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Regulating the Layered Stacking of a Covalent Triazine Framework Membrane for Aromatic/Aliphatic Separation |
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| Authors: | Cuijing Liu Junjun Hou Mingzheng Yan Prof. Jianqi Zhang Haftu Gebrekiros Alemayehu Wei Zheng Pengchao Liu Prof. Zhiyong Tang Prof. Lianshan Li |
| Affiliation: | 1. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China School of Metallurgical Engineering, Xi'an University of Architecture and Technology, 710055 Xi'an, P. R. China These authors contributed equally to this work. Contribution: Data curation (lead), Investigation (equal), Methodology (lead), Writing - original draft (equal);2. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China University of Chinese Academy of Sciences, 100049 Beijing, P. R. China These authors contributed equally to this work. Contribution: Data curation (equal), Investigation (supporting), Methodology (supporting);3. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China University of Chinese Academy of Sciences, 100049 Beijing, P. R. China Contribution: Data curation (supporting);4. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China Contribution: Investigation (supporting);5. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China University of Chinese Academy of Sciences, 100049 Beijing, P. R. China Contribution: Funding acquisition (equal);6. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, P. R. China |
| Abstract: | Membrane separation of aromatics and aliphatics is a crucial requirement in chemical and petroleum industries. However, this task presents a significant challenge due to the lack of membrane materials that can endure harsh solvents, exhibit molecular specificity, and facilitate easy processing. Herein, we present a novel approach to fabricate a covalent triazine framework (CTF) membrane by employing a mix-monomer strategy. By incorporating a spatial monomer alongside a planar monomer, we were able to subtly modulate both the pore aperture and membrane affinity, enabling preferential permeation of aromatics over aliphatics with molecular weight below 200 Dalton (Da). Consequently, we achieved successful all-liquid phase separation of aromatic/aliphatic mixtures. Our investigation revealed that the synergistic effects of size sieving and the affinity between the permeating molecules and the membrane played a pivotal role in separating these closely resembling species. Furthermore, the membrane exhibited remarkable robustness under practical operating conditions, including prolonged operation time, various feed compositions, different applied pressure, and multiple feed components. This versatile strategy offers a feasible approach to fabricate membranes with molecule selectivity toward aromatic/aliphatic mixtures, taking a significant step forward in addressing the grand challenge of separating small organic molecules through membrane technology. |
| Keywords: | aromatic/aliphatic mixture membrane separation covalent triazine framework porous membrane stacking space |