Development of microfiltration membranes based on polysulfone and polyetherimide blends

Abstract

In this study, membranes blended with polysulfone (PSU) and polyetherimide (PEI) polymers in different ratios were fabricated. Their potential to remove pollutants from rivers, which are a potential drinking water source, was investigated. Scanning electron microscopy analysis revealed that the PSU membranes had a dense and homogeneous layer, whereas the addition of PEI formed a spongy substrate. The water content of the fabricated membranes varied between 5.37 and 22.42%, porosities 28.73–89.36%, contact angles 69.18–85.81%, and average pure water fluxes 257.25–375.32 L/m2 h. The blended membranes removed turbidity, chloride, alkalinity, conductivity, sulfate, iron, manganese, and total organic carbon up to 98.32, 92.28, 96.87, 90.67, 99.58, 94.63, 97.48, and 79.11%, respectively. These results show that when PEI was added to the PSU polymer, the filtration efficiency increased owing to an increase in the hydrophilicity of the membranes. Blending these two polymers enabled the optimization of membrane properties such as permeability, selectivity, and mechanical strength. In addition, membrane fabrication processes are simple and incur low costs. HIGHLIGHTS The addition of polyetherimide (PEI) significantly increased the water content and porosity of the polysulfone membranes.; The pure water fluxes of the membranes increased directly to the PEI ratio.; All membranes removed more than 90% turbidity, chloride, alkalinity, conductivity, sulfate, iron, and manganese.; The total organic carbon removal efficiency increased as the PEI ratio increased.;

Keywords

• blended membrane
• membrane fabrication
• membrane morphology
• polyetherimide
• polysulfone
• viscosity