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基于多巴薄壁微囊制备无缺陷有机溶剂纳滤膜

作者：时飞李红英李奕帆

单位：郑州大学化工学院，郑州 450001

关键词：薄膜复合膜；界面阻力；薄壁微囊；有机溶剂纳滤

DOI号：

分类号： TQ 028.8

出版年,卷(期):页码： 2021,41(6):85-94

摘要：

薄膜复合膜（TFCM）因其高的分离性能而在低分子量物系的分离中有着广泛的应用。然而，在其制备过程中支撑层近表面区域常形成阻力集中区而降低膜的通量。基于此，本工作制备了具有二维性质的柔性多巴（Dopa）薄壁微囊并使其在支撑体上组装成膜，同时微囊柔性的特质可以使其进行无缺陷组装。这种使用介观尺度的有机构造子的制膜方法可以减小支撑层界面区域的附加阻力，所制备的Dopa复合膜在有机溶剂纳滤领域展现出较好的分离性能，其对甲醇的通量达到了440 L m-2 h-1 bar-1，对大于2 nm的染料分子的截留量达到95%以上，同时，Dopa复合膜表现出较好的稳定性，为制备无缺陷TFCM提供了一种新的思路。

Thin film composite membrane (TFCM) has a wide range of applications in the separation of low molecular weight systems due to its high separation performance. However, the near surface area of the support layer often suffers from a resistance concentration area during its preparation process, which reduces the separation performance of the membrane. Based on this, this work has prepared flexible two-dimensional Dopa thin-walled microcapsules, which was assembled on the support to prepare a film. And the flexibility of the microcapsules allows it to be assembled without defects. This method can reduce the additional resistance in the interface area of film by using mesoscopic organic constructor. The Dopa composite membrane exhibits good performance for organic solvent nanofiltration, and its methanol permeance reaches 440 L m-2 h-1 bar-1 with the retention of dye molecules which larger than 2 nm more than 95%. At the same time, the Dopa composite membrane shows good operational stability. This method paves a new way for the preparation of defect-free TFCM.

基金项目：

国家自然科学基金（21878277，21506196）。

作者简介：

时飞（1996-），男，山东省菏泽市人，硕士研究生，主要研究方向为膜分离技术，E-mail 1591448684@qq.com

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