Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Bioresour Technol. 2015 Feb;177:74-9. doi: 10.1016/j.biortech.2014.11.065. Epub 2014 Nov 21.
Excellent perchlorate reduction was obtained under various initial concentrations in a non-membrane microbial electrolysis cell with polyaniline (PANI) modified graphite cathode as sole electron donor. PANI modification is conducive to the formation of biofilm due to its porous structure and good electrocatalytic performance. Compared with cathode without biofilm, over 12% higher reduction rates were acquired in the presence of biocathode. The study demonstrates that, instead of perchlorate reduction, the main contribution of biofilm is involved in facilitate electron transfer from cathode to electrolyte. Interestingly, hairlike structure, referred as to pili-like, was observed in the biofilm as well as in the electrolyte. Additionally, the results show that pili were prone to formation under the condition of external electron field as sole electron donor. Analysis of microbial community suggests that perchlorate reduction bacteria community was most consistent with Azospiraoryzae strain DSM 13638 in the subdivision of the class Proteobacteria.
在非膜微生物电解池中，聚苯胺（PANI）修饰石墨阴极作为唯一的电子供体，在各种初始浓度下都能获得优异的高氯酸盐还原效果。PANI 修饰由于其多孔结构和良好的电催化性能有利于生物膜的形成。与没有生物膜的阴极相比，在生物阴极存在的情况下，还原率提高了 12%以上。研究表明，生物膜的主要作用不是还原高氯酸盐，而是促进电子从阴极向电解质转移。有趣的是，在生物膜和电解质中都观察到了类似毛发的结构，称为菌毛状结构。此外，结果表明，在作为唯一电子供体的外加电子场条件下，菌毛容易形成。微生物群落分析表明，高氯酸盐还原菌群落与变形菌门的 Azospiraoryzae 菌株 DSM 13638 在亚纲分类中最为一致。
