Research on the separation and antifouling performance of DCMC/PEI coated modified PVDF ultrafiltration membrane
In order to reduce membrane contamination and improve membrane separation performance,a one-step deposition method was used to coat bis-formaldehyde carboxymethyl cellulose(DCMC)and polyethyleneimine(PEI)on the surface of polyvinylidene fluoride(PVDF)ultrafiltration membranes.Schiff base reactions occurred between the aldehyde groups on DCMC and the amino groups on PEI,forming a stable chemical crosslinking on the membrane surface.Compared to the pristine PVDF membrane,the DCMC/PEI-coated membrane exhibited enhanced hydrophilicity(water contact angle＜40°)and a reduced pore size(average pore size 20.32 nm).Humic acid(HA),bovine serum albumin(BSA),and sodium alginate(SA)were used as model pollutants from surface water for NOM rejection and antifouling experiments.The coated membrane provides over 93％rejection and flux recovery(FRR)of HA,BSA and SA,a 38％improvement over the original PVDF membrane.This cellulose-based coated membrane,which possesses both high separation and antifouling properties,offers a novel approach to mitigating membrane fouling.
万方数据
维普
