| 19117591 |
Kwon BG, Kim E, Lee JH: Pentachlorophenol decomposition by electron beam process enhanced in the presence of Fe (III)-EDTA. Chemosphere. 2009 Mar;74(10):1335-9. Epub 2008 Dec 30.
This study focuses on the enhanced decomposition of pentachlorophenol (PCP) in an electron beam (E-beam) process. To attain this objective, we investigated a synergistic effect of ferric-ethylenediamineacetate (Fe (III)-EDTA) and H (2) O (2) as additives to produce additional hydroxyl radical (*OH) at low dose. In this process, aqueous electron and hydrogen atom rapidly react with O (2) molecules, thereby forming hydroperoxyl/superoxide anion radical (HO2*/O (2)(-)), which reduces the Fe (III)-EDTA into Fe (II)-EDTA. Further *OH is produced by a well-known Fenton-like reaction of Fe (II)-EDTA with H (2) O (2) formed newly in E-beam. The complete decomposition of the initial PCP at 0.1mM was enhanced even at very low dose (<10 kGy) with 20 microM Fe (III)-EDTA and H (2) O (2) less than 1mM. This observation was supported by the increased amount of Cl (-) produced by the decomposition of PCP. Thus, in the presence of Fe (III)-EDTA during E-beam irradiation, the HO2*/O (2)(-)-driven Fenton-like reaction produces much more () OH, which is significant for the complete degradation of PCP. |
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