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首页> 外文期刊>Environmental Science & Technology >Carbon and Steel Surfaces Modified by Leptothrix discophora SP-6: Characterization and Implications
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Carbon and Steel Surfaces Modified by Leptothrix discophora SP-6: Characterization and Implications

机译：Leptothrix discophora SP-6修饰的碳和钢表面：表征和意义

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摘要

Leptothrix discophora SP-6, a type of manganese(Mn)-oxidizing bacteria, has been known to accumulate Mn oxides from the aqueous environment and thus play a key role in microbiologically influenced corrosion by increasing the electrochemical potential of steel and other metals. Similarly, this bacterium was found to modify the surface of glassy carbon in aqueous solution and increase its potential (i.e., ennoblement). In the latter case, biomineralized Mn oxides can be used as cathodic reactants for a new generation of microbial fuel cells featuring a biocathode. In this preliminary study, factors affecting the biofilm formation and biomineralization processes were examined. The inflow of air into the culture medium was found essential to sustain the ennoblement of substrate electrodes. The OCP and FESEM/EDS data indicated that a smoother initial substrate surface generally led to better ennoblement. Polarizing the carbon electrode at +500 mV_(SCE) for 15 min was found to facilitate the ennoblement on carbon electrodes, and so did coating it with a poly(L-lysine) layer. Independent of substrate material, initial surface roughness, and pretreatment, there were three parameters in the EIS equivalent circuit that correlated well with the OCP indicating the level of ennoblement by L discophora SP-6, i.e., electrolyte resistance, double-layer capacitance, and low-frequencies capacitance. These fascinating findings merit further investigation as they may shed light on the fundamental bacteria/substrate interactions and help advance the knowledge base needed for the engineering applications.
机译：Leptothrix discophora SP-6是一种锰（Mn）氧化细菌，已知会从水性环境中积累Mn氧化物，因此通过增加钢和其他金属的电化学势在微生物影响的腐蚀中起关键作用。类似地，发现该细菌修饰水溶液中玻璃状碳的表面并增加其潜力（即，增值）。在后一种情况下，生物矿化的Mn氧化物可用作具有生物阴极的新一代微生物燃料电池的阴极反应物。在这项初步研究中，研究了影响生物膜形成和生物矿化过程的因素。发现空气流入培养基对于维持底物电极的贵重是必不可少的。 OCP和FESEM / EDS数据表明，较光滑的初始基材表面通常会带来更好的增贵效果。发现将碳电极在+500 mV_（SCE）下极化15分钟有助于在碳电极上进行修饰，因此也要在其上涂上聚L-赖氨酸层。与基材材料，初始表面粗糙度和预处理无关，EIS等效电路中有三个与OCP密切相关的参数，它们表明L Discophora SP-6的高贵度，即电解质电阻，双层电容和低频电容。这些令人着迷的发现值得进一步研究，因为它们可以阐明基本细菌/底物之间的相互作用，并有助于提高工程应用所需的知识库。

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  • 来源
    《Environmental Science & Technology》 |2007年第23期|p.7987-7996|共10页
  • 作者

    TUAN ANH NGUYEN; YUZHUO LU; XINGHONG YANG; XIANMING SHI;

  • 作者单位

    Corrosion, Electrochemistry & Analysis Laboratory (CEAL), Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, Montana 59717-4250;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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