Abstract

In this work, a series of polyetherimide (PEI) flat sheet membranes produced with different concentration of polyvinylpyrrolidone (PVP) addition via phase inversion method. The effects of additions on membrane morphology and performance were investigated. Synthesized membrane had the properties of ultrafiltration membrane. Although PEI is not widely used for water treatment, in this study, the ferrous iron removal rate is investigated and good results are obtained. Through the membrane production experiments, the PEI content was 22 wt%. PVP was added as a pore forming agent with concentrations of 2, 4 and 8 wt%. N-Methyl-2-pyrrolidone (NMP) was used as solvent. Distilled water was used for coagulation bath. After production, all membranes were characterized by using contact angle, permeability, porosity, SEM and FT/IR analyses. With the increasing doses of PVP addition, permeability of PEI membranes produced in this study increased, while porosity results were changeable. The permeability was 23 L/m2h bar for the membrane with 2 wt% PVP content, while the permeability for a membrane with 8 wt% PVP content was 32 L/m2h bar. Contact angles increased with the PVP addition to PEI membranes. With the increasing PVP concentration, the finger like pores and pores located in sub layer expanded.

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