Fabrication of TiO2-modified polytetrafluoroethylene ultrafiltration membranes via plasma-enhanced surface graft pretreatment

⿢Multifunctional TiO2/PAA/PTFE ultrafiltration membrane was fabricated via tight coating of TiO2 functional layer onto the plasma-assisted graft of PAA on PTFE.⿢The high water flux rate, remarkable enhanced ultrafiltration performance and excellent self-cleaning ability were demonstrated.⿢The format...

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Bibliographic Details
Published in:Applied surface science 2016-01, Vol.360, p.749-757
Main Authors: Qian, Yingjia, Chi, Lina, Zhou, Weili, Yu, Zhenjiang, Zhang, Zhongzhi, Zhang, Zhenjia, Jiang, Zheng
Format: Article
Language:English
Subjects:
Antifouling
Contact angle
Filtration
Grafting
Membranes
Plasma-induced graft polymerization
Polytetrafluoroethylene membrane
Polytetrafluoroethylenes
Titanium dioxide
Titanium dioxide (TiO2)
Ultrafiltration
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Summary:⿢Multifunctional TiO2/PAA/PTFE ultrafiltration membrane was fabricated via tight coating of TiO2 functional layer onto the plasma-assisted graft of PAA on PTFE.⿢The high water flux rate, remarkable enhanced ultrafiltration performance and excellent self-cleaning ability were demonstrated.⿢The formation of COOTi bidentate coordination between TiO2 and PAA was responsible for the successful coating. Surface hydrophilic modification of polymer ultrafiltration membrane using metal oxide represents an effective yet highly challenging solution to improve water flux and antifouling performance. Via plasma-enhanced graft of poly acryl acid (PAA) prior to coating TiO2, we successfully fixed TiO2 functional thin layer on super hydrophobic polytetrafluoroethylene (PTFE) ultrafiltration (UF) membranes. The characterization results evidenced TiO2 attached on the PTFE-based UF membranes through the chelating bidentate coordination between surface-grafted carboxyl group and Ti4+. The TiO2 surface modification may greatly reduce the water contact angle from 115.8° of the PTFE membrane to 35.0° without degradation in 30-day continuous filtration operations. The novel TiO2/PAA/PTFE membranes also exhibited excellent antifouling and self-cleaning performance due to the intrinsic hydrophilicity and photocatalysis properties of TiO2, which was further confirmed by the photo-degradation of MB under Xe lamp irradiation.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.11.059