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基膜表面孔隙率对聚酰胺复合纳滤膜性能的影响

作者：高蔓彤，王升欢，刘继桥，何本桥

单位：分离膜与膜过程国家重点实验室，材料科学与工程学院，天津工业大学，天津 300387

关键词：复合纳滤膜；PES超滤膜；表面孔隙率；分离性能

DOI号：

分类号： TQ051.893

出版年,卷(期):页码： 2022,42(5):64-69

摘要：

本文采用原位纳米气泡辅助非溶剂诱导相转化（BNIPS）法制得了表面孔尺寸相近（8.29 - 9.20 nm）、但表面孔隙率相差5倍的系列聚醚砜基膜，并在其表面进行界面聚合制备纳滤膜，探究基膜表面孔隙率对纳滤膜结构和分离性能的影响。结果表明，随着基膜表面孔隙率增加，纳滤膜聚酰胺层厚度降低、亲水性增强、膜表面荷负电性降低。与对照样相比，纳滤膜水渗透系数最大提高2.7倍，且对无机盐截留性能也有所提高。这是由于孔隙率更高和孔径分布更均一的基膜有助于界面聚合中哌嗪（PIP）溶液在其表面均匀分布，形成更薄更均一的聚酰胺分离层，另外基膜高孔隙率也有利于降低水侧向传输阻力，显著提升了纳滤膜分离性能。

A series of polyethersulfone (PES) membranes with similar surface pore size（8.29 - 9.20 nm） but five times difference in surface porosity were prepared through in-situ nano bubble assisted non-solvent induced phase separation (BNIPS) method. The PES membranes were employed as supporting membranes to prepare nanofiltration (NF) membranes by interfacial polymerization. The effects of surface porosity on the structure and separation performance of NF membrane were investigated. The results show that with the increase of the surface porosity of the supporting membrane, the polyamide layer thickness of the NF membrane decreases; the hydrophilicity increased; the negative Zeta potential on the membrane surface decreased. Compared with the control, the water permeance of the NF membrane was increased by 2.7 times, and the rejection of inorganic salts was also improved. This was because the supporting membrane with higher porosity and more uniform pore size distribution was conducive to the uniform distribution of piperazine solution on its surface during interfacial polymerization, so as to form a thinner and more uniform polyamide separation layer, which significantly improved the separation performance of nanofiltration membrane. At the same time, the high porosity on the surface of the support membrane was also conducive to reducing the lateral resistance of water flow.

基金项目：

国家自然科学基金项目（22178268、21776218）；天津市科技计划支持（21ZYJDSN00130）

作者简介：

高蔓彤（1997－），女，甘肃酒泉人，硕士研究生，主要研究方向为聚合物分离膜制备；E-mail：13512212508@139.com

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