Preparation of Forcespun Amidoximated Polyacrylonitrile-graphene Oxide Nanofibers and Evaluation of Their Uranium Uptake from Aqueous Media 


Vol. 22,  No. 12, pp. 3289-3297, Dec.  2021
10.1007/s12221-021-0133-8


  Abstract

In this study, a handmade forcespinning device was developed to prepare polyacrylonitrile (PAN) and polyacrylonitrile-graphene oxide (PAN-GO) nanofibers. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to investigate the morphology and characterization of the nanofibers. Modified PANGO( 0.2 %) nanofibers were obtained by reducing nitrile groups to amidoxime and then applied to uptake uranium ions from aqueous media. The maximum adsorption obtained for the adsorbent was 345.084 mg g-1, which was obtained under optimal conditions of pH=5, contact time of 90 minutes and initial concentration of 25 mg L-1. Also, the adsorption data were evaluated using Langmuir, Freundlich, Dubin and S-shaped isotherms. The results introduced the S-shaped isotherm model with a regression coefficient (R2) of 0.999 as a suitable model. In addition, kinetic studies represented that uranium adsorption for less than 45 min fits well with the pseudo-second-order model (R2=0.979). At times longer than 45 min, the nanofibers follow the S-shaped kinetics (R2=0.999). Eventually, negative G (Gibbs free energy change) represents spontaneous adsorption of uranium ions by PAN-GO(0.2 %). The selectivity of PAN-GO nanofibers for the adsorption of competing ions was in accordance with the order Fe(II) < Ni(II) < CO(II) < U(VI) < V(V).

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  Cite this article

[IEEE Style]

F. A. a. M. Firouzzare, "Preparation of Forcespun Amidoximated Polyacrylonitrile-graphene Oxide Nanofibers and Evaluation of Their Uranium Uptake from Aqueous Media," Fibers and Polymers, vol. 22, no. 12, pp. 3289-3297, 2021. DOI: 10.1007/s12221-021-0133-8.

[ACM Style]

Fatemeh Ashrafi and Mahmoud Firouzzare. 2021. Preparation of Forcespun Amidoximated Polyacrylonitrile-graphene Oxide Nanofibers and Evaluation of Their Uranium Uptake from Aqueous Media. Fibers and Polymers, 22, 12, (2021), 3289-3297. DOI: 10.1007/s12221-021-0133-8.

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