z-logo
Premium
Preparation and characterization of a novel positively charged nanofiltration membrane based on polysulfone
Author(s) -
Akbari Ahmad,
Solymani Hosna,
Rostami Sayed Majid Mojallali
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41988
Subject(s) - polysulfone , nanofiltration , membrane , ultrafiltration (renal) , chemical engineering , polymer chemistry , fourier transform infrared spectroscopy , scanning electron microscope , interfacial polymerization , aqueous solution , ethylene glycol , materials science , chemistry , nuclear chemistry , polymer , chromatography , monomer , organic chemistry , composite material , biochemistry , engineering
The goal of this study was to prepare positively charged nanofiltration (NF) membranes to remove cations from aqueous solutions. A composite NF membrane was fabricated by the modification of a polysulfone ultrafiltration support. The active top layer was formed by the interfacial crosslinking polymerization of poly(ethylene imine) (PEI) with p ‐xylene dichloride (XDC). Then, it was quaternized by methyl iodide (MI) to form a perpetually positively charged layer. The chemical and morphological changes of the membrane surfaces were studied by Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy. To optimize the membrane operation, the PEI solution concentration, PEI coating time, XDC concentration, crosslinking time, and MI concentration were optimized. Consequently, high water flux (5.4 L m −2 h −1 bar −1 ) and CaCl 2 rejection (94%) values were obtained for the composite membranes at 4 bars and 30°C. The rejections of the NF membrane for different salt solutions, obtained from pH testing, followed the order Na 2 SO 4  < MgSO 4  < NaCl < CaCl 2 . The molecular weight cutoff was calculated by the retention of poly(ethylene glycol) solutions with different molecular weights, and finally, the stoke radius was calculated as 1.47 nm. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41988.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here