2-Nitrophenol reduction promoted by S-putrefaciens 200 and biogenic ferrous iron: The role of different size-fractions of dissolved organic matter

文献类型： 外文期刊

第一作者： Zhu, Zhenke

作者： Zhu, Zhenke;Tao, Liang;Li, Fangbai;Zhu, Zhenke;Zhu, Zhenke

作者机构：

关键词： Dissolved organic matter;Dissimilatory reduction of iron oxides;Interfacial reaction;Electron transfer capacities;2-nitrophenol

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2014 年 279 卷

页码：

收录情况： SCI

摘要： The reduction of nitroaromatic compounds (listed as a priority pollutant) in natural subsurface environments typically coexists with dissimilatory reduction of iron oxides effected by dissolved organic matter (DOM). Investigating the impact of the DOM that influences those reduction processes is crucial for understanding and predicting the geochemical fate of these environmental species. This study investigated the impact of different molecular weight DOM fractions (DMWDs) on the 2-nitrophenol (2-NP) reduction by S. putrefaciens 200 (SP200) and alpha-Fe2O3 with lactate (excluding electron donor interference). Kinetic measurements demonstrated that 2-NP reduction rates were affected by the redox reactivity of active species under DMWDs (denoted as L-DOM, M-DOM, and H-DOM). The enhanced reduction rates are consistent with the negative shifts in peak oxidation potential values, the increases in HA-like/FA-like values, aromaticity index values and electron transfer capacity values. L-DOM acted mainly as ligands to complex Fe(II), whereas the significant role of H-DOM in reductive reactions should be acting as an electron shuttle, transferring electrons from SP200 to Fe(III) and 2-NP and from biogenic Fe(II) to 2-NP, further accelerating the 2-NP reductions. Those observations provide valuable insights into the role of DOM in the biogeochemical redox processes and the remediation of contaminated soil in a natural environment. (C) 2014 Elsevier B.V. All rights reserved.

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