Abstract
Thin Film Composite (TFC) Polyelectrolyte Multilayer (PEM) Nanofiltration (NF) membrane consisting of multilayer of Poly(diallyl dimethyl ammonium chloride) (PDAC) and Poly(sodium 4-styrenesulfonate) (PSS) deposited on polyethersulfone (PES) support was prepared using spin-assisted layer by layer assembly (SA-LbL). This work is an effort to discover new material having better characteristics and performance than commercial polyamide (PA) NF membrane. Two main operating conditions namely temperature and salt concentration were investigated and the effect of both on membrane performance was studied. Solution-diffusion Film Model (SDFM) membrane employing two fitting parameters i.e. membrane salt permeability (PS) and stagnant layer salt permeability PS(d), was used to explain membrane transport across the membrane. The result showed an good agreement between experimental and observed rejection rate suggests PEM membrane behaves similar to typical solution diffusion-type composite membrane and SDFM can be used to predict the membrane performance and behavior.
Highlights
Nanofiltration (NF) membrane is a relatively new class of pressure-driven membrane lying between reverse osmosis (RO) and ultrafiltration (UF)
Thin Film Composite (TFC) membranes consisting of multilayers of Poly(diallyl dimethyl ammonium chloride) (PDAC)/Poly(sodium 4-styrenesulfonate) (PSS) on PES UF support were successfully fabricated using spin-assisted layer by layer assembly (SA-layer by layer (LbL)) assembly
Both PDAC and PSS were considered strong polyelectrolytes whose degree of ionization remained constant over a wide range of pH values [33,34,35]
Summary
Nanofiltration (NF) membrane is a relatively new class of pressure-driven membrane lying between reverse osmosis (RO) and ultrafiltration (UF). It typically has the pore size of 1 nm corresponding to molecular weight cut-off of 300-500 Da [1]. Commercial Polyamide (PA) NF membrane fabricated through interfacial polymerization on the top of polysulfone (PSF) support shows a superior performance in terms of water flux and salt rejection. Having said that, this membrane exhibits low resistance to fouling, biofouling. Among thin film fabrication methods, layer by layer (LbL) assembly i.e. dip-LbL [6] has been considered as Number of Publication
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