40 results on '"Liang, Peng"'
Search Results
2. Biological capacitance studies of anodes in microbial fuel cells using electrochemical impedance spectroscopy
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Lu, Zhihao, Girguis, Peter, Liang, Peng, Shi, Haifeng, Huang, Guangtuan, Cai, Lankun, and Zhang, Lehua
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- 2015
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3. Electricity generation from glucose by a Klebsiella sp. in microbial fuel cells
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Xia, Xue, Cao, Xiao-xin, Liang, Peng, Huang, Xia, Yang, Su-ping, and Zhao, Gen-gui
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- 2010
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4. A mini-microbial fuel cell for voltage testing of exoelectrogenic bacteria
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Cao, Xiaoxin, Huang, Xia, Zhang, Xiaoyuan, Liang, Peng, and Fan, Mingzhi
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- 2009
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5. Composition and distribution of internal resistance in three types of microbial fuel cells
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Liang, Peng, Huang, Xia, Fan, Ming-Zhi, Cao, Xiao-Xin, and Wang, Cheng
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- 2007
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6. Evaluation of electricity production from paper industry wastewater by Cellulomonas iranensis LZ-P1 isolated from giant panda
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Pu Liu, Xiangkai Li, Liang Peng, Rong Xu, Zhengsheng Yu, Huawen Han, Kai Zhang, Shangxian Xie, and Shuai Zhao
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Microbial fuel cell ,biology ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Strategy and Management ,05 social sciences ,02 engineering and technology ,Cellulase ,16S ribosomal RNA ,Industrial and Manufacturing Engineering ,Waste treatment ,chemistry.chemical_compound ,Wastewater ,chemistry ,Cellulosic ethanol ,050501 criminology ,0202 electrical engineering, electronic engineering, information engineering ,biology.protein ,Extracellular ,Food science ,Cellulose ,0505 law ,General Environmental Science - Abstract
Microbial fuel cell (MFC) is considered to be a sustainable technology for cellulosic waste treatment and energy recovery; however, studies on cellulose-degrading exoelectrogens are scarce. Giant panda gut microbiota may provide potential cellulose-degrading exoelectrogens due to consumption of high-fiber diet. In this study, strain LZ-P1 isolated from giant panda gut simultaneously showed cellulose-degrading and electricity-generating characteristics. 16S rRNA gene sequence revealed 99% homology with Cellulomonas iranensis. Results showed that the strain generated 1.08 U/mL endoglucanase and 180 mV electricity when cellulose was used as the sole carbon source. Genome sequence confirmed that strain LZ-P1 possessed complete cellulose degradation and extracellular electron transfer pathways. Proteomic analysis further confirmed that the enzymes involved in cellulose-degradation and extracellular electron transport were remarkably up-regulated, including endoglucanases, riboflavin biosynthesis protein, and cytochrome C oxidase. When strain LZ-P1 was applied to MFC-mediated paper recycling wastewater treatment, a maximum power density of 44.05 mW/m2 and 8.72% coulombic efficiency were recovered in 72 h. Therefore, strain LZ-P1 would be a potential candidate for cellulosic waste management and energy recovery.
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- 2021
7. One-year operation of 1000-L modularized microbial fuel cell for municipal wastewater treatment.
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Liang, Peng, Duan, Rui, Jiang, Yong, Zhang, Xiaoyuan, Qiu, Yong, and Huang, Xia
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SEWAGE disposal plants , *SEWAGE purification , *MICROBIAL fuel cells , *MICROBIAL biotechnology , *WATER purification - Abstract
This study constructed a 1000 L modularized MFC system, the largest volume so far, to treat practical municipal wastewater. This MFC system was operated under two different water flow connections in two municipal wastewater treatment plants (MWTP) for more than one year to test their treating abilities for wastewater with both low (average 80 mg L −1 ) and high initial COD concentration (average 250 mg L −1 ). The COD concentration in the effluent from the MFC system remained below 50 mg L −1 with a removal rate of 70–90%, which stably met the level A of the first class in discharge standard of pollutants for MWTP of China. A maximum power density of 125 W m −3 (7.58 W m −2 ) was generated when the MFC system was fed with artificial wastewater, while it lay in a range of 7–60 W m −3 (0.42–3.64 W m −2 ) when treating municipal wastewater. The energy recovery of 0.033 ± 0.005 kWh per m 3 of municipal wastewater was achieved, with a hydraulic retention time (HRT) of 2 h. [ABSTRACT FROM AUTHOR]
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- 2018
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8. Stimulated electron transfer inside electroactive biofilm by magnetite for increased performance microbial fuel cell.
