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Pentachlorophenol Decomposition By Electron Beam Process Enhanced In The Presence Of Fe(iii)-edta

机译:Fe(iii)-edta的存在增强电子束过程中五氯苯酚的分解

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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-ethylenediamineac-etate (Fe(III)-EDTA) and H_2O_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 hydro-peroxyl/superoxide anion radical (HO_2~·/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_2O_2 formed newly in E-beam. The complete decomposition of the initial PCP at 0.1 mM was enhanced even at very low dose (<10 kCy) with 20 μM Fe(III)-EDTA and H_2O_2 less than 1 mM. 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 HO_2~·/O_2~--driven Fenton-like reaction produces much more OH, which is significant for the complete degradation of PCP.
机译:这项研究的重点是在电子束(电子束)过程中五氯苯酚(PCP)的增强分解。为了达到这个目的,我们研究了乙撑二胺铁(Fe(III)-EDTA)和H_2O_2作为添加剂在低剂量下产生额外羟基自由基(OH)的协同作用。在此过程中,水电子和氢原子迅速与O_2分子反应,从而形成氢过氧/超氧阴离子自由基(HO_2〜·/ O_2〜-),从而将Fe(III)-EDTA还原为Fe(II)-EDTA 。通过众所周知的Fe(II)-EDTA与电子束中新形成的H_2O_2的Fenton样反应,可以进一步生成OH。即使使用20μMFe(III)-EDTA和H_2O_2小于1 mM的极低剂量(<10 kCy),也可以增强0.1 mM时初始PCP的完全分解。 PCP分解产生的Cl量增加支持了这一观察结果。因此,在电子束辐照过程中存在Fe(III)-EDTA时,HO_2〜·/ O_2〜驱动的Fenton样反应产生更多的OH,这对于PCP的完全降解非常重要。

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