<br>细菌联盟对芘的生物降解：天然表面活性剂和氧化铁纳米颗粒的影响,Environmental Research

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细菌联盟对芘的生物降解：天然表面活性剂和氧化铁纳米颗粒的影响
Environmental Research ( IF 7.7 ) Pub Date : 2023-11-24 , DOI: 10.1016/j.envres.2023.117753
Punniyakotti Elumalai ₁ , Arunagiri Santhosh Kumar ₂ , Perumal Dhandapani ₃ , Jinjie Cui ₁ , Xueke Gao ₁ , A Arul Prakash ₄ , Rajaram Rajamohan ₅ , Mohamad S AlSalhi ₆ , Sandhanasamy Devanesan ₆ , Aruliah Rajasekar ₃ , Punniyakotti Parthipan ₂

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多环芳烃（PAH）是可能对许多生态系统造成严重影响的潜在危险化合物。由于它们的疏水性，使用传统方法去除它们非常具有挑战性。然而，这个问题可以通过利用表面活性分子来提高其生物利用度来解决。在这项研究中，选择芘作为多环芳烃化合物，以探索其通过单个细菌菌株（Pseudomonas stutzeri NA3 和 Acinetobacter baumannii MN3）和混合联盟（MC）以及源自无患子的天然表面活性剂和氧化铁纳米颗粒（NPs）的影响而降解。此外，脂肪酸酯、二肽和糖衍生物基团被确定为天然表面活性剂的有效生物活性成分。利用各种技术，如 XRD、VSM、TEM 和 FE-SEM 与 EDX，来表征原始和 Fenton 处理的氧化铁 NPs。分析结果证实，Fe3O4 晶相和球形 NPs 表现出优异的磁性能。天然表面活性剂和氧化铁 NP 的影响显着促进了生物降解过程，导致化学需氧量（COD）水平显着降低。气相色谱-质谱（GC-MS）分析表明，生物降解系统产生初级烃类中间体，这些中间体通过 Fenton 处理发生氧化降解。有趣的是，合成的氧化铁 NPs 在 Fenton 反应过程中有效地产生了羟基自由基（•OH），这被电子顺磁共振（EPR）光谱证实，并且观察到原始的氧化铁 NPs 发生了材料转变。该研究展示了一种生物降解和 Fenton 反应过程的集成方法，与其他系统相比，芘降解效率（90%）更高。在水生环境中使用天然表面活性剂和氧化铁 NP 是微生物和受污染油产品界面的重要平台。这种相互作用为 PAH s生物修复提供了一个有前途的解决方案。

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Biodegradation of pyrene by bacterial consortia: Impact of natural surfactants and iron oxide nanoparticles

Polycyclic aromatic hydrocarbons (PAHs) are potentially hazardous compounds that could cause a severe impact on many ecosystems. They are very challenging to remove using conventional methods due to their hydrophobic nature. However, this issue can be resolved by utilizing surface-active molecules to increase their bioavailability. In this study, pyrene was chosen as the PAH compound to explore its degradability by the effect of individual bacterial strains (Pseudomonas stutzeri NA3 and Acinetobacter baumannii MN3) and mixed consortia (MC) along with natural surfactant derived from Sapindus mukorossi and iron oxide nanoparticles (NPs). Additionally, fatty acids esters, dipeptides, and sugar derivative groups were identified as potent bioactive components of natural surfactants. Various techniques, such as XRD, VSM, TEM, and FE-SEM with EDX, were utilized to characterize the pristine and Fenton-treated iron oxide NPs. The analytical results confirmed that the Fe3O4 crystal phase and spherical-shaped NPs exhibited excellent magnetic properties. The impact of natural surfactants and iron oxide NPs has significantly contributed to the biodegradation process, resulting in a prominent decrease in chemical oxygen demand (COD) levels. Gas chromatography-mass spectrometry (GC-MS) analysis showed that biodegradation systems produced primary hydrocarbon intermediates, which underwent oxidative degradation through Fenton treatment. Interestingly, synthesized iron oxide NPs effectively produced hydroxyl radical (•OH) during the Fenton reaction, which was confirmed by electron paramagnetic resonance (EPR) spectra, and the pristine iron oxide NPs underwent a material transformation observed. The study demonstrated an integrated approach for biodegradation and the Fenton reaction process to enhance the pyrene degradation efficiency (90%) compared to other systems. Using natural surfactants and iron oxide NPs in aquatic environments serves as a crucial platform at the interface of microorganisms and contaminated oil products. This interaction offers a promising solution for PAHs bioremediation.

更新日期：2023-11-24

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