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Highly-Efficient Capture of Chromium (Vi) Ions on Electrospun Polyacrylonitrile/Diaminoglyoxime Nanofiber: Thermal Stability, Decomposition Kinetics and Tensile Strength Publisher



Zandavar H1 ; Pourmortazavi SM1 ; Mirsadeghi S2
Authors
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Authors Affiliations
  1. 1. Faculty of Chemistry and Chemical Engineering, Malek Ashtar University of Technology, Tehran, Iran
  2. 2. Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, 1411713137, Iran

Source: Journal of Materials Research and Technology Published:2021


Abstract

In this study, a new polyacrylonitrile/diaminoglyoxime-based nanofiber was developed using electrospinning thanks to their outstanding chemical-mechanical properties used as effective adsorbents for the Cr(VI) removal without any secondary pollution. However, thermal stability and degradation of these nonpolymeric-mats could limit their application. The electrospun polyacrylonitrile with different percentages of diaminoglyoxime (%) nanofibers have their average diameters between 70 and 85 nm. The DSC technique was used to characterize the thermal stability of the manufactured polyacrylonitrile/diaminoglyoxime nanofiber. Decomposition kinetic parameters of the mats via the non-isothermal approaches and thermodynamic parameters (ΔG#, ΔH# and ΔS#) were determined. Polyacrylonitrile/diaminoglyoxime(30%) reached maximum adsorption capacity of 348.7 mg g−1 for Cr(VI) ions. After conducting the adsorption–desorption test for 20 times, polyacrylonitrile/diaminoglyoxime(30%) nanofiber exhibited excellent regeneration and stable desorption efficiency of over 73%. Compared with complicated industrial-sized chemicals for adsorbing Cr(VI), the nanofiber mat proposed herein is a simple one-step electrospinning process, which is extremely successful for industrial applications, cheap and without harmful by-products. Polyacrylonitrile/diaminoglyoxime (30%) was proposed as an appropriate material to adsorb Cr(VI) ions. © 2021 The Author(s)
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