PMID: 11337840May 8, 2001Paper

Photodegradation of chlorinated hydrocarbons in the presence and absence of dissolved oxygen in water

Water Research
H ShirayamaS Taguchi

Abstract

The photodegradation rates of seven chlorinated hydrocarbons; C2Cl4, C2HCl3, C2H4Cl2, 1,1,1-C2H3Cl3, 1,1,2-C2H3Cl3, CHCl3, CCl4 were investigated under the UV bandwidths of 185 and 254 nm in the presence and absence of dissolved oxygen (DO) in water. These hydrocarbons are possible contaminants of groundwater. This study confirms that the degradation rates of all chlorinated hydrocarbons are elevated in the absence of DO. This was especially apparent for chlorinated methane and ethane. Tetrachloroethylene's rate was the highest among the seven hydrocarbons regardless of the DO levels. It was clear that the concentration of intermediate trichloroethylene produced by photodegradation of tetrachloroethylene in the absence of DO was 1/50th of that in the presence of DO. Photodegradation in the presence of DO resulted in the formation of O3 and hydroxyl radicals. Alternatively, the photodegradation in the absence of DO resulted in the formation of organic radicals and a dissociation of the bond. It is discussed that DO acts as an "inner filter" or "scavenger" that reduces the UV light intensity in the photoreactor. Molecular O2 has absorption bands at 185 and 254 nm, the former being stronger. The processes of degradation depend on ...Continue Reading

References

Aug 1, 1987·Environmental Science & Technology·T M VogelP L McCarty
Jun 1, 1985·Environmental Science & Technology·D F Ollis

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Citations

Feb 2, 2013·Iranian Journal of Environmental Health Science & Engineering·Mahdi KargarBagher Pahlevanzadeh
Jan 28, 2014·Water Research·Kristin ZoschkeEckhard Worch
Jan 15, 2016·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Krisztina KovácsTünde Alapi
Mar 13, 2014·Journal of the American Chemical Society·Ji-Min HanLing Zang
Nov 27, 2008·Bulletin of Environmental Contamination and Toxicology·Xie GuohongZheng Liqing
Feb 18, 2006·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Qing HuangQunhui Wang
Mar 29, 2019·Organic & Biomolecular Chemistry·Yasunori TodaHiroyuki Suga
Jun 20, 2012·Chemistry, an Asian Journal·Kazumitsu Kawakami, Akihiko Tsuda
Jan 23, 2020·Environmental Science and Pollution Research International·Mohammad AghaeiAmir Homayoun Keihan
Apr 10, 2010·Water Research·Meng Nan ChongChris Saint

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