| Oil-water mixture is widely used in petrochemical,semiconductor processing and other fields,causing serious pollution to the environment.In addition,the presence of moisture in refined oil can cause damage to equipment during use.The treatment of oil-water mixture by membrane separation technology has always been a research hotspot in the field of separation,especially in the field of separation membrane materials.Because of its excellent chemical stability,corrosion resistance,mechanical strength and separation efficiency,polytetrafluoroethylene(PTFE)flat membrane is a potential oil and water separation material.However,the strong hydrophobic property of PTFE membrane not only makes it easy to be polluted in the process of using but also limits its wide application in some industrial fields.Therefore,in order to improve the anti-pollution ability of PTFE membrane,it is very important to modify it by hydrophilic modification.Based on the field emission scanning electron microscope(SEM),X-ray photoelectron spectroscopy,contact Angle tester,Fourier infrared spectrometer and ultraviolet visible light spectrophotometer testing instruments,such as adhesive,studied the use of dopamine in the original film deposition after operation,simple further functionalization modification of PTFE flat membrane surface microstructure,aperture size and hydrophilic modification time and functional modification on the properties of oil-water separation.This paper was synthesized by the method of RAFT polymerization a ester containing sulfur generation unit and tertiary amine unit of the copolymer P(DMAEMA-co-TlaAm)as precursors of polymer modification,and then under the environment of weak base put sedimentary layer polydopamine PTFE membrane in glucosamine and P(DMAEMA-co-TlaAm)in mixed solution of glucosamine and sulfur lactone ammonia unlock ring reaction at the same time,releasing the hydrophobic base,then Michael addition reaction with polydopamine,successfully introduced contain hydrophilic groups glucosamine and antimicrobial resistance of tertiary amine groups.The FT-IR,SEM and XPS of the original film and chemical composition and surface morphology of the modified layer analysis,dynamic contact Angle and water flux examines the membrane hydrophilic and hydrophobic properties before and after modification and the change of permeability,the static protein adsorption and dynamic test of membrane pollution resistance,pollution by burning hydrocarbon heterogeneous Isopar M preparation of oil-water emulsion to inspect the oil/water separation properties of membrane.Escherichia coli and Staphylococcus aureus were used to test the antibacterial properties of the original and modified membranes.The results showed that the hydrophilicity of the membrane surface was enhanced by introducing glucosamine and dimethylaminoethyl methacrylate.The water flux of the original PTFE membrane soaked by ethanol for 30 minutes at 0.02MPa was 897 L·m-2·h-1·Bar-l,and the pure water flux of the modified film reached 3671 L·m-2·h-1·Bar-l.At the same time,the anti-pollution performance of the membrane was significantly enhanced before and after modification,and the adsorption of bovine serum albumin was reduced from 600?g·cm-2to 100?g·cm-2.In the cross-flow filtration of emulsified oil,the flux recovery rate is up to 90%and the retention rate of emulsified oil is up to 97%.The antibacterial rate of staphylococcus aureus is 99%,which has good antibacterial property. |
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