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研究了材料表面电荷对硫酸盐还原菌(SRB)初始附着行为的影响。分别将6-胺基-1-己烷硫醇,6-巯基-1-己醇和6-巯基己酸修饰在Au电极表面,形成不同荷电状态的自组装膜(SAMs)。用电化学阻抗(EIS)和扫描电子显微镜(SEM)监测SRB在3种SAMs表面的附着。结果表明,荷正电的SAMs表面有利于SRB的初期附着,而荷负电的SAMs表面则会抑制SRB初期附着并使其可逆附着过程的时间延长。另外,3种表面的电荷转移电阻变化率(△Rct%)可在一定程度上反映SRB的初期附着情况。
The effect of surface charge of material on the initial attachment of sulfate-reducing bacteria (SRB) was investigated. 6-Amino-1-hexanethiol, 6-mercapto-1-hexanol and 6-mercaptohexanoic acid were modified on the surface of Au electrode to form self-assembled monolayers (SAMs) with different states of charge. Electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were used to monitor the attachment of SRB on the surface of the three SAMs. The results showed that the positive SAMs surface favored the initial attachment of SRB while the negative SAMs surface inhibited the initial attachment of SRB and prolonged the reversible attachment process. In addition, the rate of change of charge transfer resistance (ΔRct%) of the three kinds of surfaces can reflect the initial attachment of SRB to some extent.