Surface properties and interception behaviors of GO-TiO 2 modified PVDF hollow fiber membrane

IF 0.8 4区工程技术 Q4 ENGINEERING, CHEMICAL

Membrane Water Treatment Pub Date : 2019-03-01 DOI:10.12989/MWT.2019.10.2.113

Dongmei Li, Jinling Liang, Min-Tsan Huang, Jun Huang, Li Feng, Shaoxiu Li, Yongshi Zhan

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Abstract

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.

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GO-TiO2改性PVDF中空纤维膜的表面性能及截留行为

为了研究新型改性PVDF膜的表面性质和截留性能，采用界面聚合法结合泵吸过滤法，对氧化石墨烯（GO）和纳米TiO2（简称改性膜）进行了改性膜对腐殖酸（HA）的过滤实验。结果表明，改性膜的接触角（表征亲水性）从80.6+/-1.8度降低到38.6+/-1.2度。经GO和TiO2包覆后，PVDF膜表面的F元素从60.91%下降到17.79%。O/C元素质量比增加了五倍，O元素在改性膜表面的百分比从3.83wt%增加到20.87%。改性膜的表面充满了亲水性极性基团（如-COOH、-OH、C-O、C=O、N-H）和功能性亲水性GO-聚酰胺-TiO2复合构型。这种配置为GO和TiO2在膜表面上的牢固附着以及更高的通量提供了刚性网络结构。改性膜的总通量衰减率从原来的51.2%下降到35.6%。不可逆衰减率下降了71%。HA在改性膜上的静态截留量为158.6mg/m2，是原膜（295.0mg/m2）的一半。通量回收率提高了50%。改性膜对HA的截留率提高了约12%，过滤周期是原膜的2-3倍。

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来源期刊

Membrane Water Treatment ENGINEERING, CHEMICAL-WATER RESOURCES

CiteScore

1.90

自引率

30.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.