Controlled drug delivery for glaucoma therapy using montmorillonite …
Controlled drug delivery for glaucoma therapy using montmorillonite/Eudragit microspheres as an ion-exchange carrier. Shuangyan Tian, 1 Juan Li, 1 Qi Tao, 2, 3 Yawen Zhao, 1 Zhufen Lv, 4 Fan Yang, 1 Haoyun Duan, 5 Yanzhong Chen, 4 Qingjun Zhou, 5 and Dongzhi Hou 1 ... Montmorillonite (Mt), as an effective …
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Ion-exchanged montmorillonite as simple and effective …
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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Characterization of anion–cationic surfactants modified montmorillonite
Owing to the hydrophilic environment at surface and low organic carbon content, natural clay is not an effective adsorbent for nonionic organic contaminants in water [4], [5]. As is well known, the surface properties of MMT may be greatly modified with surfactant by simple ion-exchange reactions.
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Ion equilibrium between montmorillonite interlayer space …
The montmorillonite mineral has an articulated layer structure. The thickness of an individual mineral layer is around 1 nm and the extension in the other two directions is often several hundred nanometers (Fig. 1).. Download: Download full-size image Fig. 1.. Schematic edge view of two montmorillonite layers on the atomic scale in contact with …
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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 …
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Estimation of Cation Exchange Capacity of Montmorillonite …
The specific surface areas of kaolinite, acid activated kaolinite, montmorillonite and acid activated montmorillonite were 3.8, 15.6, 19.8 and 52.3 m2/g respectively whereas the cation exchange ...
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Fe-pillared montmorillonite as effective heterogeneous Fenton …
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 …
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Changes of organo-montmorillonite by ball-milling in
Nanocomposites which are prepared using organoclays and polymers. Generally, organo-montmorillonite can be prepared using ion-exchange reactions with cationic surfactants. However, cationic-organo-montmorillonite (COMt) has poorer thermal stability. In addition, the preparation process of traditional OMt uses a large amount of …
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Controlled drug delivery for glaucoma therapy using montmorillonite …
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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Doped double spirocyclic cationic POSS for nanocomposite anion exchange
As traditional fossil fuels pollute the environment, the global energy crisis is getting serious, and the country's development direction for renewable energy has become clearer, making renewable energy expected to become a strong alternative to fossil fuels [1], [2].In recent years, hydrogen energy as a non-polluting, zero-emission, renewable …
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Effect of major cation water composition on the ion exchange …
Np(V) sorption was examined in pH 4.5 colloidal suspensions of nominally homoionic montmorillonite (Na-, K-, Ca- and Mg-montmorillonite). Ionic exchange on permanent charge sites was studied as a function of ionic strength (0.1, 0.01 and 0.001 M) and background electrolyte (NaCl, KCl, CaCl 2 and MgCl 2).An ion exchange model …
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Controlled drug delivery for glaucoma therapy using montmorillonite …
Controlled drug delivery for glaucoma therapy using montmorillonite/Eudragit microspheres as an ion-exchange carrier. Shuangyan Tian 1 Guangdong Engineering and Technology Research Center of Topical Precise Drug Delivery System, ... Montmorillonite (Mt), as an effective inorganic solid, has been proposed for …
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An effective route to montmorillonite intercalation with …
Montmorillonite-supported copper (I) catalyst has been prepared by a simple ion exchange method. The resulting catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectrometry, with results showing that Cu + had been successfully intercalated into …
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Research status of typical wastewater treatment technology …
When ion exchange and adsorption methods are used to remove nitrate nitrogen, anion exchange resins are mostly used. Chitosan [136], macroporous ion exchange resins [137] and hydrogels [138] can all achieve nitrate removal. Macroporous ion exchange resins can achieve the simultaneous removal of NH 4 + and NO 3 −, with …
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Cation-Intercalated Clay-Based Two-Dimensional …
Montmorillonite (MMT) is known as an ion-exchangeable material, and cations between MMT nanosheets are easily exchanged by other cations. In this work, Ca2+, Fe3+, and Al3+ intercalated two …
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Ion-exchanged montmorillonite as simple and effective …
DOI: 10.1016/j.cej.2020.127476 Corpus ID: 226332475; Ion-exchanged montmorillonite as simple and effective catalysts for efficient CO2 capture …
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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 …
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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 ...
