Dopamine Triggered the Polymerization and Co-Deposition of Hema on Pvdf Membranes to Prepare Oil-Water Separation Membranes

A one-step co-deposition method based on dopamine and hydrophilic monomer (HEMA) was proposed for the modification of polyvinylidene fluoride (PVDF) membrane to ameliorate its oil-water separation performances and hydrophilicity. The amount of HEMA added in the reaction solution had been changed to prepare a range of modified membranes, for the improved membrane, the minimum water contact angle can reach 14 °, and the maximum underwater oil contact angle can reach about 150 °, additionally,the pure water flux for the improved membrane researches 9668 L·m-2·h-1·bar-1, which shows the excellent hydrophilicity. In addition, the separation efficiency of the improved membrane for a variety of oil-water emulsions exceeds 98%, and has good permeability and circulating oil resistance. At the same time, this approach is also applicable to other membranes on account of the extensive availability of dopamine