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Liu, Panpan, Liang, Peng, Jiang, Yong, Hao, Wen, Miao, Bo, Wang, Donglin, and Huang, Xia
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PERFORMANCE of microbial fuel cells , *CHARGE exchange , *ELECTROACTIVE substances , *MAGNETITE , *BIOFILMS - Abstract
Inefficient extracellular electron transfer within bioanode leads to low current production by microbial fuel cell (MFC). In this study, magnetite was sprinkled in electroactive biofilm with the aid of magnet field. Magnetite located inside biofilm (interior-doped biofilm) facilitated the electron delivery of electroactive bacteria far away from electrode surface. Electron transfer efficiency was improved by 12% and 37% compared with that of biofilms with magnetite located at the interface of biofilm/electrode (surface-doped biofilm) and that without any magnetite (control biofilm) respectively. The output power density of MFC with interior-doped biofilm (764 ± 32 mW m −2 ) was greatly increased compared with that of MFCs with surface-doped biofilm (604 ± 22 mW m −2 ) and control biofilm (475 ± 12 mW m −2 ). SEM images showed that magnetite evenly distributed inside the interior-doped biofilm and penetrated the electroactive biofilm, which would facilitate extracellular electron transfer across electroactive biofilms and thus improving the bioelectricity production. [ABSTRACT FROM AUTHOR]
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- 2018
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9. A novel microbial fuel cell sensor with biocathode sensing element.
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Jiang, Yong, Liang, Peng, Liu, Panpan, Wang, Donglin, Miao, Bo, and Huang, Xia
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MICROBIAL fuel cells , *CATHODES , *OXYGEN reduction , *FORMALDEHYDE , *DISSOLVED oxygen in water - Abstract
The traditional microbial fuel cell (MFC) sensor with bioanode as sensing element delivers limited sensitivity to toxicity monitoring, restricted application to only anaerobic and organic rich water body, and increased potential fault warning to the combined shock of organic matter/toxicity. In this study, the biocathode for oxygen reduction reaction was employed for the first time as the sensing element in MFC sensor for toxicity monitoring. The results shown that the sensitivity of MFC sensor with biocathode sensing element (7.4±2.0 to 67.5±4.0 mA% −1 cm −2 ) was much greater than that showed by bioanode sensing element (3.4±1.5 to 5.5±0.7 mA% −1 cm −2 ). The biocathode sensing element achieved the lowest detection limit reported to date using MFC sensor for formaldehyde detection (0.0005%), while the bioanode was more applicable for higher concentration (>0.0025%). There was a quicker response of biocathode sensing element with the increase of conductivity and dissolved oxygen (DO). The biocathode sensing element made the MFC sensor directly applied to clean water body monitoring, e.g., drinking water and reclaimed water, without the amending of background organic matter, and it also decreased the warning failure when challenged by a combined shock of organic matter/toxicity. [ABSTRACT FROM AUTHOR]
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- 2017
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10. A cathode-shared microbial fuel cell sensor array for water alert system.
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Jiang, Yong, Liang, Peng, Liu, Panpan, Yan, Xiaoxu, Bian, Yanhong, and Huang, Xia
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MICROBIAL fuel cells , *BIOSENSORS , *CATHODES , *SIGNAL theory , *DUAL water systems - Abstract
The use of biosensors for water alert system is critical for providing safe water to the general public. A cathode-shared microbial fuel cell (MFC) sensor array was designed improve the detection credibility by eliminating the cathode performance variation, based on the principle that only the bioanode would be used as the sensing and transducing element. Four integrated MFCs exhibited high parallelism, and independence without the cross contamination or electric signal interference. Two linear ranges were observed (from 0.25 to 0.75 mM and from 1 to 10 mM) for acetate detection. A linear relationship between inhibition ratio ( IR ) and Cu 2+ concentration from 2 to 6 mg/L was recorded. The sensor expressed an immediate voltage decrease when exposed to a pH decrease from 6 to 4. The compact design of the cathode-shared MFC sensor array assure the detection credibility, and the number of the integrated MFC sensors is alterable based on the monitoring requirement. [ABSTRACT FROM AUTHOR]
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- 2017
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11. Performance enhancement of microbial fuel cell by applying transient-state regulation.
