Egg Shell Powders-Coated Membrane for Surfactant-Stabilized Crude Oil-in-Water Emulsions Efficient Separation

Abstract

Low-cost, environmentally friendly superwetting materials are urgently desired in industrial oily wastewater situations. In our work, egg shell powders (ESP)-coated polyvinylidene fluoride (PVDF) membranes were fabricated by vacuum pumping ESP and sodium alginate suspensions onto a PDVF membrane. The ESP-coated PVDF membrane exhibited superamphilicity in air and showed superior underwater superoleophobicity with the contact angle above 156°. This membrane can efficiently separate low viscosity oil-in-water emulsions, which exhibit a high separation efficiency of more than 99.6%. What’s more, it also successfully separated high viscosity crude oil-in-water emulsions. In addition, the ESP-coated PVDF membrane still demonstrated an efficient separation efficiency after 10 times. Hence, we believe that this environmentally friendly material combined with a simple and economical method will be a better choice for the Tween-80-stabilized crude oil-in-water emulsions separation.

Fabrication of stable super‐hydrophilic/underwater super‐oleophobic poly(arylene ether nitrile) nanofibrous composite membranes via the one‐step co‐deposition of dopamine and 3‐aminopropyltriethoxysilane for efficient oil‐in‐water emulsion separation

“…Therefore, before oil came into contact with the membrane surface, a secure water/solid composite interface was formed. 50,51 Theoretically, once the CA of oil droplets was >90 o , the oil droplets could be effectively intercepted by the membrane (ΔP>0). The intrusion pressure ΔP can be expressed by Eqn (5) 52 :…”

Fabrication of polypropylene/lignin blend sponges via thermally induced phase separation for the removal of oil from contaminated water

“…Oil is a part of the natural environment for many decades and is a naturally occurring substance with the rapid development of oil production, transportation, exploration, and storage [1][2][3][4]. The risk of oil spillage increased with the potential to create a notable environmental problem and also a great waste of energy [5][6][7][8]. Therefore, many methods have adopted to clean and recycle spilled oil.…”

Impact of organosilanes modified superhydrophobic‐superoleophilic kaolin ceramic membrane on efficiency of oil recovery from produced water

“…Bai et al 25 fabricated a facile superhydrophobic wood slice via a simple vacuum impregnation and subsequent modification process that can be used to recover oil from water-in-oil emulsions with 98.0% separation efficiency. Zhang et al 26 reported egg shell powderscoated membrane for crude oil-in-water emulsions separation.…”