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Torkzadeh M, Moosavi M. Multiscale modeling of CO2 capture in dicationic ionic liquids: Evaluating the influence of hydroxyl groups using DFT-IR, COSMO-RS, and MD simulation methods. J Chem Phys 2024; 160:154502. [PMID: 38625081 DOI: 10.1063/5.0195668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 03/28/2024] [Indexed: 04/17/2024] Open
Abstract
This work employs a combination of density functional theory-infrared (IR), conductor-like screening model for real solvents (COSMO-RS), and molecular dynamic (MD) methods to investigate the impact of hydroxyl functional groups on CO2 capture within dicationic ionic liquids (DILs). The COSMO-RS reveals that hydroxyl groups in DILs reduce the macroscopic solubility of CO2 but improve the selectivity of CO2 over CO, H2, and CH4 gases. Quantum methods in the gas phase and MD simulations in the liquid phase were conducted to delve deeper into the underlying mechanisms. The IR spectrum analysis confirms red shifts in CO2's asymmetric stretching mode and blue shifts in the CR-HR bond of the dication, indicating CO2-DIL interactions and the weakening of the anion-cation interactions caused by the presence of CO2. The results show that the positioning of anions around hydroxyl groups and HR atoms in rings inhibits the proximity of CO2 molecules, causing the hydrogen atoms within methylene groups to accumulate CO2. van der Waals forces were found to dominate the interaction between ions and CO2. The addition of hydroxyl groups strengthens the electrostatic interactions and hydrogen bonds between dications and anions. The stronger interaction energy between ions in [C5(mim)2-(C2)2(OH)2][NTf2]2 limits the displacement of CO2 molecules within this DIL compared to [C5(mim)2-(C4)2][NTf2]2. Compared to [C5(mim)2-(C4)2][NTf2]2, [C5(mim)2-(C2)2(OH)2][NTf2]2 exhibits stronger ion-ion interactions, higher density, and reduced free volume, resulting in a reduction in CO2 capture. These results provide significant insights into the intermolecular interactions and vibrational properties of CO2 in DIL complexes, emphasizing their significance in developing efficient and sustainable strategies for CO2 capture.
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Affiliation(s)
- Mehrangiz Torkzadeh
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Majid Moosavi
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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Rivera-Pousa A, Lois-Cuns R, Otero-Lema M, Montes-Campos H, Méndez-Morales T, Varela LM. Size Matters: A Computational Study of Hydrogen Absorption in Ionic Liquids. J Chem Inf Model 2024; 64:164-177. [PMID: 38126302 PMCID: PMC10777413 DOI: 10.1021/acs.jcim.3c01688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/25/2023] [Accepted: 11/27/2023] [Indexed: 12/23/2023]
Abstract
We combined both density functional theory and classical molecular dynamics simulations to investigate the molecular mechanisms governing hydrogen solvation in a total of 12 ionic liquids. Overall, the analysis of the structural properties under high temperature and pressure conditions revealed weak interactions between hydrogen and the ionic liquids, with a slight preference of this gas to be placed at the apolar domains. Interestingly, those ionic liquids comprising nitrate anions allow the accommodation of hydrogen molecules also in the polar areas. The study of the hydrogen velocity autocorrelation functions supports this observation. In addition, the structure of all of the tested ionic liquids was almost insensitive to the addition of hydrogen, so the available free volume and cavity formation are presumably the most important factors affecting solubility.
