Hydroxyl radical yields in the Fenton process under various pH, ligand concentrations and hydrogen peroxide/Fe(II) ratios

Chemosphere
Alexandra FischbacherTorsten C Schmidt

Abstract

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.

Citations

Sep 15, 2019·Journal of Experimental & Clinical Cancer Research : CR·Fang WangPeng Shang
Jul 15, 2020·Nucleic Acids Research·Rebecca Guth-MetzlerLoren Dean Williams
Sep 7, 2018·Environmental Science and Pollution Research International·Hamid MosmeriSeyed Mohammad Mehdi Dastgheib
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Aug 28, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jan Čapek, Tomáš Roušar
Oct 5, 2021·Ageing Research Reviews·Kai SunFengjing Guo

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