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Liang, Peng, Zhang, Changyong, Jiang, Yong, Bian, Yanhong, Zhang, Helan, Sun, Xueliang, Yang, Xufei, Zhang, Xiaoyuan, and Huang, Xia
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PERFORMANCE of microbial fuel cells , *ELECTROCHEMICAL electrodes , *GRAPHENE oxide , *SURFACE coatings , *ELECTRIC power production , *CURRENT density (Electromagnetism) - Abstract
A binder-free, pseudocapacitive anode was fabricated by coating reduced graphene oxide (rGO) and manganese oxide (MnO 2 ) nanoparticles on stainless steel fibre felt (SS). Microbial fuel cell (MFC) equipped with this novel anode yielded a maximum power density of 1045 mW m −2 , 20 times higher than that of a similar MFC with a bare SS anode (46 mW m −2 ). Transient-state regulation (TSR) was implemented to further improve the MFC’s power generation. The optimal TSR duty cycle ranged from 67% to 95%, and the MFC’s power density increased with TSR frequency. A maximum power density output of 1238 mW m −2 was achieved at the TSR duty cycle of 75% and the frequency of 1 Hz, 18.4% greater than that obtained from the steady state operation. The TSR mode delivered better MFC performance especially when the external resistance was small. Long-term operation tests revealed that the current density and power density yielded in the TSR mode were on average 15.0% and 32.7% greater than those in the steady state mode, respectively. The TSR mode was believed to reduce the internal resistance of the MFC while enhance substrate mass transfer and electron transfer within the anode matrix, thereby improving the MFC performance. [ABSTRACT FROM AUTHOR]
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- 2017
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12. Binder-free graphene and manganese oxide coated carbon felt anode for high-performance microbial fuel cell.
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Zhang, Changyong, Liang, Peng, Yang, Xufei, Jiang, Yong, Bian, Yanhong, Chen, Chengmeng, Zhang, Xiaoyuan, and Huang, Xia
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MICROBIAL fuel cells , *GRAPHENE oxide , *MANGANESE oxides , *BINDING agents , *SURFACE coatings , *ANODES , *ELECTRIC conductivity - Abstract
A novel anode was developed by coating reduced graphene oxide (rGO) and manganese oxide (MnO 2 ) composite on the carbon felt (CF) surface. With a large surface area and excellent electrical conductivity, this binder-free anode was found to effectively enhance the enrichment and growth of electrochemically active bacteria and facilitate the extracellular electron transfer from the bacteria to the anode. A microbial fuel cell (MFC) equipped with the rGO/MnO 2 /CF anode delivered a maximum power density of 2065 mW m −2 , 154% higher than that with a bare CF anode. The internal resistance of the MFC with this novel anode was 79 Ω, 66% lower than the regular one's (234 Ω). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses affirmed that the rGO/MnO 2 composite significantly increased the anodic reaction rates and facilitated the electron transfer from the bacteria to the anode. The findings from this study suggest that the rGO/MnO 2 /CF anode, fabricated via a simple dip-coating and electro-deposition process, could be a promising anode material for high-performance MFC applications. [ABSTRACT FROM AUTHOR]
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- 2016
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13. Enhancing the response of microbial fuel cell based toxicity sensors to Cu(II) with the applying of flow-through electrodes and controlled anode potentials.
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Jiang, Yong, Liang, Peng, Zhang, Changyong, Bian, Yanhong, Yang, Xufei, Huang, Xia, and Girguis, Peter R.
