Bio-mimetic oxygen separation via a hollow fiber membrane contactor with O carrier solutions.

A low-cost poly(ethyleneimine)-cobalt (PEI-Co) complex solution with high O2 absorption capacity (as high as 1.5 L O2 (STP)/L solution) was developed and used in a bio-mimetic system to produce high-purity O2 from air. An oxygen concentration greater than 99.