摘要
利用纳米氧化物强化微生物燃料电池(MFC)处理城市污水,从污水中分离并优化MFC菌种,进而考察了4种纳米氧化物颗粒对MFC发电性能的强化,并改进纳米形态以进一步提高强化性能。结果表明,大肠杆菌较混合菌种发电性能好,大肠杆菌含量为105 CFU/m L,处于对数期时,发电效率最高,纳米氧化物显著提高发电效率300%,纳米颗粒与细菌混合振荡2 h有利于发电效率的提高,以TiO_2为代表制备的纳米线相比纳米颗粒发电效率进一步提高30%。扫描电镜分析表明,纳米颗粒在细胞和电极间构成传递通道,有利于微生物产生电子快速传递到电极,而纳米线相比纳米颗粒可形成更多通道,因而使MFC发电效率提高。该研究可为从纳米材料方面强化MFC发电效率提供参考。
Nano-oxide was used to enhance microbial fuel cells (MFCs) for municipal wastewater treatment. MFC strains were separated and optimized in municipal wastewater then four nano-oxide particles was adopted in MFC to investigate their power generation performances. In addition the improvement of nano oxides morphology was optimized to further enhance the strengthening performance. Results showed that E. coli had better power generation performance than the mixed strains of activated sludge, E. coli performed the highest generation efficiency when the content was 105 Cells/mL, and the growth phase was logarithmic phase, Nano-oxides significantly increased the power generation efficiency by 300%. The pre-mixing of nano-particles and bacteria for 2 h was beneficial for MAC generating power. The power generation could be further increased by 30% when the nano oxides particles were changed to nanowires which prepared by TiO2. Scanning electron microscopy analysis showed that the nano-oxides partices could form many channels between cells and electrodes, which were conducive to the rapid transfer of electron from microbes to the electrodes, and the nanowires could form more channels by comparison, thus further increasing the MFC power generation efficiency. This study can provide reference for enhancing the efficiency of MFC power generation by the adoption of nanomaterials.
作者
王欣婷
杨泽琨
张运海
李静怡
斯敦峰
袁青彬
WANG Xinting;YANG Zekun;ZHANG Yunhai;LI Jingyi;SI Dunfeng;YUAN Qingbin(College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China)
出处
《水处理技术》
CAS
CSCD
北大核心
2019年第1期89-94,共6页
Technology of Water Treatment
基金
国家自然科学基金(51608260)
大学生创新创业训练项目(201710291068Z)
污染控制与资源化研究国家重点实验室开放基金(PCRRF16029)
