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Ion-imprinted electrospun nanofibers of chitosan/1-butyl-3-methylimidazolium tetrafluoroborate for the dynamic expulsion of thorium (IV) ions from mimicked effluents

Abstract

The present study explores the innocuous, biocompatible, and extremely competent molecularly imprinted chitosan/RTIL electrospun nanofibers having average diameter of 30 nm for the expulsion of thorium (IV) ions from the mimicked effluent waste. The extended Flory–Huggins theory and three-dimensional molecular modeling have been effectively premeditated via Materials Studio software for enumerating the inter-miscibility and compatibility (Chi parameter (χ) = 1.019, mixing energy (Emix) = 0.603 kcal/mol) of the chitosan/RTIL (1-butyl-3-methylimidazolium tetrafluoroborate). The maximum adsorption efficiency is found to be 90% at a neutral pH of 7, and a temperature of 298 K within 120 min. The adsorption process was extensively studied by two-parameter adsorption isotherms like Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) and three-parameter models like Redlich–Paterson and Sips isotherm. Pseudo-second-order kinetics model (R2 = 0.982) and Langmuir isotherm (R2 = 0.994) bestowed the best fitting on chitosan/RTIL nanofibers for the adsorption of Th (IV) ions. The thermodynamic study reveals the spontaneity and exothermic nature of the reaction. The experimental analysis conjoint with isotherm and kinetic models, and simulation study establish the applicability of chitosan/RTIL nanofibers for the expulsion of Th (IV) and other toxic metal ions from the effluents.

Ion-imprinted electrospun nanofiber for expulsion of thorium (IV) ion

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Acknowledgments

The authors are thankful to Dr. Surendra Pal, Vice-Chancellor, DIAT-DU, for the continuous support, and DRDO-DIAT Program on Nanomaterials for the financial support. The authors would also like to thank Dr. T. Mukundan (NPOL, DRDO Cochin) for the support of Materials Studio software, and Mr. Dhananjay Gunjal for the technical help with morphological characterizations. The authors would also like to thank Mr. Ramdayal, Deakin University, Australia, for his technical support.

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Correspondence to Balasubramanian Kandasubramanian.

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Responsible editor: Georg Steinhauser

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Gore, P.M., Khurana, L., Siddique, S. et al. Ion-imprinted electrospun nanofibers of chitosan/1-butyl-3-methylimidazolium tetrafluoroborate for the dynamic expulsion of thorium (IV) ions from mimicked effluents. Environ Sci Pollut Res 25, 3320–3334 (2018). https://doi.org/10.1007/s11356-017-0618-6

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Keywords

  • Electrospinning
  • Ionic-liquid (RTIL)
  • Adsorption
  • Thorium (IV)
  • Effluents