Novel superwetting nanofibrous skins for removing stubborn soluble oil in emulsified wastewater

Li, Xiangyu; Gui, Qilin; Wei, Yen; Feng, Lin

doi:10.1039/d1ta08628f

Cited by 13 publications

(7 citation statements)

References 45 publications

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“…Separation technology based on superhydrophilic membranes is an effective method to remove oil droplets from water. Superhydrophilic membranes are composed of multiscale micro/nanostructures and multihydrated functional groups, demonstrating a high separation efficiency, particularly in the treatment of wastewater containing 0.2-to 2-μm oil droplets (8)(9)(10)(11). Previously, we developed asymmetric cross-linked polyethylene glycol (PEG)-modified polyacrylonitrile (PAN) nanofiber membranes using electrospinning technology, which showed high permeances above 2.2 × 10 4 liters m −2 hour −1 bar −1 , high flux recovery rates above 98%, and low irreversible fouling rates of ~2% (12).…”

Section: Introductionmentioning

confidence: 99%

“…Conventional polymeric membranes, such as poly(vinylidene fluoride), PAN, and polyethersulfone, have proven effective in the purification of oily wastewater as well. However, these petrochemical-based membranes are derived from fossil resources (11)(12)(13), and the membrane waste is always buried or burned, causing secondary contamination, including microplastics (13) and air pollutants (14,15). From this perspective, the entire remediation process is material-consuming and not sustainable (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Biodegradable electrospinning superhydrophilic nanofiber membranes for ultrafast oil-water separation

Cheng,

Li,

Yan

et al. 2023

Sci. Adv.

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Although membrane technology has attracted considerable attention for oily wastewater treatment, the plastic waste generated from discarded membranes presents an immediate challenge for achieving eco-friendly separation. We designed on-demand biodegradable superhydrophilic membranes composed of polylactic acid nanofibers in conjunction with polyethylene oxide hydrogels using electrospinning technology for ultrafast purification of oily water. Our results showed that the use of the polyethylene oxide hydrogels increased the number of hydrogen bonds formed between the membrane surface and water molecules by 357.6%. This converted hydrophobic membranes into superhydrophilic ones, which prevented membrane fouling and accelerated emulsion penetration through the membranes. The oil-in-water emulsion permeance of our newly designed nanofiber membranes increased by 61.9 times (2.1 × 10 4 liters per square meter per hour per bar) with separation efficiency >99.6%, which was superior to state-of-the-art membranes. Moreover, the formation of hydrogen bonds was found to accelerate polylactic acid biodegradation into lactic acid by over 30%, offering a promising approach for waste membrane treatment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biodegradable electrospinning superhydrophilic nanofiber membranes for ultrafast oil-water separation

Cheng,

Li,

Yan

et al. 2023

Sci. Adv.

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“…With the rapid economic and social development, large amounts of domestic and industrial wastewater generated are randomly discharged without treatment, which can directly affect the balance of the ecosystem and even pose a threat to human health (Cao et al 2017;Chen et al 2022;Li et al 2021a;Yang et al 2023;Zhang et al 2022c). To address this practical challenge, a wide variety of techniques have been adopted for oil/water separation, including skimmer, air flotation, in-situ burning and coagulation, with satisfactory results for immiscible oil/water mixtures (Han et al 2019;Kong et al 2023;Li et al 2021b;Zhang et al 2023) .…”

Section: Introductionmentioning

confidence: 99%

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Zhang

Teng

Zhai

et al. 2023

Preprint

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Oily wastewater poses a serious threat to the ecological environment and human health, and there is a great deal of concern about how to treat it effectively. Although there has been considerable development in recent years in the treatment of oil-water emulsions using separation membranes with special wettability, they still suffer from real problems such as complex preparation processes, material contamination, so developing an economical and environmentally friendly, high-performance membrane is a significant challenge. In this work, a wood-based membrane was easily prepared by a simple dipping process using aramid nanofiber (ANF) to modify the surface of wood. The wet ANF/wood membrane reveals higher tensile strength (1.69±0.32 MPa) than synthetic hydrogel membranes. More importantly, the membrane presents the underwater superoleophobic properties and fouling resistance under complex environmental conditions (acid, alkali, seawater, and high temperature), and effectively separate various oil-water emulsions with high separation efficiency (>99.3%) and flux (>227 L m-2 h-1). More excitingly, the membrane remains the original separation properties after 13 cycles of oil-water emulsion separation, Therefore, the inexpensive, environmentally friendly and easily prepared ANF/wood membrane is well tolerated under extreme conditions, presents excellent separation performances and provides a material basis for the treatment of actual oily wastewater.

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“…It is thus indispensable to decorate the membrane surface to endow the membranes with oil-bearing system separation and anti-fouling capacity. The universal surface modification strategies include surface coating, , surface grafting, , and so on. Among them, surface grafting introduces durable target functional groups on the membrane surface and exerts an apparent optimization implication on the origin matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PEEK-g-PAA Separation Membranes with Extraordinary Solvent Resistance for Emulsion and Organic Liquid Separation

Yang,

Sun,

et al. 2023

ACS Appl. Polym. Mater.

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Materials with remarkable chemical durability and benign separation capacity synchronously have recently attracted extensive interest for diverse purification application. Herein, a poly(ether ether ketone) (PEEK) porous membrane with excellent solvent resistance and corrosion resistance was successfully prepared by the combination of non-solvent induced phase separation (NIPS) and acid treatment. Meanwhile, for the first time, a hydrophilic poly(acrylic acid) (PAA) polymer was in situ grafted on the surface of the PEEK separation membrane by the ultraviolet grafting method, improving the membrane interface, and the membrane surface water contact angle declined from 89.31°to 20.21°. The solvent-resistant PEEK-g-PAA-2 separation membranes (the PAAgrafted membranes with best performance) could separate oil-bearing systems with high efficiency above 99.0%. Furthermore, the PAA layer endowed PEEK-g-PAA membranes with anti-fouling capacity. Benefited from the extraordinary solvent resistance of the PEEK-g-PAA-2 membranes, after immersion in chloroform for 6 h, the membranes maintained the intact morphology, exhibiting far more extraordinary solvent-resistance than commercial poly(vinylidene difluoride) (PVDF) and poly(phenylene sulfone) (PPSU) membranes. In conclusion, the PEEK-g-PAA-2 membranes could be applied in the separation of more types of oil−water and oil−oil mixtures, solving the problem that the universally reported polymer membranes have certain solubility in solvents. These features reveal the appealing development potential of the PEEK-based membranes to be utilized in the emulsion separation and organic liquid separation field.

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Novel superwetting nanofibrous skins for removing stubborn soluble oil in emulsified wastewater

Abstract: A biomimetic superwetting nanofibrous membrane is designed to eliminate both main insoluble oils and trace soluble oils during wastewater treatment.

Cited by 13 publications

References 45 publications

Biodegradable electrospinning superhydrophilic nanofiber membranes for ultrafast oil-water separation

Biodegradable electrospinning superhydrophilic nanofiber membranes for ultrafast oil-water separation

Easy preparation of wood-base membrane with fouling resistance in complex environments for efficient oil-water emulsion separation

Preparation and Properties of PEEK-g-PAA Separation Membranes with Extraordinary Solvent Resistance for Emulsion and Organic Liquid Separation

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