Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 23, Pages 27635-27644Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c05896
Keywords
nanofibrous membrane; hierarchical structure; pH responsive; UCST; oil/water separation
Funding
- National Key R&D Program of China [2017YFB0309600]
- National Natural Science Foundation of China [51973195]
- Excellent Postgraduate Thesis Program of Zhejiang Sci-Tech University [2020-LW-YP20200003]
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A dual-responsive nanofibrous membrane with high water-in-oil emulsion separation efficiency and smart cleaning properties has been developed, showing complete restoration of its original separation performance. The membrane exhibits different hydrophilic/oleophilic properties under different conditions, achieving efficient separation of water-in-D5 emulsions at room temperature.
Membrane fouling is a major challenge for long-term oil/water separation. The incomplete degradation of organic pollutants or membrane damage exists in the common methods of membrane regeneration. Herein, a dual-responsive nanofibrous membrane with high water-in-oil emulsion separation efficiency and smart cleaning properties is reported, which shows complete restoration of its original separation performance. The pH-responsive and upper critical solution temperature (UCST)-type thermoresponsive nanofibrous membrane with a micro/nanosphere structure was developed via a one-step-blending electrospinning strategy. The membrane displays high hydrophobicity/oleophilicity at pH 7 and 25 degrees C and hydrophilicity/oleophobicity at pH 3 and 55 degrees C. As a result, it exhibits an ultrahigh permeability of 60528.76 L m(-2) h(-1) bar(-1) and a separation efficiency of 99.5% for water-in-D5 emulsions at room temperature (25 degrees C). Moreover, the contaminated membranes could be easily reclaimed by being rinsed with warm acidic water (pH 3 and 55 degrees C). The membrane maintained high separation performance after being used for multiple cycles, indicating its scalable application for purifying emulsified oil. This study provides a facial method of constructing membranes with multiscale hierarchical structures and a new idea for the design of recyclable oil/water separation membranes.
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