期刊
CHEMOSPHERE
卷 55, 期 5, 页码 715-723出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2003.11.021
关键词
Fenton's reagent; complexation reactions; inorganic radicals; atrazine; 4-nitrophenol; acetic acid
The effects of chloride, nitrate, perchlorate and sulfate ions on the rates of the decomposition of hydrogen peroxide and the oxidation of organic compounds by the Fenton's process have been investigated. Experiments were conducted in a batch reactor, in the dark at pH less than or equal to 3.0 and at 25 degreesC. Data obtained from Fe(II)/H2O2 experiments with [Fe(II)]0/ [H2O2](0) greater than or equal to 2 mol mol(-1), showed that the rates of reaction between Fe(II) and H2O2 followed the order SO42- > ClO4-=NO3-=Cl-. For the Fe(III)/H2O2 process, identical rates were obtained in the presence of nitrate and perchlorate, whereas the presence of sulfate or chloride markedly decreased the rates of decomposition of H2O2 by Fe(III) and the rates of oxidation of atrazine ([atrazine](0) = 0.83 muM), 4-nitrophenol ([4-NP](0) = 1 mM) and acetic acid ([acetic acid](0) = 2 mM). These inhibitory effects have been attributed to a decrease of the rate of generation of hydroxyl radicals resulting from the formation of Fe(III) complexes and the formation of less reactive (SO4.-) or much less reactive (Cl-4(.-)) inorganic radicals. (C) 2003 Elsevier Ltd. All rights reserved.
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