آخرین محصولات
Cation exchange reaction drives CeMn-montmorillonite …
In this work, a series of CeMn- supported montmorillonite (MMT) were synthesized via a cation exchange reaction. The effects of the valence state of the Mn precursor, acid or base pretreatment of MMT, and the molar ratio of Ce/Mn on zCeMn (x)-MMT (y) were examined.
An Electroactive Montmorillonite/Polypyrrole Ion Exchange …
Fast lithium ion transport with a high current density is critical for thick sulfur cathodes, stemming mainly from the difficulties in creating effective lithium ion pathways in high sulfur ...
Montmorillonite: An Introduction to Properties and …
Cation exchange produces more effective montmorillonite types including Fe + montmorillonite and clayfen. Sodium montmorillonite (NaMMT) is indicated to accelerate the curing of urea-formaldehyde resin.
Efficient Li+/Mg2+ separation by two-dimensional …
Inspired by the natural ion exchange property of montmorillonite (MMT), we constructed a two-dimensional MMT membrane with robust nanochannels by exchanging Fe 3+ into interlayer of …
ION EXCHANGE
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 reaction (step 3) is …
ION EXCHANGE
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 …
Ion-exchanged montmorillonite as simple and effective …
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 simple ion-exchange with acid or metal solutions. As an example, in this study montmorillonite was ion-exchanged with an acid, H2SO4 and a metal, Zr.
A Critical Review of Clay Minerals for Groundwater …
2.1.2 Mechanism of ion exchange. The process of ion exchange involves the replacement of weakly bound cations on the clay surface (often Na +, K +, Ca 2+, or Mg 2+) with other cations from the surrounding solution.This exchange is governed by factors such as the valence and hydrated radius of the ions, as well as their concentration in solution [].For …
Effective adsorption of heavy metal ions by sodium …
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 that the adsorption ...
A Review on Montmorillonite-Based Nanoantimicrobials: …
2.1. Ag/MMT Nanocomposite by Ion Exchange and Chemical Reduction. As MMT is negatively charged, it can adsorb metal cations, which could be easily incorporated by simple ion exchange methods within the interlayer space of MMT, and this can eventually result in improved antimicrobial behavior with a more controlled release of the active species.
Effective phosphorus removal using chitosan/Ca-organically …
Phosphorus is an essential element for biological growth, but its excessive presence as phosphate (PO 4 3−) contributes to eutrophication in rivers and lakes, leading to oxygen depletion, biodiversity reduction, and generation of harmful algal growth [1,2].Therefore, effective treatment methods for the removal of phosphorus are essential to prevent …
Ion-exchanged montmorillonite as simple and effective …
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 simple ion-exchange with …
Efficient Li+/Mg2+ separation by two-dimensional montmorillonite …
Inspired by the natural ion exchange property of montmorillonite (MMT), we constructed a two-dimensional MMT membrane with robust nanochannels by exchanging Fe 3+ into interlayer of the membrane, and further achieved efficient separation of Li + /Mg 2+ through coordination manipulation of tannic acid (TA) and Fe 3+.
Cation exchange capacity of the different …
Montmorillonite was first submitted to different treatments: (a) calcination at 550°C for 3h and (b) grinding during 300s. After that, the samples were loaded with silver by ion exchange.
A Review on Montmorillonite-Based Nanoantimicrobials: …
As MMT is negatively charged, it can adsorb metal cations, which could be easily incorporated by simple ion exchange methods within the interlayer space of MMT, and this can eventually result in improved antimicrobial behavior with a more controlled release of the active species.
Feasibility of montmorillonite-assisted adsorption process for …
Of major interest, the most preferential modification techniques of montmorillonite are the cation exchange, solid state reaction, pillaring process and acid activation. 3.1.1. Cation exchange Cation exchange is defined as the interlayer cations exchange of clay minerals by quarternary alkylammonium cations in the aqueous solution.
A Review on Montmorillonite-Based Nanoantimicrobials: …
As MMT is negatively charged, it can adsorb metal cations, which could be easily incorporated by simple ion exchange methods within the interlayer space of MMT, and this can eventually …
Ion-exchanged montmorillonite as simple and effective …
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 simple ion-exchange with acid or metal...
Montmorillonite: An efficient, heterogeneous and green …
Montmorillonite clay both Bronsted and acidic catalytic sites are available hence its natural occurrence as well as ion exchange properties allow it to function efficiently as a catalyst. The interlayer cations are exchangeable,
Ion-exchanged montmorillonite as simple and effective …
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 simple ion-exchange with acid or metal solutions. As an example, in this study montmorillonite was ion-exchanged with an acid, H 2 SO 4 and a metal, Zr. The ion-exchange process substantially ...
Functionality developments in montmorillonite nanosheet: …
The ion exchange capacity of MMT is commonly measured by the Cation Exchange ... requires minimal equipment, environmental friendly, wide applicability, no solvent pollution ... Due to its environmentally friendly and cost-effective nature, montmorillonite nanosheet composite membrane materials are expected to become a better choice for the ...
Cation exchange, interlayer spacing, and thermal analysis of …
Montmorillonites with interlayer cations Li + or Na + have remarkable swelling capacity and keep excellent stability. It is shown that metal ions represent different exchange ability as follows: Cs + > Rb + > K + > Na + > Li + and Ba 2+ > Sr 2+ > Ca 2+ > Mg 2+.
Cation exchange reaction drives CeMn-montmorillonite …
In this work, a series of CeMn- supported montmorillonite (MMT) were synthesized via a cation exchange reaction. The effects of the valence state of the Mn precursor, acid or …
Cation exchange capacity of the different montmorillonites.
Montmorillonite was first submitted to different treatments: (a) calcination at 550°C for 3h and (b) grinding during 300s. After that, the samples were loaded with silver by ion exchange.
Ion-exchanged montmorillonite as simple and effective
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 simple ion-exchange with acid or metal solutions. As an example, in this study montmorillonite was ion-exchanged with an acid, H2SO4 and a metal, Zr.
Effective adsorption of heavy metal ions by sodium …
Sodium lignosulfonate (Na-LS) was used to modified montmorillonite to form lignosulfonate-montmorillonite (LS-MMT). The as-prepared samples were characterized by various equipment to analyze the ...
Cation exchange, interlayer spacing, and thermal analysis of …
Montmorillonites with interlayer cations Li + or Na + have remarkable swelling capacity and keep excellent stability. It is shown that metal ions represent different exchange …
Ion-exchanged montmorillonite as simple and effective …
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.
Montmorillonite: An efficient, heterogeneous and green …
Montmorillonite clay both Bronsted and acidic catalytic sites are available hence its natural occurrence as well as ion exchange properties allow it to function efficiently as a catalyst. The …
Neomycin Intercalation in Montmorillonite: The Role of Ion Exchange
The study examined the possibility of intercalation of montmorillonite with neomycin in an aqueous drug solution and the factors influencing the effectiveness of this process, such as the ion exchange capacity and process conditions, including the time and temperature of incubation with the drug. X-ray diffractometry (XRD), infrared spectroscopy …
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