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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Manipulating the interfacial interactions of composite membranes via a mussel-inspired approach for enhanced separation selectivity
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Manipulating the interfacial interactions of composite membranes via a mussel-inspired approach for enhanced separation selectivity

机译：通过贻贝启发方法处理复合膜的界面相互作用，以提高分离选择性

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摘要

For the broadly utilized composite membranes with dense separation layers and porous support layers, the rational manipulation of interfacial interactions between these two layers is vital in optimizing the membrane structure and the associated performance. In this study, we report a facile mussel-inspired approach to enhance the separation selectivity of composite membranes by co-depositing biomimetic adhesive dopamine and poly(ethylene imine) (PEI) on a support layer and then coating with sodium alginate (SA) as the separation layer. PEI is anchored onto the support layer surface through the reaction with dopamine during the polydopamine (PDA) formation process, thus incorporating the electrostatic attraction interaction into the interface in addition to the hydrogen bond interaction between PDA and SA. Using water/alcohol separation as the model system, the separation factor of the SA/PEI-PDA/PAN membrane can reach 1807, which is 29.6 and 6.8 times higher than those of SA/PAN and SA/PDA/PAN membranes, respectively. The remarkably enhanced separation factor arises from the optimal free volume property and swelling resistance of the membrane under the optimized interfacial interactions between the separation layer and support layer. This study may present an efficient and facile approach for tailoring the membrane structure for an enhanced separation performance.
机译：对于具有密集的分离层和多孔支撑层的广泛使用的复合膜，合理控制这两层之间的界面相互作用对于优化膜结构和相关性能至关重要。在这项研究中，我们报告了一种通过贻贝启发的方法，该方法可通过将仿生粘合剂多巴胺和聚（乙烯亚胺）（PEI）共沉积在支撑层上，然后以藻酸钠（SA）的形式涂覆，从而增强复合膜的分离选择性。分离层。 PEI通过在聚多巴胺（PDA）形成过程中与多巴胺的反应而锚固在支撑层表面，因此，除了PDA和SA之间的氢键相互作用外，还将静电吸引相互作用纳入了界面。以水/酒精分离为模型系统，SA / PEI-PDA / PAN膜的分离系数可以达到1807，分别是SA / PAN和SA / PDA / PAN膜的分离系数的29.6和6.8倍。分离系数的显着提高是由于在分离层和支撑层之间的最佳界面相互作用下，膜的最佳自由体积性质和抗溶胀性。这项研究可能会提出一种有效且简便的方法来定制膜结构以增强分离性能。

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