Polypyrrole deposited electrospun PAN/PEI nanofiber membrane designed for high efficient adsorption of chromium ions (VI) in aqueous solution
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Polyacrylonitrile
Polypyrrole
Electrospinning
Specific surface area
Environmental Pollution
Polyacrylonitrile
Polypyrrole
Electrospinning
Specific surface area
Environmental Pollution
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Carbon materials have the advantages of good electrical conductivity and excellent chemical stability, so many carbon materials have been introduced as electrodes for the capacitive deionization (CDI) process. Due to the low surface area compared to the other nanocarbonaceous materials, CNFs performance as electrode in the CDI units is comparatively low. This problem has been overcome by preparing high surface area carbon nanofibers and by creating numerous long pores on the nanofibers surface. The modified CNFs have been synthesized using low cost, high yield and facile method; electrospinning technique. Stabilization and graphitization of electrospun nanofiber mats composed of polyacrylonitrile (PAN) and poly (methyl methacrylate) (PMMA) leads form longitudinal pores CNFs. The utilized characterizations indicated that the CNFs obtained from electrospun solution having 50% PMMA have surface area of 181 m2/g which are more than the conventional CNFs. Accordingly, these nanofibers revealed salt removal efficiency of ~90% and specific capacitance of 237 F/g.
Capacitive Deionization
Polyacrylonitrile
Electrospinning
Specific surface area
Carbon fibers
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Electrospinning
Specific surface area
Polyacrylonitrile
Thermal Stability
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In this paper, patterned nanofibrous membranes were fabricated for air filtration. Polyacrylonitrile was employed as the electrospinning material as its fluffy property and bulged bubble template served as collector to prepare the patterned membrane. With this special structure, the pressure drop significantly declined from 151.7 to 24.7 mmH 2 O, although the filtration efficiency of nanofiber membranes exhibited a slight decline from 99.94% to 96.33% compared to traditional electrospinning nanofibrous membranes. These sharp declines of the pressure drop while retaining the filtration efficiency imply that it could have more extensive applications.
Polyacrylonitrile
Electrospinning
Filtration (mathematics)
Air filtration
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Polyacrylonitrile
Electrospinning
Specific surface area
Corncob
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Polyacrylonitrile
Electrospinning
Separator (oil production)
Phase inversion
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Nanofibers membrane are potential material for water filtration, and surface properties of the membrane are an important factor to avoid fouling on the membrane surface. The combination of filter material is known to influence the membrane surface properties. We investigated the mixture of polyacrylonitrile (PAN) and cellulose acetate (CA) on the nanofiber membrane by electrospinning. This blend was dissolved in dimethylformamide as feed polymer in electrospinning technique. We prepared the ratio of PAN to CA were 0:10, 4:6, 5:5, 6:4, and 10:0 in 8 wt%. All the membranes formed fiber, except 0:10 which only created a thin layer from the sprays. Contact angle measurements related to membrane surface properties were measured and resulted in 128 o , 126 o , and 125 o for 4:6, 5:5 dan 6:4 membranes, respectively. This results indicated that all PAN/CA membranes had hydrophobic properties. The hydrophobic property was also observed by Fourier transform infrared (FTIR) spectroscopy, a sharp peak of-CH 3 appeared. It is interesting while mixing two hydrophilic polymers we obtain a hydrophobic membrane.
Polyacrylonitrile
Electrospinning
Cellulose acetate
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In this study, we systematically investigated the flux performance of ultrafiltration (UF) membranes functionalized with randomly accumulated nanofibers. By electrospinning nanofibers from hydrophobic polysulfone (PSf) and hydrophilic cellulose (CL), we were able to explore the role that the bulk nanofiber (NF) layer thickness, individual NF diameter, and intrinsic chemistry play in composite membrane flux. Additional parameters that we systematically tested include the molecular weight cut-off (MWCO) of the base membrane (10, 100, and 200 kDa), flow orientation (cross-flow versus dead-end), and the feed solution (hydrophilic water versus hydrophobic oil). Structurally, the crosslinked PSf nanofibers were more robust than the CL nanofibers, which lead to the PSfNF-UF membranes having a greater flux performance. To decouple the structural robustness from the water affinity of the fibers, we chemically modified the PSf fibers to be hydrophilic and, indeed, the flux of these new composite membranes featuring hydrophilic crosslinked nanofibers was superior. In summary, the greatest increase in flux performance arises from the smallest diameter, hydrophilic nanofibers that are mechanically robust (crosslinked). We have demonstrated that electrospun nanofibers improve the flux performance of ultrafiltration membranes.
Polysulfone
Ultrafiltration (renal)
Electrospinning
Polyacrylonitrile
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Polyacrylonitrile
Electrospinning
Cellulose acetate
Thermogravimetric analysis
Filtration (mathematics)
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Electrospinning
Polyacrylonitrile
Filtration (mathematics)
Separation process
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