Fabrication of a high-flux sulfonated polyamide nanofiltration membrane: Experimental and dissipative particle dynamics studies

摘要: Abstract Novel high-flux thin film composite (TFC) nanofiltration (NF) membranes were fabricated via interfacial polymerization (IP) on a polysulfone substrate using 2,2′-benzidinedisulfonic acid (BDSA) as the amine monomer in aqueous solution. The intrinsic resistance of resulting ( R m ) was found to be low 2.37×10 13  m −1 , indicating considerably tolerance against hydraulic resistance. optimized membrane TFC-1.0 showed excellent rejection towards different inorganic electrolyte solutions following order: Na 2 SO 4 >NaCl>MgCl >CuSO >MgSO negatively charged nature membrane. Surface properties evaluated by field emission scanning electron microscopy (FE-SEM), atomic force (AFM) and contact angle measurements, results indicated smooth moderately hydrophobic surface. Using dissipative particle dynamics (DPD), coarse-grained model molecules at mesoscale level used establish an oil-water interface with regard current IP process. orientation BDSA monomers studied it that most sulfonic groups facing solution, while outer faces covered nanoaggregates rigid polymer backbones. This finding is consistent observed experimental provides reasonable explanation for surface properties. NF has high water permeability 16.6 L m −2  h  bar ability salts organic solutes. These confirm suitability this various applications, such desalination dye removal from wastewater.