Biomass-based membranes have attracted increasing attentions due to their cheap and sustainable advantages. In this work, a novel thin-film composite (TFC) nanofiltration (NF) membrane was fabricated through a facial interfacial polymerization (IP) process by initiate the crosslinking reaction between collagen fibers (CFs) and tannic acid (TA). The increased TA concentrations endowed the TFC membrane with a higher crosslinking degree, a thicker active layer and a rougher top surface. At optimized condition with 0.60 mg TA decoration, the TFC-3 membrane exhibited a high water permeability of 23.49 L m−2 h−1 bar−1 with high rejections above 98.0% for congo red, reactive blue 19, coomassie blue G-250, and methyl blue. Furthermore, the membrane preserved remarkable salt retentions (93.3% for Na2SO4, 83.4% for MgSO4, 36.2% for MgCl2, and 26.4% for NaCl) and satisfying operation stability. This facial fabrication method offered a new insight to employ biomass for molecular precise separation.

中文翻译：

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具有单宁酸配位胶原纤维的复合纳滤膜可增强分子分离

生物质膜因其廉价和可持续的优势而受到越来越多的关注。在这项工作中，通过引发胶原纤维（CF）和单宁酸（TA）之间的交联反应，通过面部界面聚合（IP）工艺制造了一种新型薄膜复合（TFC）纳滤（NF）膜。TA浓度的增加使TFC膜具有更高的交联度、更厚的活性层和更粗糙的顶面。在使用 0.60 mg TA 修饰的优化条件下，TFC-3 膜表现出 23.49 L m−2 h−1 bar−1 的高透水性，对刚果红、活性蓝 19、考马斯蓝 G-250 的截留率高于 98.0%和甲基蓝。此外，膜保留了显着的盐保留率（Na2SO4为93.3％，MgSO4为83.4％，MgCl2为36.2％，NaCl为26.4％）并且满足运行稳定性。这种面部制造方法为利用生物质进行分子精确分离提供了新的见解。