Hierarchically porous electrospun nanofibrous mats produced from intrinsically microporous fluorinated polyimide for the removal of oils and non-polar solvents

Topuz, Fuat; Abdulhamid, Mahmoud A.; Nunes, Suzana Pereira; Székely, György

doi:10.1039/d0en00084a

Cited by 52 publications

(36 citation statements)

References 32 publications

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“…Good solubility of the PI resins in the organic solvents made it possible to fabricate the NFMs via a one-step electrospinning procedure, as shown in Figure 4 b. PI-1 and PI-2 NFMs were successfully prepared using the common electrospinning conditions established in our previous work for the organo-soluble PI systems [ 33 ] and the 6FDA-based PI systems reported in the literatures [ 34 , 35 , 36 , 37 ]. The chemical structures of the PI NFMs were investigated by AFR-FTIR and 1 H-NMR measurements, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

et al. 2021

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The rapid development of advanced high-frequency mobile communication techniques has advanced urgent requirements for polymer materials with high-temperature resistance and good dielectric properties, including low dielectric constants (low-Dk) and low dielectric dissipation factors (low-Df). The relatively poor dielectric properties of common polymer candidates, such as standard polyimides (PIs) greatly limited their application in high-frequency areas. In the current work, benzoxazole units were successfully incorporated into the molecular structures of the fluoro-containing PIs to afford the poly(imide-benzoxazole) (PIBO) nano-fibrous membranes (NFMs) via electrospinning fabrication. First, the PI NFMs were prepared by the electrospinning procedure from organo-soluble PI resins derived from 2,2’-bis(3,4-dicarboxy-phenyl)hexafluoropropane dianhydride (6FDA) and aromatic diamines containing ortho-hydroxy-substituted benzamide units, including 2,2-bis[3-(4-aminobenzamide)-4-hydroxylphenyl]hexafluoropropane (p6FAHP) and 2,2-bis[3-(3-aminobenzamide)-4-hydroxyphenyl]hexafluoropropane (m6FAHP). Then, the PI NFMs were thermally dehydrated at 350 °C in nitrogen to afford the PIBO NFMs. The average fiber diameters (dav) for the PIBO NFMs were 1225 nm for PIBO-1 derived from PI-1 (6FDA-p6FAHP) precursor and 816 nm for PIBO-2 derived from PI-2 (6FDA-m6FAHP). The derived PIBO NFMs showed good thermal stability with the glass transition temperatures (Tgs) over 310 °C and the 5% weight loss temperatures (T5%) higher than 500 °C in nitrogen. The PIBO NFMs showed low dielectric features with the Dk value of 1.64 for PIBO-1 and 1.82 for PIBO-2 at the frequency of 1 MHz, respectively. The Df values were in the range of 0.010~0.018 for the PIBO NFMs.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

et al. 2021

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“…There are other examples where this combination of properties has been used to engineer materials for oil/water separation (Zhu et al, 2017 ; Ge et al, 2019 , 2020a ). A variety of nanomaterials have been used to create meshes (Jiang et al, 2017 ; Zhang et al, 2018a , 2019 ; Nanda et al, 2019 ; Wang et al, 2019 ; Gong et al, 2020 ), membranes (Attia et al, 2018 ; Huang et al, 2018 ; Ma et al, 2018 ; Qing et al, 2018 ; Zhao et al, 2018 ; Subramanian et al, 2019 ; Cheng et al, 2020 ), sponges (Huang et al, 2019b ; Li et al, 2019b ), and fabrics (Cheng et al, 2018 ; Chauhan et al, 2019 ; Lin et al, 2019 ; Zhou et al, 2019 ; Dan et al, 2020 ) with superhydrophobic and superoleophilic properties for oil/water separation (Ferrero et al, 2019 ; Zulfiqar et al, 2019 ; Latthe et al, 2020 ; Lin et al, 2020 ; Topuz et al, 2020 ; Zhang et al, 2020b ). Most of these materials separate oil either by filtration, absorption, or both.…”

