Abstract
Poly(ethersulfone) (PES) / poly(vinylpyrrolidone) (PVP) blend membranes modified with calcium chloride (CaCl2) were prepared by phase inversion method. Effect of CaCl2 on the morphology, filtration and performance characteristics of the PES/PVP membranes was studied in detail. Results indicated that CaCl2 blend membranes possessed better porosity and flux than the pristine PES membrane. Dye separation efficiency of CaCl2 blend membranes was also increased considerably. Especially, the PES/PVP blend membrane with 1 wt% CaCl2 showed highest permeate flux and improved dye rejection. Fouling analysis carried out on CaCl2 blend membranes clearly showed that these membranes possessed better antifouling effect than pure PES membrane. Thus the CaCl2 blended PES/PVP membranes are more promising for the treatment of dye polluted wastewater.
Highlights
Membrane separation is one of the largely used advanced separation technologies for the separation of macromolecules from solutions [1]
It has been reported that the addition of hydrophilic additives to the polymeric solution increases the viscosity of the cast dope [39]
Synthesized membranes were characterized by studying the membrane morphology, surface hydrophilicity, equilibrium water content, mechanical strength, porosity and pure water flux
Summary
Membrane separation is one of the largely used advanced separation technologies for the separation of macromolecules from solutions [1]. Organic polymers are more suitable starting materials for the preparation of industrial grade membranes, especially for effluent treatment [4]. The water permeability through pure PES membrane is greatly reduced due to its hydrophobic nature, resulting in very low fluxes [26]. These limitations of PES membrane is overcome by enhancing the surface hydrophilicity of the PES using different methods [27,28,29]. Addition of hydrophilic polymers to the PES matrix increased the permeate flux, serious issues of Performance of PES / CaCl2 Membranes
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