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The main purpose of this work is to improve the hydrophilicity and antifouling properties of hydrophobic polyvinylidene fluoride (PVDF) microfiltration membranes through modification. Pyrogallol (PG), polyethyleneimine (PEI), and (3-chloropropyl) trimethoxysilane (CTS) formed a stable hydrophilic network by Michael addition/Schiff reaction in alkaline solution Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the surface chemical composition, surface and cross-section morphology of the membrane. In addition, the properties of the membrane were tested systematically. The asprepared PVDF-PG/PEI/CTS membranes showed a smaller water contact angle down to 21.1± 4.8 . The pure water flux of the modified membrane increased significantly by about 18 folds, from 377.0 ± 61.0 to 6745.0 L m À2 h À1 , the separation efficiency for the four types of oil-in-water emulsions were all greater than 98.8%. In addition, the modified membrane showed high stability under various conditions of acidity, weak alkalinity and high salt content, showing great potential in the actual treatment of oily wastewater.

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