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Synergistic effect of iron doped ordered mesoporous carbon on adsorption-coupled reduction of hexavalent chromium and the relative mechanism study

Tang, Lin ; Yang, Gui-De ; Zeng, Guang-Ming ; Cai, Ye ; Li, Si-Si ; Zhou, Yao-Yu ; Pang, Ya ; Liu, Yuan-Yuan ; Zhang, Yi ; Luna, Brandon

Chemical engineering journal (Lausanne, Switzerland : 1996), 2014-03, Vol.239, p.114-122 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Synergistic effect of iron doped ordered mesoporous carbon on adsorption-coupled reduction of hexavalent chromium and the relative mechanism study
  • Autor: Tang, Lin ; Yang, Gui-De ; Zeng, Guang-Ming ; Cai, Ye ; Li, Si-Si ; Zhou, Yao-Yu ; Pang, Ya ; Liu, Yuan-Yuan ; Zhang, Yi ; Luna, Brandon
  • Assuntos: Adsorption ; Carbon ; Hexavalent chromium ; Iron ; Iron doped ordered mesoporous carbon ; Magnetic properties ; Magnetic separation ; Mathematical models ; Nanoparticles ; Reduction ; Surface chemistry ; X-ray photoelectron spectroscopy
  • É parte de: Chemical engineering journal (Lausanne, Switzerland : 1996), 2014-03, Vol.239, p.114-122
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] •Iron doped ordered mesoporous carbon (Fe/CMK-3) was applied as a novel remediation material to remove hexavalent chromium (Cr(VI)).•A high capacity for the removal of Cr(VI) was observed.•Cr(VI) removal was an adsorption-coupled reduction process by Fe/CMK-3.•Fe/CMK-3 showed good magnetic separation performance and excellent reproducibility. In this study, a magnetic iron nanoparticles doped ordered mesoporous carbon (Fe/CMK-3) was successfully prepared for highly effective removal of Cr(VI). The resultant carbon material maintained ordered mesostructure, high surface area of 679.4m2g−1 with 4.42wt% magnetic nanoparticles (Fe0, Fe3O4 and λ-Fe2O3) inside, and excellent magnetic property. Batch experiments were conducted to investigate the removal performance. Fe/CMK-3 exhibited higher Cr(VI) removal efficiency (∼97%), broader pH scope of application and easier separation compared with pristine ordered mesoporous carbon (CMK-3). The kinetics data were well described by pseudo-second-order kinetic model, and Langmuir model fitted the sorption isotherms commendably. Moreover, the Cr loaded Fe/CMK-3 could be regenerated by 0.01molL−1 NaOH solution, and the removal capacity decreased by ∼22% in the seventh cycle. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the Cr(VI) removal was a adsorption and synergistic reduction process owing to trivalent chromium Cr(III) occurring on the surface of Fe/CMK-3. The results suggested that Fe/CMK-3 had potential superiority in removal of Cr(VI) from wastewater.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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