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Qi K, Yu J, Gao Y, Shi L, Yi Q, Li X, Zeng J, Gao L, Gao L. Ultrathin and Self-Supporting MOF/COF-Based Composite Membranes for Hydrogen Separation and Purification from Coke Oven Gas. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:12755-12766. [PMID: 38848303 DOI: 10.1021/acs.langmuir.4c01368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2024]
Abstract
Coke oven gas (COG) is considered to be one of the most likely raw materials for large-scale H2 production in the near or medium term, with membrane separation technologies standing out from traditional technologies due to their less energy-intensive structures as well as simple operation and occupation. Based on the "MOF-in/on-COF" pore modification strategy, the COF membrane (named the PBD membrane) and ZIF-67 were used as assembly elements to design advanced molecular sieving membranes for hydrogen separation. The composition and microstructure of membranes before and after ZIF-67 loading as well as ZIF-67-in-PBD membranes under different preparation conditions (metal ion concentration, metal-ligand ratio, and reaction time) were investigated by various characterizations to reveal the synthesis regularity and microstructure regulation. Furthermore, H2/CH4 separation performances and separation mechanisms were also analyzed and compared. Finally, a dense, continuous, ultrathin, and self-supporting ZIF-67-in-PBD membrane with a Co2+ concentration of 0.02 mol/L, a metal-ligand ratio of 1:4, and a reaction time of 6 h exhibited the largest specific surface area, micropore proportion, and the best H2/CH4 separation selectivity (α = 33.48), which was significantly higher than the Robeson upper limit and was in a leading position among reported MOF membranes. The separation mechanism was mainly size screening, and adsorption selectivity also contributed a little.
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Affiliation(s)
- Kai Qi
- Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
- Shanxi Institute of Eco-environmental Planning and Technology, Taiyuan 030003, Shanxi, China
- Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
| | - Junmei Yu
- Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
| | - Yifei Gao
- Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
| | - Lijuan Shi
- School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074, China
| | - Qun Yi
- School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074, China
| | - Xuelian Li
- Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
- Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
| | - Jian Zeng
- Shanxi Institute of Eco-environmental Planning and Technology, Taiyuan 030003, Shanxi, China
| | - Longsheng Gao
- Shanxi Institute of Eco-environmental Planning and Technology, Taiyuan 030003, Shanxi, China
| | - Lili Gao
- Department of Environmental Science & Technology, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
- Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, Shanxi, China
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Ren Z, Kelly J, Gunathilaka CP, Brinzer T, Dutta S, Johnson CA, Mitra S, Garrett-Roe S. Ultrafast dynamics of ionic liquids in colloidal dispersion. Phys Chem Chem Phys 2017; 19:32526-32535. [PMID: 29188825 DOI: 10.1039/c7cp04441k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ionic liquid (IL)-surfactant complexes have significance both in applications and fundamental research, but their underlying dynamics are not well understood. We apply polarization-controlled two-dimensional infrared spectroscopy (2D-IR) to study the dynamics of [BMIM][SCN]/surfactant/solvent model systems. We examine the effect of the choice of surfactants and solvent, and the IL-to-surfactant ratio (W-value), with a detailed analysis of the orientation and structural dynamics of each system. Different surfactants create very different environments for the entrapped ILs, ranging from a semi-static micro-environment to a fluxional environment that evolves even faster than the bulk IL. The oil-phase also clearly affects the microscopic dynamics. The anisotropy decay for entrapped ILs completes within 10 ps, which is similar to free thiocyanate ion in water, while a significant reorientation-induced spectral diffusion (RISD) effect is observed. The entrapped ionic liquid are highly dynamic for all W-values, and no core-shell structure is observed. We hypothesize that, instead of an ionic liquid-reverse micelle (IL-RM), the microscopic structure of this system is small colloidal dispersions or pairs of IL and surfactants. A detailed analysis of the polarization-controlled 2D-IR spectra of AOT system reveals a potential ion-exchange mechanism.
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Affiliation(s)
- Zhe Ren
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, USA.
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Cheng H, Zhang J, Qi Z. Effects of interaction with sulphur compounds and free volume in imidazolium-based ionic liquid on desulphurisation: a molecular dynamics study. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1337273] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hongye Cheng
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Jinwei Zhang
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhiwen Qi
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
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