Oily wastewater from industries adversely impacts the environment, human, and aquatic life. Poly(vinylidene fluoride) (PVDF) membrane modified with a zwitterionic/hydrophobic pentapolymer (PP) with controlled pore size has been utilized to separate oil from water from their nano-emulsions. The PZP has been synthesized in 91% yield via pentapolymerization of four different diallylamine salts (CH2=CHCH2)2NH+(CH2)x A- having x and A- as: 3, CO2- (I); 1, PO3H2; Cl- (II); 3, SO3- (III), (CH2=CHCH2)2NH+(CH2)12NH3+Cl- (iv), and SO2  in a respective mol ratio of 25:36:25:14:100. Incorporating PZP into PVDF has shown a substantially reduced membrane hydrophobicity; the contact angle decreased from 92.5o to 47.4o. The PP-PVDF membranes have demonstrated an excellent capability to deal with high concentrations of nano-emulsions with a separation efficiency greater than 97.5%. The Flux Recovery Ratio (FRR) of PP incorporated PVDF membrane was about 82%, substantially higher than the pristine PVDF.

Oily wastewater from industries adversely impacts the environment, human, and aquatic life. Poly(vinylidene fluoride) (PVDF) membrane modified with a zwitterionic/hydrophobic pentapolymer (PP) with controlled pore size has been utilized to separate oil from water from their nano-emulsions. The PZP has been synthesized in 91% yield via pentapolymerization of four different diallylamine salts (CH~2~=CHCH~2~)~2~NH^+^(CH~2~)_~x~_ A^-^ having _x_ and A^-^ as: 3, CO~2~- (**I**); 1, PO~3~H~2~; Cl^-^ (**II**); 3, SO~3~^-^ (**III**), (CH~2~=CHCH~2~)~2~NH^+^(CH~2~)~12~NH~3~^+^Cl^-^ (**iv**), and SO~2~  in a respective mol ratio of 25:36:25:14:100. Incorporating PZP into PVDF has shown a substantially reduced membrane hydrophobicity; the contact angle decreased from 92.5^o^ to 47.4^o^. The PP-PVDF membranes have demonstrated an excellent capability to deal with high concentrations of nano-emulsions with a separation efficiency greater than 97.5%. The Flux Recovery Ratio (FRR) of PP incorporated PVDF membrane was about 82%, substantially higher than the pristine PVDF.

Synthesis of a zwitterionic polymer for fabrication of PVDF membranes in order to enhance their performance for efficient separation of oil-in-water nano-emulsions

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