Modification of PSf/PIAM membrane for improved desalination applications using Chitosan coagulation media

Polysulfone (PSf)/poly (isobutylene-alt-maleic anhydride) (PIAM) nanofiltration membranes were modified by changing the coagulation bath with various concentrations of glutaraldehyde cross-linked Chitosan solutions. The modified membranes showed improved hydrophilicity and reduced pore size. The order of rejection of membranes for various electrolytes was Na2SO4 > MgSO4 > NaCl at minimum pressure of 2 bar.