Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 16, Pages 19184-19193Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01622
Keywords
Pickering emulsion template encapsulation; core-shell microparticles; polyurea-ionic liquid; IL capsules; imidazolium; pyrrole; CO2 scrubber; separation of CO2
Funding
- NSF CAREER Award [1551943]
- NASA Early Career Faculty Award [80NSSC18K1505]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1551943] Funding Source: National Science Foundation
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The task-specific ionic liquid (IL), 1-ethyl-3-methylimidazolium 2-cyanopyrolide ([EMIM][2-CNpyr]), was encapsulated with polyurea (PU) and graphene oxide (GO) sheets via a one-pot Pickering emulsion, and these capsules were used to scrub CO2 (0-5000 ppm) from moist air. Up to 60 wt % of IL was achieved in the synthesized capsules, and we demonstrated comparable gravimetric CO2 capacities to zeolites and enhanced absorption rates compared to those of bulk IL due to the increased gas/liquid surface-to-volume area. The reactive IL capsules show recyclability upon mild temperature increase compared to zeolites that are the conventional absorber materials for CO2 scrubbing. The measured breakthrough curves in a fixed bed under 100% relative humidity establish the utility of reactive IL capsules as moisture-stable scrubber materials to separate CO2 from air, outperforming zeolites owing to their higher selectivity. It is shown that thermal stability, CO2 absorption capacity, and rate of uptake by IL capsules can be further modulated by incorporating low-viscosity and nonreactive ILs to the capsule core. This study demonstrates an alternative and facile approach for CO2 scrubbing, where separation from gas mixtures with extremely low partial pressures of CO2 is required.
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