Photo-Fenton self-cleaning membranes with robust flux recovery for an efficient oil/water emulsion separation

Superhydrophilic/underwater superoleophobic membranes have aroused much research enthusiasm because of their good anti-fouling ability for the treatment of oil-contaminated water. However, such anti-fouling membranes inevitably suffer from fouling during long-term use. Thus, anti-fouling membranes w...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (14), p.8491-8502
Main Authors: Xie, Atian, Cui, Jiuyun, Yang, Jin, Chen, Yangyang, Dai, Jiangdong, Lang, Jihui, Li, Chunxiang, Yan, Yongsheng
Format: Article
Language:English
Subjects:
Antifouling
Antifouling substances
Biofuels
Catalysis
Catalytic activity
Cleaning
Emulsions
Fluctuations
Flux
Fouling
Hydrophilicity
Iron
Membranes
Mineralization
Oil
Oil pollution
Polyvinylidene fluorides
Recovery
Robustness
Separation
Tannic acid
Underwater
Water pollution
Water treatment
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Summary:Superhydrophilic/underwater superoleophobic membranes have aroused much research enthusiasm because of their good anti-fouling ability for the treatment of oil-contaminated water. However, such anti-fouling membranes inevitably suffer from fouling during long-term use. Thus, anti-fouling membranes with excellent self-cleaning performance, fast and superior flux recovery are still greatly required. Herein, the green tannic acid (TA)-Fe( iii ) complex is first assembled onto the polyvinylidene fluoride membrane (PVDF) surface and followed by the in situ mineralization of β-FeOOH to fabricate the PVDF/TA/β-FeOOH membrane for efficient oil/water emulsion separation. The resultant membrane exhibits superhydrophilicity and underwater superoleophobicity with underwater OCA of above 155° for various oils. Importantly, the as-prepared membrane shows fast (within 10 min) and excellent flux recovery (over 98%) attributed to the robust photo-Fenton catalytic activity of β-FeOOH. Moreover, the membrane also displays high separation efficiency (>99.1%) and high flux (1426.8–2106.2 L m −2 h −1 bar −1 ) for a series of oil/water emulsions. This study highlights a new direction in the development of photo-Fenton self-cleaning membranes with fast and robust flux recovery for efficient oil/water emulsion separation.
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA00521H