No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
The data are fit to a model which accounts for H+ ion exchange on montmorillonite and suggests that H+ exchangeable cations facilitate the reduction of Pu(V) at neutral to mildly acidic pHs. ... solution species is PuO2+ (Figure S1B). The axial oxygen bonds lower the effective charge of Pu(V) and Np(V) to approximately +2.3 [3]. This lowered ...
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 ...
The cation exchange capacity with single ion exchange capacity illustrates that Mg2+ and Ca2+ do not only take part in cation exchange but also produce physical adsorption on the montmorillonite. Although interlayer spacing d 001 depends on both radius and hydration radius of interlayer cations, the latter one plays a decisive role in changing ...
Ca-montmorillonite was exchanged with the metal cations, titanium, iron, and copper and the ion-exchange effects on the surface area, pore structure and adsorption property of the montmorillonite ...
Among various water treatment technologies, ion exchange (IE) has emerged as one of the most promising technologies for water treatment. The process in which exchange of an ion from a solution with a similarly charged ion present on a stationary solid particle, called IE resin, occurs in a reversible chemical reaction is termed as IE.
Montmorillonite and its derivatives, a unique group of under-utilized clay-based minerals has been proposed to be a suitable candidate for the treatment of contaminated wastewater.
Montmorillonite is a clay mineral and the main component in bentonite clay, which is utilized in various applications including its planned use as a buffer material for long-term nuclear waste disposal. In the present paper, a quantum chemical study is presented providing an insight into montmorillonite structure and its surface chemistry, which plays a key role in …
Aluminum ion-exchanged Ca-montmorillonite with different concentrations of aluminum ion were prepared and applied in the conversion of carbohydrates to 5-hydroxymethylfurfural (HMF).
Montmorillonite (MMT) is a layered mineral and can be easily exfoliated to 2D nanosheets due to its hydration swelling property [24]. 2D membrane with ordered sub-nanometer scale channels can be facilely assembled by the van der Waals binding between stacked MMT nanosheets.In addition, MMT can also be easily modified to change its interlayer spacing due …
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 N2 adsorption–desorption at low temperature. It was found that iron polycation was successfully inserted into MMT layers, and the textural properties of Fe-MMT …
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 …
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 ...
ABSTRACT Weathered crust elution-deposited rare earth ores (WREO) are the most important mineral sources of the middle and heavy rare earth in the world, which are rare earth ions (RE3+) adsorbed on clay minerals, such as montmorillonite, kaolinite, etc. In this work, the adsorption mechanism of Lanthanum ion (La3+) and Yttrium ion (Y3+) on montmorillonite was studied to …
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 ...
Advantageous properties of montmorillonite made it appropriate for many applications such as use in oil drilling industry as a component of drilling mud, soil additive, …
Modification of the surfaces of montmorillonite (Mnt) by organic molecules is an effective method for improving their affinity toward non-aqueous substances, and has resulted in extensive industrial applications as rheological control agents, drilling fluids, and other functional materials used in applications ranging from environmental remediation to coatings. The …
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 …
Cation exchange equilibria are often illustrated in diagrams by plotting the concentration (c ¯ A +) or equivalent fraction (χ ¯ A +) of A + at the surface vs. the concentration (c A +) or equivalent fraction (χ A +) of this ion in the equilibrium solution. For monovalent cations the equivalent fractions are given by (1) χ ¯ A + = m ¯ A + / (m ¯ A + + m ¯ B +) χ ¯ B + = m ¯ …
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 …
Based on the natural ion exchange property of MMT, protonated TEPA can exchange into the interlayer of MMT membranes and the hydrophobic chain of TEPA can prevent water molecules from entering the channel. ... Subnanometer-scale control of channel height in two-dimensional montmorillonite membrane for ion separation. J. Memb. Sci., 675 (2023 ...
After ion exchange from Ca ion to Na ion, the increase in the swelling pressure and reduction of the permeability were observed when the deionized water permeated. While, after ion exchange from Ca ion to K ion, there was no significant recovery of the swelling pressure from the state of high ionic strength when the deionized water permeated.
In this work, we synthesized inexpensive M-montmorillonite (M = Cr, Fe, and Co) catalysts via a facile metal ion-exchange process and used these to optimize the CO 2 desorption rate of a 30 wt % monoethanolamine (MEA) solution at a …
Modified montmorillonite types known as montmorillonite-K-10 (produced by the calcinations of montmorillonite) were found as efficient catalysts. Cation exchange produces more effective montmorillonite types including Fe + …
Montmorillonite is rich in metal ions, and the exchange between cations and montmorillonite can be realized by changing the solute cations in the solution where montmorillonite is located (Hosseini et al., 2019), so montmorillonite is widely used to prepare composite materials in the field of heavy metal adsorption.
The physical properties of clays and micas can be controlled by exchanging ions in the crystal lattice. Atomically thin materials can have superior properties in a range of membrane applications ...
The study examined the possibility of intercalation of montmorillonite with neomycin in an aqueous drug solution and the factors influencing the effectiveness of this …
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 …
electrolysis, coagulation, ion-exchange, and filtration, have been successfully applied to treat polluted water. Adsorption has been proved to be one of effective physical-chemical treatment methods for removing heavy metals from aqueous solution, thanks to …
Controlled drug delivery for glaucoma therapy using montmorillonite/Eudragit microspheres as an ion-exchange carrier. ... Montmorillonite (Mt), as an effective inor-ganic solid, has been proposed ...
The ion-exchange capacity (IEC) relates to the amount of charged functional groups per unit volume of dry membrane, which are in interaction with water and mediate ion transport. The IEC of an ion-exchange membrane can be determined via titration [17–20] which measures the quantity of counter-ions released by the membrane in an external solution, by Nuclear …
