Design and fabrication of functionalized porous organic polymers (POPs) for the application in CO2 adsorption and separation has attracted much attention from the scientific community. Physisorption based CO2 capture using solid-state POPs stands out as a potential alternative to liquid- or solvent-based capture techniques, due to their excellent chemical and thermal stability, tunable porosity and the ability to impart CO2-philic functionalities for increasing the CO2 capture performance. Nitrogen-rich covalent triazine frameworks (CTFs), a subclass of POPs, are promising candidates for CO2 capture. Our group has reported the synthesis of a series of tailor-made extensively fluorinated CTFs derived materials, displaying high surface areas, extensive ultra-micropores and exceptional CO2 adsorption capacities. The CO2-philic properties of powdered fluorinated triazine frameworks make them promising candidates for fabrication of porous CO2 separation membranes. This is rarely reported due to lack of suitable synthetic approaches. Based on the previous works of our group, fluorinated membranes based on CTFs are prepared through a rational design of aromatic nitrile monomers containing fluorine and ether groups via a sol-gel polymerization process. The CO2 separation performance rises significantly with the fluorine content in the membrane. With functionalized triazine units, fluorine and ether groups, these carbon molecular sieve membranes obtained after pyrolysis exhibit intrinsic ultra-micropores, high surface areas and excellent thermal stability under air. Excellent CO2 permeability and CO2/N2 selectivity surpassing the Robeson upper bound are achieved. Our general design and synthesis protocol allow an easy access to fluorinated porous membranes, thus significantly expanding the currently limited library of CO2-philic and chemically stable membranes for highly efficient CO2 separation.

Fluorinated porous organic materials: Design and application in CO2 adsorption and separation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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