Active iron bound to SOM catalyzes the oxidization of alkanes in soil by H2O2. Issue 9 (24th August 2018)

• Record Type: Journal Article
• Authors: Xu, Jinlan; Cao, Qianqian; Zhang, Miaojia; Yang, Chengwei
• Is Part Of: Environmental science. Volume 20:Issue 9(2018)
• Page Start: 1273
• Page End: 1284
• Publication Date: 2018-08-24
• Subjects: Environmental monitoring -- Periodicals; Biological monitoring -- Periodicals; Environmental chemistry -- Periodicals; 363.7363
• DOI: 10.1039/c8em00129d
• Languages: English
• ISSNs: 2050-7887

Abstract

Abstract : To explore the oxidation effects and mechanisms for the oxidation of alkanes by H2 O2 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. Abstract : To explore the oxidation effects and mechanisms for the oxidation of alkanes by H2 O2 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 H2 O2, 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 H2 O2 decomposition to improve the removal efficiency of crude oil in contaminated soil.