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Magnetite drives self-dechlorination of 4-chlorophenol in anoxic aquatic sediments
Chemosphere ( IF 8.8 ) Pub Date : 2021-01-18 , DOI: 10.1016/j.chemosphere.2021.129668
Yang Li , Ying Ma , Zisheng Zhao , Xin Wen , Guangkuo Xu , Lin Jiang , Lifen Liu , Yaobin Zhang , Zhiqiang Zhao

The lack of available electron donors is well known as a major factor limiting the efficiency of microbial dechlorination of 4-chlorophenol (4-CP) in anoxic aquatic sediments. Considering that Fe(III) minerals largely contained in sediments can especially enrich Fe(III)-reducing bacteria and unlock the ring-like intermediates produced by dechlorination of 4-CP via dissimilatory Fe(III) reduction, a strategy of self-dechlorination of 4-CP utilizing its metabolism intermediates such as short-fatty acids (SCFAs) as the endogenous electron donors with magnetite was proposed in this study. The results showed that the removal efficiency of 4-CP increased by 156–203% in magnetite-supplemented biotic groups compared with the magnetite-free biotic group. Liquid chromatography-mass spectrometer (LC-MS) and gas chromatography (GC) revealed the possible metabolic pathway of anoxic 4-CP degradation with magnetite: 4-CP→phenol→cyclohexene-1-carboxylic acid→2-hydroxycyclohexanecarboxylic acid→hexanoic acid/valeric acid→butyric/propionic acids→CO2. High-throughput sequencing analysis showed that the abundance of functional bacteria, Desulfuromonas, Pseudomonas and Bacillus species, were increased by 1.38–1.97, 1.50–2.04, and 11.60–17.18 folds in magnetite-supplemented biotic groups, compared with the magnetite-free biotic groups. Analysis of Fe2+ concentration and cyclic voltammetry (CV) suggested that the potential Fe(III)/Fe(II) transformation occurred and proceeded the anoxic 4-CP degradation continuously.



中文翻译:

磁铁矿驱动缺氧水沉积物中4-氯苯酚的自脱氯

众所周知,缺乏可用的电子供体是限制缺氧水生沉积物中4-氯苯酚(4-CP)微生物脱氯效率的主要因素。考虑到沉积物中大量包含的Fe(III)矿物可以特别富集还原Fe(III)的细菌,并通过异化Fe(III)还原来解锁4-CP脱氯产生的环状中间体,这是一种自我脱氯的策略。在这项研究中提出了4-CP利用其代谢中间体,例如短脂肪酸(SCFA)作为磁铁矿的内源电子供体。结果表明,与不含磁铁矿的生物组相比,补充磁铁矿的生物组对4-CP的去除效率提高了156–203%。2。高通量测序分析表明,功能菌的丰度,Desulfuromonas假单胞菌芽孢杆菌种,是在磁铁矿补充生物群体增加1.38-1.97,1.50-2.04,和11.60-17.18倍,与自由磁铁矿,生物相比,组。对Fe 2+浓度和循环伏安法(CV)的分析表明,潜在的Fe(III)/ Fe(II)发生了转化,并持续进行缺氧4-CP降解。

更新日期:2021-01-22
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