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

By Haijun Zhang, Yongqian Shen, Mouji Li, Guorong Zhu, Hua Feng, Jian Li. ACS Sustainable Chemistry and Engineering, 2019

152 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering, Surfaces, Coatings and Films, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/bf60c9c106026f9fa7b4d268b31708f2a2f1d71f