A Two-Dimensional Lamellar Vermiculite Membrane for Precise Molecular Separation and Ion Sieving
A Two-Dimensional Lamellar Vermiculite Membrane for Precise Molecular Separation and Ion Sieving
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用于精确分子分离和离子筛分的二维层状蛭石膜
DOI：
10.1021/acssuschemeng.1c05951
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发表时间：
2022-01-11
影响因子：
8.4
通讯作者：
Wang, Lele
中科院分区：
文献类型：
--
作者：
Tian, Mengtao;Wang, Lei;Wang, Lele
由二维（2D）纳米片构建的层状膜表现出非凡的允许特性。然而，它们的复杂和污染物纳米片的合成，低结构稳定性和低化学耐药性严重限制了工业规模的生产和实际应用。本文评估了稳定性，分子分离，离子蛋白质特性和广泛的适用性，以证明2D毛石（VMT）纳米材料在高性能膜开发中的应用潜力。首先，通过轻松的过程，从广泛发生的天然粘土中制备了平均侧向尺寸的大型2D VMT纳米片，即使在恶劣的环境中，2D Lamellar VMT膜在恶劣的环境中也显示出极好的长期稳定性超声浴。此外，VMT膜在染料分子的有利保留率和表面电荷的离子传输行为上显示出快速溶剂的渗透率，这是由于带负电荷的纳米渠道，表明分子分离和离子筛分的潜力。此外，还使用针对其他2D膜开发的简单插入优化策略确认了VMT膜的广泛适用性。在这些发现的基础上，我们的工作为能源和环境应用的高级膜开发提供了可能的途径。
Lamellar membranes constructed from two-dimensional (2D) nanosheets have exhibited exceptional permselective characteristics. However, their complex and contaminative nano-sheet synthesis, low structural stability, and low chemical resistance severely limit industrial-scale production and practical applications. Herein, the stability, molecular separation, ion-sieving properties, and broad applicability were evaluated to demonstrate the application potential of 2D vermiculite (VMT) nanomaterials in high-performance membrane development. First, the large-scale 2D VMT nanosheets with average lateral sizes of similar to 12 mu m were prepared from the widely occurring natural clay via a facile procedure, and the 2D lamellar VMT membrane showed excellent long-term stability in harsh environments, even in an ultrasonic bath. Furthermore, the VMT membrane showed fast solvent permeance with a favorable retention rate of dye molecules and a surface charge-governed ionic transport behavior because of the negatively charged nanochannel, indicating the potential in both molecule separation and ion sieving. Moreover, the broad applicability of the VMT membrane was also confirmed using a simple intercalation optimizing strategy developed for other 2D membranes. Building on these findings, our work shows a possible route to the development of advanced membranes for energy and environmental applications.