Preparation of mussel-inspired biomineralization superhydrophilic surface membrane for oil-water separation
Frequent marine crude oil spills and disorderly discharge of industrial oily wastewater have given rise to an urgent demand for efficient oil-water separation materials.Superhydrophilic membranes constructed by integrating membrane separation technology and surface engineering strategies have attracted great attention for achieving efficient oil-water separation.Herein,a mussel inspired mineralization strategy combined with mussel-inspired rapid deposition and layer-by-layer self-assembled mineralization is used to successfully prepare interface-stable superhydrophilic/underwater superoleophobic coatings with excellent self-cleaning properties on various membrane surfaces.Thanks to its outstanding superhydrophilicity and underwater oil repellency,the coated membrane is capable of efficiently separating oil-water mixtures as well as surfactant-stabilized oil-in-water emulsions.In addition,due to the excellent interfacial stability,the superhydrophilic membrane achieves long-term oil-in-water emulsion separation,with the separation efficiency of the coated membrane remaining above 99.2％during 30 times of emulsion separation.These superior properties combined with its facile fabrication process make it an ideal material for oil-water separation.
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