Study on the effect of modified PVDF ultrafiltration membrane for secondary effluent of urban sewage

The cross-linked poly(vinyl alcohol) (PVA)/poly(vinylidene fluoride) composite flat sheet membranes were successfully prepared by phase inversion method. Ferric trichloride (FeCl3) particles were used as cross-linker. PVA is cross-linked during the membrane fabrication. The structures of formed memb...

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Bibliographic Details
Published in:Desalination and water treatment 2014-07, Vol.52 (25-27), p.5084-5091
Main Authors: Danxi, Huang, Lei, Wang, Xiaorong, Meng, Xudong, Wang, Juanli, Bai
Format: Article
Language:English
Subjects:
Antifouling
Cross-linking
Crosslinking
Flux
Fouling
Fourier transforms
Hydrophilic modification
Infrared spectroscopy
Membranes
Polyvinyl alcohols
Secondary effluent
Ultrafiltration
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Summary:The cross-linked poly(vinyl alcohol) (PVA)/poly(vinylidene fluoride) composite flat sheet membranes were successfully prepared by phase inversion method. Ferric trichloride (FeCl3) particles were used as cross-linker. PVA is cross-linked during the membrane fabrication. The structures of formed membranes were investigated using scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR). The hydrophilic contact angle, pure water flux, and tensile strength were measured to assess the membrane performance. The antifouling performance of modified membrane for the secondary effluent of urban sewage was evaluated by flux decline, washing recovery rate, fouling resistance analysis, and fractions distribution of different hydrophilicities. FTIR showed that the peak intensity, attributed to –OH groups, decrease gradually with the increase of FeCl3, indicating the formation of a PVA–Fe3+ net work structure. The addition of cross-linking agent FeCl3 confined the compaction of membranes, thus the fouling resistances of membranes were lower and the water flux was higher. When the weight ratio of PVA to FeCl3 was 1/0.09, the modified membranes had the best UF performance and antifouling property.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2014.883058