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- Publisher Website: 10.1016/j.cej.2022.138736
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Article: Superior selective adsorption of trace CO2 induced by chemical interaction and created ultra-micropores of ionic liquid composites
Title | Superior selective adsorption of trace CO2 induced by chemical interaction and created ultra-micropores of ionic liquid composites |
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Authors | |
Keywords | CO adsorption 2 Ionic liquids Selective capture Trace CO 2 Ultra-micropores |
Issue Date | 2023 |
Citation | Chemical Engineering Journal, 2023, v. 451, article no. 138736 How to Cite? |
Abstract | Effective capture of trace CO2 in atmosphere or confined spaces to ensure human beings safety draw a lot of attention, however, how to simultaneously improve CO2 capacity and selectivity still faces great challenge. Herein, combining porous molecular sieves (SBA-15 and MCM-41) and the anion-functionalized ionic liquid (IL) tetraethylammonium glycinate ([N2222][Gly]), a series of hierarchically porous IL composites with different IL loadings were designed and prepared. Compared with pristine supports, the incorporation of [N2222][Gly] simultaneously improves CO2 capacity and CO2/N2 selectivity by orders of magnitude, especially for confined spaces (<5000 ppm) and air (415 ppm). When the IL loading was 60 wt%, novel micropores were created, especially ultra-micropores (<0.65 nm), which are not present in bare supports and other [N2222][Gly]@SBA-15 (15, 30 and 45 wt%). Among them, 60 wt%[N2222][Gly]@SBA-15 showed the highest CO2 uptake of 1.45 and 1.88 mmolCO2/g-adsorbent at 0.0005 and 0.005 bar under 313 K along with recyclability, which are much superior to the state-of-the-art reported values. Moreover, superb ideal CO2/N2 selectivity of 11,545 at 0.005 bar and 288 K was achieved, which was 288 times that of SBA-15. Meanwhile, mixed gas breakthrough experiments demonstrated that 60 wt% [N2222][Gly]@SBA-15 shows outstanding CO2 separation performance under simulative confined spaces and ambient air. The ultra-high CO2 separation performance was attributed to the synergy of chemical interaction between the IL anion and CO2 as well as newly created micro- and ultra-micropores effect. This work provides guidelines for the design of IL composites with ultra-micropores for efficient trace CO2 removal. |
Persistent Identifier | http://hdl.handle.net/10722/327426 |
ISSN | 2023 Impact Factor: 13.3 2023 SCImago Journal Rankings: 2.852 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zheng, Shuang | - |
dc.contributor.author | Zeng, Shaojuan | - |
dc.contributor.author | Li, Guilin | - |
dc.contributor.author | Yao, Xiaoqian | - |
dc.contributor.author | Li, Zhengchen | - |
dc.contributor.author | Zhang, Xiangping | - |
dc.date.accessioned | 2023-03-31T05:31:15Z | - |
dc.date.available | 2023-03-31T05:31:15Z | - |
dc.date.issued | 2023 | - |
dc.identifier.citation | Chemical Engineering Journal, 2023, v. 451, article no. 138736 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.uri | http://hdl.handle.net/10722/327426 | - |
dc.description.abstract | Effective capture of trace CO2 in atmosphere or confined spaces to ensure human beings safety draw a lot of attention, however, how to simultaneously improve CO2 capacity and selectivity still faces great challenge. Herein, combining porous molecular sieves (SBA-15 and MCM-41) and the anion-functionalized ionic liquid (IL) tetraethylammonium glycinate ([N2222][Gly]), a series of hierarchically porous IL composites with different IL loadings were designed and prepared. Compared with pristine supports, the incorporation of [N2222][Gly] simultaneously improves CO2 capacity and CO2/N2 selectivity by orders of magnitude, especially for confined spaces (<5000 ppm) and air (415 ppm). When the IL loading was 60 wt%, novel micropores were created, especially ultra-micropores (<0.65 nm), which are not present in bare supports and other [N2222][Gly]@SBA-15 (15, 30 and 45 wt%). Among them, 60 wt%[N2222][Gly]@SBA-15 showed the highest CO2 uptake of 1.45 and 1.88 mmolCO2/g-adsorbent at 0.0005 and 0.005 bar under 313 K along with recyclability, which are much superior to the state-of-the-art reported values. Moreover, superb ideal CO2/N2 selectivity of 11,545 at 0.005 bar and 288 K was achieved, which was 288 times that of SBA-15. Meanwhile, mixed gas breakthrough experiments demonstrated that 60 wt% [N2222][Gly]@SBA-15 shows outstanding CO2 separation performance under simulative confined spaces and ambient air. The ultra-high CO2 separation performance was attributed to the synergy of chemical interaction between the IL anion and CO2 as well as newly created micro- and ultra-micropores effect. This work provides guidelines for the design of IL composites with ultra-micropores for efficient trace CO2 removal. | - |
dc.language | eng | - |
dc.relation.ispartof | Chemical Engineering Journal | - |
dc.subject | CO adsorption 2 | - |
dc.subject | Ionic liquids | - |
dc.subject | Selective capture | - |
dc.subject | Trace CO 2 | - |
dc.subject | Ultra-micropores | - |
dc.title | Superior selective adsorption of trace CO2 induced by chemical interaction and created ultra-micropores of ionic liquid composites | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cej.2022.138736 | - |
dc.identifier.scopus | eid_2-s2.0-85136619218 | - |
dc.identifier.volume | 451 | - |
dc.identifier.spage | article no. 138736 | - |
dc.identifier.epage | article no. 138736 | - |
dc.identifier.isi | WOS:000875112000002 | - |