Composite filtering membrane for seawater desalination

Abstract

The composite filtering membrane comprises a polyamide nanofiber layer and composite layers located on the two sides of the polyamide nanofiber layer, and each composite layer comprises a polyurethane nanofiber layer, a carbon nanofiber layer and a non-woven fabric supporting layer which are sequentially arranged from inside to outside; the fiber diameter of the polyurethane nanofiber layer is larger than that of the polyamide nanofiber layer and smaller than that of the carbon nanofiber layer. By arranging a multi-layer nanofiber layer structure and gradually increasing the diameter of each layer of fiber from the center to the outside, the optimization of high-efficiency filtering performance is realized; in addition, the outer-layer nanofiber also has a good filtering effect, and the innermost-layer nanofiber meets the requirement of filtering precision, so that the problem that in a single-layer nanofiber structure, the fiber diameter is too small and is easy to damage due to the too high filtering precision requirement is solved, and the service life of the filtering membrane is prolonged.

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