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Issue 9, 2018
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Active iron bound to SOM catalyzes the oxidization of alkanes in soil by H2O2

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To explore the oxidation effects and mechanisms for the oxidation of alkanes by H2O2 in a Fenton system catalyzed by two types of iron bound to soil organic matter (Fe-SOM) in crude oil-contaminated soil, an oxidation experiment was performed in active Fe-SOM and Fe-SOM systems. The results showed that the TPH removal ability of active Fe-SOM (average 0.36 g TPH/g Fe-SOM) was 2.25-fold higher than the corresponding value of Fe-SOM. Active Fe-SOM contained both –NH2 and –OH functional groups, and had a higher content of iron with high binding energy, while Fe-SOM only contained –NH2 groups. Thus, a large yield of hydroxyl radicals (·OH) was generated (8.92 a.u.) by active Fe-SOM catalyzing the decomposition of H2O2, while the corresponding yield of ·OH in the Fe-SOM system was only 4.81 a.u. In addition, the removal efficiency of C17–C23 (70%) was comparable to that of C24–C30 (69%), not restricted by the hydrophobicity of different alkanes. The alkane removal by active Fe-SOM was higher than that by Fe-SOM, although the content of Fe-SOM was double that of active Fe-SOM. In summary, the active Fe-SOM formed in the soil sample containing humic acid-like and hydrophobic acid derivates could catalyze H2O2 decomposition to improve the removal efficiency of crude oil in contaminated soil.

Graphical abstract: Active iron bound to SOM catalyzes the oxidization of alkanes in soil by H2O2

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The article was received on 21 Mar 2018, accepted on 15 Jun 2018 and first published on 26 Jul 2018

Article type: Paper
DOI: 10.1039/C8EM00129D
Citation: Environ. Sci.: Processes Impacts, 2018,20, 1273-1284

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    Active iron bound to SOM catalyzes the oxidization of alkanes in soil by H2O2

    J. Xu, Q. Cao, M. Zhang and C. Yang, Environ. Sci.: Processes Impacts, 2018, 20, 1273
    DOI: 10.1039/C8EM00129D

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