Title of article :
Formation of hydroxylated and dimeric intermediates during oxidation of chlorinated phenols in aqueous solution
Author/Authors :
Arja Hirvonen، نويسنده , , Marina Trapido، نويسنده , , Johanna Hentunen، نويسنده , , Juhani Tarhanen، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Abstract :
The oxidation of selected chlorophenols (2-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol and pentachlorophenol) was studied in aqueous solutions using UV/H2O2 and O3 methods. The formation of oxidation intermediates was measured to elucidate their importance in the treatment of chlorophenols. Results indicated that chlorophenols can be treated efficiently by the methods studied, but the dechlorination of the compounds was insufficient. Analysis of intermediates in the acetylated extraction fractions showed that hydroxylation of chlorophenols and formation of dimeric products were involved in the oxidation of chlorophenols in both treatment processes. The majority of the intermediates detected were transient, and thus were not detectable after an extended treatment time. The presence of a complicated mixture of intermediates suggests the need for toxicity testing to confirm the detoxifying effect of the chemical oxidation of chlorophenols.
Keywords :
Hydrogen peroxide , UV radiation , chlorophenols , ozonation , Oxidation by-products
Journal title :
Chemosphere
Journal title :
Chemosphere