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Membrane Water Treatment Volume 9, Number 5, September 2018 , pages 317-325 DOI: https://doi.org/10.12989/mwt.2018.9.5.317 |
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In-situ modification of PVC UF membrane by SiO2 sol in the coagulation bath during NIPS process |
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Liang Cheng, Zhen-Liang Xu, Hu Yang and Yong-Min Wei
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| Abstract | ||
| Polyvinyl chloride (PVC) ultrafiltration (UF) membrane was modified by silica sol in the coagulation bath during non-solvent induced phase separation (NIPS) process. The effects of silica sol concentrations on the morphology, surface property, mechanical strength and separation property of PVC UF membranes were systematically investigated. PVC membranes were characterized by Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), contact angle goniometry and tensile strength measurement. The results showed that silica had been successfully assembled on the surface of PVC UF membrane. With the increase of silica sol concentration in the coagulation bath, the morphologies of PVC UF membranes changed from cavity structure to finger-like pore structure and asymmetric cross-section structure. The hydrophilicity and permeability of PVC UF membranes were further evaluated. When silica sol concentration was 20 wt.%, the modified PVC membrane exhibited the highest hydrophilicity with a static contact angle of 36.5 degree and permeability of 91.8 (L.m-2.h-1). The structure of self-assemble silica had significant impact on the surface property, morphology, mechanical strength and resultant separation performance of the PVC membranes. | ||
| Key Words | ||
| polyvinyl chloride; surface modification; silica sol; ultrafiltration membrane | ||
| Address | ||
| State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, East China University of Science and Technology (ECUST), 130 Meilong Road, Shanghai 200237, China | ||
