An oil-contamination-resistantPVP/PANelectrospinning membrane for high-efficient oil-water mixture and emulsion separation

Oil-water separation is an urgent issue due to the frequently occurred oil leakages and increasing discharge of oily wastewater. The pollutional and wastewater can not only damage the environment, but endanger human health. Owing to the small particle size of the oil contamination, it is still a challenge for the separation of oil-water emulsion. In this study, we developed a facile strategy to prepare a hydrophilic polyvinylpyrrolidone/polyacrylonitrile (PVP/PAN) nanofibrous membrane for oil-water mixture and emulsion separation. The lowest water contact angle on the membrane surface can achieve 16.7 degrees, thus the membranes can effectively resist the oil contamination on them. Moreover, the membrane can efficiently separate oil-water mixtures and emulsion by gravity. In addition, it can separate oil-water mixtures in harsh conditions (pH = 1 and 14). Membranes prepared in this work would hold a great potential in the practical use of water treatment and environmental industry.