The removal of CO2 from combustion streams has become a global challenge with significant environmental implications. While a number of approaches have been explored to separate CO2 from mixed streams, membranes are a promising technology because of their small footprint, reliability and energy efficiency. Ionic liquid-based membranes provide a unique framework to tailor the solubility and diffusion of gas molecules by varying the cation/anion combination to improve gas interaction and transport. Hybrid, or mixed matrix, membranes combine the advantages of a porous material with the stability and reliability of a dense matrix to form an advanced membrane material with enhanced permeance and selectivity. Hollow carbon spheres with a microporous shell incorporated into a polymer matrix will be presented as a unique strategy to fabricate high performance membrane materials. The empty space within the hollow spheres promotes fast gas transport while the symmetry of the carbon shell along with the strong interaction between the carbon surface and a unique block co-polymer allows for the formation of a mechanically robust membrane with enhanced permeance and selectivity compared to the dense polymer. In addition, graphene- and graphene-oxide-based hybrid membranes provide a distinct opportunity to enhance membrane performance through unique architectures. Incorporating ionic liquids into graphene and graphene-oxide membranes can lead to novel gas transport mechanisms that improve permeance and selectivity leading to a new class of ultrathin, hybrid membranes.

Hybrid membranes for CO2 separation

2019 Spring National Meeting

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