The invention discloses a super-hydrophobic nano-
fiber composite membrane for
membrane distillation and a preparation method thereof. The nano-
fiber composite membrane has a double-layer structure andcomprises a base layer and a
surface layer which are compounded with each other, wherein the base layer is a nano-
fiber base film and the
surface layer is a porous super-hydrophobic separation layer.The preparation method comprises the following steps: preparing a base layer by adopting a
polymer solution electrostatic
spinning method, and then carrying out
hot pressing treatment; thermally dissolving a
polyolefin material in a
solvent and stirring them evenly, removing a
solvent-rich phase under an external force of a vacuum-assisted suction
filtration method, and depositing a
polymer-richphase on the surface of the base layer; and then, adding a volatile
polyolefin non-
solvent to construct a nano-fiber
composite membrane with a porous structure
skin layer on a
microscopic scale. The product membrane prepared by the method provided by the invention is efficient and durable, the preparation method is simple and feasible, the defects of high price, low
porosity, low
water vapor fluxand easy
wetting of membrane pores of a traditional
membrane distillation membrane can be obviously improved, and the large-scale modification of the existing
membrane distillation membrane can be easily realized.