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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
Published on: February 13, 2016
Superior Hydrogen Separation in Nanofluidic Membranes by Synergistic Effect of Pore Tailoring and Host-Guest
Huijie Wang1, Miaomiao Shi1, Chong Wang1
1State Key Laboratory of Microbial Technology, Jiangsu Basic Research Center for Synthetic Biology, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
Abstract:
High-purity H2 production accompanied by precise decarbonization paves the way for a carbon-neutral society. Hydrogen-bonded organic frameworks (HOFs) are promising materials for advanced gas separation membranes, but their broad nanoscale pores limit selective separation. High-quality carboxylic acid-based HOF membranes (HOF-S, HOF-M, HOF-L) with pore sizes of 6.2, 16, and 24 Å were synthesized using an innovative pore-tailoring strategy. Under optimized conditions, H2 can pass through while CO2 is blocked by the size-exclusion principle. Abundant carboxylic acid groups in pores hinder the mobility of CO2 via electrostatic interaction, integrating adsorption and molecular sieving to enable excellent H2 transport and separation. The HOF-S membrane combines size exclusion and HOF-CO2 interactions, exhibiting excellent selectivity for H2/CO2 (164) and a ternary gas mixture (H2/CO2 selectivity: 154; H2/CH4 selectivity: 201). It also displays long-term stability under both dry and wet conditions. This strategy opens new possibilities for customizing nanofluidic membranes for advanced gas separation technologies.
