Underwater superoleophobic membrane with hydrophobic bump and hydrophilic sublayer structure for effective oil-in-water emulsions separation

Underwater superoleophobic membranes are competitive strategy for accomplishing efficient oil-in-water emulsions separation. However, permeating flux of water probably may be dropped with the reduction of pore size. Moreover, the plenty of oil phase may block pore canal resulting the decrease of separation performance. Herein, an underwater superoleophobic membrane with hydrophobic bump and hydrophilic sublayer structure was fabricated through spinning hexadecyltrimethoxysilane (HDTMS) modified SiO2 (H-SiO2) microparticles on polydopamine (PDA) hydrophilized polyvinylidene fluoride (PVDF, PDP) membrane. Therefore, the sieving of hydrophilic PDP membrane sublayer and oil absorption-flotation of hydrophobic H-SiO2 bump are ongoing simultaneously in separation processes, thus effective decreasing oil fouling to break the trade-off effect between separation efficiency and permeation flux. Interestingly, the PDPS membrane not only could efficiently separate diverse emulsions involving low and high-viscosity oil/water emulsions, but also possessed excellent mechanical (200 times of bending test) and chemical (separation of oil-in-corrosive waster emulsions) stabilities.

Automated summary

Underwater superoleophobic membranes are a competitive strategy for efficient oil-in-water emulsion separation. The reduction of pore size may decrease the permeating flux of water, while the presence of a large amount of oil phase may block the pore canal, resulting in decreased separation performance. A hydrophobic/hydrophilic structured membrane was fabricated using hexadecyltrimethoxysilane (HDTMS) modified SiO2 (H-SiO2) microparticles on a polydopamine (PDA) hydrophilized polyvinylidene fluoride (PVDF, PDP) membrane. This membrane effectively decreases oil fouling and breaks the trade-off effect between separation efficiency and permeation flux.