چكيده به لاتين
Abstract:
Nowadays, water and wastewater treatment has gained many interests due to water scarcity. Therefore, nanofiltration and reverse osmosis processes are prevalent in desalinization and heavy metallic ions removal. Nanofiltration membranes have gained many interests due to high flux and proper heavy metal rejection. In nanofiltration processes, steric hindrance and concentration polarization based on Donnan effect are two most important ion removal mechanisms, therefore, charged nanofiltration membranes are more important as the higher membrane surface charge, the better membrane performance is due to improved Donnan effect. In order to successful fabrication of positively charged nanofiltration membranes by Polyethylene imine, the substrate membrane should present demonstrate proper properties such as surface roughness for physical attraction and negative charge for enhanced electrostatic attraction forces. Polyethersulfone and matrimid miscibility were investigated in order to obtain compatible blend membranes at 16 and 18 wt.%. the permeance of 318 LMH/bar and 285 LMH/bar were achieved at desirable samples of 16 and 18wt.%. fabricated ultrafiltration blend membranes were able to reject BSA more than 95%. Fouling parameters and models depicted lower fouling ration and a shift toward cake layer filtration model with increase in matrimid content. FESEM results revealed successful formation of nanofiltration layer on blend membranes, unlike neat samples. PES/Matrimid Blend substrate based nanofiltration membranes exhibited similar performance in permeance and rejection studies of 1000 ppm solution of MgSO4, MgCl2 and NaCl salts which was 50,16 and 20 LMH/bar in case of permeance and 71.6, 57 and 60% in case of rejection for each salt, respectively.
Keywords: Nanofiltration, Polyethersulfone, Matrimid, Blend, Desalinization
