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Constructing large loadings of dual pathways with Ti3C2Tx-CDs in thin film nanocomposite membrane for enhanced organic permeation
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.memsci.2020.118872
Lan Hao , Zexu Chi , Qingbai Chen , Haoqin Zhang , Jianyou Wang

Abstract Dual pathways hold great superiority in facilitating molecular permeation for various separation applications. However, the existing dual-pathway nanostructure fails in realizing large loadings of dual pathways and hence limited molecular permeation. Here, cyclodextrins (CDs) with hydrophilic exterior surface but strong hydrophobic interior cavity are utilized and anchored on Ti3C2Tx nanosheets, thus constructing large loadings of dual pathways. The resultant building blocks (Ti3C2Tx-CDs) are integrated into hydrophilic polyethyleneimine (PEI) matrixes to prepare thin film nanocomposite (TFN) membranes. Ti3C2Tx-CDs offer the advantage of forming large loadings of dual pathways by anchoring quantities of CDs on Ti3C2Tx nanosheets, thanks to the abundant –OH groups of Ti3C2Tx nanosheets. The hydrophobic internal cavities of CDs work as transfer highways for nonpolar solvents, while hydrophilic PEI matrixes afford for polar solvents, imparting to the membranes enhanced organic permeation. For isopropanol, TFN-Ti3C2Tx-β-CDs attains the permeation of 3.8 L m−2 h−1 bar−1. For n-heptane, more striking augment in permeation is observed for TFN-Ti3C2Tx-β-CDs, reaching 2.7 L m−2 h−1 bar−1, 9 times of control membrane (TFN-Ti3C2Tx) value. Moreover, these TFN membranes display superior structural stability, guaranteeing great potential for applications in sophisticated organic solvent systems.

中文翻译:

在薄膜纳米复合膜中用 Ti3C2Tx-CDs 构建大量负载的双通路以增强有机渗透

摘要 双通道在促进各种分离应用的分子渗透方面具有极大的优势。然而,现有的双通路纳米结构无法实现双通路的大负载,因此分子渗透受到限制。在这里,具有亲水外表面和强疏水内腔的环糊精 (CD) 被利用并锚定在 Ti3C2Tx 纳米片上,从而构建了大量负载的双通路。将所得构件 (Ti3C2Tx-CDs) 整合到亲水性聚乙烯亚胺 (PEI) 基质中以制备薄膜纳米复合材料 (TFN) 膜。由于 Ti3C2Tx 纳米片上丰富的 –OH 基团,Ti3C2Tx-CD 具有通过将大量 CD 锚定在 Ti3C2Tx 纳米片上而形成大量双通路负载的优势。CDs 的疏水性内腔作为非极性溶剂的传输通道,而亲水性 PEI 基质提供极性溶剂,赋予膜增强的有机渗透。对于异丙醇,TFN-Ti3C2Tx-β-CDs 的渗透率为 3.8 L m-2 h-1 bar-1。对于正庚烷,观察到 TFN-Ti3C2Tx-β-CDs 的渗透增加更显着,达到 2.7 L m-2 h-1 bar-1,是对照膜 (TFN-Ti3C2Tx) 值的 9 倍。此外,这些 TFN 膜显示出卓越的结构稳定性,保证了在复杂有机溶剂系统中的巨大应用潜力。观察到 TFN-Ti3C2Tx-β-CDs 的渗透增加更显着,达到 2.7 L m-2 h-1 bar-1,是对照膜 (TFN-Ti3C2Tx) 值的 9 倍。此外,这些 TFN 膜显示出卓越的结构稳定性,保证了在复杂有机溶剂系统中的巨大应用潜力。观察到 TFN-Ti3C2Tx-β-CDs 的渗透增加更显着,达到 2.7 L m-2 h-1 bar-1,是对照膜 (TFN-Ti3C2Tx) 值的 9 倍。此外,这些 TFN 膜显示出卓越的结构稳定性,保证了在复杂有机溶剂系统中的巨大应用潜力。
更新日期:2021-02-01
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