Montmorillonite Membranes with Tunable Ion Transport by Controlling Interlayer Spacing

Article Engineering, Chemical

Subnanometer-scale control of channel height in two-dimensional montmorillonite membrane for ion separation

Tingting Zhang et al.

Summary: By intercalating CTAC into montmorillonite, a 2D membrane for efficient ion separation can be prepared with precise control of the channel height ranging from 0.40 nm to 0.52 nm.

JOURNAL OF MEMBRANE SCIENCE (2023)

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Article Multidisciplinary Sciences

Nanoconfinement enabled non-covalently decorated MXene membranes for ion-sieving

Yuan Kang et al.

Summary: The authors demonstrate controllable and selective mass transport through non-disruptive non-covalent modification of sub-1-nm MXene channels, enabled by nanoconfinement effect. Traditional covalent modification used to tune the size and functionality of 2D membranes often disrupts the membrane structure. However, in this study, non-intrusive non-covalent modifications on Ti3C2Tx MXene membranes were achieved by solvent treatment, resulting in densely functionalized channels decorated by protic solvents via hydrogen bond network. These as-decorated membranes exhibit stable ion rejection and enhanced proton-cation selectivity, making non-covalent methods a potential modification alternative for nanochannels in energy, resource, and environment-related applications.

NATURE COMMUNICATIONS (2023)

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Article Environmental Sciences

Layered double hydroxide-modified membranes for water treatment: Recent advances and prospects

Muhammad Sajid et al.

Summary: Layered double hydroxides (LDHs) are a class of two-dimensional inorganic materials with unique physicochemical properties, widely used in water treatment and membrane separation. LDH-based membranes exhibit excellent antifouling capability and enhanced water flux for the treatment of organics and inorganics in environmental water samples.

CHEMOSPHERE (2022)

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Article Chemistry, Multidisciplinary

A Two-Dimensional Lamellar Vermiculite Membrane for Precise Molecular Separation and Ion Sieving

Mengtao Tian et al.

Summary: This study evaluates the application potential of 2D vermiculite (VMT) nanomaterials in high-performance membrane development. Large-scale 2D VMT nanosheets were prepared using a simple method, and the VMT membrane showed excellent stability, fast solvent permeance, and ion sieving ability. The broad applicability of the VMT membrane was also confirmed through intercalation optimization strategy.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2022)

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Review Nanoscience & Nanotechnology

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Liu Yang et al.

Summary: This article reviews the research advances on high-performance nanofiltration membranes based on two-dimensional graphene oxide (GO), including preparation methods, chemical modification and physical manipulation of transport channels, theoretical calculation, molecular dynamics simulation, and the superior nanofiltration performance of GO-based membranes. The challenges and prospects for future development in membrane technology are also discussed.

ACS APPLIED NANO MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Tunable Ion Transport with Freestanding Vermiculite Membranes

Zijing Xia et al.

Summary: Membranes integrating two-dimensional materials have unique ion transport properties and can be used for separation applications in both aqueous and nonaqueous systems. By tuning interlayer spacing and enhancing membrane stability, ion diffusivity can be controlled.

ACS NANO (2022)

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Article Chemistry, Multidisciplinary

Preparation of Montmorillonite Nanosheets with a High Aspect Ratio through Heating/Rehydrating and Gas-Pushing Exfoliation

Yushuan Gao et al.

Summary: In this work, a new heating/rehydrating and gas-pushing method is developed to successfully exfoliate Montmorillonite (MMT) into nanosheets with high aspect ratios. The exfoliation performance can be tuned by changing the pretreatment temperature and pH value of the hydrogen peroxide solution. This simple and low-cost method holds promise for mass production of high aspect ratio MMT nanosheets and can promote their application in various fields.

LANGMUIR (2022)

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Article Engineering, Environmental

The assembly of silica species with alkylamines: Mechanism of wastewater-free synthesis and the application of gel as a catalyst

Ruilin Wang et al.

Summary: The electrostatic attraction between negatively charged silica species and the micelles composed of the protonated amines, as well as the hydrogen bonding between neutral silica species and the micelles composed of the non-protonated amines, contribute to a coexisting assembly mechanism. This mechanism can explain the differences in morphology and properties of uncalcined amine gels.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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Article Nanoscience & Nanotechnology

Graphene oxide membranes with stable porous structure for ultrafast water transport

Wen-Hai Zhang et al.

