A review on electrospinning for membrane fabrication: Challenges and applications

https://dr.ntu.edu.sg/bitstream/10356/104282/1/Progress%20in%20electrospun%20polymeric%20nanofibrous%20membranes%20for%20water%20treatmen.pdf

Progress in electrospun polymeric nanofibrous membranes for water treatment : fabrication, modification and applications

Just as graphene triggered a new gold rush, three-dimensional graphene-based macrostructures (3D GBM) have been recognized as one of the most promising strategies for bottom-up nanotechnology and become one of the most active research fields during the last four years. In general, the basic structural features of 3D GBM, including its large surface area, which enhances the opportunity to contact pollutants, and its well-defined porous structure, which facilitates the diffusion of pollutant molecules into the 3D structure, enable 3D GBM to be an ideal material for pollutant management due to its excellent capabilities and easy recyclability. This review aims to describe the environmental applications and mechanisms of 3D GBM and provide perspective. Thus, the excellent performance of 3D GBM in environmental pollutant adsorption, transformation and detection are reviewed. Based on the structures and properties of 3D GBM, the removal mechanisms for dyes, oils, organic solvents, heavy metals, and gas pollutants are highlighted. We attempt to establish "structure-property-application" relationships for environmental pollution management using 3D GBM. Approaches involving tunable synthesis and decoration to regulate the micro-, meso-, and macro-structure and the active sites are also reviewed. The high selectivity, fast rate, convenient management, device applications and recycling utilization of 3D GBM are also emphasized.

Environmental Applications of Three-Dimensional Graphene-Based Macrostructures: Adsorption, Transformation, and Detection

Remediation of textile effluents by membrane based treatment techniques: a state of the art review.

We report a facile method for the fabrication of three-dimensional (3D) porous materials via the interaction between graphene oxide (GO) sheets and polyethylenimine (PEI) with high amine density at room temperature under atmospheric pressure without stirring. The structural and physical properties of GO–PEI porous materials (GEPMs) are investigated by scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, and nitrogen adsorption–desorption measurement and their chemical properties are analyzed by X-ray photoelectron spectroscopy, infrared spectroscopy, and Raman spectroscopy. GEPMs possess low density and hierarchical morphology with large specific surface area, and big pore volume. Furthermore, the as-prepared 3D porous materials show an excellent adsorption capacity for acidic dyes on the basis of the pore-rich and amine-rich graphene structure. GEPMs exhibit an extremely high adsorption capacity for amaranth (800 mg g–1), which are superior to other carbon materials. In addition, ...

Preparation of Three-Dimensional Graphene Oxide–Polyethylenimine Porous Materials as Dye and Gas Adsorbents

Micro-nano structure poly(ether sulfones)/poly(ethyleneimine) nanofibrous affinity membranes for adsorption of anionic dyes and heavy metal ions in aqueous solution

Poly(ethyleneimine) nanofibrous affinity membrane fabricated via one step wet-electrospinning from poly(vinyl alcohol)-doped poly(ethyleneimine) solution system and its application

A novel strategy for building a Cu 2+ sensor based on electrospun rhodamine dye doped poly(ether sulfones) (PES) nanofibers was reported. The rhodamine dye containing the spirolactam moiety acting as an electron acceptor and salicylaldehyde acting as an electron donor was doped into PES solution, and the mixture was electrospun to obtain a nanofibrous sensor usable in aqueous media for Cu 2+ . Morphology of the nanofibrous sensor was characterized by SEM, which showed that the nanofibers with a diameter of 250–600 nm formed a non-woven mat. The resultant nanofibrous sensor showed very good sensitivity toward Cu 2+ detection, and the limit of quantification (LOQ) was 1.1 × 10 −9  M. Furthermore, other metal ions showed almost no interference. The proposed sensing mechanism has been ascribed to the stabilization of the rhodamine dye after complexation with Cu 2+ and a 1:1 stoichiometry has been deduced. This reusable nanofibrous sensor can be utilized conveniently to achieve practical sensing in aqueous medium just like using a test paper. For this approach, the fluorescent probe can be replaced by other one, making this approach a widely applicable strategy for metal ion sensing.

Highly sensitive and selective Cu2+ sensor based on electrospun rhodamine dye doped poly(ether sulfones) nanofibers

Micro-Nano structure nanofibrous affinity membranes of poly(ether sulfones) (PES) blended with a functional polymer poly(ethyleneimine) (PEI) were fabricated by electrospinning technique followed by solvent etching in crosslinking solution. The surface SEM image of the water washed PES/PEI nanofibrous membrane confirmed that PEI was concentrated on the fiber surface. The nanofibrous PES/PEI membranes were crosslinked in a mixture of acetone and water with glutaraldehyde (crosslinking agent, GA), and the micro-nano structural surface of the nanofibrous membranes was created by solvent etching due to the solvation between PEI and the solvent water in the crosslinking solution during the crosslinking process. The influence of the component of the crosslinking bath on the mophology of the resulting PES/PEI nanofibers was investigated. It was found that the relatively uniform micro-nano spherules grew on the surface of the nanofibers when the content of water in crosslinking solution was more than 20 wt%, and the diameters of the spherules were in the range of 50-250 nm. The advantage of the micro-nano structrue for the heavy metal ions removal in wastwater has been demonstrated by taking a series of static adsorption experiments. It was found that the micro-nano structrue of PES/PEI nanofibrous membranes could bring high performance of adsorption capacity for heavy metal ions, indicating that the unique morphology could bring much more large surface area per unit mass and high effectivity for heavy metal ions removal from aqueous solutions.

Fabrication of micro-nano structure nanofibers by solvent etching.

The invention discloses a preparation method of a copper-plated polyethylene monofilament for fisheries and relates to a preparation method of a polyethylene monofilament capable of preventing the adhesion of organisms. According to the technical scheme, the preparation method disclosed by the invention comprises the following three process steps of: (1) carrying out melt spinning on a high-density polyethylene slice to prepare a primary monofilament; (2) carrying out high-power hot drafting on the primary monofilament to prepare a drawn filament; and (3) carrying out vacuum copper plating surface treatment on the drafted filament. The preparation method is characterized in that in the step (1), the average molecular weight of the high-density polyethylene is 120-150 thousand dalton, the spinning temperature of the polyethylene monofilament is 260-320 DEG C and the spinning speed is 10-30m/min; in the step (2), the high-power hot drafting multiple of the primary monofilament is 8-12 and the drafting temperature is 100 DEG C; and in the step (3), the surface copper plating process of the drawn filament is that the vacuum degree is (1.3*10 )-(1.3*10 ) Pa and the temperature of the heat source is 1200-1600 DEG C.

Minghua Min

Papers

Micro-nano structure poly(ether sulfones)/poly(ethyleneimine) nanofibrous affinity membranes for adsorption of anionic dyes and heavy metal ions in aqueous solution

Poly(ethyleneimine) nanofibrous affinity membrane fabricated via one step wet-electrospinning from poly(vinyl alcohol)-doped poly(ethyleneimine) solution system and its application

Highly sensitive and selective Cu2+ sensor based on electrospun rhodamine dye doped poly(ether sulfones) nanofibers

Fabrication of micro-nano structure nanofibers by solvent etching.

Preparation method of copper-plated polyethylene monofilament for fisheries