Bacterial electroactivity and viability depends on the carbon nanotube-coated sponge anode used in a microbial fuel cell
Bacterial electroactivity and viability depends on the carbon nanotube-coated sponge anode used in a microbial fuel cell
复制标题
细菌电活性和活力取决于微生物燃料电池中使用的碳纳米管涂层海绵阳极
DOI：
10.1016/j.bioelechem.2018.02.008
复制
发表时间：
2018-08-01
影响因子：
5
通讯作者：
Xu, Ping
中科院分区：
文献类型：
--
作者：
Ma, Hanyue;Xia, Tian;Xu, Ping
阳极材料对于提高微生物燃料电池（MFC）的发电量至关重要。在本研究中，构建了具有大孔结构、高表面积和高电导率的碳纳米管（CNT）涂层海绵作为阳极来封装大肠杆菌K12（E. coll. K12）细胞。为了实现MFC的高发电，海绵上涂覆的CNT的最佳浓度为30 mg·mL(-1)。在此浓度下，在间歇式长时间稳定发电过程中获得了787 W m(-3)的最大功率密度和80.9%的化学需氧量(COD)去除率。这表明CNT（30 mg mL(-1) ）涂覆的海绵上的生物膜具有优异的电活性和稳定性。扫描电子显微镜 (SEM) 图像证实，CNT 涂层海绵为大肠杆菌 K12 细胞提供了合适的微环境，以维持其附着和定植。此外，在发电后还发现了大肠杆菌 K12 细胞的 CNT 依赖性存活现象。大肠杆菌 K12 细胞的这种 CNT 依赖性活力在 -20 摄氏度的奶管中储存一年后保持稳定且可持续。 (C) 2018 Elsevier B.V. 保留所有权利。
The anode material is vital to improve the power generation of a microbial fuel cell (MFC). In this study, a carbon nanotube (CNT)-coated sponge with macro-porous structure, high surface area, and high conductivity was constructed as an anode to encapsulate Escherichia coli K12 (E. coll. K12) cells. To achieve high power generation of the MFC, the optimal concentration of the CNT coating the sponge was found to be 30 mg mL(-1). At this concentration, a maximum power density of 787 W m(-3) and a chemical oxygen demand (COD) removal of 80.9% were obtained with a long stable electricity generation process in batch mode. This indicates that the biofilm on the CNT (30 mg mL(-1) )-coated sponge possessed excellent electroactivity and stability. Scanning electron microscope (SEM) images confirmed that the CNT-coated sponge provided a suitable microenvironment for E. coli K12 cells to maintain their attachment and colonization. Additionally, a CNT-dependent viability phenomenon of the E. coli K12 cells was discovered after electricity generation. This CNT-dependent viability of the E. coli K12 cells was stable and sustainable after storage at -20 degrees C in a milk tube for one year. (C) 2018 Elsevier B.V. All rights reserved.