Preparation method of O-HNTs/ZIF-8 composite membrane with changeable wettability through pre-infiltration induction

The invention provides a preparation method of an O-HNTs/ZIF-8 composite membrane with changeable wettability through pre-infiltration induction, which comprises the following steps: depositing halloysite nanotubes (HNTs) subjected to oxidation pretreatment and a zeolite imidazate framework material (ZIF-8) with a specific particle size range on a PVDF (Polyvinylidene Fluoride) substrate membrane through an auxiliary vacuum filtration method; after the super-amphiphilic membrane is pre-wetted by water or oil, the wettability of the super-amphiphilic membrane can be adjusted from super-amphipathy in air to super-amphipathy under water or oil, the super-amphiphilic membrane can be converted into super-oleophobicity under water after being pre-wetted in water, and the super-amphiphilic membrane can be converted into super-hydrophobicity under oil after being pre-wetted in oil. The oil-water separator can be used for oil-water separation, and required components can be selectively obtained only by changing the re