在不同 pH 值、配体浓度和过氧化氢/Fe(II) 比下的芬顿过程中羟基自由基的产量。
Hydroxyl radical yields in the Fenton process under various pH, ligand concentrations and hydrogen peroxide/Fe(II) ratios.
机构信息
Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141 Essen, Germany.
Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141 Essen, Germany; Max-Planck-Institut für Bioanorganische Chemie, Stiftstr. 34-36, 45413 Mülheim an der Ruhr, Germany.
出版信息
Chemosphere. 2017 Sep;182:738-744. doi: 10.1016/j.chemosphere.2017.05.039. Epub 2017 May 7.
The Fenton process, one of several advanced oxidation processes, describes the reaction of Fe(II) with hydrogen peroxide. Fe(II) is oxidized to Fe(III) that reacts with hydrogen peroxide to Fe(II) and again initiates the Fenton reaction. In the course of the reactions reactive species, e.g. hydroxyl radicals, are formed. Conditions such as pH, ligand concentrations and the hydrogen peroxide/Fe(II) ratio may influence the OH radical yield. It could be shown that at pH < 2.7 and >3.5 the OH radical yield decreases significantly. Two ligands were investigated, pyrophosphate and sulfate. It was found that pyrophosphate forms a complex with Fe(III) that does not react with hydrogen peroxide and thus, the Fenton reaction is terminated and the OH radical yields do not further increase. The influence of sulfate is not as strong as that of pyrophosphate. The OH radical yield is decreased when sulfate is added but even at higher concentrations the Fenton reaction is not terminated.
芬顿工艺是几种高级氧化工艺之一，描述了 Fe(II)与过氧化氢的反应。Fe(II)被氧化为 Fe(III)，Fe(III)与过氧化氢反应生成 Fe(II)，并再次引发芬顿反应。在反应过程中，会形成活性物质，例如羟基自由基。pH 值、配体浓度和过氧化氢/Fe(II)比例等条件可能会影响 OH 自由基的产率。结果表明，在 pH<2.7 和 pH>3.5 时，OH 自由基的产率会显著降低。研究了两种配体，焦磷酸根和硫酸根。结果发现，焦磷酸根与 Fe(III)形成了不与过氧化氢反应的配合物，因此，芬顿反应终止，OH 自由基的产率不再增加。硫酸根的影响不如焦磷酸根强。当添加硫酸根时，OH 自由基的产率会降低，但即使在较高浓度下，芬顿反应也不会终止。
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