Shape‐Selective Ultramicroporous Carbon Membranes for Sub‐0.1 nm Organic Liquid Separation

Advanced Science

Hyeokjun Seo¹  Banseok Oh¹  Dong‐Yeun Koh¹  Yongchul G. Chung²  Sunghyun Yoon² 

[1] Department of Chemical and Biomolecular Engineering (BK‐21 Plus) Korea Advanced Institute of Science and Technology Daejeon 34141 South Korea;School of Chemical Engineering Pusan National University Busan 46241 South Korea;

关键词: nanoporous carbon;    organic solvent forward osmosis (OSFO);    pore rigidity;    shape selectivity;    solvent‐solvent separation;   

DOI  :  10.1002/advs.202004999

来源: DOAJ

【 摘 要 】

Abstract Liquid‐phase chemical separations from complex mixtures of hydrocarbon molecules into singular components are large‐scale and energy‐intensive processes. Membranes with molecular specificity that efficiently separate molecules of similar size and shape can avoid phase changes, thereby reducing the energy intensity of the process. Here, forward osmosis molecular differentiation of hexane isomers through a combination of size‐ and shape‐based separation of molecules is demonstrated. An ultramicroporous carbon membrane produced with 6FDA‐polyimides realized the separation of isomers for different shapes of di‐branched, mono‐branched, and linear molecules. The draw solvents provide the driving force for fractionation of hexane isomers with a sub‐0.1 nm size difference at room temperature without liquid‐phase pressurization. Such membranes could perform bulk chemical separations of organic liquids to achieve major reductions in the energy intensity of the separation processes.

【 授权许可】

Unknown