Aramid nanofiber aerogel membrane extract from waste plastic for efficient separation of surfactant-stabilized oil-in-water emulsions

Gan, Liping; Qiu, Fengxian; Yue, Xuejie; Chen, Yu; Xu, Jicheng; Zhang, Tao

doi:10.1016/j.jece.2021.106137

Cited by 31 publications

(8 citation statements)

References 31 publications

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“…As shown in Figure 9c, after three cycles of filtration, the membrane permeability could be maintained at 8.3 L m −2 h −1 bar −1 with a MB rejection 98.1%. A three-dimensional porous aerogel membrane derived from waste Kevlar fibre was reported for surfactant stabilized oil-in-water emulsions separation [164]. The hydrogel was obtained by dissolving the aramid fibre in the mixture of potassium hydroxide (KOH)/DMSO to allow exfoliation of the fibre to form nanosized fibre, as depicted in Figure 9d, followed by solvent exchange to form crosslinked networks.…”

Section: Polymers and Plasticsmentioning

confidence: 99%

Waste Reutilization in Polymeric Membrane Fabrication: A New Direction in Membranes for Separation

2021

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In parallel to the rapid growth in economic and social activities, there has been an undesirable increase in environmental degradation due to the massively produced and disposed waste. The need to manage waste in a more innovative manner has become an urgent matter. In response to the call for circular economy, some solid wastes can offer plenty of opportunities to be reutilized as raw materials for the fabrication of functional, high-value products. In the context of solid waste-derived polymeric membrane development, this strategy can pave a way to reduce the consumption of conventional feedstock for the production of synthetic polymers and simultaneously to dampen the negative environmental impacts resulting from the improper management of these solid wastes. The review aims to offer a platform for overviewing the potentials of reutilizing solid waste in liquid separation membrane fabrication by covering the important aspects, including waste pretreatment and raw material extraction, membrane fabrication and characterizations, as well as the separation performance evaluation of the resultant membranes. Three major types of waste-derived polymeric raw materials, namely keratin, cellulose, and plastics, are discussed based on the waste origins, limitations in the waste processing, and their conversion into polymeric membranes. With the promising material properties and viability of processing facilities, recycling and reutilization of waste resources for membrane fabrication are deemed to be a promising strategy that can bring about huge benefits in multiple ways, especially to make a step closer to sustainable and green membrane production.

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Section: Polymers and Plasticsmentioning

confidence: 99%

Waste Reutilization in Polymeric Membrane Fabrication: A New Direction in Membranes for Separation

2021

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“…The oil–water emulsion formed by industrial production and daily life activities will cause serious environmental pollution and waste of resources. In addition, the moisture in the fuel will corrode the internal components of engines and cause carbon accumulation on the fuel injector and cylinder, greatly reducing the service life of the engine. , Therefore, oil–water separation technology has been developed to improve fuel quality and recycle water-containing oil resources. − Common oil–water separation technologies include chemical (coagulation and dispersion), biological (biodegradation), and physical methods (flotation, centrifugal separation, and membrane separation). − In particular, membrane separation has attracted increasing attention owing to its low energy consumption, nonsecondary pollution, high efficiency, and wide applicability …”

Section: Introductionmentioning

confidence: 99%

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Han,

Yu,

Chen

et al. 2024

ACS Appl. Nano Mater.

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Electrospun nanofiber membranes exhibit efficient oil−water separation performance, owing to their fine and controllable fiber diameters. However, the three-dimensional dense stacking of nanofibers leads to low porosity, decreasing the oil flux in oil−water separation. Here, a composite nanofiber membrane with a dual-scale structure was designed to achieve a high oil−water separation efficiency and high oil flux simultaneously. In detail, a dense polyurethane/fluorinated polyurethanes (PAN-FPU) nanofiber layer with a fine fiber diameter (150 nm) and a small pore size (3−4 μm) was combined with a fluffy polysulfone (PSF) nanofiber layer with a coarse diameter (1200 nm) and a large pore size (8−9 μm). Using the PAN-FPU nanofiber layer as the inlet layer, modular electrospinning equipment was used to prepare dual-scale nanofiber membranes with a high oil−water separation efficiency and high flux in one step. When the fiber ratio of PAN-FPU/PSF was 1:2, the resulting composite nanofiber film could achieve a separation efficiency of 99.58% and an oil flux of 4630 L m −2 h −1 for an oil−water mixture. For a water-in-oil emulsion, the separation efficiency and oil flux reached 99.37% and 1124 L m −2 h −1 , respectively. In addition, the separation efficiency and flux of the biscale nanofiber membrane were simulated by establishing a fluid model, and the simulation results confirmed that the fiber membrane had excellent separation performance. Dual-scale composite nanofiber membranes have potential applications in the field of oily wastewater treatment and locomotive filters compared with monolayer membranes.

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“…Multiple investigations have documented the successful utilization of plastic waste as sorbents and membranes for oil–water separation 40 – 45 . Separators for oil–water emulsions have been fabricated using: PET waste via electrostatic spinning, in-situ deposition and surface modification 46 , Biomimetic fabrication of PET waste via electrospinning with enhanced stability and demulsibility 47 , kelvar fiber waste via combining solvent replacement and freeze-drying route 48 , and PE waste via swelling, solvent extraction and freeze-drying 20 . As these examples demonstrate, plastic waste is a viable feedstock for oil sorbent production.…”

Section: Introductionmentioning

confidence: 99%

Designing super-fast trimodal sponges using recycled polypropylene for organics cleanup

Saleem,

Moghal,

McKay

2023

Sci Rep

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Sorbent pads and films have been commonly used for environmental remediation purposes, but designing their internal structure to optimize access to the entire volume while ensuring cost-effectiveness, ease of fabrication, sufficient strength, and reusability remains challenging. Herein, we report a trimodal sorbent film from recycled polypropylene (PP) with micropores, macro-voids, and sponge-like 3D cavities, developed through selective dissolution, thermally induced phase separation, and annealing. The sorbent has hundreds of cavities per cm2 that are capable of swelling up to twenty-five times its thickness, allowing for super-fast saturation kinetics (within 30 s) and maximum oil sorption (97 g/g). The sorption mechanism follows a pseudo-second-order kinetic model. Moreover, the sorbent is easily compressible, and its structure is retained during oil sorption, desorption, and resorption, resulting in 96.5% reuse efficiency. The oil recovery process involves manually squeezing the film, making the cleanup process efficient with no chemical treatment required. The sorbent film possesses high porosity for effective sorption with sufficient tensile strength for practical applications. Our integrated technique results in a strengthened porous polymeric structure that can be tailored according to end-use applications. This study provides a sustainable solution for waste management that offers versatility in its functionality.

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Aramid nanofiber aerogel membrane extract from waste plastic for efficient separation of surfactant-stabilized oil-in-water emulsions

Cited by 31 publications

References 31 publications

Waste Reutilization in Polymeric Membrane Fabrication: A New Direction in Membranes for Separation

Waste Reutilization in Polymeric Membrane Fabrication: A New Direction in Membranes for Separation

Electrospun Polyacrylonitrile-Fluorinated Polyurethane/Polysulfone Nanofiber Membranes for Oil–Water Separation

Designing super-fast trimodal sponges using recycled polypropylene for organics cleanup

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