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MICROBIAL fuel cells , *TOXICITY testing , *CHEMICAL detectors , *COPPER compounds , *ELECTRODES , *ANODES , *ELECTRIC potential - Abstract
The application of microbial fuel cell (MFC)-based toxicity sensors to real-world water monitoring is partly impeded by the limited sensitivity. To address this limitation, this study optimized the flow configurations and the control modes. Results revealed that the sensitivity increased by ∼15–41 times with the applying of a flow-through anode, compared to those with a flow-by anode. The sensors operated in the controlled anode potential (CP) mode delivered better sensitivity than those operated in the constant external resistance (ER) mode over a broad range of anode potentials from −0.41 V to +0.1 V. Electrodeposition of Cu(II) was found to bias the toxicity measurement at low anode potentials. The optimal anode potential was approximately −0.15 V, at which the sensor achieved an unbiased measurement of toxicity and the highest sensitivity. This value was greater than those required for electrodeposition while smaller than those for power overshoot. [ABSTRACT FROM AUTHOR]
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- 2015
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14. Influence of circuit arrangement on the performance of a microbial fuel cell driven capacitive deionization (MFC-CDI) system.
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Liang, Peng, Yuan, Lulu, Yang, Xufei, and Huang, Xia
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MICROBIAL fuel cells , *DEIONIZATION of water , *ORGANIC compounds removal (Sewage purification) , *SALINITY , *REFUSE as fuel - Abstract
Using microbial fuel cells (MFCs) to power a capacitive deionization (CDI) process enables simultaneous removal of salinity and organic matter in wastewater. The desalination performance of an MFC-CDI system can be influenced by not only the capacity of individual components but also the arrangement and operation of the MFC-CDI circuit. Five typical circuits (consisting of serial- or parallel-connected MFCs or CDIs) and two ion-desorption modes (short-circuit and reverse-voltage desorption) were compared. Results showed that the MFC-CDI system could be reasonably modeled (R 2 > 0.967) by a first-order resistor–capacitor circuit. The optimal arrangement of the MFC-CDI circuit depended on the electrical characteristics of selected MFCs and CDIs as well as operating conditions. When the system was powered by two MFCs of a larger internal resistance (146 Ω), the highest salt removal after 60 min ( m 60 ; 7.5 mg) was achieved by paralleling the two MFCs; with MFCs of a smaller resistance (12 Ω) being used, the highest m 60 (16.5 mg) was obtained when the two MFCs were connected in series. Further analysis revealed that the MFC's internal resistance and open-circuit voltage, along with the CDI's internal resistance and capacitance, were the chief factors affecting the charge transfer and accordingly desalination on the CDI electrodes. [ABSTRACT FROM AUTHOR]
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- 2015
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15. Enhanced performance of microbial fuel cell at low substrate concentrations by adsorptive anode.
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Wu, Shijia, Liang, Peng, Zhang, Changyong, Li, Hui, Zuo, Kuichang, and Huang, Xia
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PERFORMANCE of microbial fuel cells , *ADSORPTION (Chemistry) , *ANODES , *ACTIVATED carbon , *MASS transfer , *DIFFUSION - Abstract
In this study, a microbial fuel cell (MFC) with granular activated carbon packed anode (GAC-MFC) is developed and compared with a MFC with granular graphite packed anode (GG-MFC), to evaluate the adsorptive effect of the granular activated carbon anode on MFC’s performance. The current output of GAC-MFC (11.1 mA, 18.1 mA and 21.6 mA) is much higher than that of GG-MFC (4.87 mA, 12.5 mA and 17.9 mA) at low substrate COD concentrations (∼50, ∼100 and ∼200 mg/L) when a low external resistance (20 Ω) and high circulation flow rate (20 mL/min) are applied. The half-saturation constant ( K s ) of GAC-MFC is about half as much as that of GG-MFC, suggesting that GAC-MFC has more affinity for anode substrate and deliver better kinetic performance than GG-MFC. Internal resistance distribution shows that mass diffusion resistance of GAC-MFC is at least 50% lower than that of GG-MFC when the substrate COD is ∼50 mg/L, indicating that the adsorptive effect of granular activated carbon packed anode helps to effectively facilitate mass transfer at low COD concentrations. Otherwise, the substrates adsorbed on GAC surface also serve to buffer the impact of COD concentration plummeting in bulk solution. [ABSTRACT FROM AUTHOR]
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- 2015
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16. Enhanced power generation of microbial fuel cell using manganese dioxide-coated anode in flow-through mode.
