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Development and Performance Characterization of a Polyimine Covalent Organic Framework Thin-Film Composite Nanofiltration Membrane
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acs.est.7b04056 Lauren Valentino 1 , Michio Matsumoto 2 , William R. Dichtel 2 , Benito J. Mariñas 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acs.est.7b04056 Lauren Valentino 1 , Michio Matsumoto 2 , William R. Dichtel 2 , Benito J. Mariñas 1
Affiliation
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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 ∼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.
中文翻译：
聚亚胺共价有机骨架薄膜复合纳滤膜的研制与性能表征
使用二维共价有机骨架（COF）来创建第一个具有COF活性层的不对称薄膜复合（TFC）纳滤（NF）膜。聚亚胺COF的NF膜活性层是通过对苯甲醛和三（4-氨基苯基）苯单体在聚醚砜（PES）超滤膜载体上的界面聚合（IP）合成的。卢瑟福背散射光谱法和傅立叶变换红外光谱法分析证实，存在可重复形成的厚度约10 nm的亚胺连接膜。对于模型有机化合物罗丹明-WT和背景电解质NaCl，COF NF膜的截留效率高于没有COF膜的PES载体的截留效率。这种增强的溶质截留率是具有薄COF活性层的TFC膜的首次成功演示。但是，这项工作也表明需要具有较小活性层孔的COF NF膜和替代性支撑材料。前者应导致更大的溶质截留率，而后者则是关键，因为用于支撑在COF膜中的PES与用于COF IP工艺的有机溶剂不相容。
更新日期：2017-12-06
中文翻译：
聚亚胺共价有机骨架薄膜复合纳滤膜的研制与性能表征
使用二维共价有机骨架（COF）来创建第一个具有COF活性层的不对称薄膜复合（TFC）纳滤（NF）膜。聚亚胺COF的NF膜活性层是通过对苯甲醛和三（4-氨基苯基）苯单体在聚醚砜（PES）超滤膜载体上的界面聚合（IP）合成的。卢瑟福背散射光谱法和傅立叶变换红外光谱法分析证实，存在可重复形成的厚度约10 nm的亚胺连接膜。对于模型有机化合物罗丹明-WT和背景电解质NaCl，COF NF膜的截留效率高于没有COF膜的PES载体的截留效率。这种增强的溶质截留率是具有薄COF活性层的TFC膜的首次成功演示。但是，这项工作也表明需要具有较小活性层孔的COF NF膜和替代性支撑材料。前者应导致更大的溶质截留率，而后者则是关键，因为用于支撑在COF膜中的PES与用于COF IP工艺的有机溶剂不相容。
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