硅烷偶联剂修饰MFC阳极及其电池性能的研究

Study on Modifying MFC Anode with Silane Coupling Agents( SCAs)

以碳毡为基础电极材料,使用新型有机材料硅烷偶联剂(KH550、KH580和KH792)修饰MFC的阳极,分析其对MFC产电性能和电极生物膜菌群结构的影响,旨在探讨电极修饰材料、电池性能和电极生物膜三者之间的关系。试验结果表明,带氨基的KH550和KH792能够有效提升MFC的产电性能,其功率密度可分别提高50%和28.5%。而带巯基的KH580不能提升MFC的产电性能,还减缓了启动速度。电极生物膜的群落分析结果表明,阳极生物膜(无论修饰前还是修饰后)的主要微生物群落为变形菌(Proteobacteria)和厚壁菌(Firmicutes)。经过修饰后,电极上的菌群结构发生了变化,其生物多样性高于修饰前,且这种变化主要来自电极材料对微生物吸附效果的差异。此外,硅烷偶联剂的分子结构和电极上微生物菌群结构表明,材料的官能团对于电极生物膜菌群结构的影响大于烷基链。

Using carbon felt as the basic electrode material, three silane coupling agents （SCAs）, namely KH550, KH580, and KH792, were used to modify the anodes of MFC, and the influence on the MFC performance was investigated. This paper focused on the relationships among the electrode material, MFC performance, and the biodiversity of electrode biofilm. The amino-SCAs （ KH550 and KH792） ef- fectively improved the MFC performance, and the power densities were increased by 50% and 28.5% re- spectively. However, the sulfydryl-SCA KH580 did not improve the MFC performance, but slowed down the startup speed. According to the microbial communities analysis, the predominated phyla were Pro- teobacteria and Firmicutes on all anodes. After the modifications, the anode biodiversity was increased, which was due to the difference in the adsorption of bacteria on anode materials. Furthermore, in view of the structure of the SCA materials and the anode biodiversity, functional groups determined the biodiver- sity variation stronger than the alkyl chains.