Biogenic Mn2O3 via the redox of Shewanella oneidensis MR-1 for peroxymonosulfate advanced oxidation
Biogenic Mn2O3 via the redox of Shewanella oneidensis MR-1 for peroxymonosulfate advanced oxidation
复制标题
通过 Shewanella oneidensis MR-1 的氧化还原实现过一硫酸盐高级氧化的生物源 Mn2O3
DOI：
10.1016/j.seppur.2022.122144
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发表时间：
2022
影响因子：
8.6
通讯作者：
Li Xianning
中科院分区：
文献类型：
--
作者：
Long Xizi;Zhang Hongrui;Cao Xian;Wang Hui;Shimokawa Kohei;Chi Huimei;Zhang Chengming;Okamoto Akihiro;Li Xianning
Shewanella oneidensis MR-1 (MR-1) 氧化锰 (II) 强调了锰纳米粒子合成的新途径。然而，锰氧化的机制和生物产物的组成仍然未知。在此，我们发现了 Mn(II) 氧化成 Mn2O3 纳米颗粒的过程，并且是由细胞色素还原酶复合物 III 驱动的。根据转录组分析，编码复合物III的基因在Mn(II)氧化过程中上调，对应于突变体ΔpetC和ΔpetA（复合物III亚基）的无能力。 Mn2O3颗粒的形貌和活性进一步受到MR-1细胞外电子转移的控制，伴随着形状从纳米颗粒到纳米片的变化，具有更强的电子转移能力，最终通过有效激活过一硫酸盐自由基氧化，使尼泊金甲酯的降解率提高1.5倍。我们的工作提供了对锰氧化机制和生物源锰的修饰以去除污染物的见解。
The manganese Mn(II) oxidizing byShewanella oneidensisMR-1 (MR-1) underlines a new pathway for Mn nanoparticle synthesis. However, the mechanism of Mn oxidizing and the compositions of biogenic products remain unknown. Here, the oxidation of Mn(II) to Mn2O3nanoparticles was discovered, and was to be driven by cytochromecreductase Complex III. According to the transcriptomic analysis, genes encoding Complex III were upregulated during the Mn(II) oxidizing process, corresponding to the inability of mutantsΔpetCandΔpetA(Complex III subunits). The morphology and activity of Mn2O3particles were further controlled by the extracellular electron transfer of MR-1, associated with the change of the shape from nanoparticle to nanosheet and with stronger electron transfer ability, and eventually led to a 1.5-fold higher methylparaben degradation rate by activating peroxymonosulfate radical oxidizing effectively. Our work provides insights into the Mn-oxidizing mechanism and modification of biogenic Mn for pollutant removal.