Characteristics of membranes fabricated from polysulfone and zwitterion copolymer-grafted MWCNT
Paper ID : 1151-MST2015-FULL
Authors:
Mehdi Mahmoudian
Nanotechnology research center, Urmia University
Abstract:
Carbon Nanotubes (CNTs) with high hydrophilicity, good chemical stability, high surface area, high aspect ratio and high axis strength are ideal materials for reinforcing membranes. But there are problems in preparing mixed matrix membranes using this material, such as no suitable dispersion of synthesized CNTs in organic solvents and different polymers. So, surface modification of this material is necessary to fabricate a homogeneous nanocomposite membrane. For this purpose Multi Wall Carbon Nanotube (MWCNT) was functionalized with a zwitterion copolymer which consists of diallyldimethylammonium chloride and acrylic acid monomers. Functionalization is carried out in to manners. Once a copolymer containing of these monomers was prepared and grafted to MWCNT by a linking agent and once more insitu polymerization of monomers was applied for grafting of resulting copolymer from MWCNT’s surface. Consequently modified CNTs were used in polysulfone nanocomposite membrane. Porous nanocomposite membranes were synthesized by the phase inversion method via incorporation of modified CNT into the membrane casting mixture, followed by immersion into the coagulation bath.

Utilization of functionalized CNT in polysulfone membranes can improve the performance of the membrane. FT-IR, TGA and UV spectroscopy were used to confirm the modified reactions. Hydrophilicity of membranes Investigated by water contact angle. Morphology of prepared membranes was obtained by FESEM. Water flux, salt and dye rejection for prepared membranes were assessed by Nanofiltration cell.
Keywords:
nanocomposite membrane, MWCNT, polysulfone, zwitterion
Status : Paper Accepted (Poster Presentation)