Bioinspired porous organic polymers functionalized membranes for efficient CO2 capture
Carbonic anhydrase (CA) shows a strong affinity for CO2, therefore, it is widely used in the separation membrane for CO2 capture. Here, a novel biomimetic material (Co-BBP) was successfully synthesized, which can mimic the active site of CA and successfully loaded on the surface of porous organic polymers (POPs). Then, mixed matrix membranes (MMMs) were manufactured by droping Co-BBP@POP-1 nano-composites into Pebax matrix to improve CO2 separation performance. Compared with the MMMs doped with Co-BBP or POP-1, the prepared MMMs doped with Co-BBP@POP-1 showed exceptional CO2 separation performance owing to their synergistic effect. The MMMs containing 5 wt% of Co-BBP@POP-1 showed the optimum state with a CO2 permeability of 886 Barrer and a CO2/N2 selectivity of 94.2, which surpassing the Robeson bond (2008). Compared with the pristine Pebax membrane, the CO2 permeability and CO2/N2 selectivity of the MMMs were increased by 9.5 times and 3.03 times, respectively. In short, the combination of Co-BBP and POP-1 provide a good way for the application of biomimetic enzymes and may expand the synergistic effects strategy for preparing biomimetic membranes for CO2 capture.