Precisely Tunable Ion Sieving with an Al13–Ti3C2Tx Lamellar Membrane by Controlling Interlayer Spacing
Precisely Tunable Ion Sieving with an Al13–Ti3C2Tx Lamellar Membrane by Controlling Interlayer Spacing
复制标题
通过控制层间距，使用 Al13-Ti3C2TX 层状膜进行精确可调的离子筛分
DOI：
10.1021/acsnano.0c05649
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发表时间：
2020
期刊：
影响因子：
17.1
通讯作者：
He Miaolu
中科院分区：
文献类型：
--
作者：
Zhu Jiani;Wang Lei;Wang Jin;Wang Fudi;Tian Mengtao;Zheng Shuchang;Shao Ning;Wang Lele;He Miaolu
二维（2D）膜在分子分离和运输方面表现出优异的性能，这揭示了它们在各种应用中的潜在用途。然而，由于插入引起的肿胀，2D膜的离子筛分受到严重限制。在这里，我们描述了如何有效地稳定层状结构，使用Keggin al13聚阳离子作为ti3c2txtm膜的支柱。更重要的是，层间间距可以在很宽的范围内（2.7-11.2 Å）轻松调整埃精度，以实现选择性和可调的离子筛分。窄间距膜对单价离子的选择性增强。当应用于正向渗透脱盐工艺时，该膜具有高的NaCl去除率（99%）和快速的水通量（0.30 L m-2h-1bar-1）。宽间距膜具有明显的选择性，其选择性与阳离子价有关。将该膜应用于含铁工业废水的酸回收中，表现出良好的H+/Fe2+选择性，是传统聚合物膜的理想替代品。因此，我们介绍了一种可能的途径来构建具有适当结构的二维膜，以满足不同环境，资源和能源相关应用中的不同离子筛选要求。
Two-dimensional (2D) membranes exhibit exceptional properties in molecular separation and transport, which reveals their potential use in various applications. However, ion sieving with 2D membranes is severely restrained due to intercalation-induced swelling. Here, we describe how to efficiently stabilize the lamellar architecture using Keggin Al13polycations as pillars in a Ti3C2Txmembrane. More importantly, interlayer spacing can be easily adjusted with angstrom precision over a wide range (2.7–11.2 Å) to achieve selective and tunable ion sieving. A membrane with narrowd-spacing demonstrated enhanced selectivity for monovalent ions. When applied in a forward osmosis desalination process, this membrane exhibited high NaCl exclusion (99%) with a fast water flux (0.30 L m–2h–1bar–1). A membrane with wided-spacing showed notable selectivity, which was dependent on the cation valence. When it was applied to acid recovery from iron-based industrial wastewater, the membrane showed good H+/Fe2+selectivity, which makes it a promising substitute for traditional polymeric membranes. Thus, we introduce a possible route to construct 2D membranes with appropriate structures to satisfy different ion-sieving requirements in diverse environment-, resource-, and energy-related applications.