TiO2/PVDF membrane preparation by colloidal precipitation method
Paper ID : 1403-MST2015-FULL
Maryam Tavakolmoghadam *1, Toraj Mohammadi2, Fatemeh Rekabdar3
1Research Institute of Petroleum Industry and Iran university of science and technology
2Faculty of Chemical Engineering, Iran University of Science and Technology (IUST)
3Research institute of petroleum industry
Immobilized TiO2 nanoparticles on flat sheet polymeric membranes have been found effective for fouling reduction in recent researches. The main challenge in this field is to obtain ultrafine and stable nanodispersions. In this study, composite polyvinylidene fluoride/Titanium dioxide (PVDF/TiO2) ultrafiltration membranes were prepared via phase inversion and colloidal precipitation method. Stable TiO2 suspensions were prepared using sodium polymethacrylate as dispersant and sonication without altering of the coagulation bath pH. The effect of different concentrations of TiO2 nanoparticles in the coagulation bath was also investigated. The membrane morphology (distribution of nanoparticles on the membrane surface) was observed by scanning electron and atomic force microscopy. Properties of the neat and the composite membranes were also characterized using energy dispersive X-ray spectroscopy (EDS) and contact angle and membrane porosity measurements. The neat and the composite membranes were further investigated in terms of BSA rejection and flux decline in cross flow filtration experiments. The results showed that the PVDF/TiO2 composite membrane using DMAc/TEP as solvent and 0.05 g/L of TiO2 in the coagulation bath exhibits improved antifouling properties.
Polyvinylidene fluoride (PVDF); Mixed solvents; Immersion precipitation; Colloidal precipitation; Titanium dioxide (TiO2),
Status : Paper Accepted (Oral Presentation)