Fabrication of a Porous Polyacrylonitrile Nanofiber Adsorbent for Removing Radioactive 60co
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A Co ion adsorbent was prepared using electrospun porous polyacrylonitrile (PAN) nanofibers, featuring easy recovery for reuse compared with a nanoparticle-based adsorbent. As an efficient ligand for Co ions, ethylenediaminetetraacetic acid (EDTA) was introduced on the surface of porous PAN nanofibers with the aid of a branched polyethyleneimine (PEI) linker to obtain an adsorbent with carboxylic acid groups. On the adsorbent surface, the carboxylic acid from EDTA could adsorb Co ions via ion exchange and amine groups from PEI that remained after EDTA functionalization played a role in coordinating Co ions. The amine and carboxylic acid groups were simultaneously involved in the adsorption on the surface, making it possible to remove Co ions over a wide pH range. An investigation of the adsorption isotherms and kinetics of the nanofibrous adsorbent indicated that monolayer chemisorption was achieved with a maximum Co ion adsorption capacity of 8.32 mg/g. In addition, radioactive 60Co was efficiently removed by the adsorbent with a removal extent of more than 98%. Considering the easy separation from Co ion solution and regeneration of the nanofibrous adsorbent and its availability in a wide pH range, the adsorbent has great advantages in practical applications.Keywords:
Polyacrylonitrile
In electrospinning, the structure of nanofibers, which is affected by polymer solution parameters and processing conditions, influences the physical characteristics of nanofiber mats. In this study, under optimum conditions of electrospinning, the concentration of polyacrylonitrile (PAN) was changed 14, 16 and 18 wt %, and its effects on the nanofiber diameter and pore size of nanofiber mats were studied. The results showed that increasing the PAN polymer concentration enhanced the nanofiber diameter and pore diameter of nanofiber mats. Keywords: electrospinning; concentrations; pore size
Polyacrylonitrile
Electrospinning
Filtration (mathematics)
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Polyacrylonitrile nanofibers were fabricated by co-electrospinning technique and were characterized using scanning electron microscopy(SEM). We have evaluated systematically the effects of the important processing parameters affected on the morphology of the formed fibers; voltage, solution concentration and tip to collector distance. PAN nanofibers of about 200 nm${\sim}$ 2500 nm in diameter were well fabricated at the polymer concentration of 7.5 wt%${\sim}$ 15 wt%. It has been found that the average diameter of PAN nanofibers increased with increasing the concentration of PAN solution due to the reduction of whipping and splitting for the high viscosity solution. we also found an evidence that the applied voltage is strongly correlated with the distribution of nanofibers and the uniformed size of nanofibers were obtained at electrostatic value of 1 kV/cm.
Polyacrylonitrile
Electrospinning
Morphology
Characterization
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Polyacrylonitrile
Electrospinning
Filtration (mathematics)
Thermal Stability
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Polyacrylonitrile(PAN) nanofibers are prepared by electrospinning,the effects of technics parameters such as solution concentration,applied voltage and the extrsion rate on preparation and morphology of electrospun fibers are investigated,and then electrospinning is employed to coat PAN nanofibers on filaments.The Results show that the PAN solution concentration and the folw rate have a profound effect on nanofiber diameter,the higher solution concentration is,the greater the possibility of electrospinning is,the low flow rate can electrospin well-proportioned nanofibers,the diameter is tended to decrease with the increase of applied voltage.Nanofibers can tightly coat the filaments.And this offeres a new method and technology for the application of nanofiber,modification of filaments and the interface design of fibers enforced composites.
Polyacrylonitrile
Electrospinning
Morphology
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Polyacrylonitrile
Electrospinning
Characterization
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Continuous and long polyacrylonitrile (PAN) nanofibers in the form of a non-woven fabric were made by electrospinning by using homo-PAN dissolved in dimethylformamide. The nanofibers were thermally stabilized and carbonized under several conditions and carbon nanofibers were obtained. Thermal stabilization of the PAN nanofibers was completed in ten minutes. The structural density of the thermally stabilized nanofibers depended on the stabilization conditions, and was an indication of their small size.
Polyacrylonitrile
Electrospinning
Thermal Stability
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Modified polyacrylonitrile(PAN) nanofiber is prepared through reaction of hydroxylamine on PAN nanofiber prepared by electrospinning and nitrile group changed into amid-oxime group.The adsorptivity of modified PAN nanofibers on lead ion is investigated.The result shows that the modified PAN nanofibers exhibite high adsorptivity on lead ion.
Polyacrylonitrile
Hydroxylamine
Electrospinning
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The study investigates the effect of solution concentration on the morphology of polyacrylonitrile (PAN) nanofibers. PAN electrospun nanofibers are produced from PAN/DMF solutions at six different concentrations (6%-16%). The morphology of the nanofibers is analyzed by scanning electron microscope. The experimental results show that the fiber diameter increases and the bead formation decreases as the concentration increases. On the other hand, the nanofiber diameter becomes finer but less uniform as the concentration decreases.
Polyacrylonitrile
Morphology
Electrospinning
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Polyacrylonitrile
Electrospinning
Mass fraction
Morphology
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One dimension(1D) nanofibers has been attracted by lots of scientists because of its unique photonic、electrical and magnetic properties.In this paper,three different kinds of instrument were used to produce 1D nanofibers by electrospinning polyacrylonitrile(PAN) with a concentration of 12%.Results of SEM showed that the instrument of two coppers needlepoint with constant gap exhibited the best uniaxially aligned arrays fiber.
Polyacrylonitrile
Electrospinning
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