Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture
This work presents new composites of AAILs@MCM-48 obtained by functionalizing ordered mesoporous silica MCM-48 with two amino acid-based ionic liquids (AAILs) ([Emim][Gly] and [Emim][Ala]) to improve carbon capture and the selectivity of CO<sub>2</sub> over nitrogen. Thermogravimetric an...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-03-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/14/6/514 |
| _version_ | 1797239770922876928 |
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| author | Firuz A. Philip Amr Henni |
| author_facet | Firuz A. Philip Amr Henni |
| author_sort | Firuz A. Philip |
| collection | DOAJ |
| description | This work presents new composites of AAILs@MCM-48 obtained by functionalizing ordered mesoporous silica MCM-48 with two amino acid-based ionic liquids (AAILs) ([Emim][Gly] and [Emim][Ala]) to improve carbon capture and the selectivity of CO<sub>2</sub> over nitrogen. Thermogravimetric and XRD analyses of the composites showed that the MCM-48 support’s thermal and structural integrity was preserved after the AAILs were encapsulated. An N<sub>2</sub> adsorption–desorption study at 77 K confirmed AAIL encapsulation in the porous support. Under post-combustion flue gas conditions, both [Emim][Gly]@MCM-48 and [Emim][Ala]@MCM-48 demonstrated improved CO<sub>2</sub> adsorption in comparison to the unmodified MCM-48, with a CO<sub>2</sub> partial pressure of around 0.15 bar. Regarding the maximal CO<sub>2</sub> uptake, the 40 wt.%-[Emim][Gly] composite outperformed the others at 303 K, with values of 0.74 and 0.82 mmol g<sup>−1</sup>, respectively, at 0.1 and 0.2 bar. These numbers show a 10× and 5× increase, respectively, compared to the pure MCM-48 under identical conditions. In addition, the selectivity of the composites was improved significantly at 0.1 bar: the selectivity of composites containing 40 wt.% [Emim][Ala] increased to 17, compared to 2 for pristine MCM-48. These composites outperform other silica-based studies reported in the literature, even those using amines as solvents. The presented composites offer therefore promising prospects for advancing carbon capture technology. |
| first_indexed | 2024-04-24T17:56:49Z |
| format | Article |
| id | doaj.art-0aba1a15457541bdac1dc0b9dd91dbf4 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-04-24T17:56:49Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-0aba1a15457541bdac1dc0b9dd91dbf42024-03-27T13:57:34ZengMDPI AGNanomaterials2079-49912024-03-0114651410.3390/nano14060514Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon CaptureFiruz A. Philip0Amr Henni1Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 0A2, CanadaFaculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 0A2, CanadaThis work presents new composites of AAILs@MCM-48 obtained by functionalizing ordered mesoporous silica MCM-48 with two amino acid-based ionic liquids (AAILs) ([Emim][Gly] and [Emim][Ala]) to improve carbon capture and the selectivity of CO<sub>2</sub> over nitrogen. Thermogravimetric and XRD analyses of the composites showed that the MCM-48 support’s thermal and structural integrity was preserved after the AAILs were encapsulated. An N<sub>2</sub> adsorption–desorption study at 77 K confirmed AAIL encapsulation in the porous support. Under post-combustion flue gas conditions, both [Emim][Gly]@MCM-48 and [Emim][Ala]@MCM-48 demonstrated improved CO<sub>2</sub> adsorption in comparison to the unmodified MCM-48, with a CO<sub>2</sub> partial pressure of around 0.15 bar. Regarding the maximal CO<sub>2</sub> uptake, the 40 wt.%-[Emim][Gly] composite outperformed the others at 303 K, with values of 0.74 and 0.82 mmol g<sup>−1</sup>, respectively, at 0.1 and 0.2 bar. These numbers show a 10× and 5× increase, respectively, compared to the pure MCM-48 under identical conditions. In addition, the selectivity of the composites was improved significantly at 0.1 bar: the selectivity of composites containing 40 wt.% [Emim][Ala] increased to 17, compared to 2 for pristine MCM-48. These composites outperform other silica-based studies reported in the literature, even those using amines as solvents. The presented composites offer therefore promising prospects for advancing carbon capture technology.https://www.mdpi.com/2079-4991/14/6/514CO<sub>2</sub> capturemesoporous silicaMCM-48amino acid ionic liquidtask-specific ionic liquid |
| spellingShingle | Firuz A. Philip Amr Henni Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture Nanomaterials CO<sub>2</sub> capture mesoporous silica MCM-48 amino acid ionic liquid task-specific ionic liquid |
| title | Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture |
| title_full | Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture |
| title_fullStr | Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture |
| title_full_unstemmed | Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture |
| title_short | Functionalization of Ordered Mesoporous Silica (MCM-48) with Task-Specific Ionic Liquid for Enhanced Carbon Capture |
| title_sort | functionalization of ordered mesoporous silica mcm 48 with task specific ionic liquid for enhanced carbon capture |
| topic | CO<sub>2</sub> capture mesoporous silica MCM-48 amino acid ionic liquid task-specific ionic liquid |
| url | https://www.mdpi.com/2079-4991/14/6/514 |
| work_keys_str_mv | AT firuzaphilip functionalizationoforderedmesoporoussilicamcm48withtaskspecificionicliquidforenhancedcarboncapture AT amrhenni functionalizationoforderedmesoporoussilicamcm48withtaskspecificionicliquidforenhancedcarboncapture |