Preparation and Characterization of Al_2O_3/TiO_2/PVDF polymer composites ultrafiltration membrane

摘要

The polymer polyvinylidene fluoride (PVDF) membranes were modified by blending with nanometer particles to improve its hydrophilic property and anti-fouling performances in the process of waste water treatment. The organic macromolecule composite ultrafiltration (UF) membranes modified by the inorganic nanometer TiO_2 and Al_2O_3 were prepared by a phase inversion process. The composite membranes performances, such as water flux, mechanical strength, water contact angle, retention rate, pores size and pores size distribution, were compared to those of organic membranes. The surface and sectional structures of membranes were observed by scanning electron microscope (SEM). The experimental results show that the composite membrane water fluxes increases 79.5% than that of organic membrane with 3% nanometer particles addition and the proportion of TiO_2 and Al_2O_3 is 1:1. The composite membrane average pore size is larger than that of organic membrane and the pore size distribution is more uniform. The composite UF membrane has not only maintained PVDF membrane's favorable performances but also improved its permeation performance, intensity, hydrophilic and anti-fouling performances.