Abstract A unique method for the preparation of cellulose-polyethyleneimine (PEI) blend membranes for nanofiltration is presented. Trimethylsilyl cellulose was used as a precursor for the blend membrane fabrication followed by a simple hydrolysis to regenerate the cellulose structure. The resulting homogeneous blend membranes exhibited high neutral solute rejection in water, which was surprisingly better than the performance of the individual membranes due to the strong interactions between the blended polymers. More interestingly, the same membrane demonstrated over five times higher flux of methanol after solvent activation with water as compared to the fluxes of the pure membranes, attributed to formation of nanocracks. High rejection of negatively charged dyes in this solvent with around 450 Da molecular weight cut-off was obtained at an exceptionally high flux of 160 Lm−2 h−1 at a pressure of 4.5 bar. The membranes will be beneficial in nanofiltration of polar solvents containing neutral and charged molecules.

中文翻译：

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纤维素 - 具有异常纳滤性能的聚乙烯亚胺混合膜

摘要 提出了一种制备用于纳滤的纤维素-聚乙烯亚胺 (PEI) 共混膜的独特方法。三甲基甲硅烷基纤维素用作混合膜制造的前体，然后进行简单的水解以再生纤维素结构。所得均质共混膜在水中表现出高中性溶质截留率，由于共混聚合物之间的强相互作用，这令人惊讶地优于单个膜的性能。更有趣的是，由于纳米裂纹的形成，与纯膜的通量相比，相同的膜在用水溶剂活化后表现出高出五倍以上的甲醇通量。在 4.5 bar 的压力下以 160 Lm-2 h-1 的异常高通量获得了该溶剂中带负电荷染料的高截留率，截留分子量约为 450 Da。该膜将有利于含有中性和带电分子的极性溶剂的纳滤。