Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing 210098, China.
Sci Total Environ. 2023 Jan 15;856(Pt 1):158434. doi: 10.1016/j.scitotenv.2022.158434. Epub 2022 Sep 6.
The introduce of a nanomaterial interlayer between the substrate and polyamide is identified as a promising strategy to construct highly performed membranes. Two-dimensional (2D) materials are potential candidates as interlayer for advanced thin-film nanocomposite interlayer (TFNi) membranes. Nevertheless, low permeability, selectivity and long-term stability are still critical issues in TFNi membrane manufacture. Herein, a scalable approach for constructing TFNi membranes was implemented using stacked MXene nanosheets as interlayer, wherein the FeO nanoparticles worked as the sacrificial template to regulate the interlayer spacing of the 2D channels. SEM, XPS, water contact angle, and zeta potential were used to characterize the physical and chemical properties of prepared TFNi membranes, and the results shows that the presence of MXene interlayer increased the hydrophilicity, thinness and roughness of polyamide layer compared to that of pure TFC membranes. Besides, the enlarged interlayer channel after the sacrifice of the FeO nanoparticles greatly boosted the transport of the water molecules. The resultant membranes exhibited nearly double fold of water flux (66.4 ± 3.45 L·m·h) and higher selective separation factor (48.4) compared with those prepared without interlayer, while the outstanding salt rejection (>97 %) was maintained. This work achieves an innovative strategy for multifunctional polyamide nanofiltration membrane construction.
在基底和聚酰胺之间引入纳米材料夹层被认为是构建高性能膜的一种有前途的策略。二维（2D）材料是作为先进的薄膜纳米复合夹层（TFNi）膜中间层的潜在候选材料。然而，低渗透性、选择性和长期稳定性仍然是 TFNi 膜制造中的关键问题。在此，使用堆叠的 MXene 纳米片作为夹层，实施了一种可扩展的构建 TFNi 膜的方法，其中 FeO 纳米颗粒作为牺牲模板来调节 2D 通道的层间距。SEM、XPS、水接触角和 Zeta 电位用于表征制备的 TFNi 膜的物理和化学性质，结果表明，与纯 TFC 膜相比，MXene 夹层的存在增加了聚酰胺层的亲水性、薄膜和粗糙度。此外，FeO 纳米颗粒牺牲后扩大的层间通道极大地促进了水分子的传输。与没有夹层制备的膜相比，所得膜的水通量（66.4 ± 3.45 L·m·h）提高了近一倍，选择性分离因子（48.4）更高，而出色的盐截留率（>97%）得以保持。这项工作实现了一种用于多功能聚酰胺纳滤膜构建的创新策略。
