Functionalization of Electrospun Membranes with Polyelectrolytes for Separation of Oil‐In‐Water Emulsions

Lin, Yi; Song, Chen

doi:10.1002/admi.201901285

Cited by 26 publications

(12 citation statements)

References 57 publications

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“…With a feed containing 5 wt % dodecane, the highest permeate flux we achieved was on the order of 0.1 LMH. This permeate flux is low compared to that observed with hydrophilic membranes, which is generally on the order of 10 LMH for electrospun membranes after a few hours of filtration. , However, the permeate for the LIM is the dispersed phase (oil), whereas it is the continuous phase (water) in the case of hydrophilic membranes. In order to compare the two cases, we employ the metric shown in eq where J d * is the adjusted permeate flux of the dispersed phase, J d is the measured permeate flux of the dispersed phase, and V c / V d is the volume ratio of the continuous phase to the dispersed phase in the feed.…”

Section: Resultsmentioning

confidence: 74%

“…When fouling occurs, removal of the foulants typically involves the use of harsh chemicals, which increases the overall cost of membrane operation and raises environmental concerns . Conventional methods to address fouling generally work under the principle of reducing favorable interaction between the foulant and the membrane so that the accumulation of foulants occurs more slowly (“fouling resistance”) , or the accumulated foulants can be removed more easily (“membrane regeneration”). , These techniques mitigate the effect of fouling but never completely eliminate it, so the detrimental effects of foulant removal from the membrane must still be dealt with. Therefore, we are motivated to find methods to address fouling that are fundamentally different from the conventional ones, in the hope that fouling can be eliminated completely.…”

Section: Introductionmentioning

confidence: 99%

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Electrospun Liquid-Infused Membranes for Emulsified Oil/Water Separation

Song

2022

Langmuir

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From an environmental perspective, microfiltration membranes are attractive for the separation of emulsified oils from contaminated water. However, fouling of the membrane is a major drawback of the technology. "Liquid-infused membranes" (LIMs) have the potential to eliminate membrane fouling. Here, we demonstrate the practical application of LIMs for the separation of oil from a stable oil-in-water emulsion and characterize their resistance to fouling. The base membrane is an electrospun nonwoven fibrous layer of the fluorinated copolymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP). The surface energy of the PVDF-co-HFP fibers was lowered by the covalent attachment of a fluorinated silane (PFOCTS), and then, the membrane was infused with a perfluoropolyether. The membrane was then challenged with model emulsions of dodecane in water in a cross-flow configuration. This PFOCTS-modified LIM showed better infused liquid stability, permeation selectivity, higher permeate flux than the unmodified LIM, and better anti-fouling properties than the bare membrane without infused liquid. We also examine the mechanism for transport of the dispersed oil phase through the liquid-infused membrane. We find a linear relationship between the dodecane flux and dodecane concentration in the feed and a higher dodecane flux through the PFOCTS-modified membrane than the unmodified one, which suggests that the capture of dodecane droplets from the feed plays an important role in determining the overall rate of permeation. Other factors such as lower viscosity of the infused liquid, larger pore size, and higher operating pressure also improved the permeate flux through the LIMs. Overall, this work provides some guidelines on the design of composite membranes comprising infused liquids and the choice of operating conditions for the filtration process.

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Electrospun Liquid-Infused Membranes for Emulsified Oil/Water Separation

Song

2022

Langmuir

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“…An important nanofiber application is in filtration membranes. 73 The nanofiber morphology and surface properties affect their filtration efficiency. The nanofibers have formed efficient filtration media for nanometer sized nanoparticles due to high surface cohesion and high surface area to volume ratio.…”

Section: Applications Of Electrospun Polymeric Nanocompositesmentioning

confidence: 99%

Polymeric nanocomposite via electrospinning: Assessment of morphology, physical properties and applications

Kausar

2020

Journal of Plastic Film & Sheeting

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Polymeric nanofibers have appeared as unique one-dimensional nanomaterials. Nanofibers possess exceptionally high specific surface area and essential properties. Various polymeric nanofibers and nanocomposite nanofibers have been developed using thermoplastic and thermosetting matrices and organic and inorganic nanoparticles. This review documents the worth of nanofiber technology regarding the synthesis, morphology, physical properties, and applications of the nanostructures. The nanofiber surface morphology and diameter directly influence the physical characteristics such as electrical conductivity, mechanical properties, and thermal stability. Fiber processing techniques and related parameters also affect their texture and properties. In this regard, electrospinning is frequently used to form polymeric nanofibers and nanocomposite nanofibers. Electrospun nanofibers having large surface area and excellent fiber orientation, alignment, and morphology. The polymer nanocomposites with different nanofillers (carbon nanotube, graphene, carbon nanofibers, and other nanoparticles) have been processed into high performance electrospun nanofibers. Electrospun nanomaterials have been applied in engineered structures, nanofibrous membranes, electronic devices, tissue engineering, drug delivery, antibacterial materials and other biomedical applications. Henceforth, this is a comprehensive review on physical characteristics, morphology, processing aspects, and application areas for polymeric and nanocomposite nanofibers.

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“…Membrane separation is considered as one of the most promising methods for oily wastewater treatment, especially for oil/water (O/W) emulsion separation with an oil droplets size smaller than 20 µm [16,17]. Compared with traditional methods, membrane separation has a higher oil removal efficiency, a more compact design, and a smaller footprint.…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

2021

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Membrane filtration is considered to be one of the most promising methods for oily wastewater treatment. Because of their hydrophilic surface, ceramic membranes show less fouling compared with their polymeric counterparts. Membrane fouling, however, is an inevitable phenomenon in the filtration process, leading to higher energy consumption and a shorter lifetime of the membrane. It is therefore important to improve the fouling resistance of the ceramic membranes in oily wastewater treatment. In this review, we first focus on the various methods used for ceramic membrane modification, aiming for application in oily wastewater. Then, the performance of the modified ceramic membranes is discussed and compared. We found that, besides the traditional sol-gel and dip-coating methods, atomic layer deposition is promising for ceramic membrane modification in terms of the control of layer thickness, and pore size tuning. Enhanced surface hydrophilicity and surface charge are two of the most used strategies to improve the performance of ceramic membranes for oily wastewater treatment. Nano-sized metal oxides such as TiO2, ZrO2 and Fe2O3 and graphene oxide are considered to be the potential candidates for ceramic membrane modification for flux enhancement and fouling alleviation. The passive antifouling ceramic membranes, e.g., photocatalytic and electrified ceramic membranes, have shown some potential in fouling control, oil rejection and flux enhancement, but have their limitations.

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Functionalization of Electrospun Membranes with Polyelectrolytes for Separation of Oil‐In‐Water Emulsions

Cited by 26 publications

References 57 publications

Electrospun Liquid-Infused Membranes for Emulsified Oil/Water Separation

Electrospun Liquid-Infused Membranes for Emulsified Oil/Water Separation

Polymeric nanocomposite via electrospinning: Assessment of morphology, physical properties and applications

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

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