期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 287, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120575
关键词
Nanofiber membrane; Polytetrafluoroethylene; Oil-water separation; Demulsification
资金
- Ministry of Science and Technology of China [SQ2020YFF0409692]
This research combines electrospinning and electrospraying technology to construct a Polytetrafluoroethylene (PTFE) nanofiber membrane (NFM) for efficient oily wastewater treatment. The membrane shows excellent separation performance for oil-water mixtures and surfactant-stabilized emulsions. These NFMs have the potential to be applied in low-pressure driven membrane separation systems for preliminary separation of different types of oily wastewater.
Oily wastewater treatment is an arduous and urgent global problem. Electrospinning has wide applications in construction of high-efficiency oil-water separation membranes. Herein, electrospinning and electrospraying technology were combined to construct a Polytetrafluoroethylene (PTFE) nanofiber membrane (NFM) with multileveled structure for oily wastewater treatment. The separation performance (driven by gravity) of the NFM to oil-water mixture was studied. In addition, the demulsification performance of the NFM to water-in-oil surfactant-stabilized emulsions (W/O SSEs) under gravity and oil-in-water surfactant-stabilized emulsions (O/W SSEs) at 0.5 bar were studied subsequently. The results showed that the flux of the 9% D-H-PTFE to the oil-water mixture reached 4909 L m(-2) h(-1), with a separation rate of 99.99%; the flux to the CCl4 W/O SSE reached 1867.93 L m(-2) h(-1) with the separation rate of 98.46%. The flux to the CCl4 O/W SSE was 122 L m-(2) h(-1) and the separation rate was 98.40% in multiple cycles. Therefore, these NFMs are expected to be practically applied to a low-pressure driven membrane separation system for preliminary separation of different types of oily wastewater.
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