Nanofiber based oil-water separation and purification material having a shifted inclined-hole structure and preparation method thereof

A nanofiber based oil-water separation and purification material having a shifted inclined-hole structure, wherein the material is a multi-layer composite fiber membrane, each layer of the fiber membrane has a plurality of uniformly distributed inclined frustum cone-shaped through holes, and a large end of each of the frustum cone-shaped through holes is upward, and a small end of each of the frustum cone-shaped through holes is downward;

• large ends of any two adjacent inclined frustum cone-shaped through holes in each layer of the fiber membrane are tangent to each other;
• each frustum cone in shape through hole in each layer of the fiber membrane has one corresponding frustum cone-shaped through hole in an under layer of the fiber membrane;
• and the small end of the each frustum cone-shaped through hole in each layer of fiber membrane communicates with the large end of the one corresponding inclined frustum cone-shaped through hole in the under layer of the fiber membrane;
• all of the inclined frustum cone-shaped through holes have an identical size, an identical inclination direction and an identical inclination angle;
• a percentage of a sum of areas of large ends of all of the inclined frustum cone-shaped through holes in each layer of the fiber membrane to a unilateral surface area of the each layer of the fiber membrane is 80 to 90%;
• and
• each layer of the fiber membrane is made of oleophylic hydrophobic nanofibers.