Hierarchical Al2O3/SiO2 fiber membrane with reversible wettability for on-demand oil/water separation

다국어 초록 (Multilingual Abstract)

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.

참고문헌 (Reference)

1 D. Yuan, 327 : 539-, 2017

2 X. Yue, 57 : 10439-, 2018

3 S. Gao, 128 : 1-, 2017

4 X. Yue, 199 : 411-, 2018

5 X. Yue, 309 : 522-, 2017

6 T. Zhang, 309 : 7-, 2017

7 S. Liu, 290 : 220-, 2016

8 X. Yue, 328 : 117-, 2017

9 F. Zhang, 25 : 4192-, 2013

10 Z. Xue, 2 : 2445-, 2014

11 H. Liu, 6 : 25414-, 2016

12 Q. Wen, 4 : 591-, 2013

13 P. -C. Chen, 3 : 2776-, 2013

14 X. Yue, 25 : 5951-, 2018

15 H. Che, 54 : 8934-, 2015

16 X. Du, 313 : 398-, 2017

17 Y. Liu, 331 : 278-, 2018

18 J. Gu, 6 : 16204-, 2014

19 H. -C. Yang, 55 : 13398-, 2016

20 W. Ma, 537 : 128-, 2017

21 N. Wagner, 55 : 3436-, 2014

22 Y. Xiang, 97 : 86-, 2015

23 A. K. Kota, 3 : 1025-, 2012

24 C. Lu, 78 : 24-, 2018

25 C. -T. Liu, 4 : 13543-, 2016

26 Y. E. Miao, 4 : 5353-, 2012

27 Sunhee Jo, "Superhydrophilic-underwater superoleophobic TiO2-coated mesh for separation of oil from oily seawater/wastewater" 한국화학공학회 33 (33): 3203-3206, 2016

28 Xuejie Yue, "In situ fabrication dynamic carbon fabrics membrane with tunable wettability for selective oil–water separation" 한국공업화학회 61 : 188-196, 2018