(473b) Study On Formation Mechanism of Polyamide Reverse Osmosis Nanocomposite Membrane Containing Naa Nano-Zeolite

The polyamide (PA) thin film composite membranes containing zeolite nanoparticles have shown has a better RO performance than bare PA membranes. , and zeolite is one of the most popular nano-additives in RO membrane,F for example, many studies have demonstrated show that a higher flux will can be obtained by incorporating NaA zeolite in PA membrane. However, the mechanism of nanocomposite membrane formation is not clearlacked. In this work, NaA-polyamide thin film nanocomposite (TFN) reverse osmosis membranes are fabricated by interfacial polymerization of amine and acid chloride monomers in the presence of NaA zeolite nanocrystals. The effect of introducing the NaA zeolite nanocrystals via the aqueous phase or the organic phase on the membrane morphology and surface properties is investigated by TEM, SEM, ATR-FTIR, respectively. The desalination performances of theses membranes are measured, and when the zeolite loading exceeded 0.1wt% in organic phase, a doubled flux and increaseding rejection were are obtained, which is superior to the membrane with zeolite added in aqueous phase. Based on above results, the membrane formation mechanism is deducedproposed, and then it is proved by TEM images of membrane cross-section.