Abstract
In this study, graphene oxide/iron oxide (GO/Fe3O4) nanohybrids were successfully synthesized through bonding (3-Aminopropyl) triethoxysilane(APTES)-functionalized Fe3O4 with GO nanosheets and then incorporated into polyethersulfone (PES) polymer matrix to fabricate ultrafiltration (UF) mixed matrix membrane (MMM) (GO/Fe3O4/PES) via phase inversion method. A magnetic field of about 0.1 Tesla was induced during the casting process of the membrane solution to fabricate the magnetized GO/Fe3O4/PES membrane (M-GO/Fe3O4/PES) and the magnetic field effect on the membrane characteristics was studied. For better comparison, the Fe3O4/PES membranes with and without induction of magnetic field were also fabricated and compared. It was found that the M-GO/Fe3O4/PES membrane with permeance of 252 L/m2.h.bar and water contact angle (WCA) of 53.9° shows the best performance. As compared with the neat PES membrane, WCA of the M-GO/Fe3O4/PES membrane decreased by 35.0% and its pure water flux (PWF) increased up to 76.2%. The M-GO/Fe3O4/PES membrane showed high rejection towards bovine serum albumin (BSA) of about 92.0% and flux recovery ratio (FRR) of about 87.9%. The reduction in total fouling from 84.35% for the neat PES membrane to 41.50% for the M-GO/Fe3O4/PES membrane showed the effectiveness of the proposed membrane fabrication method. This membrane can be used as support for high quality nanofiltration (NF) and reverse osmosis (RO) membranes, effectively.
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