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Ion-exchanged montmorillonite as simple and effective …
In conclusion, inexpensive montmorillonite clay catalysts were facilely prepared by simple ion-exchange with H 2 SO 4 acid and Zr metal solutions, and their …
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Cation exchange, interlayer spacing, and thermal analysis of …
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 …
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Assessment of acid–base strength distribution of ion …
A large series of NH 3-TPD measurements were performed on clays samples modified with a wide variety of exchangeable cations, some of them being presented in Fig. 1.The results presented herein provide evidence that ion exchange induces specific changes in the acid character for each exchanged clay, in agreements with previous …
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Subnanometer-scale control of channel height in two …
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. ... As an effective strategy to strengthen the constraint effect, glutathione can modify the end faces of nanosheets and …
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iChem Africa's Post
However, the simultaneous exchange of cations and anions can be carried out more effectively by passing the treated solution through a variety of ion exchange materials or mixed beds that comprise ...
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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 …
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Novel, Fluorine-Free Membranes Based on Sulfonated …
Novel blend membranes containing S-PVA and PEBAX 1657 with a blend ratio of 8:2 (referred to as SPP) were prepared using a solution-casting technique. In the manufacturing process, sulfonated montmorillonite (S-MMT) in ratios of 0%, 3%, 5%, and 7% was used as a filler. The crystallinity of composite membranes has been investigated …
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Effects of Exchange Titanium Cations on the Pore Structure …
Then, the adsorption isotherms of benzene, hexane, and cyclohexane were measured to identify how exchange process affected the adsorption characteristics of the montmorillonite. It was found that the ion-exchange processes could induce enormous changes in the surface and pore structure of montmorillonite and these changes could …
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Effect of salt solution concentration and cation types on the
Cation exchange test. To expedite the test process, cation exchange of bentonite was conducted using electrochemical methods. The test apparatus comprises a custom-made acrylic electrolytic cell (Fig. 2) featuring a centrally located electrolyte cell (240 mm × 160 mm) flanked by solution pools on both sides (50 mm × 160 mm).A …
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Corrosion resistance and ion exchange properties of montmorillonite …
Montmorillonite (MMT) film was prepared on the surface of alkali-heat treated Mg alloys by one-step hydrothermal method.The structure and composition of MMT film were characterized using scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, Fourier transform infrared spectroscopy and X-ray …
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Montmorillonite: An Introduction to Properties …
The exchangeability of interlayer cations, through ion exchange, helps in altering the acidic nature. Modified montmorillonite types known as montmorillonite-K-10 (produced by the calcinations of …
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Development of free flowing granular hybrid functionalized …
In addition, clay sorbents like montmorillonite are cost-effective and environmentally friendly, as they are naturally abundant materials. The ion exchange capacity of montmorillonite is effective also in contaminant removal by ion-exchange mechanisms (Ianchis et al., 2012; Mao and Gao, 2021). These sorbents can often be regenerated …
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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 …
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Stabilization of structure and channel height of two …
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. …
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Modified Nano-Montmorillonite and Monensin Modulate In …
They found that NM was less effective in inhibiting methanogenesis than other kaolinite clays. Montmorillonite platelets have a unique ionic composition: a negative charge flat surface and positive charge edges [5,6]. Thus, inorganic ions in NM can be effectively exchanged with both cationic and anionic surfactants through ion exchange ...
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Effects of cation exchange on the pore and surface structure …
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 were studied. ... Benzene, which has a plate-like configuration, may have more effective montmorillonite packing than hexane or …
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Changes of organo-montmorillonite by ball-milling in
For the sodium ion exchange, the montmorillonite was dispersed in distilled water. Then, a 0.025-M NaOH solution was added, at 80 °C under continuous stirring for 3 h, to give a 1 wt.% solution. ... by prior ion exchange in only 6 h when sodium ions were first introduced. Therefore, it seems the ball-milling is very effective for …
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Organoclays: Properties, preparation and applications
Gieseking (1939) found methylene blue to be very effective in replacing interlayer cations. These results suggested the possibility of using ammonium ions of the NH 3 R +, NH 2 R 2 +, NHR 3 +, and NR 4 + types to throw more light on the mechanism of cation exchange in clay minerals. Montmorillonite, beidellite and nontronite types of …
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An electroactive montmorillonite/polypyrrole ion exchange …
Herein, the excessive expansion of the interlayer spacing could weaken the molecular interaction between the intercalated PPy and the MMT layer, leading to the ion exchange capacity decreased. As a result, the MMT/PPy nanocomposite film has maximum ion exchange capacity when the PPy concentration is 0.35 M.
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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 …
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Cation exchange reaction drives CeMn-montmorillonite …
The development of a cost-effective and eco-friendly catalyst with superior activity for low-temperature selective catalytic reduction of NO X with NH 3 (NH 3-SCR) is an urgent issue.In this work, a series of CeMn- supported montmorillonite (MMT) were synthesized via a cation exchange reaction.
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