Kinetic and Thermodynamic Studies of Chlorinated Organic Compound Degradation by Siderite-Activated Peroxide and Persulfate

Ni Yan, Mengjiao Li, Yali Liu, Fei Liu, Mark L. Brusseau

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The efficacy of two oxidant systems, iron-activated hydrogen peroxide (H2O2) and iron-activated hydrogen peroxide coupled with persulfate (S2O82−), was investigated for treatment of two chlorinated organic compounds, trichloroethene (TCE) and 1,2-dichloroethane (DCA). Batch tests were conducted at multiple temperatures (10–50 °C) to investigate degradation kinetics and reaction thermodynamics. The influence of an inorganic salt, dihydrogen phosphate ion (H2PO4), on oxidative degradation was also examined. The degradation of TCE was promoted in both systems, with greater degradation observed for higher temperatures. The inhibition effect of H2PO4 on the degradation of TCE increased with increasing temperature for the iron-activated H2O2 system but decreased for the iron-activated hydrogen peroxide-persulfate system. DCA degradation was limited in the iron-activated hydrogen peroxide system. Conversely, significant DCA degradation (87% in 48 h at 20 °C) occurred in the iron-activated hydrogen peroxide-persulfate system, indicating the crucial role of sulfate radical (SO4∙) from persulfate on the oxidative degradation of DCA. The activation energy values varied from 37.7 to 72.9 kJ/mol, depending on the different reactants. Overall, the binary hydrogen peroxide-persulfate oxidant system exhibited better performance than hydrogen peroxide alone for TCE and DCA degradation.

Original languageEnglish (US)
Article number453
JournalWater, Air, and Soil Pollution
Volume228
Issue number12
DOIs
StatePublished - Dec 1 2017

Keywords

  • Activation energy
  • Advanced oxidation
  • Chlorinated organic compounds
  • Phosphate

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Ecological Modeling
  • Water Science and Technology
  • Pollution

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