Preparation Of Electrospun PEI/ZIF Nanofiber Membrane And Research On Air Filtration Performance

With the continuous development of the industrialization process,filter materials have received extensive attention in the fields of wastewater and polluted air treatment.In the field of air filtration,nanofiber filter materials are favored by scientific researchers due to their high porosity,designability,etc..Electrospinning nanofiber technology is a method of preparing ultrafine nanofibers.Because of uniform micropores,rich porosity,high specific surface area,thermal stability and rich functional groups,zeolite imidazolate frameworks(ZIFs)show a promising application in the field of high-efficiency air filtration.Therefore,in this study,ZIF-8 and ZIF-67 nanocrystals were doped into polyetherimide(PEI)nanofibers to prepare nanofiber composite membranes by electrospinning technology.In this study,the PEI nanofiber membranes were first prepared by electrospinning technology,and the optimal spinning process parameters were systematacially investigated.On this basis,PEI/ZIF-8 and PEI/ZIF-67 nanofiber composite membranes were successfully prepared through adding different contents of ZIF-8 and ZIF-67 nanocrystals into the PEI spinning solution.SEM,EDX,XRD,FT-IR,TG,CA and other characterizations were conducted to study the physico-chemical properties and surface morphology of composite membranes.The air filtration performance of the prepared PEI/ZIF-8 and PEI/ZIF-67 nanofiber composite membranes were evaluated by using the PM2.5 and PM10 as models to simulate a real haze environment.The results indicate that the PM2.5 filtration efficiency of the PEI/ZIF-8 membrane was 98.12%,and the pressure drop was 29 Pa.The PM2.5 filtration efficiency of PEI/ZIF-67 membrane is 98.68%,the pressure drop is 30 Pa.All the membranes exhibit good thermal stability(200?)and hydrophobicity with a contact angle of up to 140°The polymer/ZIFs combination demonstrated in this work is a useful design strategy for nanofiber composite membranes with high-efficiency air filtration performance and low-resistance.