Ultra-thin enzymatic liquid membrane for CO2 separation and capture

Yaqin Fu, Ying-Bing Jiang (), Darren Dunphy, Haifeng Xiong, Eric Coker, Stanley S. Chou, Hongxia Zhang, Juan M. Vanegas, Jonas G. Croissant, Joseph L. Cecchi, Susan B. Rempe and C. Jeffrey Brinker ()
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Yaqin Fu: University of New Mexico
Ying-Bing Jiang: University of New Mexico
Darren Dunphy: University of New Mexico
Haifeng Xiong: University of New Mexico
Eric Coker: Sandia National Laboratories
Stanley S. Chou: Sandia National Laboratories
Hongxia Zhang: Angstrom Thin Film Technologies LLC
Juan M. Vanegas: Sandia National Laboratories
Jonas G. Croissant: University of New Mexico
Joseph L. Cecchi: University of New Mexico
Susan B. Rempe: Sandia National Laboratories
C. Jeffrey Brinker: University of New Mexico

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract The limited flux and selectivities of current carbon dioxide membranes and the high costs associated with conventional absorption-based CO2 sequestration call for alternative CO2 separation approaches. Here we describe an enzymatically active, ultra-thin, biomimetic membrane enabling CO2 capture and separation under ambient pressure and temperature conditions. The membrane comprises a ~18-nm-thick close-packed array of 8 nm diameter hydrophilic pores that stabilize water by capillary condensation and precisely accommodate the metalloenzyme carbonic anhydrase (CA). CA catalyzes the rapid interconversion of CO2 and water into carbonic acid. By minimizing diffusional constraints, stabilizing and concentrating CA within the nanopore array to a concentration 10× greater than achievable in solution, our enzymatic liquid membrane separates CO2 at room temperature and atmospheric pressure at a rate of 2600 GPU with CO2/N2 and CO2/H2 selectivities as high as 788 and 1500, respectively, the highest combined flux and selectivity yet reported for ambient condition operation.

Date: 2018
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DOI: 10.1038/s41467-018-03285-x

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