School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China.
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; CAS Key Laboratory of Urban Pollutant Conversion, University of Science and Technology of China, China.
J Hazard Mater. 2018 Feb 5;343:176-180. doi: 10.1016/j.jhazmat.2017.09.011. Epub 2017 Sep 12.
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.
氧化铁可能与水环境污染中的其他污染物相互作用，进一步影响其毒性、迁移和归宿。本研究采用硝酸盐作为电子受体，在缺氧条件下，考察了针铁矿存在时 2,4-二硝基苯酚（2,4-DNP）的生物降解情况。实验结果表明，针铁矿促进了 2,4-DNP 的降解。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-氨基酚）的降解和转化。微生物群落分析结果表明，当针铁矿存在时，具有多环芳烃降解潜力的放线菌丰度增加。这可能部分解释了 2,4-DNP 的较高降解率。此外，另一种可以还原可溶性 Fe(III)和硝酸盐的脱硫梭菌 Desulfotomaculum reducens 也有所增加。结果进一步证实，水环境中的纳米材料将影响微生物群落，并进一步改变有毒污染物的转化过程。
