Salt-induced fabrication of superhydrophilic and underwater superoleophobic PAA-g-PVDF membranes for effective separation of oil-in-water emulsions

Wenbin Zhang, Yuzhang Zhu, Xia Liu, Dong Wang, Jingye Li, Lei Jiang, Jian Jin

Research output: Contribution to journalArticleResearchpeer-review

468 Citations (Scopus)

Abstract

Conventional polymer membranes suffer from low flux and serious fouling when used for treating emulsified oil/water mixtures. Reported herein is the fabrication of a novel superhydrophilic and underwater superoleophobic poly(acrylic acid)-grafted PVDF filtration membrane using a salt-induced phase-inversion approach. A hierarchical micro/nanoscale structure is constructed on the membrane surface and endows it with a superhydrophilic/ underwater superoleophobic property. The membrane separates both surfactant-free and surfactant-stabilized oil-in-water emulsions under either a small applied pressure (<0.3 bar) or gravity, with high separation efficiency and high flux, which is one to two orders of magnitude higher than those of commercial filtration membranes having a similar permeation property. The membrane exhibits an excellent antifouling property and is easily recycled for long-term use. The outstanding performance of the membrane and the efficient, energy and cost-effective preparation process highlight its potential for practical applications. Salting away: The title membranes having different PAA graft ratios were fabricated by using a salt-induced phase-inversion process. The membrane can separate both surfactant-free and surfactant-stabilized oil-in-water emulsions under either a small applied pressure (0.1 bar) or gravity, with a high separation efficiency and high flux. CA=contact angle.

Original languageEnglish
Pages (from-to)856-860
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number3
DOIs
Publication statusPublished - 13 Jan 2014
Externally publishedYes

Keywords

  • hydrophobic effect
  • membranes
  • oil-in-water emulsions
  • porous membranes
  • surface chemistry

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