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Zhang, Changyong, Liang, Peng, Jiang, Yong, and Huang, Xia
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ELECTRIC power production , *MICROBIAL fuel cells , *MANGANESE dioxide electrodes , *METAL coating , *MICROFABRICATION , *ELECTROFORMING - Abstract
A novel anode is fabricated by electrodepositing manganese dioxide (MnO 2 ) on carbon felt to promote MFC's power production. Compared to the bare carbon felt anode, when the electrodeposition time increases to 60 min, the anode capacitance improves 46 times. The maximum power density of the MFC with the MnO 2 -coated anode reaches 3580 ± 130 mW m −2 , 24.7% higher than that with the bare carbon felt anode (2870 mW m −2 ). MnO 2 is believed to facilitate extracellular electron transfer and accordingly improve the power output. Three anode substrate circulation modes, i.e., flow-through, side-flow, and no-flow, are applied. Electrochemical impedance spectroscopy (EIS) tests reveal that flow-through mode decreases the anode mass transfer resistance by 41.4% compared to the no-flow mode and contributes to the MFC's power production improvement. [ABSTRACT FROM AUTHOR]
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- 2015
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17. Enhanced performance of bio-cathode microbial fuel cells with the applying of transient-state operation modes.
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Liang, Peng, Yuan, Lulu, Wu, Wenlong, Yang, Xufei, and Huang, Xia
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MICROBIAL fuel cells , *PERFORMANCE evaluation , *TRANSIENT analysis , *DENITRIFICATION , *WASTEWATER treatment , *MICROBIAL biotechnology - Abstract
Highlights: [•] The ACD and IC modes enhanced the MFC’s power generation and denitrification. [•] The ACD and IC modes were better adapted to treat low-concentration wastewater. [•] The MFC’s power generation was limited by COD rather than nitrate concentration. [•] The ACD and IC modes might enhance substrate transfer within and/or near biofilms. [Copyright &y& Elsevier]
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- 2013
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18. Using a glass fiber separator in a single-chamber air-cathode microbial fuel cell shortens start-up time and improves anode performance at ambient and mesophilic temperatures
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Zhang, Xiaoyuan, Liang, Peng, Shi, Juan, Wei, Jincheng, and Huang, Xia
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GLASS fibers , *SEPARATION (Technology) , *CATHODES , *MICROBIAL fuel cells , *FUEL cell electrodes , *PERFORMANCE evaluation , *ENERGY consumption - Abstract
Abstract: A shorter start-up time and highly negative anode potentials are needed to improve single-chamber air-cathode microbial fuel cells (MFCs). Using a glass fiber separator reduced the start-up time from 10d to 8d at 20°C, and from 4d to 2d at 30°C, and enhanced coulombic efficiency (CE) from <60% to 89% (20°C) and 87% (30°C). Separators also reduced anode potentials by 20–190mV, charge transfer resistances by 76% (20°C) and 19% (30°C), and increased CV peak currents by 24% (20°C) and 8% (30°C) and the potential range for redox activity (−0.55 to 0.10mV vs. −0.49 to −0.24mV at 20°C). Using a glass fiber separator in an air-cathode MFC, combined with inoculation at a mesophilic temperature, are excellent strategies to shorten start-up time and to enhance anode performance and CE. [Copyright &y& Elsevier]
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- 2013
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19. Carbon nanotube powders as electrode modifier to enhance the activity of anodic biofilm in microbial fuel cells
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Liang, Peng, Wang, Huiyong, Xia, Xue, Huang, Xia, Mo, Yinghui, Cao, Xiaoxin, and Fan, Mingzhi
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CARBON nanotubes , *POWDER metallurgy , *ELECTRODES , *BIOFILMS , *MICROBIAL fuel cells , *COMPOSITE materials , *ELECTRIC power production , *ELECTRIC resistance - Abstract
