Preparation And Properties Of Graphene Oxide Modified And Polyethersulfone Mixed Matrix Membranes

With the rapid development of modern industry,a large amount of dye wastewater is discharged every year in our country,leading to serious ecological and environmental problems.The treatment of dye wastewater is using ultrafiltration membranes is a common method.However,membrane pollution offen occurs to some degree in practical applications of ultrafiltration membranes technology,which seriously affects their utilization in the field of water treatment.Therefore,the to hydrophilic modificationandfouling inhibition of ultrafiltration membranes remain a challenging task.In this study,GO@Fe₃O₄ and GO@ZnO nonocomposites were synthesized andused as modifiers,PES/GO@Fe₃O₄ and PES/GO@ZnO membranes were prepared by non-solvent induced phase separation method.Through scanning electron microscopy,water contact angle test,membrane flux and rejection test,mechanical performance test and photocatalytic performance test,the microscopic morphology,hydrophilicity,separation performance,mechanical performance,anti-pollution performance and photocatalytic performance of the membrane are tested by means were studied.Firstly,the GO@Fe₃O₄ magnetic nanocomposite was prepared by the hydrothermal method,and it was found that the Fe₃O₄ nanoparticles with cubic crystal structure were uniformly loaded on the GO surface.GO@Fe₃O₄ can be easily separated and recovered under the action of a magnetic field.The GO@Fe₃O₄nonocomposite is effective tothe removal of MB,and the adsorption capacity was as high as 180 mg/g.The PES/GO@Fe₃O₄ mixed matrix membrane was prepared by the phase inversion method.The resultsshowedthat with the increasing amount of GO@Fe₃O₄,the hydrophilicity of the membrane was significantly improved,and the flux,tensile strength and anti-fouling performance of the membrane increased first and then decreased.When the content of GO@Fe₃O₄was0.5 wt%,the pure water flux of the membrane reached the maximum value of 162.8L/(m²·h),and the flux recovery rate was 88%.Further,the anti-pollution performance of the membranewas significantly enhanced.Secondly,three GO@ZnO nanocomposites with different morphologies were prepared by hydrothermal method,and the effects of hydrothermal temperature,hydrothermal time and GO addition on the morphology of GO@ZnO were investigated.Selecting Rh B as the target dye,the degradation effect of three kinds of GO@ZnO on Rh B dye was investigated.The results showed that the three different morphologies of ZnO with hexagonal wurtzite structure can be uniformly loaded on GO.At the hydrothermal temperature of 180?,the photocatalytic degradation performance of rod-shaped GO@ZnO on Rhodamine B was the best.The rate can reach 97%.Finally,the rod-shaped GO@ZnO with the best photocatalytic performance was used as the modifier to prepare PES/GO@ZnO mixed matrix membrane.The results showed that compared with PES membrane,the hydrophilicity and anti-fouling properties of PES/GO@ZnO mixed matrix membrane were significantly improved,and the mechanical properties and flux recovery rate of the membrane were significantly enhanced as well.PES/GO@ZnO mixd matrix membrane displayed excellent degradation performance on Rh B,self-cleaning ability and anti-pollution property.