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Korean Journal of Chemical Engineering, Vol.36, No.1, 92-100, 2019
Hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation
This work presents an effective method of fabricating hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation. In this strategy, the superhydrophilic/underwater superoleophobic surfaces are fabricated by in-situ growing hierarchical Al2O3 nanosheets on the SiO2 fiber surfaces that can be used as water-removing materials for oil/water separation. Then, the superhydrophobic/oleophilic surfaces are obtained by surface chemical modification with sodium laurate, which can be used as oil-removing materials for oil/water separation. Interestingly, the reversible wettability transformation of Al2O3/SiO2 fiber membrane can be controlled by the annealing and modification treatment alternately. The as-prepared Al2O3/SiO2 fiber membrane, combining the advantages and overcoming disadvantages of two modes, achieves reversible wettability transitions and on-demand oil/water separation. In addition, the Al2O3/SiO2 fiber membrane shows a significant chemical stability and super-wettability even after five annealing and surface modification cycles, indicating its excellent durability. The separation efficiency in both oil-removing mode and water-removing mode is over 95% for various oil/water mixtures through multiple recycle separation processes. This work not only provides a simple and cost-effective method to fabricate separation membrane with reversible wettability, but also shows great potential in remediation of large-scale oil spillage or organic solvents discharge at different environmental conditions.
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[Cited By]
- Goel V, Mandal UK, Korean Journal of Chemical Engineering, 36(4), 573, 2019
- Eum KY, Phiri I, Kim JW, Choi WS, Ko JM, Jung HS, Korean Journal of Chemical Engineering, 36(8), 1313, 2019
- Raji YO, Othman MHD, Othman NAHSM, Adam MR, Tai ZS, Usman J, Ismail AF, Korean Journal of Chemical Engineering, 37(10), 1631, 2020
- Raji YO, Othman MHD, Othman NAHSM, Adam MR, Tai ZS, Usman J, Ismail AF, Korean Journal of Chemical Engineering, 37(10), 1631, 2020
- Sun Y, Zhao R, Wang Q, Zheng Y, Li G, Sun D, Wu T, Li Y, Korean Journal of Chemical Engineering, 37(11), 2054, 2020
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