文献类型：期刊文献

英文题名：Denitrification performance of ce-doped birnessite modified cathode in bioelectrochemical system

作者：Huang, Guangtuan[1];Zhang, Yichong[1];Qu, Ling[1];Zhang, Lehua[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Natl Engn Lab Ind Wastewater Treatment, Environm Protect Key Lab Environm Risk Assessment, Shanghai 200237, Peoples R China

年份：2020

卷号：871

外文期刊名：JOURNAL OF ELECTROANALYTICAL CHEMISTRY

收录：;EI(收录号：20202408811313);WOS:【SCI-EXPANDED(收录号:WOS:000554922000045)】；

语种：英文

外文关键词：Biocathode; Cathode-modification; Birnessite; Cerium doping; Nitrate removal

摘要：Ce-doped birnessite prepared by electrodeposition was used to modify carbon felt cathodes and biological autotrophic denitrification by Thiobacillus denitrificans was investigated in double-chamber bioelectrochemical systems (BESs). The results showed that T. denitrificans could utilize the cathodes as the direct electron donors for autotrophic denitrification and the nitrate reduction rate increased from 26.85 +/- 2.23 to 54.47 +/- 2.46 mmol NO3--N L(-1)d(-1)m(-2). No ammonia was detected, indicating that dissimilatory nitrate reduction to ammonium (DNRA) did not occur and denitrification was the only pathway for the reduction of nitrate by T. denitrificans biofilm. Surface topography of the cathodes characterized by scanning electron microscopy (SEM) indicated that the cathodes were colonized by biofilms of T. denitrificans which played a crucial role in facilitating electron transfer for nitrate reduction. Cyclic voltammetry (CV) tests suggested that the Ce-doped birnessite modified cathodes enhanced the electrochemical activity of T. denitrificans biofilms and effectively accelerated the nitrate reduction rate. (C) 2020 Elsevier B.V. All rights reserved.