An ultrathin in situ silicification layer developed by an electrostatic attraction force strategy for ultrahigh-performance oil–water emulsion separation
Membrane fouling caused by oil or other pollutants is one of the major challenges for membrane separation technology used for emulsified oil/water purification. Aiming at the realization of comprehensive fouling-resistant/fouling-release properties, and the further achievement of long-term cyclic se...
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Veröffentlicht in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (42), p.24569-24582 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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Zusammenfassung: | Membrane fouling caused by oil or other pollutants is one of the major challenges for membrane separation technology used for emulsified oil/water purification. Aiming at the realization of comprehensive fouling-resistant/fouling-release properties, and the further achievement of long-term cyclic separation, an ultrathin silica (SiO
2
) layer is conformally engineered onto a porous polyketone (PK) substrate
via
the electrostatic attraction force silicification process. This
in situ
silicification forms an ultrathin and superhydrophilic/underwater superoleophobic interface structure that allows the realization of ultrahigh water permeance up to 7533 L m
−1
h
−1
bar
−1
, an exceptionally high emulsion flux up to 6000 L m
−1
h
−1
bar
−1
(close to pure water permeance), and a high rejection of >99.9% against various oily emulsions. The unique design of the superhydrophilic silicification layer grown on the hydrophilic PK substrate also endowed the membrane with comprehensive antifouling properties against a broad range of oily emulsions containing various pollutants such as proteins, surfactants, and other natural organic materials (NOM), from which a nearly 100% recovery ratio of permeation flux could be obtained after several cycles of oily emulsion filtration. The use of an inorganic SiO
2
modified layer incorporated into a highly chemically inert PK substrate (SiO
2
-d-PK membrane) also enabled the application of the SiO
2
-d-PK membrane under more challenging conditions, where its great tolerance and long-term stability toward salty and strongly acidic/alkaline solutions and various organic solvents were further demonstrated. Overall, this study provides an insight into engineering an ultrathin membrane with ultralow fouling-propensity for treating challenging oily emulsions. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/C9TA07988B |