Section: Separation Of Oil/water Mixturesmentioning

confidence: 99%

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

et al. 2020

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Oil/water mixtures are a potentially major source of environmental pollution if efficient separation technology is not employed during processing. A large volume of oil/water mixtures is produced via many manufacturing operations in food, petrochemical, mining, and metal industries and can be exposed to water sources on a regular basis. To date, several techniques are used in practice to deal with industrial oil/water mixtures and oil spills such as in situ burning of oil, bioremediation, and solidifiers, which change the physical shape of oil as a result of chemical interaction. Physical separation of oil/water mixtures is in industrial practice; however, the existing technologies to do so often require either dissipation of large amounts of energy (such as in cyclones and hydrocyclones) or large residence times or inventories of fluids (such as in decanters). Recently, materials with selective wettability have gained attention for application in separation of oil/water mixtures and surfactant stabilized emulsions. For example, a superhydrophobic material is selectively wettable toward oil while having a poor affinity for the aqueous phase; therefore, a superhydrophobic porous material can easily adsorb the oil while completely rejecting the water from an oil/water mixture, thus physically separating the two components. The ease of separation, low cost, and low-energy requirements are some of the other advantages offered by these materials over existing practices of oil/water separation. The present review aims to focus on the surface engineering aspects to achieve selectively wettability in materials and its their relationship with the separation of oil/water mixtures with particular focus on emulsions, on factors contributing to their stability, and on how wettability can be helpful in their separation. Finally, the challenges in application of superwettable materials will be highlighted, and potential solutions to improve the application of these materials will be put forward.

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“…Many natural sorbents, like sawdust [ 5 ], wool fiber [ 6 ], and zeolite [ 7 ], have been investigated, but the main limitations are represented by the low oil selectivity for oil/water systems and very limited recyclability. A porous polymeric composite is considered as an effective adsorption material because it is easy to prepare and to recycle, it has a satisfactory adsorption capacity and a good oil selectivity after opportune tuning of hydrophobic and hydrophilic chemical structure of the surface [ 8 , 9 , 10 , 11 ]. To date, several polymer grades have been employed as oil adsorbents, such as foams [ 12 , 13 ], resins [ 14 , 15 , 16 , 17 ], sponges [ 18 ], and aerogels [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Polyurethane Foams Loaded with Carbon Nanofibers for Oil Spill Recovery: Mechanical Properties under Fatigue Conditions and Selective Absorption in Oil/Water Mixtures

et al. 2021

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Marine pollution due to spillage of hydrocarbons represents a well-known current environmental problem. In order to recover the otherwise wasted oils and to prevent pollution damage, polyurethane foams are considered suitable materials for their ability to separate oils from sea-water and for their reusability. In this work we studied polyurethane foams filled with carbon nanofibers, in varying amounts, aimed at enhancing the selectivity of the material towards the oils and at improving the mechanical durability of the foam. Polyurethane-based foams were experimentally characterized by morphological, surface, and mechanical analyses (optical microscopy observation, contact angle measurement, absorption test according to ASTM F726-99 standard and compression fatigue tests according to ISO 24999 standard). Results indicated an increase in hydrophobic behavior and a good oleophilic character of the composite sponges besides an improved selective absorption of the foam toward oils in mixed water/oil media. The optimal filler amount was found to be around 1 wt% for the homogeneous distribution inside the polymeric foam. Finally, the fatigue test results showed an improvement of the mechanical properties of the foam with the growing carbon filler amount.

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Hierarchically porous electrospun nanofibrous mats produced from intrinsically microporous fluorinated polyimide for the removal of oils and non-polar solvents

Abstract: An electrospun nanofibrous adsorbent with micro-, meso- and macropores and surface area of 565 m2 g−1 was developed for the rapid removal of crude oil from seawater.

Cited by 52 publications

References 32 publications

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

Preparation and Characterization of Electrospun Fluoro-Containing Poly(imide-benzoxazole) Nano-Fibrous Membranes with Low Dielectric Constants and High Thermal Stability

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

Polyurethane Foams Loaded with Carbon Nanofibers for Oil Spill Recovery: Mechanical Properties under Fatigue Conditions and Selective Absorption in Oil/Water Mixtures

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