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- Title
A Superhydrophilic/Superhydrophobic Janus Membrane for Enhanced On-Demand Inversion Separation of Surfactant-Stabilized Water-in-Oil and Oil-in-Water Emulsions.
- Authors
Xu, Jicheng; Xiong, Qi; Liu, Qing; Jiang, Yan; Yue, Xuejie; Yang, Dongya; Zhang, Tao; Qiu, Fengxian
- Abstract
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.
- Subjects
COCA-Cola Co.; EMULSIONS; POLYETHYLENE terephthalate; MECHANICAL ability; STRUCTURAL stability; POLYACRYLONITRILES; CELLULOSE; OIL spill cleanup
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2024, Vol 49, Issue 6, p8525
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-024-09027-0