Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 210, Issue -, Pages 891-899Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.05.032
Keywords
Electro-responsive; Carbon membranes; Controllable wettability; Oil/water separation
Categories
Funding
- National Natural Science Foundation of China [21437001]
- Programme of Introducing Talents of Discipline to Universities [B13012]
- Programme for Chang Jiang Scholars and Innovative Research Team in University [IRT_13R05]
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Membrane filtration has shown great potential for the separation of oil-water mixtures. The separation of oil water mixtures is essentially an interfacial issue, and thus controllable surface wettability of membrane is extremely significant for efficient and cost-effective oil/water separation. Herein, poly-3-methylthiophene (P(3-MTH))/carbon membranes (CMs-P) with switchable surface wettability between superhydrophobicity and superhydrophilicity were designed. The CMs-P, prepared from coating P(3-MTH) on the highly porous and electrically conductive carbon nanofiber membranes, could exhibit the wettability switch by doping or dedoping the P(3-MTH) with ClO4- under electro-stimuli. The switch can be quickly achieved in less than 30 s and shows desired recyclability. Driven by gravity only, the prepared CMs-P are capable of completely separating free oil water mixture. Furthermore, the separation efficiency reaches to 99.5% for surfactant-stabled emulsions with various oil-water ratios. This work presents new insights into the study for smart gating membranes and the design of novel functional oil/water separation devices.
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