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细菌和碳质材料之间的物理接触:关键开关触发活性碳和生物炭,以促进微生物铁的减少

Lin Shen^1,2,3, Xiao Zhu^1,2,3, Haoze Jiang⁴

¹Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.

Environmental science & technology

|April 10, 2025

概括

碳质材料可以促进或抑制微生物的铁减少. 关键是氧化铁如何聚合在碳表面,影响细菌接触和电子转移.

科学领域:

环境微生物学环境微生物学
地质化学地质化学
材料科学材料科学材料科学

背景情况:

像活性炭这样的碳质材料是微生物Fe (III) 减少的已知的电子穿.
最近的研究显示了相互矛盾的结果,其中一些表明抑制作用,引发了争论.

研究的目的:

研究物理接触和聚合物结构在碳介导微生物Fe (III) 减少中的关键作用.
解决关于碳酸性材料是否促进或抑制Fe (III) 矿物减少的争论.

主要方法:

使用的系统中含有*Shewanella oneidensis* MR-1,活性炭和化.
改变了活性碳与铁氧化物比率 (C/Fe),以控制聚合物结构.
在不同的微观结构条件下分析了Fe(III) 减少动力学.

主要成果:

低的C/Fe比率 (5:7) 导致铁酸盐的碳封装,抑制了Fe (III) 的降解.
高的C/Fe比率 (100:7) 导致铁化物分散在碳上,增强了Fe (III) 的降解率和程度.
铁氧化物在11种不同的碳状材料上的微观结构批判性地确定了Fe (III) 的降解率.

结论:

氧化铁在碳表面的物理排列决定了碳酸性材料是否促进或抑制微生物Fe (III) 减少.
这一发现澄清了碳在生物地球化学过程和环境修复中的作用.

关键词:

在Fe (III) 降解过程中活性炭活性炭的使用方法聚合物结构的聚合物结构.细胞外电子转移细胞外电子转移热溶性碳是碳中的一种.

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