In this study, oily waste water was treated by PVDF grafted with
PVP ultrafiltration membranes. The grafting process consisted of
defluorination, double bond hydration and PVP grafting. The modified
membranes were characterized by FTIR, BET, and contact
angles. Modification mechanism was discussed and it showed that
the hydroxyl and ketone group were generated during modification.
The results showed that PVP was grafted onto PVDF membrane
surface and the average pore sizes increased slightly while
pore structure was not nearly changed after modification.When the PVDF–PVP membranes were used to treat oily waste
water, their separation performance was improved greatly compared
with that of the PVDF membranes. Besides, fouling mechanism
was studied and it could be found that external fouling was
the main cause of flux decline. Moreover, flux recovery of the
fouled PVDF–PVP membranes after cleaned using 3 wt.% NaOH
aqueous solution exceeded 90% and was much superior to that of
the fouled PVDF membranes.
In this study, oily waste water was treated by PVDF grafted withPVP ultrafiltration membranes. The grafting process consisted ofdefluorination, double bond hydration and PVP grafting. The modifiedmembranes were characterized by FTIR, BET, and contactangles. Modification mechanism was discussed and it showed thatthe hydroxyl and ketone group were generated during modification.The results showed that PVP was grafted onto PVDF membranesurface and the average pore sizes increased slightly whilepore structure was not nearly changed after modification.When the PVDF–PVP membranes were used to treat oily wastewater, their separation performance was improved greatly comparedwith that of the PVDF membranes. Besides, fouling mechanismwas studied and it could be found that external fouling wasthe main cause of flux decline. Moreover, flux recovery of thefouled PVDF–PVP membranes after cleaned using 3 wt.% NaOHaqueous solution exceeded 90% and was much superior to that ofthe fouled PVDF membranes.
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