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标题:A novel modified graphene oxide/chitosan composite used as an adsorbent for Cr(VI) in aqueous solutions.
时间:2020-01-14 21:10:21
DOI:10.1016/j.ijbiomac.2016.03.027
PMID:26993532
作者:Li Zhang;Hanjin Luo;Peipei Liu
关键词:Chitosan;Graphene oxide;Modification;Adsorption;Cr(VI
出版源: 《International Journal of Biological Macromolec... ,2016 ,87 :586-596
摘要:A novel adsorbent for removal of hexavalent chromium (Cr(VI)) from aqueous solutions has been successfully prepared by modifying graphene oxide/chitosan composite with disodium ethylenediaminetetraacetate (EDTA-2Na) (GEC). This modified composite was characterized by various technologies; including scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Batch adsorption experiments were carried out to evaluate the adsorption of Cr(VI) by GEC under different conditions. The results indicate that the adsorption of Cr(VI) on GEC was highly pH-dependent, with the highest adsorption capacity (86.17mg/g) occurring at pH 2. The kinetics of adsorption exhibited pseudo-second-order behavior. The adsorption data were well described by the Freundlich isotherm model. The adsorption capacity increased with increasing temperature. The calculated thermodynamic parameters indicate that the adsorption is a spontaneous, endothermic and feasible process. The further regeneration experiments showed the adsorption capacity of GEC for Cr(VI) decreased 5% after 7 times reuse, indicating the potential of the as-prepared material for practical application.
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目录:
  • A novel modified graphene oxide/chitosan composite used as an adsorbent for Cr(VI) in aqueous solutions
    • 1 Introduction
    • 2 Materials and methods
      • 2.1 Materials
      • 2.2 Preparation of graphene oxide (GO) suspension
      • 2.3 Preparation of GC and GEC
      • 2.4 Characterization of the prepared materials
      • 2.5 Adsorption of Cr(VI) experiments
      • 2.6 Determination of Cr(VI) concentration
      • 2.7 Recyclability of GEC experiments
    • 3 Results and discussion
      • 3.1 Characterization of materials
      • 3.2 Effect of contact time
      • 3.3 Effect of initial pH
      • 3.4 Effect of adsorbent dosage
      • 3.5 Adsorption kinetics study
      • 3.6 Adsorption isotherm and thermodynamic study
    • 4 Mechanism of Cr(VI) adsorption onto GEC
    • 5 Regeneration of adsorbent
    • 6 Conclusions
    • Acknowlegements
    • References

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