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Membrane Water Treatment   Volume 10, Number 2, March 2019, pages 113-120
DOI: https://doi.org/10.12989/mwt.2019.10.2.113
 
Surface properties and interception behaviors of GO-TiO2 modified PVDF hollow fiber membrane
Dongmei Li, Jinling Liang, Mingzhu Huang, Jun Huang, Li Feng, Shaoxiu Li and Yongshi Zhan

 
Abstract     [Buy Article]
    To investigate surface properties and interception performances of the new modified PVDF membrane coated with Graphene Oxide (GO) and nano-TiO2 (for short the modified membrane) via the interface polymerization method combined with the pumping suction filtration way, filtration experiments of the modified membrane on Humic Acid (HA) were conducted. Results showed that the contact angle (characterizing the hydrophilicity) of the modified membrane decreased from 80.6+/-1.8 degree to 38.6+/-1.2 degree. The F element of PVDF membrane surface decreased from 60.91% to 17.79% after covered with GO and TiO2. O/C element mass ratio has a fivefold increase, the percentage of O element on the modified membrane surface increased from 3.83 wt% to 20.87%. The modified membrane surface was packed with hydrophilic polar groups (like -COOH, -OH, C-O, C=O, N-H) and a functional hydrophilic GO-polyamide-TiO2 composite configuration. This configuration provided a rigid network structure for the firm attachment of GO and TiO2 on the surface of the membrane and for a higher flux as well. The total flux attenuation rate of the modified membrane decreased to 35.6% while 51.2% for the original one. The irreversible attenuation rate has dropped 71%. The static interception amount of HA on the modified membrane was 158.6 mg/m2, a half of that of the original one (295.0 mg/m2). The flux recovery rate was increased by 50%. The interception rate of the modified membrane on HA increased by 12% approximately and its filtration cycle was 2-3 times of that of the original membrane.
 
Key Words
    GO-TiO2 modified PVDF membrane; hydrophilicity; the flux attenuation rate; antifouling performance; interception behaviors
 
Address
Dongmei Li, Jinling Liang,Jun Huang, Li Feng, Shaoxiu Li : Faculty of Civil and Transportation Engineering, Guangdong University of Technology, 510006, Guangzhou, Guangdong, China
Mingzhu Huang: Foshan Water Affairs Group Co. Ltd., 528500, Foshan, Guangdong, China
Yongshi Zhan: The Affiliated High School of South China Normal University, 510000, Guangzhou, Guangdong, China.
 

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