Promotion of the Fenton reaction by Cu2+ ions:: Evidence for intermediates
Promotion of the Fenton reaction by Cu2+ ions:: Evidence for intermediates
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DOI：
10.1002/kin.20205
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发表时间：
2006-12-01
影响因子：
1.5
通讯作者：
Kremer, Mordechai L.
中科院分区：
文献类型：
--
作者：
Kremer, Mordechai L.
采用宽范围的垂直棒Cu 2+垂直棒研究了Cu 2+离子对芬顿反应的促进作用。Fe ~（2+）的消失和O ~（2-）的生成都是随时间的变化而进行的，分别用邻菲咯啉或过量Fe ~（2+）猝灭反应。进行了两个系列的实验。在一个系列的垂直柱中，H2 O2垂直柱为5 × 10（-4）mol dm（-3），而在另一个垂直柱中，H2 O2垂直柱降低至5 × 10（-5）mol dm（-3）。通过用过量的Fe 2+离子停止反应，观察到两个系列中测量的吸光度的显著差异。在较高的垂直柱H2 O2垂直柱范围内，由于反应期间形成O-2，吸光度随时间单调下降。在较低范围内，观察到吸光度的初始瞬时上升，表明系统中形成了光谱学上不同的中间体。提出了FeOCu ~（4+）和FeOCu ~（5+）参与反应的机理。测定了该机理的速率常数。(c)2006 Wiley Periodicals，Inc.
The promotion of the Fenton reaction by Cu2+ ions has been investigated using a wide range of vertical bar Cu2+vertical bar. Both the disappearance of Fe2+ and the evolution of O-2 were followed as a function of time by quenching the reaction mixture with o-phenanthroline or with excess Fe2+ ions, respectively. Two series of experiments were performed. in one series vertical bar H2O2 vertical bar was 5 x 10(-4) mol dm(-3), and in the other vertical bar H2O2 vertical bar was reduced to 5 x 10(-5) mol dm(-3). By stopping the reaction with excess Fe2+ ions, significant differences in the measured absorbance in the two series were observed. In the higher vertical bar H2O2 vertical bar range, the absorbance decreased monotonically in time, due to O-2 formation during the reaction. In the lower range, an initial transient rise of the absorbance was observed, indicating the formation of spectroscopically distinct intermediates in the system. A mechanism involving the intermediates FeOCu4+ and FeOCu5+ has been set up. Rate constants of the mechanism have been determined. (c) 2006 Wiley Periodicals, Inc.