Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 640, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119836
Keywords
Composite membrane; Underwater superoleophobicity; Crude oil-in-water emulsion separation; Stable flux
Categories
Funding
- National Natural Science Foundation of China [51872245]
- Fok Ying-Tong Education Foundation of China [161044]
- Natural Science Foundation for Distinguished Young Scholars of Gansu Province, China [18JR3RA083]
- Open Research Fund of the Key Laboratory of Marine Materials and Related Technologies [2019K03]
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials
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A composite polyvinyl alcohol-graphene oxide-titanium dioxide (PGT) membrane with rough structure was prepared through a simple hydrothermal and suction-filtration method, exhibiting outstanding underwater superoleophobicity even for high-adhesion crude oil. The membrane displayed efficient oil-in-water emulsions separation performance with high separation efficiency and permeation flux, as well as corrosion resistance and mechanical stability.
Most super-wetting membrane materials are susceptible to oil pollution after separation process, causing a serious degradation of the separation ability. The rough structure of underwater superoleophobic membrane can effectively improve anti-fouling property, thus achieving stable separation. Herein, a composite polyvinyl alcohol-graphene oxide-titanium dioxide (PVA-GO-TiO2, PGT) membrane with rough structure is prepared through a simple hydrothermal and suction-filtration method. The as-prepared PGT membrane displays outstanding underwater superoleophobicity even for high-adhesion crude oil. Moreover, the as-fabricated membrane exhibits efficient oil-in-water emulsions separation performance with separation efficiency of larger than 99.1% and permeation flux of over than 762 L m(-2) h(-1) even after 10 min. Besides, the PGT membrane could separate various oil-in-water emulsions in corrosive environments with separation efficiency of higher than 99.3% and permeation flux of more than 760 L m(-2) h(-1). More importantly, the as-prepared membrane could keep the underwater superoleophobicity after sanding test (200 times) and bending test (500 times). The composite membrane with excellent oil-in-water emulsions separation performance, corrosion resistance and mechanical stability has broad prospects in the field of water purification.
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