FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids
Porous liquids, which are liquids with permanent porosity, have received significant attention as a new class of materials with the potential for far-reaching impacts in a variety of applications including gas separation. In this work, in situ Fourier transform infrared spectroscopy measurements wer...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2021-12-01
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| Series: | Green Chemical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666952821000674 |
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| author | Jennifer A. Schott Chi-Linh Do-Thanh Weida Shan Nicolette G. Puskar Sheng Dai Shannon M. Mahurin |
| author_facet | Jennifer A. Schott Chi-Linh Do-Thanh Weida Shan Nicolette G. Puskar Sheng Dai Shannon M. Mahurin |
| author_sort | Jennifer A. Schott |
| collection | DOAJ |
| description | Porous liquids, which are liquids with permanent porosity, have received significant attention as a new class of materials with the potential for far-reaching impacts in a variety of applications including gas separation. In this work, in situ Fourier transform infrared spectroscopy measurements were conducted to investigate the mechanism of carbon dioxide absorption in a porous ionic liquid consisting of ZIF-8 combined with 8,8′-(3,6-dioxaoctane-1,8-diyl)bis(1,8-diazabicyclo[5.4.0]undec-7-en-8-ium) bis(trifluoromethanesulfonyl)imide ([DBU-PEG][(Tf2N)2]). While the vibrational modes of the pure ionic liquid remain relatively unchanged, the incorporation of carbon dioxide leads to slight structural fluctuations in the ZIF-8 framework whether it is pure solid or as integrated into the porous ionic liquid. The analysis of the vibrational modes of the porous ionic liquid suggests that the interaction of the CO2 occurs more strongly with the ring structure of the ZIF-8 framework. The splitting of the asymmetric stretch of the CO2 into multiple peaks upon sorption indicate the presence of multiple environments, which could be a combination of free and physisorbed CO2 or simply multiple binding sites within the porous ionic liquid. A better understanding of gas sorption mechanisms in this unique material could lead to new porous ionic liquids with enhanced separations properties. |
| first_indexed | 2024-04-11T04:50:14Z |
| format | Article |
| id | doaj.art-ab09e427530b491aa2ec3517a5edfa1b |
| institution | Directory Open Access Journal |
| issn | 2666-9528 |
| language | English |
| last_indexed | 2024-04-11T04:50:14Z |
| publishDate | 2021-12-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Green Chemical Engineering |
| spelling | doaj.art-ab09e427530b491aa2ec3517a5edfa1b2022-12-27T04:40:02ZengKeAi Communications Co. Ltd.Green Chemical Engineering2666-95282021-12-0124392401FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquidsJennifer A. Schott0Chi-Linh Do-Thanh1Weida Shan2Nicolette G. Puskar3Sheng Dai4Shannon M. Mahurin5Department of Chemistry, Joint Institute for Advanced Materials, University of Tennessee, Knoxville, TN, 37996, USADepartment of Chemistry, Joint Institute for Advanced Materials, University of Tennessee, Knoxville, TN, 37996, USADepartment of Chemistry, Joint Institute for Advanced Materials, University of Tennessee, Knoxville, TN, 37996, USAChemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USADepartment of Chemistry, Joint Institute for Advanced Materials, University of Tennessee, Knoxville, TN, 37996, USA; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USAChemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA; Corresponding author.Porous liquids, which are liquids with permanent porosity, have received significant attention as a new class of materials with the potential for far-reaching impacts in a variety of applications including gas separation. In this work, in situ Fourier transform infrared spectroscopy measurements were conducted to investigate the mechanism of carbon dioxide absorption in a porous ionic liquid consisting of ZIF-8 combined with 8,8′-(3,6-dioxaoctane-1,8-diyl)bis(1,8-diazabicyclo[5.4.0]undec-7-en-8-ium) bis(trifluoromethanesulfonyl)imide ([DBU-PEG][(Tf2N)2]). While the vibrational modes of the pure ionic liquid remain relatively unchanged, the incorporation of carbon dioxide leads to slight structural fluctuations in the ZIF-8 framework whether it is pure solid or as integrated into the porous ionic liquid. The analysis of the vibrational modes of the porous ionic liquid suggests that the interaction of the CO2 occurs more strongly with the ring structure of the ZIF-8 framework. The splitting of the asymmetric stretch of the CO2 into multiple peaks upon sorption indicate the presence of multiple environments, which could be a combination of free and physisorbed CO2 or simply multiple binding sites within the porous ionic liquid. A better understanding of gas sorption mechanisms in this unique material could lead to new porous ionic liquids with enhanced separations properties.http://www.sciencedirect.com/science/article/pii/S2666952821000674Porous ionic liquidsCO2 separationInfrared spectroscopyGas-liquid interactions |
| spellingShingle | Jennifer A. Schott Chi-Linh Do-Thanh Weida Shan Nicolette G. Puskar Sheng Dai Shannon M. Mahurin FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids Green Chemical Engineering Porous ionic liquids CO2 separation Infrared spectroscopy Gas-liquid interactions |
| title | FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids |
| title_full | FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids |
| title_fullStr | FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids |
| title_full_unstemmed | FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids |
| title_short | FTIR investigation of the interfacial properties and mechanisms of CO2 sorption in porous ionic liquids |
| title_sort | ftir investigation of the interfacial properties and mechanisms of co2 sorption in porous ionic liquids |
| topic | Porous ionic liquids CO2 separation Infrared spectroscopy Gas-liquid interactions |
| url | http://www.sciencedirect.com/science/article/pii/S2666952821000674 |
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