for selective and rapid capture of Pb 2+.As illustrated in Fig. 1 A, those Na + ions existing between the layers can be replaced by introducing the dimethyl …
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The kinetics of ion exchange are governed by either a diffusion or mass action mechanism, depending on which is the slowest step. Diffusion of ions in the external solution is termed liquid film control, but is hydrodynamically ill-defined.The diffusion and transport of ions within the ion exchanger is termed particle diffusion control.Chemical …
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Abstract The natural Na-type montmorillonite (Na-MMT) was pillared by iron polycation to obtain Fe-pillared montmorillonite (Fe-MMT). The materials were characterized by X-ray powder diffraction and N 2 adsorption–desorption at low temperature. It was found that iron polycation was successfully inserted into MMT …
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This latter effect, which is small for montmorillonite, refers to the decreased rate of exchange of potassium as compared with smaller exchange cations especially after the potassium-saturated ...
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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 CH2 groups in hydrocarbon chain of 5–7 should be used to provide reasonable estimations ...
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