Abstract: Carbon nanotube (CNT) is a promising electrode material and has been used as an anode modifier in microbial fuel cells (MFCs). In this study, a new method of simultaneously adding CNT powders and Geobacter sulfurreducens into the anode chamber of a MFC was used, aiming to form a composite biofilm on the anode. The performance of MFCs such as startup time and steady-state power generation was investigated under conditions of different CNT powders dosages. Results showed that both the startup time and the anodic resistance were reduced. The optimal dosage of CNT powders pre-treated by acid was 4mg/mL for the anode chamber with an effective volume of 25mL. The anodic resistance and output voltage of the MFC with CNT powders addition were maintained around 180Ω and 650mV during 40 days operation, while those of the MFC without CNT powders addition increased from 250Ω to 540Ω and decreased from 630mV to 540mV, respectively, demonstrating that adding CNT powders helped stabilize the anodic resistance, thus the internal resistance and power generation during long-term operation. Based on cyclic voltammogram, the electrochemical activity of anodic biofilm was enhanced by adding CNT powders, though no significant increase of the biomass in anodic biofilm was detected by phospholipids analysis. There was no remarkable change of ohmic resistance with an addition of CNT powders revealed by current interrupt method, which indicated that the rate of mass transfer might be promoted by the presence of CNT powders. [ABSTRACT FROM AUTHOR]
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- 2011
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20. Simultaneous carbon and nitrogen removal using an oxic/anoxic-biocathode microbial fuel cells coupled system
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Xie, Shan, Liang, Peng, Chen, Yang, Xia, Xue, and Huang, Xia
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MICROBIAL fuel cells , *ELECTROCHEMISTRY , *DENITRIFICATION , *NITRIFICATION , *CATHODES , *CARBON , *NITROGEN removal (Water purification) , *CHEMICAL oxygen demand - Abstract
Abstract: A coupled microbial fuel cell (MFC) system comprising of an oxic-biocathode MFC (O-MFC) and an anoxic-biocathode MFC (A-MFC) was implemented for simultaneous removal of carbon and nitrogen from a synthetic wastewater. The chemical oxygen demand (COD) of the influent was mainly reduced at the anodes of the two MFCs; ammonium was oxidized to nitrate in the O-MFC’s cathode, and nitrate was electrochemically denitrified in the A-MFC’s cathode. The coupled MFC system reached power densities of 14W/m3 net cathodic compartment (NCC) and 7.2W/m3 NCC for the O-MFC and the A-MFC, respectively. In addition, the MFC system obtained a maximum COD, NH4 +-N and TN removal rate of 98.8%, 97.4% and 97.3%, respectively, at an A-MFC external resistance of 5 Ω, a recirculation ratio (recirculated flow to total influent flow) of 2:1, and an influent flow ratio (O-MFC anode flow to A-MFC anode flow) of 1:1. [ABSTRACT FROM AUTHOR]
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- 2011
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21. Enhancing extracellular electron transfer efficiency and bioelectricity production by vapor polymerization Poly (3,4-ethylenedioxythiophene)/MnO2 hybrid anode.
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Liu, Panpan, Zhang, Changyong, Liang, Peng, Jiang, Yong, Zhang, Xiaoyuan, and Huang, Xia
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MANGANESE dioxide , *CHARGE exchange , *POLYMERIZATION , *MICROFABRICATION , *ELECTROPHYSIOLOGY - Abstract
Abstract Electron transfer efficiency in electroactive biofilm is the limiting factor for bioelectricity output of bioelectrochemical system. Here, carbon felt (CF) is coated with manganese dioxide (MnO 2) which acts as electron mediator in electroactive biofilm. A wrapping layer of conducting Poly 3,4-ethylenedioxythiophene is developed to protect the MnO 2 and enhance electron transfer efficiency of MnO 2 mediator. The hybrid bioanode (PEDOT/MnO 2 /CF bioanode) delivered the highest electron transfer efficiency (6.3 × 10−9 mol cm−2 s−1/2) and the highest capacitance of 4.78 F, much higher than bare CF bioanode (1.50 ± 0.04 × 10−9 mol cm−2 s−1/2 and 0.42 F). As a result, microbial fuel cells could produce a maximum power density of 1534 ± 13 mW m−2, approximately 57.7% higher than that with the bare carbon felt anode (972 ± 21 mW m−2). Possible mechanisms are proposed to help understanding the different function of the PEDOT and MnO 2 on the anodic layer. This study introduces an effective method for the fabrication of high performance anode. Graphical abstract Unlabelled Image Highlights • A MnO 2 layer acts as electron mediator in electrochemical biofilm. • The wrapping layer of PEDOT helps to enhance electron transfer efficiency. • Electron transfer efficiency improved by ~4 times. • PEDOT/MnO 2 /CF anode increases the maximum power density by 143%. [ABSTRACT FROM AUTHOR]
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- 2019
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22. Combined photoelectrocatalytic microbial fuel cell (PEC-MFC) degradation of refractory organic pollutants and in-situ electricity utilization.
