Tiwari Karishma, Modak Solagna, Sarkar Pulak, Ray Santanu, Adupa Vasista, Reddy K Anki, Pramanik Sumit Kumar, Das Amitava, Karan Santanu
Analytical and Environmental Science Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar, Gujarat 364002, India.
Department of Chemistry, School of Basic & Applied Sciences, Galgotias University, Greater Noida, Uttar Pradesh 203201, India.
iScience. 2022 Mar 4;25(4):104027. doi: 10.1016/j.isci.2022.104027. eCollection 2022 Apr 15.
Thin film membranes of covalent organic frameworks are promising for high-permeance molecular separation. However, their synthesis needs a high temperature or longer reaction time, unsuitable for large-scale fabrication of thin film composite membranes. The ultrathin film of porous organic polymers as a separation layer of the composite membrane could be a close alternative to COF membranes. Here we report transition metal ion-catalyzed room temperature fabrication of the ultrathin (≈12 nm) polyimine nanofilms via interfacial polymerization of melamine and triformylphloroglucinol onto hydrolyzed polyacrylonitrile support within a short reaction time. Composite membranes exhibit high water permeance (≈78 L m h bar), high rejection (99.6%) of brilliant blue R (825.9 g mol), low rejection of NaCl (≈1.8%) and NaSO (≈17%), and enable efficient molecular separation. The role of metal ion catalysts for large-area fabrication of the ultrathin polyimine nanofilm membranes used for molecular separation is demonstrated.
共价有机框架的薄膜有望用于高渗透率的分子分离。然而，它们的合成需要高温或更长的反应时间，不适用于大规模制备复合薄膜。多孔有机聚合物的超薄膜作为复合膜的分离层可能是共价有机框架膜的一种相近替代物。在此，我们报道了通过三聚氰胺和均苯三甲醛在水解聚丙烯腈载体上的界面聚合，在短反应时间内实现过渡金属离子催化室温制备超薄膜（约12纳米）聚亚胺纳米膜。复合膜表现出高透水率（约78升·米⁻²·小时⁻¹·巴⁻¹）、对亮蓝R（825.9克·摩尔⁻¹）的高截留率（99.6%）、对氯化钠（约1.8%）和硫酸钠（约17%）的低截留率，并能实现高效分子分离。证明了金属离子催化剂在用于分子分离的超薄膜聚亚胺纳米膜大面积制备中的作用。
