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Engineering novel high-flux thin-film composite (TFC) hollow fiber nanofiltration membranes via a facile and scalable coating procedure
Desalination ( IF 9.9 ) Pub Date : 2022-01-04 , DOI: 10.1016/j.desal.2021.115531
Chuanfeng Wang 1 , Yingbo Chen 1 , Xiaoyu Hu 2 , Pengfei Guo 1
Affiliation  

A novel defect-free polyamide/(polyether sulfone/poly(vinylidene fluoride)) PA/(PES/PVDF) thin-film composite (TFC) hollow fiber membrane (HFM) with desirable separation characteristics were developed through a facile and scalable coating procedure. By the introduction of piperazine (PIP) monomers into the PES coating solutions, the functional monomer-enriched PES coating layer was formed on the shell side of porous matrix-reinforced hollow fiber (HF) support through phase inversion process. Subsequently, PIP and TMC was interfacial polymerized during the fiber coating line to form a thin and defect-free polyamide (PA) functional layer for TFC HFM with high water permeability. Furthermore, the introduction of aqueous monomers only into the PES layer allowed economizing the cost of membrane manufacturing compared with bulk modification of the membrane substrate. Interestingly, the formation of bowl-like structures endowed the separation layer with higher permeation surface area and thus favored high water permeability. On combining these separation features, the optimized TFC membranes presented a high pure water permeability (PWP) of 13.8 L·m−2·h−1·bar−1, approximately twice than that of conventional TFC membrane, with a satisfying Na2SO4 rejection of 98.2%. Moreover, the PA/(PES/PVDF) TFC HFM exhibited excellent stability, backwash ability and anti-fouling ability, suggesting its huge potential for the water purification. Compared with the conventional two-step IP process on flat sheet membrane, the in-situ IP procedure performed on HF greatly simplifies the manufacturing process, shortens the production period and reduces monomer usage while the high packing density and great surface area per unit volume are obtained. This work may provide a simple and economical strategy for engineering high-performance TFC HFM.



中文翻译:

通过简便且可扩展的涂层程序设计新型高通量薄膜复合材料 (TFC) 中空纤维纳滤膜

一种新型的无缺陷聚酰胺/(聚醚砜/聚(偏二氟乙烯))PA/(PES/PVDF)薄膜复合(TFC)中空纤维膜(HFM)具有理想的分离特性. 通过将哌嗪 (PIP) 单体引入 PES 涂层溶液中,通过相转化过程在多孔基体增强中空纤维 (HF) 载体的壳侧形成富含功能单体的 PES 涂层。随后,PIP 和 TMC 在纤维涂层生产线上进行界面聚合,形成薄且无缺陷的聚酰胺 (PA) 功能层,用于具有高透水性的 TFC HFM。此外,与膜基材的批量改性相比,仅将水性单体引入 PES 层可以节省膜制造成本。有趣的是,碗状结构的形成赋予分离层更高的渗透表面积,从而有利于高透水性。结合这些分离特性,优化的 TFC 膜呈现出 13.8 L·m 的高纯水渗透率 (PWP)-2 ·h -1 ·bar -1,大约是传统TFC 膜的两倍,具有令人满意的98.2% 的Na 2 SO 4截留率。此外,PA/(PES/PVDF) TFC HFM表现出优异的稳定性、反冲洗能力和抗污染能力,表明其在水净化方面的巨大潜力。与传统的平板膜两步IP工艺相比,在HF上进行的原位IP工艺大大简化了制造工艺,缩短了生产周期,减少了单体用量,同时具有高堆积密度和单位体积大表面积获得。这项工作可能为设计高性能 TFC HFM 提供一种简单且经济的策略。

更新日期:2022-01-04
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