title: Pentachlorophenol decomposition by electron beam process enhanced in the presence of Fe(III)-EDTA.
abstract: 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.
authors.affiliation: Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea. kwonbg0@daum.net
authors.forename: Bum Gun
authors.initials: BG
authors.lastname: Kwon
authors.forename: Eunjung
authors.initials: E
authors.lastname: Kim
authors.forename: Jai H
authors.initials: JH
authors.lastname: Lee
mesh_terms: D004492:Edetic Acid / Q000737:chemistry; D004583:Electrons; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D010084:Oxidation-Reduction; D010416:Pentachlorophenol / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D010416:Pentachlorophenol; C019179:Fe(III)-EDTA