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首页> 外文期刊>RSC Advances >Enhanced reductive transformation of 2,4-dinitroanisole in a anaerobic system: the key role of zero valent iron
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Enhanced reductive transformation of 2,4-dinitroanisole in a anaerobic system: the key role of zero valent iron

机译：2,4-二硝基苯甲醚在厌氧系统中的增强还原转化：零价铁的关键作用

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摘要

Accelerated reduction of typical multi-substituted nitroaromatic compounds (NACs), i.e., 2,4-dinitroanisole (DNAN), was achieved in an anaerobic system coupled with zero valent iron (ZVI), with the underlying role of ZVI in this process elucidated. Both removal of DNAN and formation of its final reductive product 2,4-diaminoanisole (DAAN) were notably improved in the ZVI coupled biosystem. In the ZVI coupled biosystem and biotic control system, complete removal of DNAN could be achieved within 4 h and 20 h, respectively. However, only 28.71 +/- 5.06% of DNAN could be removed in the ZVI control system after 20 h. Correspondingly, the formation efficiencies of DAAN in the ZVI coupled biosystem, biotic control system and ZVI control system were 99.66 +/- 0.70%, 16.99 +/- 1.73% and 0.00 +/- 0.00%, respectively. The increased DNAN removal and DAAN formation in the ZVI coupled biosystem was linked to the high accumulation of formate, low oxidation-reduction potential (ORP) and great pH self-buffering capability, which was provided by the addition of ZVI. Compared with the biotic control system, the production of CH4 was significantly accelerated in the ZVI coupled biosystem, indicating that a favorable environment for methanogens was created at the presence of ZVI. Especially, the ZVI coupled biosystem displayed a more stable performance in terms of DNAN reduction with the coexistence of the competitive electron acceptors, such as nitrate and sulfate. Therefore, the ZVI coupled biosystem could be a promising alternative to the conventional anaerobic reduction process for the removal of multi-substituted NACs from wastewater.
机译：在与零价铁（ZVI）结合的厌氧系统中，典型的多取代硝基芳族化合物（NAC）（即2,4-二硝基苯甲醚（DNAN））的加速还原得以实现，阐明了ZVI在该过程中的潜在作用。在ZVI偶联生物系统中，DNAN的去除和其最终还原产物2，4-二氨基茴香醚（DAAN）的形成均得到显着改善。在ZVI耦合生物系统和生物控制系统中，分别在4小时和20小时内可以完全去除DNAN。但是，在20小时后，ZVI对照系统中只能去除28.71 +/- 5.06％的DNAN。相应地，DAVI在ZVI偶联生物系统，生物控制系统和ZVI控制系统中的形成效率分别为99.66 +/- 0.70％，16.99 +/- 1.73％和0.00 +/- 0.00％。 ZVI偶联生物系统中增加的DNAN去除和DAAN形成与甲酸的高积累，低氧化还原电位（ORP）和强大的pH自缓冲能力有关，这是通过添加ZVI提供的。与生物控制系统相比，ZVI耦合生物系统中CH4的产生显着加快，这表明在ZVI的存在下为产甲烷菌创造了有利的环境。尤其是，ZVI偶联生物系统在DNAN还原方面与竞争性电子受体（例如硝酸盐和硫酸盐）并存，表现出更稳定的性能。因此，ZVI耦合生物系统可能是从废水中去除多取代NAC的常规厌氧还原工艺的有前途的替代品。

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