Homogeneous degradation of 1,2,9,10-tetrachlorodecane in aqueous solutions using hydrogen peroxide, iron and UV light.
The homogeneous degradation of the polychlorinated n-alkane, 1,2,9,10-tetrachlorodecane (T4C10), was studied in aqueous solutions of hydrogen peroxide, including Fenton and photo-Fenton reaction conditions. All solutions were adjusted to a pH of 2.8 and an ionic strength of 0.1 M NaClO4 prior to photolysis. T4C10 (2 x 10(-6) M) was substantially degraded by the H2O2/UV system (1.0 x 10(-2) M H2O2), with 60% disappearance in 20 min of irradiation in a photoreactor equipped with 300 nm lamps of light intensity 3.6 x 10(-5) Ein L(-1) min(-1) (established by ferrioxalate actinometry). The reaction produced stoichiometric amounts of chloride ion indicating complete dechlorination of the chlorinated n-alkane. T4C10 degraded very slowly under Fenton (Fe2+/H2O2/dark) and Fenton-like (Fe3+/H2O2/dark) conditions. However, when the same solutions were irradiated, T4C10 degraded more rapidly than in the H2O2/UV system, with 61% disappearance in 10 min of exposure. The rapid degradation is related to the enhanced degradation of hydrogen peroxide to oxidizing *OH radicals under photo-Fenton conditions. Degradation was inhibited in both the H2O2/UV and photo-Fenton systems by the addition of KI and tert-butyl alcohol due to *OH scavenging.
El-Morsi
Taha M
TM
Department of Chemistry, The University of Winnipeg, MB, Canada.
Emara
Moustafa M
MM
Abd El Bary
Hassan M H
HM
Abd-El-Aziz
Alaa S
AS
Friesen
Ken J
KJ
D000473:Alkanes / Q000737:chemistry*; D004785:Environmental Pollutants; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry*; D014466:Ultraviolet Rays
C467419:1,2,9,10-tetrachlorodecane; D000473:Alkanes; D004785:Environmental Pollutants; D006843:Hydrocarbons, Chlorinated; D016877:Oxidants; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron