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首页> 外文期刊>RSC Advances >Catalytic reduction of NACs by nano Fe3O4/quinone composites in the presence of a novel marine exoelectrogenic bacterium under hypersaline conditions
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Catalytic reduction of NACs by nano Fe3O4/quinone composites in the presence of a novel marine exoelectrogenic bacterium under hypersaline conditions

机译：新型海洋外生电细菌在高盐度条件下用纳米Fe 3 O 4 /醌复合物催化还原NAC

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Bioremediation of N-substituted aromatic compounds (NACs) has attracted a substantial amount of interest due to its cost effectiveness and environmental friendliness. However, the slow anaerobic NACs' reduction rate and the large amount of salt in wastewater are bottlenecks for biotechnology applications. In this study, a novel marine strain, Shewanella sp. CNZ-1, capable of reducing NACs under hypersaline conditions was isolated. To enhance the NACs reduction rate, two Fe3O4/quinone nanocomposites were first prepared via a mild covalent chemical reaction. SEM-EDX, FTIR, XRD, XPS, TG and VSM analyses were performed to illustrate the reaction process. The catalytic results showed that Fe3O4/2-carboxyl-anthraquinone (Fe3O4@COOHQ) exhibited a better catalytic performance in typical NACs bioreduction compared to Fe3O4/1,4-diamino-anthraquinone in the presence of strain CNZ-1. The NC reduction rates were approximately 2.2- to 6.5-fold higher than those lacking Fe3O4@COOHQ at 2–11% NaCl. The highest NC removal rate of 79.4 mg per h per g cell was achieved at 3% NaCl. The increased NC reduction rate is mainly due to the fact that Fe3O4@COOHQ could increase the NC reduction activity of cell membrane proteins containing dominant NC reductases. These findings indicate that strain CNZ-1 and Fe3O4@COOHQ could be used in designing a bioreactor for enhancing the treatment of NAC-containing wastewater containing a high concentration of salts.
机译：N-取代的芳族化合物（NAC）的生物修复由于其成本效益和环境友好性而引起了广泛的关注。然而，缓慢的厌氧NAC还原速率和废水中的大量盐分是生物技术应用的瓶颈。在这项研究中，一种新型海洋菌株 Shewanella sp。分离出能够在高盐条件下还原NAC的CNZ-1。为了提高NAC还原速率，首先通过制备了两种Fe 3 O 4 /醌纳米复合材料。 轻度的共价化学反应。进行了SEM-EDX，FTIR，XRD，XPS，TG和VSM分析以说明反应过程。催化结果表明，Fe 3 O 4 / 2-羧基蒽醌（Fe 3 O 4 @COOHQ）在典型NAC的生物还原中表现出比Fe 3 更好的催化性能。 CNZ-1菌株存在下，sub> O 4 / 1,4-二氨基蒽醌。 NC降低率比缺乏Fe 3 O 4 @COOHQ的NC降低率高约2.2-6.5倍在2-11％NaCl中。在3％NaCl下，最高的NC去除率为79.4 mg / h / g细胞。 NC还原率增加主要是由于Fe 3 O 4 @COOHQ可以增加NC含有主要的NC还原酶的细胞膜蛋白的还原活性。这些发现表明菌株CNZ-1和Fe 3 O 4 @COOHQ可以用于设计生物反应器用于增强对含高浓度盐的NAC废水的处理。

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