▎ 摘　　要

A straightforward three-stage method was applied to fabricate a super-hydrophobic mixed-matrix nanofiber membrane using the electrospinning method for desalination purpose. First, a hydrothermal technique was applied to synthesize a super-hydrophobic nano-sheet, called octadecylamine-reduced graphene oxide (ODArGO) with a water contact angle of 162 degrees, which was then added to PVDF-HFP dope solution. After, 0.005 wt% LiCl was added to the dope solution to decrease the mean pore size by increasing solution conductivity. Moreover, some membranes were hot-pressed to improve liquid entry pressure (LEP). Eventually, a top-quality nanofiber membrane was synthesized using 0.1 wt% ODA-rGO and 0.005 wt% LiCl, and hot-pressed, named by MLH-0.1. By applying these stepwise improvements, the mean pore size reduced from 1.30 to 0.24 mu m and LEP significantly increased from 30.4 to 127.6 kPa, compared to a neat electrospun nanofiber membrane. Finally, MLH-0.1 was tested in the air gap membrane distillation process for desalination of an aqueous solution containing 3.5 wt% NaCl. MLH-0.1 demonstrated the maximum flux of 21.1 kg/m(2).h at temperatures of 70 degrees C and 20 degrees C for the feed and the permeation sides, respectively, as well as a remarkable and stable salt rejection of 99.99% for 4 days.