Capsules of Reactive Ionic Liquids for Selective Capture of Carbon Dioxide at Low Concentrations
| Autor: | Yun-Yang Lee, Katelynn J. Edgehouse, Hongchao Mao, Burcu Gurkan, Aidan Klemm, Emily Pentzer |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Ionic liquid Carbon dioxide Carbon dioxide scrubber General Materials Science 0210 nano-technology Volume concentration Pyrrole Polyurea |
| Zdroj: | ACS Appl Mater Interfaces |
| Popis: | 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 CO(2) (0-5,000 ppm) from moist air. Up to 60 wt% of IL was achieved in the synthesized capsules and we demonstrated comparable gravimetric CO(2) capacities to zeolites and enhanced absorption rates compared to 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 which are the conventional absorber materials for CO(2) 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 CO(2) from air, outperforming zeolites owing to their higher selectivity. It is shown that thermal stability, CO(2) absorption capacity, and rate of uptake by IL capsules can be further modulated by incorporating low-viscosity and non-reactive ILs to the capsule core. This study demonstrates an alternative and facile approach for CO(2) scrubbing where separation from gas mixtures with extremely low partial pressures of CO(2) is required. |
| Databáze: | OpenAIRE |
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