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Article Dans Une Revue Journal of Environmental Chemical Engineering Année : 2022

Higher performances of open vs. closed circuit microbial fuel cell sensor for nitrate monitoring in water

Résumé

Microbial fuel cell (MFC) sensor exhibits attractive prospects for real-time monitoring of nitrate (NO 3-) in water, with unique advantages of self-powering and simple structure; but its stability and sensitivity are unsatisfactory. In an attempt to address the limitations, here we employed an open-circuit MFC (O-MFC) sensor for real-time monitoring of NO3 in water, compared to a conventional closed-circuit MFC (C-MFC) sensor. The stability of the O-MFC sensor was confirmed when subject to the continuous fluctuation of interfering substances including organic matter (acetate, 2-20 mM), SO42- (250-400 mg/L) and Fe3+ (0.3-0.6 mg/L). For one-time and continuous monitoring of NO3 at a concentration of 1-40 mg/L, the O-MFC sensor both achieved higher sensitivity than that of the C-MFC sensor; especially at a low NO3 concentration of 1 mg/L, the changes of electrical signal (ΔE) reached 10.0 ± 1.00 mV and 7.0 ± 0.85 mV respectively. In contrast, the C-MFC sensor failed to monitor at low NO3 concentrations of 1 and 5 mg/L. Moreover, good linear correlation between ΔE and NO3 concentration (R2 = 0.907 and 0.981) was obtained from the O-MFC sensor. However, owing to the highly activity of EAB that mainly grows in the outer layer of biofilm, the response time of the O-MFC sensor is too long. Microbial community analysis further revealed that the open-circuit condition is more suitable for NO 3 monitoring in water, providing a new way to improve the performance of MFC sensors.
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Dates et versions

hal-03669616 , version 1 (17-05-2022)

Identifiants

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Zhenxing Ren, Guixia Ji, Hongbo Liu, Ping Li, Jianhong Huang, et al.. Higher performances of open vs. closed circuit microbial fuel cell sensor for nitrate monitoring in water. Journal of Environmental Chemical Engineering, 2022, 10 (3), pp.107807. ⟨10.1016/j.jece.2022.107807⟩. ⟨hal-03669616⟩
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