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Robust, Lightweight, Hydrophobic, and Fire-Retarded Polyimide/MXene Aerogels for Effective Oil/Water Separation
Abstract
Polyimide (PI) aerogels have attracted great attention owing to their low density and excellent thermal stability. However, hydrophobic surface modification is required for PI aerogels to improve their ability in oil/water separation due to their amphiphilic characteristic. Two-dimensional MXenes (transition metal carbides/nitrides) can be utilized as nanofillers to enhance the properties of polymers because of their unique layered structure and versatile interface chemistry. Herein, the robust, lightweight, and hydrophobic PI/MXene three-dimensional architectures were fabricated via freeze-drying of polyamide acid/MXene suspensions and thermal imidization. Polyamide acid was synthesized using N - N -dimethylacetamide and 4,4′-oxydianiline. MXene (Ti 3 C 2 T x ) dispersion was obtained via the etching of Ti 3 AlC 2 and ultrasonic exfoliation. Taking advantage of the strong interaction between PI chains and MXene nanosheets, the interconnected, highly porous, and hydrophobic PI/MXene aerogels with low density were fabricated, resulting in the improved compressive performance, remarkable oil absorption capacity, and efficient separation of oil and water. For the PI/MXene-3 aerogel (weight ratio, 5.2:1) without any surface modification, the water contact angle was 119° with a density of 23 mg/cm 3 . This aerogel can completely recover to its original height after 50 compression–release cycles, exhibiting superelasticity and exceptional fatigue-resistant ability. It also showed high absorption capacities to various organic liquids ranging from approximately 18 to 58 times of their own weight. This hybrid aerogel can rapidly separate the chloroform, soybean oil, and liquid paraffin from the water–oil system. The thermally stable hybrid aerogel also exhibited excellent fire safety properties and outstanding reusability under an extreme environment.
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Metadata
- Authors
- Wang, N.-N., Wang, H., Wang, Y.-Y., Wei, Y.-H., Si, J.-Y., Yuen, A. C. Y., Xie, J.-S., Yu, B., Zhu, S.-E., Lu, H.-D., Yang, W., Chan, Q. N., & Yeoh, G.-H.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-10-02
- Volume
- 11
- Issue
- 43
- Pages
- 40512-40523
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2977436607
- Cited by
- 336
- References
- 49
- FWCI
- 10.86
- Type
- journal article
- Language
- en
- Open access
- closed
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