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Zhang, Manman, Wang, Ying, Liang, Peng, Zhao, Xu, Liang, Mingxing, and Zhou, Bin
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MICROBIAL fuel cells , *CHEMICAL oxygen demand , *ELECTRICITY , *ANILINE , *POLLUTANTS - Abstract
Abstract A new photoelectrocatalytic (PEC) and microbial fuel cell (MFC) process was developed and applied to simultaneously remove refractory organic pollutants (i.e., phenol and aniline) from wastewater while recovering energy for in-situ utilization. The current generated by the MFC process was applied to drive the PEC reaction. Compared with single PEC or MFC processes, the PEC-MFC combined process showed higher pollutant and chemical oxygen demand (COD) removal capacities and electricity production. Over 95% of the phenol or aniline was removed by these process, even at high initial concentrations. The COD removal efficiencies for phenol and aniline were ca. 96% (from 700 to 29 mg L−1) and 70% (from 165 to 49 mg L−1), respectively. Although the PEC process showed a limited contribution to phenol and aniline removals (16.5% and 43%, respectively), the utilization of PEC-treated phenol or aniline streams resulted in a MFC with higher voltage output, higher coulombic efficiency, maximal volumetric power density, and lower internal resistance as compared to untreated water. High-performance liquid chromatography coupled with mass spectrometry measurements revealed quinones/hydroquinones and low molecular weight organic acids to be produced as intermediates after the PEC process, which could improve the production of electricity in the MFC. Highlights • A new process composed of photoelectrocatalysis (PEC) and microbial fuel cell (MFC) was developed. • PEC-MFC may simultaneously remove pollutants and recover energy for in-situ utilization. • The (hydro)Quinones and low-molecular-weight organic acid as products from PEC increase electricity production of MFC. • A consecutive, dynamic adsorption and degradation process in MFC supply stable current to drive PEC. [ABSTRACT FROM AUTHOR]
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- 2019
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23. Microbial fuel cell sensors for water quality early warning systems: Fundamentals, signal resolution, optimization and future challenges.
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Jiang, Yong, Yang, Xufei, Liang, Peng, Liu, Panpan, and Huang, Xia
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MICROBIAL fuel cells , *WATER quality , *FUEL cells , *TOXICITY testing , *RENEWABLE energy sources , *MATHEMATICAL models - Abstract
An early warning system is important to guarantee human health and ecological safety. Microbial fuel cell (MFC) sensor can achieve a self-sustainable monitoring without additional transducer or power sources. It would not limited by the main bottleneck of other contemporary MFC technologies, i.e., the low current density output, and is believed one of the most promising applications in the niche market of MFC technologies. This review is limited to MFC sensors for water quality early warning systems only, with emphasis on biochemical oxygen demand (BOD) and toxicity sensors. A comprehensive summary and discussion on sensor fabrication, operation, data representation, and optimization are provided. The MFC sensor is particularly promising to serve as a self-powered sensing device for in-situ and on-line environmental monitoring, as proved both in laboratory and field test. In addition, the main hurdles and future perspectives are discussed, as well as potential future research, which includes the following: separately lowering the detection limit or improving the concentration range dependent on the application of MFC for organic matter monitoring; further improving the sensitivity as well as lowering the recovery time of biofilm after a certain shock; developing the kinetic and/or empirical model in combining with the detection algorithm to distinguish the signal interference of complex aquatic environment, especially when the shock of BOD and toxicity occur simultaneously. [ABSTRACT FROM AUTHOR]
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- 2018
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24. Optimization of membrane stack configuration in enlarged microbial desalination cells for efficient water desalination.
