In this study,the Janus nanofibrous membrane with Polyacrylonitrile(PAN)/Polyvinylpyrrolidone(PVP)as shell and PVP/cellulose nanocrystal(CNC)as core was prepared by electrospinning.Then,the green water etching method was used to obtain a nanofibrous membrane with a porous channel structure.The results showed that the porous channel structure enlarged the water storage space inside the nanofiber,provided additional water permeation paths for the nanofibrous membrane,and gave the nanofibrous membrane excellent hydrophilicity and underwater super-oleophobicity,which increased the porosity from 54%to 83%,the underwater oil contact angle from 134° to 164°,and the water flux from 731 L/(m2·h)to 3 344 L/(m2·h).The permeation flux of the nanofibrous membrane to the n-hexane-in-water emulsion was as high as 1 985 L/(m2·h),and the TOC content in the filtrate was less than 50 mg/L.The membrane with a porous channel structure showed excellent oil/water separation performance.The porous channel structure design provides a green concept for the development and manufacture of oil/water separation membranes.
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