Ultra-thin enzymatic liquid membrane for CO separation and capture.

Authors:
Yaqin Fu
Yaqin Fu
Zhejiang Sci-Tech University
China
Darren Dunphy
Darren Dunphy
University of New Mexico
Mexico
Haifeng Xiong
Haifeng Xiong
University of New Mexico
Eric Coker
Eric Coker
University of Kentucky
United States
Stanley S Chou
Stanley S Chou
Northwestern University
United States
HongXia Zhang
HongXia Zhang
Second Military Medical University
China
Juan M Vanegas
Juan M Vanegas
College of Biological Sciences

Nat Commun 2018 03 7;9(1):990. Epub 2018 Mar 7.

Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, NM, 87131, USA.

The limited flux and selectivities of current carbon dioxide membranes and the high costs associated with conventional absorption-based CO sequestration call for alternative CO separation approaches. Here we describe an enzymatically active, ultra-thin, biomimetic membrane enabling CO 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 CO 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 CO at room temperature and atmospheric pressure at a rate of 2600 GPU with CO/N and CO/H selectivities as high as 788 and 1500, respectively, the highest combined flux and selectivity yet reported for ambient condition operation.

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http://dx.doi.org/10.1038/s41467-018-03285-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5841395PMC

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March 2018
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