Abstract
The micro-/nanohierarchical super-wetting filter materials with low energy consumption, low-cost and high-efficiency have attracted tremendous attention. Moreover, traditional emulsion separation materials based on micro-/nanohierarchical structure are easy to be irreversibly damaged due to poor mechanical properties. In this work, a copper-based superhydrophobic microfiltration membrane was fabricated based on simple spraying process and short time self-assemble surface modification method. Only driven by gravity, the membranes maintained excellent water-in-oil emulsion separation performance with the efficiency higher than 99.975%, even after 10 separation cycles, the efficiency is still higher than 99.95%. After 50 sandpaper abrasion cycles, the membranes still displayed excellent separation efficiency through a simple re-modification process. The superhydrophobic microfiltration membranes also had the ability to resist acid and alkali. Robust and copper-based superhydrophobic microfiltration membranes with reversible repair property provide new ideas for the selection of stable emulsion separation materials, and have more advantages and potentials in practical applications.
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