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A scalable method toward superhydrophilic and underwater superoleophobic PVDF membranes for effective oil/water emulsion separation
writer:Tao Yuan, Jian-qiang Meng*, Ting-yu Hao, Zi-hong Wang, Yu-feng Zhang
keywords:oil/water separation, underwater superoleophobic, superhydrophilic
Issue time:2015年
 A superhydrophilic and underwater superoleophobic PVDF membrane (PVDFAH) has been prepared by surface-coating of a hydrogel onto the membrane surface, and its superior performance for oil/water emulsion separation has been demonstrated. The coated hydrogel was constructed by an interfacial polymerization based on the thiol-epoxy reaction  of pentaerythritol tetrakis  (3-mercaptopropionate) (PETMP) with diethylene glycol diglycidyl ether (PEGDGE) and simultaneously tethered on an alkaline-treated commercial PVDF membrane  surface  via  the  thio-ene  reaction.  The  PVDFAH membranes can be fabricated in a few minutes under mild conditions and show superhydrophihc and underwater superoleophobic properties for a series of organic solvents. Energy dispersive X-ray (EDX) analysis shows that the hydrogel coating was efficient throughout the pore  lumen.  The  membrane  shows  superior  oil/water  emulsion separation performance, including high water permeation, quantitative oil rejection, and robust antifouling performance in a series oil/water emulsions, including that prepared from crude oil. In addition, a 24 h Soxhlet-extraction experiment with ethanol/water solution (50:50, v/v) was conducted to test the tethered hydrogel stability. We see that the membrane maintained the water contact angle below 50, indicating the covalent tethering stability. This technique shows great promise for scalable fabrication of membrane materials for handling practical oil emulsion purification.