Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 571, Issue -, Pages 142-150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2019.03.079
Keywords
Layer-by-layer assembly; Water/oil separation; Dual emulsion separation; Superhydrophilicity/underwater superoleophobicity; Superoleophilicity/underoil superhydrophobicity
Categories
Funding
- National Natural Science Foundation of China [51335010, 51675252, 51805516]
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Separation of oily waste water and emulsified water/oil mixtures has gained much social attention due to the increasing emission of industrial waste water and sanitary sewage. However, endowing a material with the capacity of separating multiple immiscible water/oil mixtures and emulsified water-in-oil/oil-in-water mixtures is still challengeable but urgently desirable. Herein, a universal layer-by-layer assembly method utilizing the electrostatic attraction between polyethyleneimine (PEI) and SiO2 nanoparticles has been adopted in fabricating superwetting materials regardless of the substrates. The as-prepared materials which possess both superhydrophilicity/underwater superoleophobicity and superoleophilicity/underoil superhydrophobicity present high separation capability without any pre-wetting treatment towards various water/oil mixtures, including water/heavy oil mixtures, water/light oil mixtures, water-in-oil emulsions and oil-in-water emulsions. Significantly, the addition of (3-Glycidyloxypropyl) trimethoxysilane (KH-560) acting as a crosslinking agent with PEI endues as-prepared materials excellent durability and chemical stability in cyclic separations and extreme environments, respectively. Benefitting from the universality and substrate-independency of LbL-assembly, the method adopted in this paper could satisfy multiple demands of industry by applying on desirable substrates.
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