Performance Study Of Self-cleaning Membrane With Anti Fouling Function

In this paper,based on different methods of antifouling modification of polymer matrix membranes,to explore the photocatalytic antifouling and super hydrophilic antifouling properties of the membranes given by the introduction of different modified inorganic oxides into polymer matrix membranes,and to study the anti adhesion and oil-water separation capabilities of the modified membranes for organic pollutants.The ZnO-650℃/PVDF composite membrane with vertical finger like pores and loose sponge like structure was prepared by non solvent induced phase separation method by mixing ZnO-650℃into the casting solution of poly（m-phenylenediamine）（PMIA）.The membrane has excellent antibacterial and catalytic properties.ZnO-650℃uses tetrasulfonatomethyl-n-hexyl calix resorcinarene tetrasodium salt（THCRT）as a template to adjust the shape and size of zinc oxide,and then anneals and calcines to prepare a special dumbbell shaped nano material,which increases the surface area of zinc oxide and improves the catalytic efficiency.The modified membrane has the advantages of good hydrophilicity,antibacterial property and degradation of organic pollutants.Compared with the original membrane,the modified membrane has higher hydrophilicity,contact angle of 60.9°,pure water flux of 795Lm^-2h^-1bar^-1,BSA retention rate of 97.04%,and photolysis efficiency of 94%due to the excellent micro nano structure of annealed zinc oxide.Its antibacterial effect on Escherichia coli is as follows:ZnO-650℃/PMIA>ZnO-0℃/PMIA>PMIA.Super hydrophilic membrane is an excellent choice for oil-water separation.Because of its super hydrophilicity,a water layer is formed on the membrane surface,which can prevent the adhesion of organic matters.Because of this,we realized the method of cross-linking aminated silica on the surface of polyamide（PA）membrane with glutaraldehyde,which endows the modified membrane with super hydrophilicity and antibacterial activity.Due to the unique pore structure of silica on the membrane surface and the super hydrophilic ability of the loaded amino group,its surface contact angle is 2.9°,the pure water flux is936Lm^-2h^-1bar^-1,and the efficiency of separating various oil-water lotion is more than 98%.In order to test the membrane tolerance,the effect of membrane separation oil-water lotion in 20cycles was also tested,and the results are more than 98%.In addition,due to the antibacterial properties of NH₂-SiO₂and glutaraldehyde on the membrane surface,the modified membrane has excellent antibacterial properties.The antibacterial circle of the modified membrane is4mm.Therefore,in the foreseeable future,NH₂-SiO₂/PA nano hybrid membrane has great potential as a new generation of anti pollution high-throughput membrane for oil spill wastewater treatment.These two kinds of antifouling membranes modified in different directions have important inspiration in the research of antifouling modification of membranes,and have good application prospects in the treatment of oil spill wastewater.