A Superhydrophilic/Superhydrophobic Janus Membrane for Enhanced On-Demand Inversion Separation of Surfactant-Stabilized Water-in-Oil and Oil-in-Water Emulsions

Janus membrane materials have received widespread attention in oily wastewater due to their special wettability and high selectivity, however, the poor structural stability and weak mechanical properties of membrane significantly restrain the practical application. Herein, cellulose was used as the...

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Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2024, Vol.49 (6), p.8525-8534
Main Authors: Xu, Jicheng, Xiong, Qi, Liu, Qing, Jiang, Yan, Yue, Xuejie, Yang, Dongya, Zhang, Tao, Qiu, Fengxian
Format: Article
Language:English
Subjects:
Cellulose
Dopamine
Efficiency
Emulsions
Engineering
Humanities and Social Sciences
Hydrophilicity
Hydrophobicity
Mechanical properties
Membranes
multidisciplinary
Polyethylene terephthalate
Research Article-Chemical Engineering
Science
Separation
Structural stability
Wastewater
Water purification
Wettability
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Summary:Janus membrane materials have received widespread attention in oily wastewater due to their special wettability and high selectivity, however, the poor structural stability and weak mechanical properties of membrane significantly restrain the practical application. Herein, cellulose was used as the membrane matrix and modified with dopamine as the hydrophilic modifier and adhesive to obtain a polydopamine/cellulose superhydrophilic membrane (PDA/CM). Secondly, the polyethylene terephthalate (PET) electrospinning solution prepared from waste Coca-Cola bottles was used to electrospin PET membrane on the surface of PDA/CM superhydrophilic membrane to form hydrophobic PET layer, and finally obtained PET/PDA/CM Janus membrane with asymmetric wetting properties. The PDA/CM membrane side exhibits superhydrophilicity, which can separate various oil-in-water emulsions with efficiency of above 98%. Oppositely, the PET side owns hydrophobicity, which can separate various water-in-water emulsions with efficiency of above 98.7%. After 10 cycles, the separation efficiency remained over 98.6% for oil-in-water emulsions and 98.5% for water-in-oil emulsions, demonstrating its good recycling ability. Moreover, compared with the original cellulose membrane, the obtained Janus membrane has stronger mechanical properties, and because PDA acts as a structural adhesive between the two layers, the membrane does not delaminate during the mechanical stretching process. This study provides a novel strategy for design stability structure and enhanced mechanical ability of Janus membrane toward oily wastewater purification in the future.
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-024-09027-0