微生物燃料电池
生物传感器
适应
微生物
化学
阳极
材料科学
环境化学
电极
细菌
生物
植物
生物化学
遗传学
物理化学
作者
Yazhi Nong,Min Xu,Bing Liu,Jianfeng Li,Dongye He,Chuanfu Li,Ping Lin,Yin Luo,Chenyuan Dang,Jie Fu
出处
期刊:Water Research
[Elsevier]
日期:2024-06-01
卷期号:256: 121566-121566
被引量:4
标识
DOI:10.1016/j.watres.2024.121566
摘要
Microbial fuel cell (MFC) sensing is a promising method for real-time detection of water biotoxicity, however, the low sensing sensitivity limits its application. This study adopted low temperature acclimation as a strategy to enhance the toxicity sensing performance of MFC biosensor. Two types of MFC biosensors were started up at low (10°C) or warm (25°C) temperature, denoted as MFC-Ls and MFC-Ws respectively, using Pb2+ as the toxic substance. MFC-Ls exhibited superior sensing sensitivities towards Pb2+ compared with MFC-Ws at both low (10°C) and warm (25°C) operation temperatures. For example, the inhibition rate of voltage of MFC-Ls was 22.81% with 1 mg/L Pb2+ shock at 10°C, while that of MFC-Ws was only 5.9%. The morphological observation showed the anode biofilm of MFC-Ls had appropriate amount of extracellular polymer substances, thinner thickness (28.95 μm for MFC-Ls and 41.58 μm for MFC-Ws) and higher proportion of living cells (90.65% for MFC-Ls and 86.01% for MFC-Ws) compared to that of MFC-Ws. Microbial analysis indicated the enrichment of psychrophilic electroactive microorganisms and cold-active enzymes as well as their sensitivity to Pb2+ shock was the foundation for the effective operation and good performance of MFC-Ls biosensors. In conclusion, low temperature acclimation of electroactive microorganisms enhanced not only the sensitivity but also the temperature adaptability of MFC biosensors.
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