Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 601, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2020.117842
Keywords
Superhydrophobic; SiC; Ceramic membrane; ZnO; Oil-water separation
Categories
Funding
- National Natural Science Foundation of China of China [21490581]
- China Petroleum & Chemical Corporation [317008-6]
- Guangxi Innovation Driven Development Foundation
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Superhydrophobic-superoleophilic ceramic membranes with chemical, thermal and mechanical robustness are promising for efficient water-in-oil emulsion separation. Here, we report a facile approach to fabricate superhydmphobic-superoleophilic SiC membranes via ZnO nanosphere (NS) deposition and n-octyltriethoxysilane surface grafting. ZnO NSs were grown onto SiC grains by chemical solution deposition method to form micro-nano hierarchical structures for the membrane surfaces. By tuning the precursor concentration, the surface structures of SiC-25, SiC-50 and SiC-75 membranes (C(Zn2+) = 25, 50 and 75 mM) were tailored with the increasing density of ZnO NSs. We found that the surfaces of SiC-50 and SiC-75 membrane were superhydrophobic-superoleophilic. Compared with pristine and simply grafted SiC membranes, the three SiC membranes with ZnO NS and grafting modification displayed excellent water rejection (>99.0%) and superior oil flux. The SiC-50 membrane displayed the optimal performance with steady-state flux was up to similar to 1000 L m(-2) h(-1) under 1 bar for 500 ppm water-in-hexane emulsion. The effects of surface structure and wettability on water-inoil emulsion separation performance is revealed. We also confirmed the stability of the superhydrophobicity for the SiC-75 membrane. This work offers new insights into constructing robust superhydrophobic-supemleophilic ceramic membranes for high-performance water removal from oil products.
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