Preparation And Properties Of Ultrafiltration Membrane Based On Sulfonated Poly (Aryl Ether Ketone Sulfone) Containing Carboxyl Groups

With the advent of the industrial age,the process of industrialization has developed rapidly.Human life becomes more convenient,but the problem of water shortage that for people all over the world also comes.Therefore,water resources protection included how to make better use of water resources and how to make secondary use of polluted water has become the main theme of contemporary.So,membrane separation technology has attract the public attention due to convenient operation and low energy consumption.Among them,ultrafiltration?UF?has received wide attention in the field of water treatment owing to its low energy consumption,environmental friendliness,high flux,and good retention of macromolecular substances.However,there are some bottlenecks during the development of ultrafiltration technology:more serious membrane fouling and it is not possible to achieve higher waterflux while maintaining a higher retention rate.These problems severely limit the development and application of ultrafiltration technology.The structure and chemical properties of membrane materials are closely related to these issues.Therefore,people have focused on finding membrane materials with better chemical properties.Sulfonated poly?arylene ether ketone sulfone?s as an excellent traditional engineering plastic has good thermal stability.It also has good chemical stability.However,this membrane material has been widely used only in the field of fuel cells.From the perspective of molecular design,by adjusting the proportion of each component,Sulfonated poly?aryletherketone sulfone?s containing carboxyl groups with different sulfonation degrees were prepared.It was prepared as an ultrafiltration membrane using a phase inversion?NIPS?method.The sulfonic acid group has good hydrophilicity and can contribute to the hydrophilicity of the membrane.The morphology,hydrophilicity,mechanical properties,thermal properties and ultrafiltration performance of the prepared membrane materials were characterized and tested.The results showed that as the content of sulfonic acid groups increased,the top surface of the membrane were more likely to form a loose and porous structure.As the content of sulfonic acid groups increased,the mechanical properties of the membrane have also decreased,the thermal stability were better,and the hydrophilicity were enhanced,the water contact angle decreased from 83.6?to 63.4?.Pure water flux has been slightly reduced,while retention has been increased.The ability to resist pollution has increased as the content of sulfonic acid groups increasedthat the irreversible pollutant decreased from 41.8%to 14.3%?In order to further improve the performance of the ultrafiltration membranes,the amine functionalized SBA-15 was selected as the nano-hydrophilic filler and blended to prepare a composite membrane.The morphology,hydrophilicity,mechanical properties,thermal properties and ultrafiltration performance of the prepared membrane materials were characterized and tested.The results showed that as the content of nanoparticles increased,the thermal stability of matri membranes improved and it was easier to form a dense cortex structure of top surface.The flux of the composite membranes were higher than that of the pure membrane,and the flux of M1 was 545.87 Lm^-2h^-1.When the nanoparticle content was 0.1%,the maximum rejection rate was 96%,meanwhile the flux was 419 Lm^-2h^-1.With the increase of nano-particle content,the anti-pollution performance of the composite membrane were enhanced that the irreversible pollutant decreased from 32%to 13%.