Pentachlorophenol decomposition by electron beam process enhanced in the presence of Fe(III)-EDTA.
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.
Kwon
Bum Gun
BG
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea. kwonbg0@daum.net
Kim
Eunjung
E
Lee
Jai H
JH
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*
D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D010416:Pentachlorophenol; C019179:Fe(III)-EDTA