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首页> 外文会议>The Meeting of the International Humic Substances Society >Catalytic Decomposition of Pentachlorophenol by the Iron Fenton System: The Dual Role of Humic Acid
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Catalytic Decomposition of Pentachlorophenol by the Iron Fenton System: The Dual Role of Humic Acid

机译：铁芬顿系统催化分解五氯苯酚：腐殖酸的双重作用

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The effect of Fenton [Fe/H2O2] on the catalytic decomposition of pentachlorophenol (PCP) in the presence and absence of humic acid (HA) was evaluated. Numerous studies have shown that HA can act either as an enhancer or inhibitor of the Fenton reaction. Herein, by combining electron paramagnetic resonance (EPR) spectroscopic and catalytic data, it is shown that HA can act in a dual manner, e.g. either as an enhancer or as an inhibitor for PCP oxidation, depending on the initial Fe/HA ratio. A quantitative limit was established: (i) at low Fe/HA < 1.17 mmol/gr, the presence of HA resulted in a decrease in PCP decomposition while (ii) at high Fe/HA > 1.17 mmol/gr, a significant enhancement was observed. EPR spectroscopy revealed that HA acted (i) as a chelator of Fe and (ii) as a redox agent. The data reveal the presence of two types of Fe-binding sites in HA: (a) strong Fe-binding sites and (b) weak Fe-binding sites where Fe is susceptible to reduction.
机译：评价FENTON [Fe / H 2 O2]对腐殖酸（HA）在存在和不存在的五氯苯酚（PCP）催化分解的影响。 许多研究表明，HA可以作为芬顿反应的增强剂或抑制剂。 这里，通过组合电子顺磁共振（EPR）光谱和催化数据，示出了HA可以以双向行动，例如， 作为增强剂或作为PCP氧化的抑制剂，取决于初始Fe / HA比。 建立了定量限制：（i）在低Fe / ha <1.17mmol / gr下，HA的存在导致PCP分解的降低，而在高Fe / Ha> 1.17mmol / gr处，显着的增强 观测到的。 EPR光谱显示，HA用作Fe和（II）的螯合剂作为氧化还原剂。 数据显示，在HA：（a）强的Fe结合位点和（b）弱的Fe结合位点存在两种类型的Fe粘结位点，其中Fe易于还原。

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