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Active iron bound to SOM catalyzes H2O2 to oxidize alkanes in soil

Abstract

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

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Publication details

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, Accepted Manuscript
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    Active iron bound to SOM catalyzes H2O2 to oxidize alkanes in soil

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

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