Kaushik Ashwini, Dhundhiyawala Mansoor, Dobariya Priyanka, Marvaniya Karan, Kushwaha Shilpi, Patel Ketan
Membrane Science and Separation Technology Division, CSIR Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India.
iScience. 2022 May 23;25(6):104441. doi: 10.1016/j.isci.2022.104441. eCollection 2022 Jun 17.
Polymeric membranes with high permeance and selectivity performances are anticipated approach for water treatment. Separation membranes with moderate molecular weight cut-offs (MW in between 400 and 700 g mol) are desirable to separate multivalent ions and small molecules from a water stream. This requires polymeric membranes with controlled pore, pore size distribution, surface charge, and thin active layer to maximize membrane performance. Here, a fabrication of the polyaryl nanofilm with thickness down to ∼15 nm synthesized using interfacial polymerization onto ultrafiltration supports is described. Electron microscopy analysis reveals the presence of crumpled surface morphology in polyaryl nanofilm. Polyaryl nanofilm shows high water permeance of ∼110 Lmh bar. Polyaryl nanofilm presents molecular weight cut-off greater than ∼450 gmol (molecular marker) with water permeance of ∼84 Lmh bar. Multivalent salt (K[Fe(CN)]) has higher rejection (>95%) as compared to the monovalent (∼5%) and divalent salt (∼28%) with the water permeance of ∼81 Lmh bar.
具有高渗透性能和选择性的聚合物膜是水处理的理想方法。具有中等截留分子量（分子量在400至700 g/mol之间）的分离膜对于从水流中分离多价离子和小分子是理想的。这需要具有可控孔径、孔径分布、表面电荷和薄活性层的聚合物膜，以最大化膜性能。在此，描述了一种在超滤载体上通过界面聚合合成厚度低至约15 nm的聚芳基纳米膜的制备方法。电子显微镜分析揭示了聚芳基纳米膜中存在皱缩的表面形态。聚芳基纳米膜显示出约110 Lmh bar的高水渗透率。聚芳基纳米膜的截留分子量大于约450 g/mol（分子标记物），水渗透率约为84 Lmh bar。与单价盐（约5%）和二价盐（约28%）相比，多价盐（K[Fe(CN)]）具有更高的截留率（>95%），水渗透率约为81 Lmh bar。
