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

被引：156

作者：

Fischbacher, Alexandra ^{[1
]}

von Sonntag, Clemens ^{[1
,2
]}

Schmidt, Torsten C. ^{[1
,3
]}

机构：

[1] Univ Duisburg Essen, Instrumental Analyt Chem, Univ Str 5, D-45141 Essen, Germany

[2] Max Planck Inst Bioanorgan Chem, Stiftstr 34-36, D-45413 Mulheim, Germany

[3] Univ Duisburg Essen, Ctr Water & Environm Res ZWU, Univ Str 2, D-45141 Essen, Germany

来源：

CHEMOSPHERE | 2017年 / 182卷

关键词：

Fenton process; Hydroxyl radical yield; Ligands; Pyrophosphate; Sulfate; ADVANCED OXIDATION PROCESSES; AQUEOUS-SOLUTIONS; COMPLEX-FORMATION; PULSE-RADIOLYSIS; INORGANIC ANIONS; OH-RADICALS; IONS; DECOMPOSITION; FE(III)/H2O2; SPECIATION;

D O I：

10.1016/j.chemosphere.2017.05.039

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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. (c) 2017 Elsevier Ltd. All rights reserved.

引用

页码：738 / 744

页数：7

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