چكيده به لاتين
Today, the membrane technology has received more attention due to its excellent features such as low-cost, good performance, simple usability, energy efficiency, and high operational flexibility. Meanwhile, ultrafiltration (UF) as a membrane separation process operating with pressure difference driving force is used in food and biological industrial, water and wastewater treatment, environmental protection and other fields to separate various particles such as macromolecules, proteins, and generally higher molecular weight solvents from different solutions. One of the most important problems in the UF processes is fouling, which can be caused by concentration polarization and cake formation, thereby lowering the membrane efficiency and reducing its lifetime. In this work, Fe3O4/GO nanohybrids were synthesized successfully and used to prepare a novel ultrafiltration hybrid membrane (Fe3O4/GO-PES) was prepared by inducing a magnetic field of about 0.1 Tesla during the casting process and by phase inversion method. The effect of the magnetic field on the characteristics of the membrane was investigated. It was observed that Fe3O4/GO nanohybrids could move above the membrane surface by magnetic field gravity, altering the structure of the thin layer, and making the membrane surface more hydrophilic and increasing the pure water flux. The migration of nanohybrids to the upper surface of the membrane was confirmed by FESEM and EDS analysis. In addition, hydrophilicity of the modified membrane increased by about 35% by reducing the contact angle from 73.43° for the neat PES membrane to 53.9° for the modified membrane (M-Fe3O4/GO). The flux increased by 76.2% from 143 (L / m2.h.bar) for the neat PES membrane to 252 L/m2.h.bar for the modified membrane. The modified membrane showed high rejection towards bovine serum albumin (above 92%) and flux recovery ratio (87.9%). The reduction in total fouling from 84.35% for the neat PES membrane to 41.5% for the modified membrane showed a significant reduction in fouling. Therefore, this study presents a new strategy for the development of high-efficiency hybrid membranes by manipulating nanomaterials on the membrane surface instead of embedding them in the membrane matrix.
