Performance improvement of polysulfone ultrafiltration membrane using N-succinyl chitosan as additive

• A water soluble derivative of chitosan was prepared as an additive.
• A new process was developed for blending of NSCS with polysulfone.
• The membranes showed a maximum swelling in the acidic solution of pH = 3.
• The pure water flux of PSf/NSCS (80:20) membrane was ~ 3 times more than that of PSf membrane.
• The PSf/NSCS membranes showed enhanced antifouling property.

A water soluble chitosan derivative, N-succinyl chitosan (NSCS), was blended with polysulfone (PSf) in three different compositions to fabricate PSf/NSCS blend membranes. The blending of polymers was confirmed by Attenuated Total Reflectance Infra-Red (ATR-IR) spectroscopy. The membranes were characterized by Scanning Electron Microscopy (SEM) images for their cross-sectional morphology. Pure water flux, water uptake and contact angle of the PSf/NSCS blend membranes were measured and compared with the pristine polysulfone membrane. The PSf/NSCS blend membranes showed enhanced hydrophilicity and permeation fluxes compared to the pristine polysulfone membrane. The membrane antifouling property was determined by filtering the bovine serum albumin (BSA) solution. The maximum flux recovery ratio (FRR) of 70% was observed by the PSf/NSCS blend membrane with 20% NSCS content. The PSf/NSCS membranes with the PSf:NSCS ratios of 80:20 and 90:10 showed nearly the same fluxes as those of polysulfone/polyethylene glycol (PSf/PEG) blend membranes with the same compositions. The hydrophilic derivative of chitosan NSCS acted as an excellent additive in improving PSf ultrafiltration properties.

A new blend was prepared using polysulfone and water soluble chitosan derivative. The blend was confirmed by ATR-IR studies. The maximum flux recovery ratio (FRR) of 70% was observed by the PSf/NSCS blend membrane with 20% NSCS content.Figure optionsDownload as PowerPoint slide