Polyamide Modified Blend Nano Membrane

Nanofiltration is a pressure-driven process between reverse osmosis and Ultrafiltration according to basic characteristics [1, 2]. Recently it has obtained a dominant position innumerous processes due to significant advantages such as low operating pressure, high flux and high retention of multivalentsalts [2, 3]. According to mentioned properties, Nanofiltration membranes are widely used in food industry, textile industry, chemical industries and water and wastewater treatment.However, the main inevitable disadvantage of these membranes is fouling which occurs due to undesiredinteractions between potential foulants and membrane surface [4, 5]. Common polymers used in preparation of industrial membranes are mostly hydrophobic. Thereforehydrophilization of membrane surface would be an initial purpose to decrease membrane fouling [5, 6, 7]. Attemptshave been made in this work to prepare a membrane based on solution of polyamide and poly- (ethylene co- vinyl alcohol) in formic acid in order to increase the hydrophilicityproperties of polyamide membranes. The optimized ratio for PA/EVOH was considered 75/25, based on studies [8]. Asymmetric PA/EVOH membranes were prepared employing phase inversion technique in a ternary system whereby water was applied as non-solvent. Effects of evaporation time alongside with coagulation bath temperature on membrane performance and morphology were studied