Preparation And Properties Of Polyarylene Ether Nitrile Nanofiber Membrane

Nanofiber membranes（NFM）prepared by electrospinning technology have been increasingly utilized in the field of water treatment due to their exceptional porosity,unique pore structure,and ultra-high specific surface area,making them easily functionalized to suit various needs.In particular,NFM have significant practical applications in the adsorption and selective separation of various organic mixed dyes.Furthermore,super-wetting NFM with antimicrobial properties is considered a promising strategy for solving oil/water emulsion（O/W）separation problems.Therefore,the development of nanofiber membrane materials with dye separation,O/W separation,and antibacterial properties is of great practical significance.Polyarylene ether nitirle（PEN）is an organic polymer functional material with advantages such as high temperature resistance,corrosion resistance,easy processing,and good biocompatibility due to the existence of rigid aryl groups and flexible ether bonds in the main chain of the molecule.In this study,a large number of sulfonic acid functional groups were introduced into PEN by nucleophilic substitution condensation reaction,and electrospinning technology was used to prepare it into nanofiber membrane materials to explore its comprehensive applications in dye adsorption and separation,oil-water separation,and antibacterial fields.The specific research contents are as follows:（1）In this study,PENs were synthesized using bisphenol A（BPA）,potassium hydroquinone sulfonate（HQS）,and 2,2-difluoro benzonitrile as monomers,catalyzed by anhydrous potassium carbonate.By adjusting the molar ratio of BPA and HQS,three different structures of PEN（Bm Sn）were prepared,and then electrospinning into NFMs.The results showed that with the increase of sulfonic acid content,the mechanical properties and thermal stability of the NFM gradually decreased.（2）The PEN NFM with the highest sulfonic acid group content（PEN（B3S7））exhibited a maximum adsorption capacity of 796.25 mg/g for methylene blue cationic organic dye.The optimized PEN（B5S5）NFM can rapidly and selectively separate cationic dyes from mixed dyes.Even after 8 separation and regeneration cycles,the removal efficiency of cationic dyes still exceeded 99%.Due to its ease of manufacture,high selectivity,and good recyclability,the proposed approach in this study opens up a new pathway for the production of advanced separation membranes for wastewater purification.（3）In-situ growth of silver nanoparticles（Ag NPs）on the surface of sPEN nanofiber membrane was carried out to prepare a composite material Ag@sPEN nanofiber membrane.The experimental results showed that the in-situ grown Ag NPs not only improved the thermal and mechanical properties of the sPEN matrix but also endowed the composite nanofiber membrane with super-hydrophilic/underwater super-oleophobic properties.Meanwhile,Ag@sPEN exhibited a high flux of 3597±212 L m^-2 h^-1 for O/W separation under a pressure difference of 0.09 MPa,and showed strong antibacterial activity against both gram-positive and gram-negative bacterial strains.Based on its ease of manufacture and excellent O/W separation performance,this study provides a new strategy for designing nanofiber membranes for environmental remediation.