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Affiliation(s)
- Alejandro Rivera-Pousa
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
| | - Raúl Lois-Cuns
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
| | - Martín Otero-Lema
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
| | - Hadrián Montes-Campos
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
- CIQUP,
Institute of Molecular Sciences (IMS)—Departamento de Química
e Bioquímica, Faculdade de Ciências
da Universidade do Porto, Rua Campo Alegre, Porto 4169-007, Portugal
| | - Trinidad Méndez-Morales
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
| | - Luis Miguel Varela
- Grupo
de Nanomateriais, Fotónica e Materia Branda, Departamento de
Física de Partículas, Universidade
de Santiago de Compostela, Campus Vida s/n, Santiago
de Compostela E-15782, Spain
- Instituto
de Materiais (iMATUS), Universidade de Santiago
de Compostela, Avenida
do Mestre Mateo 25, Santiago de Compostela E-15782, Spain
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Hei B, Pemberton JE, Schwartz SD. Classical Molecular Dynamics Simulation of Glyonic Liquids: Structural Insights and Relation to Conductive Properties. J Phys Chem B 2023; 127:921-931. [PMID: 36652632 PMCID: PMC9898233 DOI: 10.1021/acs.jpcb.2c07264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Rhamnolipids are biosurfactants that have obtained wide industrial and environmental interests with their biodegradability and great surface activity. Besides their important roles as surfactants, they are found to function as a new type of glycolipid-based protic ionic liquids (ILs)─glyonic liquids (GLs). GLs are reported to have impressive physicochemical properties, especially superionic conductivity, and it was reported in experiments that specific ion selections and the fraction of water content have a strong effect on the conductivity. Also, the shape of the conductivity curve as a function of water fraction in GLs is interesting with a sharp increase first and a long plateau. We related the conductivities to the three-dimensional (3D) networks composed of -OH inside the GLs utilizing classical molecular dynamics (MD) simulations. The amount and size of these networks vary with both ion species and water fractions. Before reaching the first hydration layer, the -OH networks with higher projection/box length ratios indicate better conductivity; after reaching the first hydration layer and forming continuous structures, the conductivity retains with more water molecules participating in the continuous networks. Therefore, networks are found to be a qualitative predictor of actual conductivity. This is explained by the analysis of the atomic structures, including radial distribution function, fraction free volume, anion conformations, and hydrogen bond occupancies, of GLs and their water mixtures under different chemical conditions.
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Affiliation(s)
- Bai Hei
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Jeanne E Pemberton
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Steven D Schwartz
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
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Torkzadeh M, Moosavi M. CO 2 capture using dicationic ionic liquids (DILs): Molecular dynamics and DFT-IR studies on the role of cations. J Chem Phys 2023; 158:024503. [PMID: 36641394 DOI: 10.1063/5.0131507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Dicationic ionic liquids (DILs) have been shown to be useful as an effective solvent for the absorption of CO2. However, compared to monocationic ionic liquids (MILs), they have been less investigated for this application. Previous studies on MIL-CO2 systems have shown that anions play the main role in tuning CO2 capture, but the partial negative charge on the oxygens of CO2 may interact with cation centers and, especially, for DILs with two charge centers, the role of cations can be significant. Therefore, the current work focuses on how cation symmetry and the length of side chains affect interactions and also the dynamical and structural properties of DIL-CO2 systems using molecular dynamics simulation. In addition, the effect of CO2 on the infrared vibrational spectra of isolated ions and ion triplet (DIL molecules) was studied using density functional theory calculations and the observed red and blue shifts have been interpreted. The results indicated that symmetric cation with longer side chains tend to interact more strongly with CO2 molecules. It seems that increasing the length of the side chains causes more bending of the middle chain, and in addition to increasing the free fraction volume, it weakens the interaction between cations and anions, and as a result more interaction between gas and cation. The results of this work may contribute to the rational molecular design of DILs for CO2 capture, DIL-based gas sensors, etc.
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Affiliation(s)
- Mehrangiz Torkzadeh
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Majid Moosavi
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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Maginn EJ. Virtual Issue on Carbon Dioxide: Physical Chemistry That Impacts Its Capture, Sequestration, and Conversion. J Phys Chem B 2022; 126:9927-9929. [PMID: 36475713 DOI: 10.1021/acs.jpcb.2c07562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Edward J Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556 United States
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Torkzadeh M, Moosavi M. DFT and COSMO-RS studies on dicationic ionic liquids (DILs) as potential candidates for CO 2 capture: the effects of alkyl side chain length and symmetry in cations. RSC Adv 2022; 12:35418-35435. [DOI: 10.1039/d2ra05805g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 11/25/2022] [Indexed: 12/13/2022] Open
Abstract
The weaker interaction energy between anions and cations, the stronger interaction of a CO2 molecule with the cation. Also, the selectivity of CO2 from H2, CO and CH4 gases decreases slightly with increasing the length of side alkyl chains.
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Affiliation(s)
- Mehrangiz Torkzadeh
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Majid Moosavi
- Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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