Iron oxide may interact with other pollutants in the aquatic environments and further influence their toxicity, transport and fate. The current study was conducted to investigate the biodegradation of 2,4-dinitrophenol (2,4-DNP) in the presence of iron oxide of goethite under anoxic condition using nitrate as the electron acceptor. Experiment results showed that the degradation rate of 2,4-DNP was improved by goethite. High performance liquid chromatography-mass spectra analysis results showed that goethite promoted degradation and transformation of 2,4-diaminophenol and 2-amino-4-nitrophenol (2-nitro-4-aminophenol). Microbial community analysis results showed that the abundance of Actinobacteria, which have the potential ability to degrade PAHs, was increased when goethite was available. This might partially explain the higher degradation of 2,4-DNP. Furthermore, another bacterium of Desulfotomaculum reducens which could reduce soluble Fe(III) and nitrate was also increased.Results further confirmed that nanomaterials in the aquatic environment will influence the microbial community and further change the transformation process of toxic pollutants.

中文翻译：

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针铁矿在硝酸盐还原条件下促进2,4-二硝基苯酚的生物降解

氧化铁可能与水生环境中的其他污染物相互作用，并进一步影响其毒性，运输和命运。目前的研究是在硝酸盐作为电子受体的条件下，在缺氧条件下针铁矿的氧化铁存在下，研究2,4-二硝基苯酚（2,4-DNP）的生物降解作用。实验结果表明，针铁矿提高了2,4-DNP的降解率。高效液相色谱-质谱分析结果表明，针铁矿促进了2,4-二氨基苯酚和2-氨基-4-硝基苯酚（2-硝基-4-氨基苯酚）的降解和转化。微生物群落分析结果表明，放线菌丰富当有针铁矿存在时，具有降解PAHs的潜在能力的物质会增加。这可能部分解释了2,4-DNP的更高降解。此外，还增加了另一种可以降低可溶性Fe（III）和硝酸盐的还原性Desulfotomaculum还原细菌。结果进一步证实，水环境中的纳米材料会影响微生物群落，并进一步改变有毒污染物的转化过程。