Coaxial electrospun nanofibrous aerogels for effective removal of oils and separation of water-in-oil emulsions

Jiang, Guojun; Ge, Junyan; Jia, Yuxin; Ye, Xiangyu; Jin, Liangying; Zhang, Junrui; Zhao, Zhengping; Yang, Guofang; Xue, Lixin; Xie, Sheng

doi:10.1016/j.seppur.2021.118740

Cited by 42 publications

(13 citation statements)

References 52 publications

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“…With increasing amount of binder, the density of the aerogels increased moderately, representing 10.6, 11.3, 12.2, and 13.6 mg cm –3 for PiNFA-5, PiNFA-10, PiNFA-20, and PiNFA-40, respectively (Figure b). These are still one of the lightest polymer aerogels. ,,,,, The X-ray CT image of PiNFA (Figure S3) illustrates the three-dimensional network structure, despite the mostly invisible cell walls. Figure depicts typical scanning electron microscope (FE-SEM) images of the PiNFAs.…”

Section: Resultsmentioning

confidence: 99%

“…These are still one of the lightest polymer aerogels. 35,43,52,18,20,53 The X-ray CT image of PiNFA (Figure S3) illustrates the three-dimensional network structure, despite the mostly invisible cell walls. Figure 4 depicts typical scanning electron microscope (FE-SEM) images of the PiNFAs.…”

Section: Morphology Of Pinfasmentioning

confidence: 99%

“…However, in these PI nanofiber aerogels, mechanical strength and flexibility are not high enough for easy handling. In recent years, 3D nanofibrous structures have been synthesized using nanoscale building blocks, especially nanofibers. − Typically, nanofibers are obtained through electrospinning, which has proven to have an extraordinary advantage due to its simplicity, versatility, and cost-efficiency to fabricate micro- and nanoscale fibers with large specific surface area, high aspect ratio, and favorable mechanical properties. − One method of preparing 3D nanofibers involves fragmenting electrospun nanofibrous membranes to build blocks, followed by freeze-drying. ,, The resulting 3D structures are morphologically stable, possessing hierarchically structured pores ranging from submicrometers to hundreds of micrometers in size. − …”

Section: Introductionmentioning

confidence: 99%

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Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Thi Khuat,

Doan,

Phong Vo

et al. 2023

ACS Appl. Polym. Mater.

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Due to their low bulk density, high porosity, and functional performance, aerogels are ideal candidates for a variety of applications. However, their potential application in a variety of fields is limited by their time-consuming and costly complex fabrication process. In this study, electrospun 3-aminopropyltriethoxysilane-grafted polyimide (PI@APTES) nanofibers were used to construct nanofibrous aerogels (NFAs) via freeze-drying a dispersion of cross-linked-PI short fibers and a binder (PI@APTES), resulting in improved properties and functionalities. A highly siloxane cross-linked network structure was formed by hydrolysis and condensation reactions to generate stable nanofibrous aerogels. The obtained polyimide nanofibrous aerogels (PiNFAs) had a hierarchically three-dimensional (3D) microporous structure, high porosity (over 98%), tunable densities (10.6 ± 0.7–13.6 ± 0.2 mg cm–3), solvent resistance, superhydrophobicity (water contact angle over 163°), low thermal conductivity (as low as 33.2 mW m–1 K–1), and mechanical stability. These PiNFAs are promising candidates for potential applications in thermal insulation, lightweight construction, filtration, and sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Morphology Of Pinfasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Thi Khuat,

Doan,

Phong Vo

et al. 2023

ACS Appl. Polym. Mater.

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“…In contrast, membrane-based filtration technologies have emerged as a promising solution, offering high separation efficiency, low energy costs, environmental friendliness, and excellent selectivity . The key to successful emulsion separation lies in filtration membranes, which leverage special wettability and size-based effects. , Membrane materials can be derived from common substrates such as polymers, carbon, ceramic, metal meshes, gel, and biomass. − For instance, the Tseng group introduced superoleophilic and superhydrophobic carbon membranes designed for efficient separation of trace water-in-oil emulsions . In another study, Hou’s group developed nanofiber membranes utilizing natural loofah and poly(vinylidene fluoride) (PVDF) for gravity-driven water purification .…”

Section: Introductionmentioning

confidence: 99%

Compressible Separator and Catalyst for Simultaneous Separation and Purification of Emulsions and Aqueous Pollutants

Kim,

Jung,

Son

et al. 2023

ACS Omega

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Oily wastewater, a global environmental concern, demands efficient oil/water separation and pollutant removal. Our compressible separator and catalyst (CSC) balls, prepared through sponge etching and metal nanoparticle synthesis, exhibited efficient degradation of dyes of varying sizes, spanning a molecular weight range from 139 to 696 g/mol during the oil/water separation. Control over the distance between catalysts was achieved by incorporating Ag–Pt–Pd catalysts into the sponge skeleton and by adjusting the compression rates. The dispersion of the catalysts improved degradation efficiency for larger dyes, while concentrating the catalysts proved to be more effective for the smaller ones. By optimizing the compression rates of CSC balls, we successfully achieved the effective removal of emulsions of different sizes and precise control of flux. Our CSC ball-loaded system offers efficient and versatile solutions for concurrent separation and purification of emulsions and pollutants with potential environmental benefits.

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“…The resulting aerogels showed excellent absorption performance (55.43–127.37 g g –1 ), superior chemical stability, excellent recyclability, and outstanding separation efficiency (above 99.47 wt %). 27 , 28 These studies provide a novel approach for the design and development of efficient aerogels for oil absorption and oil–water separation. However, these reported fabrication processes of NFAs are typically complicated and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Electrospun Nanofibrous Aerogels for Efficient Oil Absorption and Emulsified Oil–Water Separation

et al. 2022

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Developing superabsorbents for efficiently separating immiscible oil–water mixtures and oil–water emulsions are highly desirable for addressing oily wastewater pollution problems, but it remains a challenge. Ultralight nanofibrous aerogels (NFAs) with unique wetting properties show great potential in oily wastewater treatment. In this study, a facile and efficient method for producing hierarchical porous structured NFAs with hydrophobicity for high efficiency oil–water separation was developed. The synthesis included three steps: wet electrospinning, freeze drying, and in situ polymerization. The obtained NFA demonstrated outstanding oil absorption capacity toward numerous oils and organic solvents, as well as efficient surfactant-stabilized water-in-oil emulsion separation with high separation flux and excellent separation efficiency. Furthermore, these NFAs displayed excellent corrosion resistance and outstanding recoverability. We assume that the resultant NFAs fabricated by this facile strategy are highly promising as ideal oil absorbents for practical oily wastewater treatment under harsh conditions.

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Coaxial electrospun nanofibrous aerogels for effective removal of oils and separation of water-in-oil emulsions

Cited by 42 publications

References 52 publications

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Cross-linked Polyimide Nanofibrous Aerogels with Hierarchical Cellular Structure for Thermal Insulation

Compressible Separator and Catalyst for Simultaneous Separation and Purification of Emulsions and Aqueous Pollutants

Facile Fabrication of Electrospun Nanofibrous Aerogels for Efficient Oil Absorption and Emulsified Oil–Water Separation

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