Development and Performance Characterization of a Polyimine Covalent Organic Framework Thin-Film Composite Nanofiltration Membrane
Development and Performance Characterization of a Polyimine Covalent Organic Framework Thin-Film Composite Nanofiltration Membrane
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DOI：
10.1021/acs.est.7b04056
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发表时间：
2017-12-19
影响因子：
11.4
通讯作者：
Marinas, Benito J.
中科院分区：
文献类型：
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作者：
Valentino, Lauren;Matsumoto, Michio;Marinas, Benito J.
利用二维共价有机骨架(COF)制备了第一个具有COF活性层的不对称薄膜复合纳滤膜(NF膜)。通过对苯二甲醛和三(4-氨基苯基)苯单体在聚醚砜(PES)超滤膜载体上的界面聚合，合成了聚亚胺COF的纳滤膜活性层。卢瑟福背散射光谱和傅里叶变换红外光谱分析证实了亚胺连接薄膜的存在，该薄膜的厚度约为10 nm，并且可重复形成。COF纳滤膜对模型有机化合物罗丹明-WT和背景电解液NaC l的截留效率高于不加COF膜的PES载体。这种增强的溶质截留率是第一次成功地展示了具有薄COF活性层的TFC膜。然而，这项工作也证明了具有更小的活性层孔和替代支撑材料的COF纳滤膜的必要性。前者应该会导致更大的溶质截留率，而后者是关键，因为用于支撑COF膜的PES与用于COF IP过程的有机溶剂不相容。
Two-dimensional covalent organic frameworks (COFs) were used to create the first asymmetric, thin-film composite (TFC) nanofiltration (NF) membrane with a COF active layer. NF membrane active layers of polyimine COF were synthesized via the interfacial polymerization (IP) of terephthalaldehyde and tris(4-aminophenyl)benzene monomers on top of a poly(ether sulfone) (PES) ultrafiltration membrane support. Rutherford backscattering spectrometry and Fourier transform infrared spectroscopy analyses confirmed the presence of an imine-linked film with a thickness of similar to 10 nm that was formed reproducibly. The rejection efficiencies of the COF NF membrane for a model organic compound, Rhodamine-WT, and a background electrolyte, NaCl, were higher than those of the PES support without the COF film. This enhanced solute rejection is the first successful demonstration of a TFC membrane with a thin COF active layer. However, this work also demonstrates the need for COF NF membranes with smaller active layer pores and alternative support materials. The former should result in greater solute rejection, and the latter is key because the PES used for support in the COF membranes is incompatible with the organic solvents used for the COF IP process.