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Enhancement in reactivity via sulfidation of FeNi@BC for efficient removal of trichloroethylene: Insight mechanism and the role of reactive oxygen species

Shan, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.scitotenv.2021.148674
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. A novel catalyst of sulfidated iron-nickel supported on biochar (S-FeNi@BC) was synthesized to activate persulfate (PS) for the removal of trichloroethylene (TCE). A number of techniques including XRD, SEM, TEM, FTIR, BET and EDS were employed to characterize S-FeNi@BC. The influence of sulfur to iron ratio (S/F) on TCE removal was investigated by batch experiments and a higher TCE removal (98.4%) was achieved at 0.22/1 ratio of S/F in the PS/S-FeNi@BC oxidation system. A dominant role in iron species conversion was noticed by the addition of sulfur in FeNi@BC system. Significant enhancement in recycling of the dissolved and surface Fe(II) was confirmed which contributed to the generation of free and surface-bound active radical species (OH[rad], O2[rad]−, 1O2, SO4[rad]−). Further, the presence and contribution of these radicals were validated by the electron paramagnetic resonance (EPR) and quenching study. In addition, XPS results demonstrated the dominant role of S(-II) with the increase of Fe(II) from 36.3% to 58.6% and decrease of Fe(III) from 52.1% to 39.8% in the PS/S-FeNi@BC system. In crux, the influence of initial pH, catalyst dosage, oxidant dosage, and inorganic ions (HCO3−, Cl−, NO3− and SO42−) on TCE removal was also investigated. The findings obtained from this study suggest that S-FeNi@BC is an appropriate catalyst to activate PS for TCE contaminated groundwater remediation. © 2021 Elsevier B.V
  6. Keywords:
  7. Anesthetics ; Catalysts ; Electron spin resonance spectroscopy ; Groundwater ; Iron compounds ; Paramagnetic resonance ; Remediation ; Bio chars ; Iron-nickel ; Novel catalysts ; Persulphate ; Reactive oxygen species ; S-feni@BC ; Sulfidation ; Synergistic mechanism ; Synthesised ; ]+ catalyst ; Bicarbonate ; Chlorine derivative ; Ion ; Iron derivative ; Nickel ; Nitrate ; Sulfate ; Sulfur derivative ; Ferric ion ; Ground water ; Reactive oxygen metabolite ; Biochar ; Catalyst ; Groundwater pollution ; Iron ; Sulfur ; Catalysis ; Chemical analysis ; Chemical reaction ; Controlled study ; Eectron spin resonance ; Energy dispersive X ray spectroscopy ; Fourier transform infrared spectroscopy ; Oxidation ; PH ; Recycling ; Scanning electron microscopy ; Synthesis ; Transmission electron microscopy ; Validation process ; Waste component removal ; X ray diffraction ; Oxidation reduction reaction ; Water pollutant ; Ferric Compounds ; Oxidation-Reduction ; Trichloroethylene ; Water Pollutants, Chemical
  8. Source: Science of the Total Environment ; Volume 794 , 2021 ; 00489697 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0048969721037463