A monolithic composite based on zeolite-like metal-organic framework@divinylbenzene polymer separates azeotropic fluorocarbon mixture efficiently.
Type
ArticleAuthors
Yusuf, Kareem
Shekhah, Osama

Aqel, Ahmad

Alharbi, Seetah
Alghamdi, Ali S
Aljohani, Reem M
Eddaoudi, Mohamed

ALOthman, Zeid A
KAUST Department
Functional Materials Design, Discovery and Development Research Group (FMD3), Advanced Membranes and Porous Materials Centre (AMPMC), Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), P.O. Box 6900, Jeddah 23955, Saudi Arabia.Advanced Membranes and Porous Materials Research Center
Physical Science and Engineering (PSE) Division
Chemical Science Program
Date
2023-03-15Embargo End Date
2025-03-15Permanent link to this record
http://hdl.handle.net/10754/690486
Metadata
Show full item recordAbstract
Organic monolithic columns are mainly used to separate macromolecules; however, many attempts to extend their performance toward small molecules were examined by incorporating micro- and nanoparticles. The incorporation technique enabled utilizing organic monoliths in gas chromatography (GC) for small molecules, which are still scarce. Here, we prepared a composite matrix of capillary monolithic columns of a zeolite-like metal-organic framework with a sodalite topology (sod-ZMOF) and Divinylbenzene polymer (DVB) for GC separations under 0.5 MPa. Relatively short DVB monolithic columns (18 cm long × 0.25 mm i.d.) incorporated with a tiny amount of sod-ZMOF nanoparticles (0.7 and 1.17 wt%) with an average particle size of 225 nm were successfully fabricated and used to separate linear alkanes and polar probes mixtures with increasing resolution up to 3.7 and 5.1 times, respectively, compared to a blank DVB monolithic column. A high-performance separation of linear alkanes series mixture (methane to decane) was exhibited in less than 2 min. McReynolds constants revealed that sod-ZMOF provided the composite monolith with a nonpolar character yielding a negative average polarity value smaller than the standard squalene column. An Excellent retention time of pentane and octane day-to-day reproducibility was achieved during 16 days and over more than 500 runs with RSD% of 2.25% and 3.3% using a composite monolithic column with 5 mg mL−1 sod-ZMOF (5-ZMOF@DVB). In addition, a qualitative determination of the gas mixture content of three commercially available Lighter gas cartridges was performed via the 5-ZMOF@DVB column. Finally, successfully separating an azeotropic freon mixture of difluoromethane (R-32) and pentafluoroethane (R-125) was achieved with a selectivity of up to 4.84. A further thermodynamic study related the preferential adsorption of R-125 to entropic factors rather than enthalpic while trapping inside ZMOF pores. This work sheds light on utilizing the infinite diversity of MOFs and combining their properties with high permeability and easily fabricated organic monoliths for GC separations of light molecules and gasses. Furthermore, the study highlights the role of GC as an easy and fast approach for the preliminary evaluation of the separation efficiency of porous polymers.Citation
Yusuf, K., Shekhah, O., Aqel, A., Alharbi, S., Alghamdi, A. S., Aljohani, R. M., Eddaoudi, M., & ALOthman, Z. A. (2023). A monolithic composite based on zeolite-like metal-organic framework@divinylbenzene polymer separates azeotropic fluorocarbon mixture efficiently. Journal of Chromatography A, 1694, 463922. https://doi.org/10.1016/j.chroma.2023.463922Sponsors
This work was supported through the project funded by the National Plan of Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, Grant Number 14-ADV2447–02.Publisher
Elsevier BVJournal
Journal of chromatography. APubMed ID
36931139Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S0021967323001486ae974a485f413a2113503eed53cd6c53
10.1016/j.chroma.2023.463922
Scopus Count
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