Humic substance-mediated reduction of iron(III) oxides and degradation of 2,4-D by an alkaliphilic bacterium, Corynebacterium humireducens MFC-5.
Humic substance-mediated reduction of iron(III) oxides and degradation of 2,4-D by an alkaliphilic bacterium, Corynebacterium humireducens MFC-5.
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腐殖质介导的铁 (III) 氧化物还原和嗜碱性细菌（腐殖棒杆菌 MFC-5）降解 2,4-D
DOI：
10.1111/1751-7915.12003
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发表时间：
2013-03
影响因子：
5.7
通讯作者：
Li FB
中科院分区：
文献类型：
--
作者：
Wu CY;Zhuang L;Zhou SG;Yuan Y;Yuan T;Li FB
利用嗜碱细菌Corynebacterium humirecucens MFC-5，研究了在碱性条件下（pH = 9.0），不同腐殖物质和醌类化合物对针铁矿（α-FeOOH）还原和2，4-二氯苯氧乙酸（2，4-D）降解的影响。 结果表明：（1）以蔗糖为电子供体，MFC-5菌株对蒽醌-2，6-二磺酸（AQDS）、蒽醌-2-二磺酸（AQS）、蒽醌-2-羧酸（AQC）、胡敏酸（HA）和富里酸（FA）具有还原能力，其还原能力依次为AQC > AQS > AQDS > FA > HA;（ii）该菌对α-FeOOH和2，4-D的厌氧还原作用不明显，而醌类/腐殖酸类作为氧化还原介质，则显著增强了该菌对α-FeOOH和2，4-D的厌氧还原作用;（iii）Fe（III）的还原速率与醌官能团的含量和醌的电子接受容量（EAC）呈正相关。腐殖酸的傅里叶变换红外光谱（FT-IR）和电化学分析的基础上，然而，这种关系没有发现在2，4-D的降解可能是因为醌还原不是速率限制步骤的醌介导的2，4-D的还原。本研究以α-FeOOH和2，4-D为例，充分论证了在碱性还原环境中，腐殖酸还原对Fe（III）/Fe（II）生态地球化学循环和氯代有机物降解的重要作用。本研究得到了国家自然科学基金（Nos 41101211，31070460，41101477）和国家教育部留学回国人员科研基金资助项目的资助。
With the use of an alkaliphilic bacterium, Corynebacterium humireducens MFC-5, this study investigated the reduction of goethite (α-FeOOH) and degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) mediated by different humic substances (humics) and quinones in alkaline conditions (pH of 9.0). The results indicated that (i) using sucrose as the electron donor, the strain MFC-5 was capable of reducing anthraquinone-2,6-disulfonic acid (AQDS), anthraquinone-2-disulfonic acid (AQS), anthraquinone-2-carboxylic acid (AQC), humic acid (HA) and fulvic acid (FA), and its reducing capability ranked as AQC > AQS > AQDS > FA > HA; (ii) the anaerobic reduction of α-FeOOH and 2,4-D by the strain was insignificant, while the reductions were greatly enhanced by the addition of quinones/humics serving as redox mediators; (iii) the Fe(III) reduction rate was positively related to the content of quinone functional groups and the electron-accepting capacities (EAC) of quinones/humics based on fourier-transform infrared spectroscopy (FT-IR) and electrochemical analyses; however, such a relationship was not found in 2,4-D degradation probably because quinone reduction was not the rate-limiting step of quinone-mediated reduction of 2,4-D. Using the example of α-FeOOH and 2,4-D, this study well demonstrated the important role of humics reduction on the Fe(III)/Fe(II) biogeochemical cycle and chlorinated organic compounds degradation in alkaline reducing environments. Funding Information This study was supported by the National Natural Science Foundation of China (Nos 41101211, 31070460, 41101477), and The Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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影响因子：
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DOI：
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发表时间：
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影响因子：
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作者：
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影响因子：
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