Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 3, Pages 856-860Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201308183
Keywords
hydrophobic effect; membranes; oil-in-water emulsions; porous membranes; surface chemistry
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Funding
- National Basic Research Program of China [2013CB933000]
- Key Development Project of Chinese Academy of Sciences [KJZD-EW-M01-3]
- Natural Science Foundation of Jiangsu Province [BK20130007]
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Conventional polymer membranes suffer from low flux and serious fouling when used for treating emulsified oil/water mixtures. Reported herein is the fabrication of a novel superhydrophilic and underwater superoleophobic poly(acrylic acid)-grafted PVDF filtration membrane using a salt-induced phase-inversion approach. A hierarchical micro/nanoscale structure is constructed on the membrane surface and endows it with a superhydrophilic/underwater superoleophobic property. The membrane separates both surfactant-free and surfactant-stabilized oil-in-water emulsions under either a small applied pressure (<0.3 bar) or gravity, with high separation efficiency and high flux, which is one to two orders of magnitude higher than those of commercial filtration membranes having a similar permeation property. The membrane exhibits an excellent antifouling property and is easily recycled for long-term use. The outstanding performance of the membrane and the efficient, energy and cost-effective preparation process highlight its potential for practical applications.
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