Fabrication of Microporous Polyethylene/PEG Grafted Silica Nanoparticle Mixed Matrix Membrane via TIPS Method
Paper ID : 1128-MST2015-FULL
Ali Akbari, Reza Yegani *, Ali Behboudi
Sahand University of Technology
In this work our main focus is on the fabrication of microporous flat plate membranes using high density polyethylene because of its high mechanical and chemical stability as well as low purchase cost. The main problem of HDPE membranes is low pure water flux (PWF) due to hydrophobic nature of HDPE. In the present study, PEG was used to improve the hydrophilicity and antifouling characteristic of PE membrane. In order to retain PEG into the membrane matrix and avoid the PEG washing out, synthesized PEG grafted silica nanoparticles (PEG-g-silica NPs) were utilized to fabricate mixed matrix PE membrane. For this purpose, HDPE/PEG-g-silica NPs mixed matrix membranes were fabricated via thermally induced phase separation (TIPS) method. Mineral oil and acetone were used as diluents and extractor in the fabrication of membranes, respectively. The morphology of prepared membranes was examined using a Field Emission Scanning Electron Microscopes (FE-SEM). As a result of FE-SEM images, HDPE/PEG-g-silica NPs mixed matrix membranes had more surface porosity compared to pure HDPE membranes. Also, Back Scattered Electrons (BSE) mode of FE-SEM was used to show the dispersion of nanoparticles into prepared membrane morphology. EDX test was used to confirm the presence of -Si- group in the prepared mixed matrix membranes. Comparing of pure water flux (PWF) of membranes illustrated that the water flux of PEG-g-silica NPs/HDPE membrane is about 7.45-folds higher than that of pure HDPE membrane.
HDPE, PEG-g-silica NPs, Mixed matrix membrane, TIPS method
Status : Paper Accepted (Oral Presentation)