Embedded polyzwitterionic brush-modified nanofibrous membrane through subsurface-initiated polymerization for highly efficient and durable oil/water separation

Li, Lele; Xiang, Yangyang; Yang, Wufang; Liu, Zhilu; Cai, Meirong; Ma, Zeyu; Wei, Qiangbing; Pei, Xiaowei; Yu, Bo; Zhou, Feng

doi:10.1016/j.jcis.2020.04.117

Cited by 45 publications

(20 citation statements)

References 54 publications

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“…[16,22,23] Hydrophilic/ underwater oleophobic membrane soaking in water can absorb water molecules to form a hydrated layer, which provides a good antifouling effect. [24,25] Nanoparticles, such as titanium dioxide, silicon dioxide, and carbon nanotubes have been used to form micro/nanostructure on the surface of filter membrane, so it is of great practical significance to explore the application of other functional nanoparticles in oil-water separation of membrane technology. [26][27][28][29][30][31][32] Metal-organic framework (MOF) with a three-dimensional structure is a cutting-edge porous crystalline material made by combining metal centers and organic ligands.…”

Section: Introductionmentioning

confidence: 99%

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Zhao

et al. 2022

Macro Materials & Eng

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Membrane technology is seen as one of the useful strategies for the treatment of oily wastewater, but the membrane fouling in the process of membrane filtration seriously may affect some properties and time-consuming. Hydrophilic membrane surface can reduce membrane fouling. The appropriate design for membrane composition and surface structure can transform membrane surface with expected performance. In this work, hydrophilic polyvinylidene fluoride (PVDF) membranes with micro-nanostructure are fabricated by in situ synthesis and layer-by-layer assembly strategies. A zeolitic imidazolate framework-8 (ZIF-8) and tannic acid are used to construct microstructure and support hydrophilic groups. The water contact angle and water flux of initial PVDF membrane are 110.67°a nd 6585.7 L m −2 h −1 , respectively, while the optimally modified membrane possesses water contact of 14.5°and water flux of 13641.8 L m −2 h −1 . The modified membrane not only owns good underwater oil repellency and oil adhesion resistance but also processes good separation performance for surfactant stable oil-in-water emulsion. Furthermore, the modified membranes exhibit constant permeability and underwater oleophobicity in cycling experiments and harsh environments, indicating that the modified coating has stability against shedding of the modified materials. This method supports valuable references for MOF application in the field of oil-water separation.

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Section: Introductionmentioning

confidence: 99%

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Zhao

et al. 2022

Macro Materials & Eng

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“…Among these membrane coating approaches, direct coating is the simplest strategy, and it can be readily implemented via the common coating methods, such as spray-coating, , dip-coating, or flow-through coating. , A wide range of materials, ranging from small molecule surfactants to macromolecular polymers, can be readily applied onto the surfaces of membranes. − In addition, the coated membranes can maintain a higher flux than the corresponding pristine membranes during prolonged filtration, indicating that they exhibit excellent antifouling performance. − Nevertheless, these coatings are generally noncovalently adsorbed onto the membrane surface via secondary physical interactions, and thus, they are not stable and eventually become separated from the substrate . To improve the stability of the membrane coatings, the polymers can be grafted onto the surface of a membrane to form an antifouling layer. − Either “grafting to” or “grafting from” strategies can be employed to anchor a coating onto a substrate. ,− However, the membrane must be pretreated in order to accommodate either of these methods because adequate bonding junctions or initiating species must be present on the membrane surface to form bonds with the polymers or to extend the polymer chains . Consequently, the grafting approach is tedious and thus remains unsuitable for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Multipurpose Polyvinylidene Fluoride Membranes via a Spray-Coating Strategy Using Waterborne Polymers