Summary: The study presents a highly stable and ultrapermeable zeolitic imidazolate framework-8 (ZIF-8)-nanocrystal-hybridized graphene oxide membrane prepared using ice templating and in situ crystallization of ZIF-8. The selective growth of ZIF-8 in microporous defects enhances water permeability and mechanical integrity, leading to a 30-fold increase in permeability compared to graphene oxide membranes (GOms). The technique also improves permselectivity and offers potential for developing next-generation nanofiltration membranes.

NATURE NANOTECHNOLOGY (2021)

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Article Green & Sustainable Science & Technology

Graphene oxide nanofiltration membranes for desalination under realistic conditions

Zhongzhen Wang et al.

Summary: The study presents graphene oxide membranes intercalated with polyaromatic cations, showing sustainable nanofiltration performance under realistic conditions and scalability for industrial applications. The observed enhanced rejections for salts and neutral solutes in these membranes can be understood by a dual mechanism of interlayer spacing modulation and creation of diffusion barriers.

NATURE SUSTAINABILITY (2021)

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Article Engineering, Chemical

Assembly of multidimensional MXene-carbon nanotube ultrathin membranes with an enhanced anti-swelling property for water purification

Yuqing Sun et al.

Summary: The multidimensional MXene-carbon nanotube (CNT) ultrathin membranes were successfully assembled by loading a MXene intercalated with CNTs onto a tubular ceramic membrane, which considerably improved the permeability and rejection performance of the membranes. The membranes exhibited a distinct suppressed swelling property via a facile thermal crosslinking process and showed promising anti-swelling property and stability in long-term operation studies. This assembly and thermal crosslinking strategy represents a new avenue for developing high-performance membranes for water purification based on MXene and other 2D materials.

JOURNAL OF MEMBRANE SCIENCE (2021)

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Article Chemistry, Multidisciplinary

Enhanced Ion Sieving of Graphene Oxide Membranes via Surface Amine Functionalization

Yijun Qian et al.

Summary: The development of functionalized graphene oxide membranes through plasma processing offers enhanced metal ion sieving and improved efficiency in seawater desalination. The nitrogen functionalities in the membranes interact strongly with metal ions, leading to increased mono/divalent cation selectivity. Additionally, the ultrathin FGOMs exhibit high water flux and water/salt selectivity, showing great potential for various applications.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Review Environmental Sciences

A Comprehensive Review on Membrane Fouling: Mathematical Modelling, Prediction, Diagnosis, and Mitigation

Nour AlSawaftah et al.

Summary: Membrane fouling is a major obstacle in membrane separation processes, with different types including particulate, organic, inorganic, and biofouling. Factors influencing fouling propensity include surface morphology, roughness, hydrophobicity, and material of fabrication. Efficient prediction techniques and diagnostics are crucial for minimizing fouling damage in membranes.

WATER (2021)

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Article Chemistry, Physical

Ion exchange in atomically thin clays and micas

Yi-Chao Zou et al.

Summary: This study investigates the dynamics of ion exchange in atomically thin materials, revealing that ion diffusion in few-layer two-dimensional clays approaches that of free water, and superlattice cation islands can form in twisted and restacked materials.

NATURE MATERIALS (2021)

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Article Chemistry, Physical

Hydrophilic microporous membranes for selective ion separation and flow-battery energy storage

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Design of 3D-network montmorillonite nanosheet/stearic acid shape-stabilized phase change materials for solar energy storage

Hao Yi et al.

SOLAR ENERGY MATERIALS AND SOLAR CELLS (2020)

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Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

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Sharpening Nanofiltration: Strategies for Enhanced Membrane Selectivity

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ACS APPLIED MATERIALS & INTERFACES (2020)

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Two-dimensional Montmorillonite membranes with efficient water filtration

Min-Yue Huang et al.

JOURNAL OF MEMBRANE SCIENCE (2020)

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Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing

Jin Wang et al.

NATURE COMMUNICATIONS (2020)

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Controlling the Structure of MoS2 Membranes via Covalent Functionalization with Molecular Spacers

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NANO LETTERS (2020)

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Multi-functional membrane based on montmorillonite/graphene oxide nanocomposites with high actuating performance and wastewater purification

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Controllable ion transport by surface-charged graphene oxide membrane

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Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

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Preparation of Montmorillonite Nanosheets through Freezing/Thawing and Ultrasonic Exfoliation

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Nanofluidic energy conversion and molecular separation through highly stable clay-based membranes

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Spectroscopic evidence and molecular simulation investigation of the bonding interaction between lysine and montmorillonite: Implications for the distribution of soil organic nitrogen

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Molecular dynamics study of the swelling patterns of Na/Cs-, Na/Mg- montmorillonites and hydration of interlayer cations

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Montmorillonite Membranes with Tunable Ion Transport by Controlling Interlayer Spacing

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