Trichloroethylene degradation by PVA-coated calcium peroxide nanoparticles in Fe(II)-based catalytic systems: enhanced performance by citric acid and nanoscale iron sulfide

Ali, M ; Sharif University of Technology | 2021

341 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s11356-020-10678-3
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2021
  4. Abstract:
  5. In this study, the enhanced trichloroethylene (TCE) degradation performance was investigated by polyvinyl alcohol coated calcium peroxide nanoparticles (PVA@nCP) as an oxidant in Fe(II)-based catalytic systems. The nanoscale iron sulfide (nFeS), having an average particle size of 115.4 nm, was synthesized in the laboratory and characterized by SEM, TEM, HR-TEM along with EDS elemental mapping, XRD, FTIR, ICP-OES, and XPS techniques. In only ferrous iron catalyzed system (PVA@nCP/Fe(II)), TCE degradation was recorded at 58.9% in 6 h. In comparison, this value was increased to 97.5% or 99.7% with the addition of citric acid (CA) or nFeS in PVA@nCP/Fe(II) system, respectively. A comparative study was performed with optimum usages of chemical reagents in both PVA@nCP/Fe(II)/CA and PVA@nCP/Fe(II)/nFeS systems. Further, the probe compounds tests and electron paramagnetic resonance (EPR) analysis confirmed the generation of reactive oxygen species. The scavenging experiments elucidated the dominant role of HO• to TCE degradation, particularly in PVA@nCP/Fe(II)/nFeS system. Both CA and nFeS strengthened PVA@nCP/Fe(II) system, but displayed completely different mechanisms in the enhancement of active radicals generation; hence, their different contribution to TCE degradation. The acidic environment was favorable for TCE degradation, and a high concentration of HCO3− inhibited TCE removal in both systems. Conclusively, compared to PVA@nCP/Fe(II)/nFeS system, PVA@nCP/Fe(II)/CA system resulted in encouraging TCE degradation outcomes in actual groundwater, showing great potential for prolonged benefits in the remediation of TCE polluted groundwater. [Figure not available: see fulltext.] © 2020, Springer-Verlag GmbH Germany, part of Springer Nature
  6. Keywords:
  7. Catalyst ; Comparative study ; Degradation ; Detection method ; Inorganic compound ; Iron sulfide ; Nanoparticle ; Particle size ; Performance assessment ; Polymer ; Calcium peroxide ; Ferrous ion ; Ferrous sulfide ; Ground water ; Peroxide ; Polyvinyl alcohol ; Oxidation reduction reaction ; Water pollutant ; Catalysis ; Citric Acid ; Ferrous Compounds ; Groundwater ; Nanoparticles ; Oxidation-Reduction ; Peroxides ; Trichloroethylene ; Water Pollutants, Chemical
  8. Source: Environmental Science and Pollution Research ; Volume 28, Issue 3 , 2021 , Pages 3121-3135 ; 09441344 (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs11356-020-10678-3