Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV.
Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV.
复制标题
氧化还原电位低于 650 mV 时，固着嗜酸菌在黄铁矿氧化中的作用有限
DOI：
10.1038/s41598-017-04420-2
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发表时间：
2017-07-10
影响因子：
4.6
通讯作者：
Ruan R
中科院分区：
文献类型：
--
作者：
Liu C;Jia Y;Sun H;Tan Q;Niu X;Leng X;Ruan R
为了研究固着微生物在黄铁矿氧化中的作用，在可控和非可控氧化还原电位条件下，研究了混合中温嗜酸菌对黄铁矿的氧化作用。用扫描电子显微镜(SEM)、激光共聚焦扫描显微镜(CLSM)和原子力显微镜(AFM)表征了微生物通过胞外聚合物(EPS)附着在黄铁矿表面的高覆盖率。如果氧化还原电位控制在650 mV以下(接近黄铁矿的静止电位)，即使细菌活性很高，在黄铁矿表面的覆盖率很高，黄铁矿的溶解也可以忽略不计。然而，在氧化还原电位失控的情况下，随着氧化还原电位的增加，黄铁矿的氧化速率大大增加。研究表明，固着微生物在氧化还原电位低于650 mV时对黄铁矿的氧化作用有限，并强调了溶液氧化还原电位对黄铁矿氧化的重要性。这对生物冶金实践中的酸性矿山废水控制和黄铁矿氧化控制具有一定的指导意义。
Pyrite oxidation by mixed mesophilic acidophiles was conducted under conditions of controlled and non-controlled redox potential to investigate the role of sessile microbes in pyrite oxidation. Microbes attached on pyrite surfaces by extracellular polymeric substances (EPS), and their high coverage rate was characterized by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). The dissolution of pyrite was negligible if the redox potential was controlled below 650 mV (near the rest potential of pyrite), even though the bacteria were highly active and a high coverage rate was observed on pyrite surfaces. However, with un-controlled redox potential the rate of pyrite oxidation increased greatly with an increasing redox potential. This study demonstrates that sessile microbes play a limited role in pyrite oxidation at a redox potential below 650 mV, and highlight the importance of solution redox potential for pyrite oxidation. This has implications for acid mine drainage control and pyrite oxidation control in biometallurgy practice.
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