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    李贵亮, 方齐乐, 刘富. 二维共价三嗪框架膜的制备及其分子分离性能[J]. 功能高分子学报, 2019, 32(5): 610-616. doi: 10.14133/j.cnki.1008-9357.20190429002
    引用本文: 李贵亮, 方齐乐, 刘富. 二维共价三嗪框架膜的制备及其分子分离性能[J]. 功能高分子学报, 2019, 32(5): 610-616. doi: 10.14133/j.cnki.1008-9357.20190429002
    LI Guiliang, FANG Qile, LIU Fu. Synthesis of Two-Dimensional Covalent Triazine Framework Membranes and Study on Their Separation Performances[J]. Journal of Functional Polymers, 2019, 32(5): 610-616. doi: 10.14133/j.cnki.1008-9357.20190429002
    Citation: LI Guiliang, FANG Qile, LIU Fu. Synthesis of Two-Dimensional Covalent Triazine Framework Membranes and Study on Their Separation Performances[J]. Journal of Functional Polymers, 2019, 32(5): 610-616. doi: 10.14133/j.cnki.1008-9357.20190429002

    二维共价三嗪框架膜的制备及其分子分离性能

    Synthesis of Two-Dimensional Covalent Triazine Framework Membranes and Study on Their Separation Performances

    • 摘要: 二维共价三嗪框架材料(2D-CTF)可作为一类理想的二维分离膜基元体。本文利用微界面法制备了具有寡层结构的2D-CTF-1纳米材料,并以其为基元体构筑超薄层状2D-CTF-1分离膜。采用傅里叶红外光谱、X射线光电子能谱、原子力显微镜、透射电子显微镜和扫描电子显微镜对2D-CTF-1纳米材料及其组装成的分离膜进行结构与形貌表征,并测试2D-CTF-1分离膜在不同压力下的纯水通量以及对染料小分子的分离性能。结果表明:2D-CTF-1分离膜的纯水通量可达153.7 L/(m2·h)(25 ℃,0.1 MPa),二维面内结构孔为主要的水分子传输通道,对染料小分子刚果红的渗透通量为132.5 L/(m2·h)(25 ℃,0.1 MPa),截留率为98.3%。2D-CTF-1分离膜在长时间连续运行后仍能维持较高通量和96%以上的截留率,是一类极具潜力的新型二维分离膜材料。

       

      Abstract: Two-dimensional covalent triazine framework material (2D-CTF) is a kind of covalent organic framework material with triazine ring structure consisting of C and N elements, which is considered to be a type of ideal membrane material due to its excellent structural stability and adjustable in-plane nanopore. In this study, few-layers 2D-CTF-1 nanomaterials were prepared using a micro-interface method based on the polymerization of 1,4-dicyanobenzene. The resulting few-layers 2D-CTF-1 nanosheets were used as building blocks to construct 2D-CTF-1 membrane via a layer-by-layer assembly method. The structure and morphology of the prepared 2D-CTF-1 nanosheets and membrane were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, transmission electron microscopy and scanning electron microscopy. The pure water flux under different pressures and the separation performances of 2D-CTF-1 membrane for small organic dye molecules were tested. The results show that 2D-CTF-1 membrane possesses high pure water flux(153.7 L/(m2·h)) (25 ℃, 0.1 MPa), and the in-plane nanopores of 2D-CTF-1 are proposed as the main transport channels for water molecules. Besides, the 2D-CTF-1 membrane exhibits high flux (132.5 L/(m2·h)) (25 ℃, 0.1 MPa) and high rejection rate (98.3%) for separation of organic dye (Congo red). The membrane still shows high flux and rejection after a long-term operation. Thus, 2D-CTF-1 is a promising 2D separation membrane material for high efficient molecular separation.

       

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