Xing

Zhang

Jia

et al. 2021

ACS Appl. Mater. Interfaces

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As reported herein, the waterborne polymers poly(glycidyl methacrylate-co-poly(ethylene glycol) methyl ether methacrylate) P(GMA-co-mPEGMA) and polyethyleneimine (PEI) were used to prepare multipurpose polyvinylidene fluoride (PVDF) membranes via a direct spray-coating method. P(GMA-co-mPEGMA) and PEI were alternately sprayed onto the PVDF membrane to yield stable cross-linked copolymer coatings. The successful coating of polymers onto the membrane surface was verified by scanning electron microscopy, attenuated total reflectance-Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy characterization. The coated membrane exhibited oil rejection rates that exceeded 99.0% for oil water mixture separation and 98.0% for oil/water emulsion separation. The flux recovery ratio reached 96.7% after bovine serum albumin filtration and washing with water. The removal efficiencies of the coated membrane M3 for Congo red, methyl orange, methylene blue, and crystal violet, Pb(II), Cu(II), and Cd(II) were 82.4, 83.9, 6.3, 26.8, 90.6, 91.3, and 86.2%, respectively. Thus, it can be used for the removal of dyes and heavy metal ions from wastewater. The antibacterial activities of the coated membranes were also confirmed by the inhibition zone tests and confocal laser scanning microscopy analysis. In addition, the cross-linking strategy provides the coated membranes with excellent durability and repeatability. More importantly, the use of water as the solvent can ensure that the application of these membrane coatings proceeds via a very safe and environmentally friendly coating process.

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“…Electrospun nanofibrous membranes are excellent candidates for oil/water separation owing to their large specific surface area, high porosity, tunable pore structures, and easy access to modification. − It has been proved that the separation membranes with selective permeability to oil/water mixtures could be obtained by electrospinning of polymers, such as PAN, polyvinylidene fluoride (PVDF), cellulose acetate (CA), polystyrene (PS), poly( l -lactide) (PLLA), etc. − Specifically, PAN nanofibers have received extensive attention due to their high yield and convenient modification. − Li et al reported an electrospun oil/water separation nanofibrous membrane via graft-embedded hydrophilic poly(sulfobetaine methacrylate) brushes (PSBMA) on the PAN membrane with a high oil/water separation efficiency (>99.9%) . Ding and co-workers constructed micro-/nanostructures on the surface of the PAN membrane by electrospinning and electrospraying.…”

Section: Introductionmentioning

confidence: 99%

“…32−34 Li et al reported an electrospun oil/water separation nanofibrous membrane via graft-embedded hydrophilic poly-(sulfobetaine methacrylate) brushes (PSBMA) on the PAN membrane with a high oil/water separation efficiency (>99.9%). 35 Ding and co-workers constructed micro-/nanostructures on the surface of the PAN membrane by electrospinning and electrospraying. The permeation flux of the membrane could reach 5152 L m −2 h −1 with a separation efficiency >99.93%.…”

Section: Introductionmentioning

confidence: 99%

Superwettable Amidoximed Polyacrylonitrile-Based Nanofibrous Nonwovens for Rapid and Highly Efficient Separation of Oil/Water Emulsions

Zhou

Zhang

et al. 2021

ACS Appl. Polym. Mater.

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Considering the progressively increasing oily wastewater in the world, the development of energy-saving and environmentally friendly materials with high efficiency and feasible preparation has been of great necessity. In this approach, the amidoximated silicon dioxide/polyacrylonitrile (AO-SiO2/PAN) nanofibrous nonwovens are produced by a combination of electrospinning and electrospraying. A more-porous and higher-roughness skin layer, compared to the pristine PAN nonwovens, is achieved by optimizing the conversion ratio of the nitrile groups during amidoximation. Meanwhile, the obtained nonwovens demonstrate remarkable superhydrophilicity and underwater superoleophobicity, which contributes to its superior oil/water separation performance. With the aid of the ultralow oil adhesion, the underwater oil contact angle (UWOCA) of the nonwovens is nearly 164.1 ± 2°. A high permeation flux of 2846 ± 162 L m–2 h–1 with a separation efficiency over 95.6% for surfactant-stabilized oil-in-water emulsions is achieved under an external pressure of 20 kPa. Moreover, the superior oil resistance of the skin layer endows the modified nonwovens with cycling separation performance, which is promising for applications in the field of oil/water separation.

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Embedded polyzwitterionic brush-modified nanofibrous membrane through subsurface-initiated polymerization for highly efficient and durable oil/water separation

Cited by 45 publications

References 54 publications

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Preparation of Multipurpose Polyvinylidene Fluoride Membranes via a Spray-Coating Strategy Using Waterborne Polymers

Superwettable Amidoximed Polyacrylonitrile-Based Nanofibrous Nonwovens for Rapid and Highly Efficient Separation of Oil/Water Emulsions

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