胞外聚合物
化学
自养
生物膜
结块
阴极
电子转移
氧化还原
污染物
微生物燃料电池
阳极
化学工程
细菌
环境化学
无机化学
光化学
有机化学
电极
生物
工程类
物理化学
遗传学
作者
Chengmei Liao,Qian Zhao,Wang Shu,Xuejun Yan,Tian Li,Lean Zhou,Jingkun An,Yuqing Yan,Nan Li,Xin Wang
标识
DOI:10.1016/j.scitotenv.2021.145767
摘要
Electrotrophic bacteria on cathodes are promising substitutes to precious metals as oxygen reduction reaction catalysts in bioelectrochemical systems (BESs). Leading the anodic effluent to the biocathode has additional benefits of neutralizing pH and removing residual pollutants. However, the overflow of excessive organic pollutants inhibits the activity of autotrophic biocathodes. Adding glucose as an organic shock, we confirm that the startup time of biocathodes is initially prolonged by 1.2 times with a decrease in current. However, the currents inversely surpass the control in glucose-added BESs when the biofilm is mature, and the maximum current density increase by 5.5 times with a relatively stable performance. This increase is mainly attributed to the production of agglomerates dominated by polysaccharides and proteins as extracellular polymeric substances. These agglomerates wrap additional redox shuttles that accelerated the electron transfer between electrotrophic bacteria and the cathode. This study demonstrates for the first time that organic shocks enhance the electroactivity of autotrophic biocathodes and provides insights into the feedback mechanisms of electrotrophic microbial community to environmental changes.
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