通过直接Fe0-to-Microbe电子转移,通过磁铁和导电性Pili加速微生物腐蚀
Yuting Jin1,2, Enze Zhou1,2, Toshiyuki Ueki1,2
1Electrobiomaterials Institute, Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education), Northeastern University, 110819, Shenyang, China.
Angewandte Chemie (International ed. in English)
|August 1, 2023
概括
微生物使用导电性皮和磁铁来腐蚀铁,加速损坏. 了解这些电生物腐蚀机制可以帮助减轻昂贵的工业金属降解.
科学领域:
- 微生物学 微生物学
- 腐蚀科学 腐蚀科学
- 电化学 电化学 电化学
背景情况:
- 由微生物与金属铁 (Fe0) 之间的直接电气连接驱动的电生物腐蚀,有助于显著的工业腐蚀.
- 电生物腐蚀背后的精确机制仍然不完全理解,这阻碍了有效的缓解策略.
研究的目的:
- 阐明微生物导电性皮利和矿物磁铁在金属铁的电生物腐蚀中由Geobacter sulfurreducens的作用.
- 研究这些组件对电子转移的贡献以及由此产生的腐蚀速率和模式.
主要方法:
- 利用Geobacter sulfurreducens的遗传修饰来改变其 pili (e-pili) 的导电性.
- 研究了磁石对电子转移速率和腐蚀现象的影响.
- 采用突变研究来比较磁铁的作用与外表面的c型细胞染色体OmcS.的作用.
主要成果:
- 发现导电性 pili (e-pili) 对于高效的从Fe0转移到微生物的电子至关重要,导电性降低会减少腐蚀.
- 磁铁显著降低了电子转移阻力,从而增加了腐蚀电流,并加剧了孔.
- 突变研究表明,磁铁石促进电子转移,类似于OmcS细胞染色体.
结论:
- 导电性皮利和磁铁是由Geobacter sulfurreducens对铁的电生物腐蚀的关键参与者.
- 在铁腐蚀过程中形成磁铁可能会产生积极的反循环,加速进一步的电生物腐蚀.
- 了解这些相互作用为检测和潜在地减轻经济上有害的电生物腐蚀过程提供了洞察力.
更多相关视频
相关概念视频
01:18Other Unique Bacteria
35
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
35
01:28Microbial Nutrition
71
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
71
02:49Corrosion
25.1K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
25.1K
01:15Metabolism of Chemolithotrophs
47
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
47
01:27Corrosion of Reinforcement
215
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
215