Surface modification of polyethersulfone ultrafiltration membranes by corona air plasma for separation of oil/water emulsions

► Corona air plasma was used to modify the surface of PES ultrafiltration membranes. ► Effect of solvent on performance and surface structure of PES membrane was studied. ► Effect of treatment time and power of corona discharge was investigated. ► Corona treatment led to improve surface hydrophilicity and anti-fouling properties. ► A large increase in flux was observed without significant changes in oil rejection.