Journal
LANGMUIR
Volume 35, Issue 50, Pages 16545-16554Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.9b02661
Keywords
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Funding
- National Natural Science Fund of China [B060306, 51573135]
- Tianjin Science and Technology Military and Civilian Integration key special project [18ZXJMTG00110]
- Tianjin Municipal Science and Technology Project [16YEZCSF00120, 16JCYBJC17100]
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Covalent organic frameworks (COFs) have attracted broad interest in a number of fields including gas access, catalysis, and ionic adsorption. However, owing to the low stability in water, the application of COFs in the field of oil/water separation is extensively impeded. In this paper, we synthesized COF-DhaTab/polyacrylonitrile (PAN) nanofibrous composite membranes with a bioinspired spindle-knotted structure via a facile blending electrospinning method. The COF-DhaTab/PAN composite membrane shows prewetting-induced supero-leophobicity under water and super-hydrophobicity under oil. It possesses outstanding rejection ratio (>99.9%), excellent antifouling performance, and ultra- high oil/water mixture flux up to 4229.29 L/m(2) h even though driven only by gravity. Specifically, an extraordinary oil contact angle under water (152.3 degrees) and a satisfied water contact angle under oil (153.7 degrees) were offered by the composite membrane. These are mainly attributed to the spindle-knotted structures induced by COFs. To the best of our knowledge, the application of COF/PAN composite membrane in the field of oil/water separation has never been reported. It is an innovative approach for oily wastewater treatment and oil purification.
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