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

Autor: Yan, Ni, Li, Mengjiao1, Liu, Yali1, Liu, Fei1 feiliu@cugb.edu.cn, Brusseau, Mark
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Zdroj: Water, Air & Soil Pollution. Dec2017, Vol. 228 Issue 12, p1-9. 9p.
Abstrakt: The efficacy of two oxidant systems, iron-activated hydrogen peroxide (HO) and iron-activated hydrogen peroxide coupled with persulfate (SO ), 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 (HPO ), 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 HPO on the degradation of TCE increased with increasing temperature for the iron-activated HO 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 (SO ∙) 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. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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