Optimal set of electrode potential enhances the toxicity response of biocathode to formaldehyde

Liao, Chengmei; Wu, Jiali; Zhou, Lean; Li, Tian; Du, Qing; An, Jingkun; Li, Nan; Wang, Xin

doi:10.1016/j.scitotenv.2018.07.114

Cited by 42 publications

(19 citation statements)

References 47 publications

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“…whit high content of quinone that could be involved in electron transfer to multi-heme c-type cytochromes that have a key role in External Electron Transfer (EET) to electrodes and minerals [12]. The sharp increase in relative abundances of this genus on the polarized bioelectrode, as well as in other electroactive biocathodic communities, as reported in the literature [70,71], may suggest this genus is involved in the transfer of electrons from an electrode. However, to date, there has been no research that has pointed out the Moheibacter is directly implicated in EET.…”

Section: Microbial Communitiesmentioning

confidence: 76%

Microbial Assisted Hexavalent Chromium Removal in Bioelectrochemical Systems

Beretta

Daghio

Espinoza-Tofalos

et al. 2020

Water

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Groundwater is the environmental matrix that is most frequently affected by anthropogenic hexavalent chromium contamination. Due to its carcinogenicity, Cr(VI) has to be removed, using environmental-friendly and economically sustainable remediation technologies. BioElectrochemical Systems (BESs), applied to bioremediation, thereby offering a promising alternative to traditional bioremediation techniques, without affecting the natural groundwater conditions. Some bacterial families are capable of oxidizing and/or reducing a solid electrode obtaining an energetic advantage for their own growth. In the present study, we assessed the possibility of stimulating bioelectrochemical reduction of Cr(VI) in a dual-chamber polarized system using an electrode as the sole energy source. To develop an electroactive microbial community three electrodes were, at first, inserted into the anodic compartment of a dual-chamber microbial fuel cell, and inoculated with sludge from an anaerobic digester. After a period of acclimation, one electrode was transferred into a polarized system and it was fixed at −0.3 V (versus standard hydrogen electrode, SHE), to promote the reduction of 1000 µg Cr(VI) L−1. A second electrode, served for the set-up of an open circuit control, operated in parallel. Cr(VI) dissolved concentration was analysed at the initial, during the experiment and final time by spectrophotometric method. Initial and final microbial characterization of the communities enriched in polarized system and open circuit control was performed by 16S rRNA gene sequencing. The bioelectrode set at −0.3 V showed high Cr(VI) removal efficiency (up to 93%) and about 150 µg L−1 day−1 removal rate. Similar efficiency was observed in the open circuit (OC) even at about half rate. Whereas, purely electrochemical reduction, limited to 35%, due to neutral operating conditions. These results suggest that bioelectrochemical Cr(VI) removal by polarized electrode offers a promising new and sustainable approach to the treatment of groundwater Cr(VI) plumes, deserving further research.

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Section: Microbial Communitiesmentioning

confidence: 76%

Microbial Assisted Hexavalent Chromium Removal in Bioelectrochemical Systems

Beretta

Daghio

Espinoza-Tofalos

et al. 2020

Water

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“…Low values of R ext force high current signals that can respond faster to the impact of a toxicant on the activity of the anodic biolm. 51,52 R ext should be optimised on the basis of the type of toxicant, bacterial population and MFC design. For example, a recent study showed that the largest IR value for Cd 2+ and Pb 2+ was obtained under a R ext of 680 U, while for the detection of the pesticide Avermectin, the optimal R ext was 100 U.…”

Section: Sensitivitymentioning

confidence: 99%

“…The sensitivity of a biocathode to formaldehyde enriched at À0.2 V vs. Ag/AgCl was signicantly superior than at 0 and À0.4 V vs. Ag/AgCl, which was attributed to a selective growth of Nitrospirae at À0.2 V over more diverse community at other potentials. 52 It is expected that prolonged exposure to toxicants exerts a selective pressure on the microbial community towards toxicant tolerant organisms, thus reducing the sensitivity of the sensor. 54 Aer repeated shocks of 4-nonylphenol, a shi in the community towards toxicant tolerant bacteria was observed; the non-electrogenic degradation of 4-nonylphenol increased from 15 to 47%, and the sensitivity of the MFC sensor reduced over time.…”

Section: Sensitivitymentioning

confidence: 99%

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Microbial fuel cells for in-field water quality monitoring

Olias

Lorenzo

2021

RSC Adv.

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“…These trends can be detected by reducing the magnitude of the signal in steady state conditions. Normalising the signal by its baseline narrows the output range from 0 to 1 and enhances the sensitivity of the sensor [30]. The effect of the electrode material in the signal output is relatively low.…”

Section: Evaluation Of Relevant Factors On Csmfc Performancementioning

confidence: 99%

Ceramic Soil Microbial Fuel Cells Sensors for Early Detection of Eutrophication

Olias

Otero

Cameron

et al. 2020

The 1st International Electronic Conference on Biosensors

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The increasing use of fertilisers rises the risk of eutrophication, a sudden algal bloom that seriously damage ecosystems due to critical oxygen depletion. Continuous monitoring of oxygen in environmental waters could improve the detection of eutrophication and prevent anoxic conditions. However, online and in situ dissolved oxygen sensors are yet to be implemented due to poor portability and power requirements. Here, we propose a ceramic soil microbial fuel cell as a selfpowered sensor for algal growth detection via monitoring of dissolved oxygen in water. The sensor signal follows the characteristic photosynthetic cycle, with a maximum day current of 0.18 ± 0.2 mA and a minimum night current of 0.06 ± 0.34 mA, which correlates with dissolved oxygen (R 2 = 0.85 (day); R 2 = 0.5 (night)) and algal concentration (R 2 = 0.63). A saturated design of experiments on seven factors suggests that temperature, dissolved oxygen, nitrates and pH are most influential operational factors in the voltage output. Moreover, operating the system at maximum power point (Rext = 2 kΩ) improves the sensor sensitivity. To the best of our knowledge, this is the first proposed MFC-based biosensor for in field, early detection of eutrophic events.

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Optimal set of electrode potential enhances the toxicity response of biocathode to formaldehyde

Cited by 42 publications

References 47 publications

Microbial Assisted Hexavalent Chromium Removal in Bioelectrochemical Systems

Microbial Assisted Hexavalent Chromium Removal in Bioelectrochemical Systems

Microbial fuel cells for in-field water quality monitoring

Ceramic Soil Microbial Fuel Cells Sensors for Early Detection of Eutrophication

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