02426nas a2200241   4500008004100000022001400041245017000055210006900225260000800294300001600302490000700318520150000325653003101825653001701856653003101873653003501904653002701939100002601966700002201992700001702014700002202031856013102053       2024                        eng d  a1944-824400aScalable, interfacially synthesized, covalent-organic framework (COF)-based thin-film composite (TFC) hollow fiber membranes for organic solvent nanofiltration (OSN)0 aScalable interfacially synthesized covalentorganic framework COF  cAPR  a19463-194710 v163 a<p>
	Covalent organic frameworks have great potential for energy-efficient molecular sieving-based separation. However, it remains challenging to implement COFs as an alternative membrane material due to the lack of a scalable and cost-effective fabrication mechanism. This work depicts a new method for fabricating a scalable in situ COF hollow fiber (HF) membrane by an interfacial polymerization (IP) approach at room temperature. The 2D COF film was constructed on a polyacrylonitrile HF substrate using aldehyde (1,3,5-trimethylphloroglucinol, Tp) and amine (4,4 `-azodianiline (Azo) and 4,4 `,4 `'-(1,3,5-triazine- 2,4,6-triyl) trianiline (Tta)) as precursors. The COF membrane on the PAN substrate showed 99% rejection of Direct red-80 with remarkable solvent permeance. The rejection analysis revealed that the structural aspects of the solute molecule play a major role in rejection rather than the molecular weight. We further optimized the precursor concentrations to improve the permeation performance of the resulting membrane. The durability study reveals excellent stability of the membrane toward organic solvents. This study also demonstrated the easy scalability of the membrane fabrication approach. The approach was further extrapolated to fabricate a cation-based COF membrane. These charged membranes exhibited an enhanced rejection performance. Finally, this approach can facilitate industrially challenging molecular sieving applications using COF-based membranes.</p>
10acovalent-organic framework10ahollow fiber10ainterfacial polymerization10aorganic solvent nanofiltration10aselective COF membrane1 aKunjattu, Shebeeb, H.1 aThorat, Nitin, M.1 aGawas, Saroj1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/scalable-interfacially-synthesized-covalent-organic-framework-cof-based-thin-film-composite