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Separation and Purification Technology

Separation and Purification Technology

IF: 8.09
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Fabrication of smart spherical three-dimensional covalent organic framework membranes with switchable oil–water separation via interfacial polymerization

Published:13 December 2024 DOI: 10.1016/j.seppur.2024.131074
Yang Liu, Xiaoyu Du, Yanqing Qu, Hongge Jia, Shuangping Xu, Mingyu Zhang

Abstract

The three-dimensional covalent organic framework (3D COF) materials exhibit low density and facile functional group modification, rendering them highly promising for applications in adsorption, separation, and catalysis. However, there is a paucity of research on switchable oil–water separation using 3D COF materials. In this study, we have successfully fabricated a multifunctional spherical 3D COF membranes through interfacial terpolymerization. The presence of abundant hydroxyl groups within the porous structure imports hydrophilicity, while the incorporation of numerous fluorine atoms enhances lipophilicity. Furthermore, the capillary action exhibited by the spherical architecture provides an excellent foundation for pre-wetting processes. As well, by theoretical calculation, the membrane is easy to transition from the Cassie state to the Wenzel state, which is conducive to the formation of oil–water amphiphobicity membranes. By leveraging these unique characteristics, our prepared membrane enables facile transition between hydrophilic and lipophilic states via pre-wetting techniques. Moreover, it demonstrates exceptional performance in selectively separating light oil–water mixtures, heavy oil–water mixtures, water-in-oil emulsions, and oil-in-water emulsions with separation efficiencies exceeding 98?% and separation fluxes surpassing 632 L·m-2h-1bar?1. Notably, our membrane exhibits remarkable solvent stability and cyclic stability as well. We anticipate that this straightforward approach will pave the way for developing 3D COF membranes as switchable materials for efficient oil–water separation.

Substances (10)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Dichloromethane 75-09-2 CH2Cl2 1377 suppliers $10.00-$8660.00
Sodium hydroxide 1310-73-2 NaOH 1358 suppliers $14.00-$17490.00
Acetonitrile 75-05-8 C2H3N 1115 suppliers $10.00-$61180.00
Tween 80 9005-65-6 C24H44O6 1055 suppliers $15.00-$2720.00
Ethanol 64-17-5 C2H6O 955 suppliers $10.00-$28350.00
Methanol 67-56-1 CH4O 895 suppliers $9.00-$7620.00
Hexane 110-54-3 C6H14 886 suppliers $20.00-$8100.00
p-Toluenesulfonic acid 104-15-4 C7H8O3S 877 suppliers $5.00-$550.00
Methylene Blue 61-73-4 C16H18ClN3S 460 suppliers $5.00-$3070.00
PETROLEUM ETHER 64742-89-8 35 suppliers $97.10-$6590.00

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