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Synthesis of nZVI-Ni@BC composite as a stable catalyst to activate persulfate: Trichloroethylene degradation and insight mechanism

Shan, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jece.2020.104808
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. In Fenton-like oxidation processes, the use of biochar (BC) as support material for the nanoscale zero valent iron-nickel (nZVI-Ni) bimetallic particles attained much attention to activate persulfate (PS) for TCE degradation in aqueous medium. In present work, nZVI-Ni@BC particles with nZVI-Ni to BC mass ratio of 1:5 exhibited excellent results (> 99 % ± 0.24) for TCE degradation. The physico-chemical characteristics, surface morphologies, and elemental mapping of the synthesized nZVI-Ni@BC particles investigated through SEM, EDX, TEM, XPS, XRD, BET and FTIR spectroscopy. For the nZVI-Ni@BC-persulfate system, the effects of PS concentration, initial pH, inorganic ions and natural organic matter (NOM) on TCE degradation were evaluated. Batch experiments revealed that complete removal of TCE (> 99 % ± 0.25) was attained at 250 mg L-1of nZVI-Ni@BC and 4.0 mM PS dosages at pH 3.49 ± 0.55. Scavenging and electron paramagnetic resonance (EPR) verified the dominant role of both SO4and OH radicals in acidic environment for degradation of TCE. Moreover, high level of carbonate, bicarbonates and NOM inhibited the overall TCE oxidation reaction. In summary, these results suggested that nZVI-NI@BC composite was an alternative, economic and promising catalyst for the activation of PS to degrade chlorinated contaminants in aqueous medium. © 2020 Elsevier Ireland Ltd. All rights reserved
  6. Keywords:
  7. Catalysts ; Electron spin resonance spectroscopy ; Fourier transform infrared spectroscopy ; Free radicals ; Nickel metallography ; Oxidation ; Paramagnetic resonance ; Acidic environment ; Bimetallic particles ; Electron paramagnetic resonances (EPR) ; Nano-scale zero valent irons ; Natural organic matters ; Oxidation process ; Physicochemical characteristics ; Support materials ; Nickel compounds
  8. Source: Journal of Environmental Chemical Engineering ; Volume 9, Issue 1 , 2021 ; 22133437 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S221334372031157X