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Active iron bound to SOM catalyzes the oxidization of alkanes in soil by H 2 O 2 .
- Source :
-
Environmental science. Processes & impacts [Environ Sci Process Impacts] 2018 Sep 19; Vol. 20 (9), pp. 1273-1284. - Publication Year :
- 2018
-
Abstract
- 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.
- Subjects :
- Catalysis
Fluorometry
Humic Substances analysis
Hydroxyl Radical analysis
Oxidation-Reduction
Petroleum
Photoelectron Spectroscopy
Spectroscopy, Fourier Transform Infrared
Alkanes chemistry
Hydrogen Peroxide chemistry
Iron chemistry
Petroleum Pollution prevention & control
Soil chemistry
Soil Pollutants chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 2050-7895
- Volume :
- 20
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Environmental science. Processes & impacts
- Publication Type :
- Academic Journal
- Accession number :
- 30140829
- Full Text :
- https://doi.org/10.1039/c8em00129d