Electrospun nanofiber membrane and method for preparing electrospun nanofiber membrane

A method for preparing an electrospun nanofiber membrane, comprising:

• adding polyvinyl alcohol in a mixed solution of trifluoroacetic acid and dichloromethane with a volume ratio of the trifluoroacetic acid and the dichloromethane being 7:3 to obtain a mixture;
• heating the mixture in water bath with 80 degrees Celsius (° C.) and magnetically stirring the mixture to fully dissolve the polyvinyl alcohol in the mixed solution to obtain a dissolved mixture;
• adding poly(l-lactic acid) and regenerated silk fibroin in the dissolved mixture to obtain a second mixture after cooling down the water bath to 55° C. and obtaining a spinning solution by magnetically stirring the second mixture in the water bath with 55° C.;
• wherein a total mass fraction of the regenerated silk fibroin, the polyvinyl alcohol and the poly(l-lactic acid) in the spinning solution is 15 percent weight per volume (% w/v);
• and
• wherein a mass ratio of the regenerated silk fibroin:the polyvinyl alcohol:the poly(l-lactic acid) is 75:20:5;
• introducing the spinning solution into a syringe of an electrospinning device under conditions of a positive voltage being 40 kilo volts (kV), a negative voltage being −5 kV and an injection distance being 18 centimeters (cm) to prepare the electrospun nanofiber membrane.