Structure Optimization And The Applications Of Nanofiber Microfiltration And Blended Ultrafiltration Membranes By Polyethylene Glycol

The membranes separate matters by the different size with their pore diameter and porosity.Electrospun nanofiber membranes are microfiltration memrbanes;which have small diameters and high porsity and are widely applied in environment and pharmaceutics.However,the control on their structure and the effect of structure on the application were seldomly studied.The asymmetric porous ultrafiltration membranes have been widely applied in industrial and daily life.We have already fabricated a PSF-g-SBMA blended membrane with high antifouling ability.But the structure has not been optimized yet.Hence,this study will get the optimized structure of the nanofiber microfiltration and porous ultrafiltration membranes by the addition of PEG or PEO,for their applications in demulsification,cell culture and air filtration.Firstly,PEO(900 KDa)was added into the cast solution to obtain polysulfone(PSF)and polyethersulfone(PES)nanofibers with rough surface.With the increased PEO content,the nanofibers became porous and rough,while the membrane became loose and weak in strength.The polystyrene(PS)and PEO are immiscible,so PEG(1000 Da)was used to control PS nanofiber structure.PS nanofiber without PEG was of bead structure.With the addition of PEG,PS nanofiber diameter is uniform,but the surface of nanofiber is smooth rather than roughness.Secondly,the fabricated electrospun nanofiber membranes were applied in the demulsification,cell culture and air filtration.As found,1%PEO/PS membrane showed the highest soy bean oil sorption capacity of about 200 g/g,while 1%PEO/PES membrane was of highest diesel sorption capacity of 45 g/g.Hence,1%PEO/PS and 1%PEO/PES membranes were chosen for demulsification of soy bean oil and diesel emusion solution.As expected,the 1%PEO/PS and 1%PEO/PES membranes could absorb the oil and then damaged the emusion solution with 100?10000 ppm oil.For the cell culture,the 1%PEO nanofiber membranes with rough surface can promote cell differentiation and shorten the culture period.For air filtration,PSF nanofiber membranes showed better filtration performance than other types of masks under the same pressure,with 90%rejection of PM 2.5(particles<2.5 um).Finally,the antifouling PSF-g-SBMA membrane was fabricated by controlled chemical synthesis and membrane made process.With increased PEG content(10%?20%?30%?40%?60%,as the ratio of PEO/PSF),the pure water flux and flux of membranes during ultrafiltration increased and the membrane became more loose.In addition,the PEG has no effect on the properity of antifouling..In conclusion,the optimization of membrane structure can improve the application performance of membranes and extend their application fields.This study will futher benifit the application of nanofiber membranes and antifouling membranes in different fields.