Abstract
Polysulfone (PSF)/TiO 2 organic–inorganic composite UF membranes were successfully prepared by phase-inversion method with Nano-sized TiO 2 particles dispersed uniformly in 18 wt.% PSF casting solution. The influence of addition nano-sized TiO 2 particles on the morphologies and the properties of such PSF/TiO 2 membranes were investigated through the methods of SEM, XRD, DSC, contact angle goniometer, viscosity measurements, UF experiments and mechanical strength tests. The results showed that the rheological properties of casting solution were changed from Newtonian viscous behavior to non-Newtonian viscous behavior with an increasing viscosity of casting solution and the PSF/TiO 2 composite membranes exhibited differences in morphologies, porosities and properties due to nano-sized TiO 2 addition. At 2 wt.% TiO 2 content, the composite membranes held excellent water permeability, hydrophilicity, mechanical strength and good anti-fouling ability with almost unchanged retentions. The DSC and XRD analysis indicated that there were interactions between TiO 2 nanoparticles and polymers. However higher TiO 2 content (than 2 wt.%) caused a serious nanoparticle aggregation to result in the performances of PSF/TiO 2 membranes decline. The prepared membranes were also exhibited excellent ability to treat emulsified oil wastewater.
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