The demand of nanofiltration (NF) membranes for practical and cost‐effective environmental treatment is exploding. Mixed matrix membranes (MMMs) have attracted tremendous interest on account of combining the benefits of polymer and inorganic fillers. In this study, mesoporous silica thin films with perpendicular nanochannels (SBA‐15(⊥)) incorporated in chitosan (CS) were fabricated for dye wastewater purification. Functional groups, such as amino or epoxy groups were introduced into SBA‐15(⊥) (SBA‐15(⊥)‐NH₂, SBA‐15(⊥)‐Epo) for forming covalent bonds with chitosan matrix to improve their compatibility. The excellent performance in dye/salt fractionation in aqueous solution was demonstrated by SBA‐15(⊥)‐Epo/CS MMMs, which realized a cut off of 585 g/mol, 99.9% rejection of Congo red, while maintaining 85% permeation of NaCl. In addition, the separation mechanism of the resulting membrane was explored. The efficient NF performance of SBA‐15(⊥)‐Epo/CS membrane was attributed to its better compatibility between SBA‐15(⊥)‐Epo and chitosan matrix by virtue of the formation of covalent bonds thus to ensure the high dye rejection, and the vertically oriented nanochannels arrangement facilitated the molecule transportation. This work will inspire feasible synthesis of a new generation of MMMs membranes for dye wastewater purification.

中文翻译：

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介孔二氧化硅薄膜与壳聚糖混合基质纳滤膜的结合，用于纺织废水处理

实用和经济高效的环境处理对纳滤（NF）膜的需求呈爆炸式增长。由于结合了聚合物和无机填料的优点，混合基质膜（MMM）引起了极大的兴趣。在这项研究中，制备了具有垂直纳米通道（SBA-15（⊥））并入壳聚糖（CS）的中孔二氧化硅薄膜，用于染料废水的净化。氨基或环氧基等官能团被引入SBA-15（⊥）（SBA-15（⊥）-NH ₂，SBA-15（⊥）-Epo）与壳聚糖基质形成共价键，以提高它们的相容性。SBA-15（⊥）-Epo / CS MMMs证明了在水溶液中染料/盐分馏方面的优异性能，该产品的截留分子量为585 g / mol，刚果红的截留率为99.9％，同时保持了85％的刚果红渗透率。氯化钠 另外，探索了所得膜的分离机理。SBA-15（⊥）-Epo / CS膜的有效NF性能归因于SBA-15（⊥）-Epo和壳聚糖基质之间的共价键形成，从而确保了较高的染料截留率，从而使其具有更好的相容性。垂直方向排列的纳米通道有助于分子的运输。这项工作将激发用于染料废水净化的新一代MMM膜的可行合成。