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Three-Dimensionally Printed Bioinspired Superhydrophobic Packings for Oil-in-Water Emulsion Separation.

The separation of oil-water emulsions has attracted considerable attention in recent years. The main challenge is to find new cost-effective ways to develop new separation technology that has the potential for scaling up treatment. In this study, benefitting from the idea in traditional chemical engineering processes, we report on three-dimensionally (3D) printed superhydrophobic poly(lactic acid) (PLA) packings for oil-water emulsion separation. Superhydrophobicity was achieved through a bioinspired modification process including selective solvent etching and nanoparticle decoration. The obtained superhydrophobic PLA packings has an air-water contact angle (WCA) of 150° and a water adhesion force (WAF) of 22 μN. A maximum separation efficiency of 95% was achieved while retaining a relatively high flux of 7.5 kL m-2 h-1 by tailoring the internal geometry. Our approach demonstrates a promising method to fabricate packings with user-defined and functional features. The relatively low-cost and efficient fabrication process are beneficial in industrial applications.