Dehalogenation of Chlorinated Benzenes by Iron Sulfide

J. Hara, C. Inoue, T. Chida, Y. Kawabe, and T. Komai (Japan)


dehalogenation, iron sulfide, natural attenuation, chlorinated benzenes


Experimental studies of dehalogenation for chlorinated benzenes were conducted using iron sulfide (FeS2) at 25 o C in pure water. Chlorinated benzenes are used as a model sample of persistent organic pollutants (POPs) and evaluate the dechlorination ability of natural metallic minerals for POPs. A total of 90 % of chlorinated benzenes are dechlorinated after a mere 10 days for mono-, di-, tri- chlorobenzenes and 1,2,3,4-, 1,2,3,5 tetrachlorobenzenes. Their dechlorination abilities are not sensitive to the difference in isomers. The other 1,2,4,5 tetrachlorobenzene, pentachlorobenzene and hexachloro benzene are also dechlorinated at about 10 to 30 % after 10 days. This dehalogenation is only utilized in the dissolution of natural metallic minerals. Metallic minerals such as iron sulfide are expected to have sufficient remediation ability not only for chemical treatment but also as a natural depollution mineral.

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