Capsules of Reactive Ionic Liquids for Selective Capture of Carbon Dioxide at Low ConcentrationsClick to copy article linkArticle link copied!
- Yun-Yang LeeYun-Yang LeeDepartment of Chemical Engineering Biomolecular Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United StatesMore by Yun-Yang Lee
- Katelynn EdgehouseKatelynn EdgehouseDepartment of Chemistry, Department of Materials Science and Engineering, Texas A&M University, 3003 TAMU, College Station, Texas 77843, United StatesMore by Katelynn Edgehouse
- Aidan KlemmAidan KlemmDepartment of Chemical Engineering Biomolecular Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United StatesMore by Aidan Klemm
- Hongchao MaoHongchao MaoDepartment of Chemical Engineering Biomolecular Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United StatesMore by Hongchao Mao
- Emily PentzerEmily PentzerDepartment of Chemistry, Department of Materials Science and Engineering, Texas A&M University, 3003 TAMU, College Station, Texas 77843, United StatesMore by Emily Pentzer
- Burcu Gurkan*Burcu Gurkan*Email: [email protected]Department of Chemical Engineering Biomolecular Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United StatesMore by Burcu Gurkan
Abstract

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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