Abstract: The treatment of industrial oil leakage and oily wastewater has become an essential problem that must be tackled immediately, as human society have evolved and developed. With the benefits of high separation efficiency and ease of operation, the omentum separation method has become a new research focus. Click reaction and dehydration condensation reaction were used to graft 3-mercaptopropyl triethoxylsilane (KH-580) and cationic [2-(methylacryloxy) ethyl] trimethylammonium chloride (DMC) onto silica nanoparticles (SiO2), which then reacted with sodium perfluorooctanoate (PFOA-Na) with anion to prepare superhydrophilic air hydrophobic metal net, sprayed on stainless steel metal net. The contact angle measuring device, Fourier infrared spectrometer, scanning electron microscope, and other instruments were used to characterize it, and the influence of nano-silica quality on underwater contact angle was explored. The results demonstrated that quaternary amine cation was successfully grafted onto the surface of nano-silica, which then reacted with anion on sodium perfluorooctanoate. The superhydrophobic metal net's superhydrophilic contact angle with water in air was 0°, and the superhydrophobic metal net's contact angle with edible oil in air was 120°. 0.4 g was chosen as the appropriate nano-silica mass grade for numerous types of oil with underwater contact angles more than 150°, and the underwater contact angle and aperture were improved. Under the super-hydrophilic-air hydrophobic water, the separation efficiency of the five kinds of oil in the experiment is greater than 96.85%, and the maximum separation flux of the five kinds of oil is 23 192 L/(m2·h). The oil is chosen as the research item, and after 30 separation cycles, the separation efficiency is at least 95.65%. It is revealed that in superhydrophilic air and hydrophobic water, the superhydrophobic metal mesh is stable and practical.
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2022, Vol. 36 
