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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >New Insights of the Fenton Reaction Using Glycerol as the Experimental Model. Effect of O-2, Inhibition by Mg2+, and Oxidation State of Fe
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New Insights of the Fenton Reaction Using Glycerol as the Experimental Model. Effect of O-2, Inhibition by Mg2+, and Oxidation State of Fe

机译:使用甘油作为实验模型的Fenton反应的新见解。 O-2,Mg2 +抑制和Fe的氧化态的影响

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摘要

The use of iron ions as catalyst of oxidation with hydrogen peroxide, known as the Fenton reaction, is important for industry and biological systems. It has been widely studied since its discovery in the 19th century, but important aspects of the reaction as which is the oxidant, the role of oxygen, and the oxidation state of Fe still remain unclear. In this work new mechanistic insights of the oxidation of carbohydrates by the Fenton reaction using glycerol as experimental model are described. The reaction was studied by means of oxidation reduction potential (ORP) measures. The stoichiometry was measured, showing the important role of oxygen for lowering H2O2 consumption under aerobic conditions. Evidence is provided to demonstrate that in this system Fe2+ generates a catalyst by reacting with a substrate to produce a complex, which gives rise to singlet oxygen after reacting with H2O2. This is the first time that the inhibitor effect of Mg2+ is reported in this reaction, and its participation in the mechanism is described. A rational mechanism for the oxidation of glycerol using the Fenton reaction under these specific conditions is proposed. The role of oxygen, the participation of Fe2+, and the inhibition by Mg2+ are fully demonstrated experimentally.
机译:使用铁离子作为过氧化氢氧化的催化剂,称为Fenton反应,对工业和生物系统很重要。自19世纪被发现以来,已经对其进行了广泛的研究,但是反应的重要方面仍然是不清楚的,包括氧化剂,氧的作用和铁的氧化态。在这项工作中,描述了通过使用甘油作为实验模型的芬顿反应对碳水化合物氧化的新机制。通过氧化还原电位(ORP)措施研究了该反应。测量了化学计量,显示了氧在有氧条件下降低H2O2消耗的重要作用。提供的证据表明,在该系统中,Fe2 +通过与底物反应生成络合物而生成催化剂,该络合物与H2O2反应后会生成单线态氧。这是首次在该反应中报道Mg2 +的抑制作用,并描述了其参与机理。提出了在这些特定条件下利用Fenton反应氧化甘油的合理机理。氧气的作用,Fe2 +的参与以及Mg2 +的抑制作用已通过实验充分证明。

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