Novel positively charged nanofiltration (NF) membranes have been fabricated using sulfonated polyphenylenesulfone (sPPSU) support with hydrophilic properties and fully sponge-like morphology via UV-induced grafting. The resultant NF membranes with a mean effective pore diameter of 1.13-1.20nm, molecular weight cut off (MWCO) of 1627-1674Da and high pure water permeability (PWP) of 9-14LMHbar -1 can be successfully developed by utilizing two different types of positively charged grafting monomers. In view of salt rejections of the resultant NF membranes, it follows the order R(MgCl 2)>R(NaCl)>R(MgSO 4)>R(Na 2SO 4) with high rejections to MgCl 2 of up to 95.20%. Furthermore, the newly developed NF1 and NF2 membranes demonstrate an impressive prospect for the dye removal from wastewater treatment. Due to their positive surface charges, a superior rejection of up to 99.98% to Safranin O dye can be achieved by NF1 and NF2 membranes. Characterizations of the two NF membranes were further done to elucidate the difference in performance and a variety of factors such as pore size, surface roughness, selective layer thickness and zeta potential were established as the controlling factors.
- Dye removal
- Positively charged NF membrane
- UV-initiated grafting
ASJC Scopus subject areas
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation