期刊
JOURNAL OF MEMBRANE SCIENCE
卷 570, 期 -, 页码 418-426出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.10.028
关键词
Hydrophobic; Hydrophilic; Underwater superoleophobicity; Membrane distillation; Desalination
资金
- ADNOC Refining Research Center
Meeting environmental discharge or reuse water qualifies and freshwater demands requires the development of innovative processes like membrane distillation (MD) for treating oily wastewater. Desalinating oily wastewater through MD is, however, challenging because of immediate contamination and wetting of the membrane caused by oil or other low surface tension contaminants. In this work, a novel concept of stacking two membranes with different wettabilities to obtain a dual-layered membrane was developed. The hydrophilic top layer, composed of electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and regenerated cellulose, displayed superoleophobicity underwater and prevented oil passage to the hydrophobic PVDF-HFP bottom layer during MD process. When tested in direct contact MD of saline feed containing 1000 ppm of oil, the stacked duallayered membrane yielded fresh water flux up to 12.8 kg m(-2) h(-1) with complete salt rejection.
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