Recent studies have emphasized the importance of porous substrates in the formation of a polyamide layer during the interfacial polymerization process. However, few studies have focused on the underlying effect of the porous support substrate on the structure and properties of the prepared polyamide nanofiltration (NF) membrane. In this study, various polyketone (PK) porous substrate supported NF membranes were successfully fabricated and optimized by tuning the pore structure and surface roughness of the PK substrate layer. Structural optimization was achieved by changing only the PK casting solution concentration during nonsolvent-induced phase separation without additional modification steps. The results demonstrated that the prepared hydrophilic fibrous PK membrane was conducive for the rapid and even diffusion of amine monomers and was an ideal substrate for NF membranes. Compared to the PK-16-supported NF membrane, a polyamide film with a more ridge-shaped nanostrip structure was easily formed on the PK-8 substrate with a large pore size and rougher surface, which greatly improved the permeance of the resultant NF membrane with a slight loss in salt rejection. Each PK substrate-supported NF membrane showed competitive separation performance compared to that of several reported membranes. This study highlights the superiority of PK porous membranes and provides a simple strategy for NF membrane production and water treatment applications.

最近的研究强调了多孔基材在界面聚合过程中形成聚酰胺层的重要性。然而，很少有研究关注多孔支撑基材对制备的聚酰胺纳滤 (NF) 膜的结构和性能的潜在影响。在这项研究中，通过调整孔结构成功地制造和优化了各种聚酮 (PK) 多孔基板支持的 NF膜PK衬底层的表面粗糙度。结构优化是通过在非溶剂诱导的相分离过程中仅改变 PK 铸造溶液浓度而无需额外的修改步骤来实现的。结果表明，所制备的亲水性纤维PK膜有利于胺类单体的快速均匀扩散，是纳滤膜的理想底物。与 PK-16 支持的 NF 膜相比，聚酰胺在孔径大、表面粗糙的PK-8基材上容易形成脊状纳米带结构的膜，大大提高了纳滤膜的渗透性，脱盐率略有下降。与几种报道的膜相比，每种 PK 底物支持的 NF 膜都显示出具有竞争力的分离性能。本研究突出了 PK 多孔膜的优越性，并为纳滤膜生产和水处理应用提供了一种简单的策略。