School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
J Hazard Mater. 2017 Jan 15;322(Pt B):516-524. doi: 10.1016/j.jhazmat.2016.10.018. Epub 2016 Oct 12.
Under the action of hydrogen peroxide, soil organic matter (SOM) can transform dissolved iron (Fe) into the solid phase. Solid iron is bound to SOM (Fe-SOM), and two components are included: iron oxides bound to SOM (Fe-SOM oxides) and organic iron bound to SOM (organic Fe-SOM). In oil-contaminated soil samples with Fe-SOM, total petroleum hydrocarbon (TPH) was degraded by 67%; however, in oil-contaminated soil samples without Fe-SOM, the degradation of TPH was only 6%. In oil-contaminated soil samples with Fe-SOM, 73-86% of the primary alkanes (C-C composed 67.5% of TPH) were removed, whereas only 45-65% of the C-C and C-C alkanes were removed. The 11 types of alkanes (C-C and C-C) accounted for only 32.5% of TPH. Obviously, the degradation of TPH by Fe-SOM is independent of its hydrophobicity in the solid phase. The results also demonstrated that at a higher content of Fe-SOM, more hydroxyl radical (OH) was produced in the solid phase and more TPH was degraded. A large number of OH are generated near iron-SOM-oil interface.
在过氧化氢的作用下，土壤有机质（SOM）可以将溶解态铁（Fe）转化为固相。固相铁与 SOM 结合（Fe-SOM），包括两个组成部分：与 SOM 结合的氧化铁（Fe-SOM 氧化物）和与 SOM 结合的有机铁（organic Fe-SOM）。在含有 Fe-SOM 的石油污染土壤样品中，总石油烃（TPH）的降解率为 67%；然而，在不含 Fe-SOM 的石油污染土壤样品中，TPH 的降解率仅为 6%。在含有 Fe-SOM 的石油污染土壤样品中，73-86%的直链烷烃（由 C-C 组成，占 TPH 的 67.5%）被去除，而 C-C 和 C-C 直链烷烃仅被去除 45-65%。11 种烷烃（C-C 和 C-C）仅占 TPH 的 32.5%。显然，Fe-SOM 对 TPH 的降解与其在固相中的疏水性无关。结果还表明，在较高含量的 Fe-SOM 下，固相中会产生更多的羟基自由基（OH），从而降解更多的 TPH。大量的 OH 在铁-SOM-油界面附近产生。
