Two-dimensional Montmorillonite membranes with efficient water filtration

Amorphous TiO2 Bridges Stabilized WS2 Membranes with Excellent Filtration Stability and Photocatalysis-Driving Self-Cleaning Ability

“…The microstructure of the spent membrane in Figure S7 reveals an original layered structure, and TiO 2 particles still tightly attach to the membrane surface, revealing the robust structure of the WS 2 /TiO 2 membrane. More importantly, the continuous filtration time of the WS 2 /TiO 2 membrane under cross-flow conditions was also compared with that of the reported membranes in recent literature, including various 2D membranes − and covalent organic framework (COF) membranes, as shown in Figure f and Table S1. It needs to be stated that the filtration time with a small change of water permeance and rejection rate was used for comparison.…”

Applications of Lamellar Membranes Reconstructed from Clay Mineral-Based Nanosheets: A Review

“…In a similar approach, Huang et al prepared a large number of single-layer MMT flakes of slightly larger lateral dimensions through the vigorous stirring of Na + -MMT particles in water for 1 week followed by ultrasonic treatment for 40 min. 35 Stirring followed by ultrasonication treatments was also exploited by Zhang fabricating multifunctional clay−polymer composites. 36,37 A similar intercalation followed by ultrasonication treatment method was also found to be effective in exfoliating other clay minerals such as mica, saponite, and sepiolite.…”

“…The lateral dimensions of the MMT flakes prepared as such were found to be in the range 260 ± 60 nm (Figure c). In a similar approach, Huang et al prepared a large number of single-layer MMT flakes of slightly larger lateral dimensions through the vigorous stirring of Na + -MMT particles in water for 1 week followed by ultrasonic treatment for 40 min . Stirring followed by ultrasonication treatments was also exploited by Zhang et al and Meng et al to prepare atomically thin layers of MMT flakes and used for fabricating multifunctional clay–polymer composites. , A similar intercalation followed by ultrasonication treatment method was also found to be effective in exfoliating other clay minerals such as mica, saponite, and sepiolite. − Ploehn et al demonstrated atomic force microscopy (AFM) to be an effective tool for detailed quantitative analysis of exfoliated 2D nanomaterials by taking MMT as an example, and they uncovered valuable details about the size distribution of the exfoliated MMT platelet at different stages of the ultrasonication-based exfoliation process .…”

“…Similarly, MMT membranes with different thicknesses were coated on poly­(vinyl alcohol)-treated nylon membranes via the vacuum filtration method. The lamellar MMT coating on a nylon membrane was found to be stable under extreme pH conditions and showed good resistance to shear force during 2 days of cross-flow filtration . Xiao et al prepared temperature-responsive 2D cationic nanochannels by vacuum-assisted stacking of dioctadecyldimethylammonium bromide functionalized MMT lamellae …”

First-Principle Colloidal Gate for Controlling Liquid and Molecule Flow Using 2D Claylike Nanoparticles

“…More recently, 2D nanoparticles have been used to make membranes for water and gas purification. Examples for such membrane systems have been realized using 2D nanoparticles such as natural montmorillonite, boron nitride nanosheets, and graphene oxide (GO). − The transport of solutes or ions through the so-called nanochannel dictated by the interparticle spacing in such membranes may be regulated by altering the interlayer spacing through particle surface modification. ,, …”