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Chen, Xi, Sun, Haotian, Liang, Peng, Zhang, Xiaoyuan, and Huang, Xia
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MICROBIAL fuel cells , *SALINE water conversion , *ENERGY consumption , *WASTEWATER treatment , *CHARGE transfer - Abstract
Microbial desalination cells are considered a low-energy-consumption, clean technology to simultaneously purify wastewater and desalinate saline water by utilizing the in situ energy source contained in wastewater. To enhance desalination performance and achieve an optimal membrane stack configuration, an enlarged stacked microbial desalination cell (SMDC) has been developed and tested with 6–14 desalination cells. The cross-membrane area of the enlarged SMDC is 100 cm 2 . The anode and cathode volumes are both 200 mL. To reduce internal resistance, the width of desalination cells is kept as <0.5 mm. The optimal configuration with 10 desalination cells achieves the highest total desalination rate (TDR) of 423 mg/h and the highest charge transfer efficiency (CTE) of 836% when treating the 20 g/L NaCl solution. During this process, the junction potential across membranes increases from 0 to 374 mV, and occupies up to 74% of the total potential loss inside the SMDC. This shows that the SMDC used in this work achieves the highest TDR and CTE among the reported studies, and the junction potential should be effectively controlled to achieve the desired desalination performance in future practical applications. [ABSTRACT FROM AUTHOR]
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- 2016
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25. Carbon filtration cathode in microbial fuel cell to enhance wastewater treatment.
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Zuo, Kuichang, Liang, Shuai, Liang, Peng, Zhou, Xuechen, Sun, Dongya, Zhang, Xiaoyuan, and Huang, Xia
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MICROBIAL fuel cells , *CARBON electrodes , *FUEL cell electrodes , *WASTEWATER treatment , *OXYGEN reduction - Abstract
A homogeneous carbon membrane with multi-functions of microfiltration, electron conduction, and oxygen reduction catalysis was fabricated without using noble metals. The produced carbon membrane has a pore size of 553 nm, a resistance of 6.0 ± 0.4 Ω cm 2 /cm, and a specific surface area of 32.2 m 2 /g. After it was assembled in microbial fuel cell (MFC) as filtration air cathode, a power density of 581.5 mW/m 2 and a current density of 1671.4 mA/m 2 were achieved, comparable with previous Pt air cathode MFCs. The filtration MFC was continuously operated for 20 days and excellent wastewater treatment performance was also achieved with removal efficiencies of TOC (93.6%), NH 4 + –N (97.2%), and total nitrogen (91.6%). In addition, the carbon membrane was much cheaper than traditional microfiltration membrane, suggesting a promising multi-functional material in wastewater treatment field. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
26. Power generation by packed-bed air-cathode microbial fuel cells.
- Author
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Zhang, Xiaoyuan, Shi, Juan, Liang, Peng, Wei, Jincheng, Huang, Xia, Zhang, Chuanyi, and Logan, Bruce E.
- Subjects
- *
MICROBIAL fuel cells , *ELECTRIC power production , *CATHODES , *PACKED bed reactors , *ACTIVATED carbon , *OXYGEN atom transfer reactions , *BINDING agents , *POWER density - Abstract
Highlights: [•] Novel and inexpensive packed-bed air-cathodes were developed for MFCs. [•] The cathode was a loose bed of activated carbon granules without a binder. [•] Power density was positively related to cathode material specific surface area. [•] Granular activated carbon and semi-coke air-cathodes were most cost-effective. [•] Oxygen transfer limited performance with thicker air-cathodes. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
27. Long-term effect of set potential on biocathodes in microbial fuel cells: Electrochemical and phylogenetic characterization
- Author
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Xia, Xue, Sun, Yanmei, Liang, Peng, and Huang, Xia
- Subjects
- *
MICROBIAL fuel cells , *BIOMATERIALS , *PERFORMANCE of cathodes , *ELECTROCHEMISTRY , *PHYLOGENY , *OXYGEN , *BIOMASS - Abstract
Abstract: The long-term effect of set potential on oxygen reducing biocathodes was investigated in terms of electrochemical and biological characteristics. Three biocathodes were poised at 200, 60 and −100mV vs. saturated calomel electrode (SCE) for 110days, including the first 17days for startup. Electrochemical analyses showed that 60mV was the optimum potential during long-term operation. The performance of all the biocathodes kept increasing after startup, suggesting a period longer than startup time needed to make potential regulation more effective. The inherent characteristics without oxygen transfer limitation were studied. Different from short-term regulation, the amounts of biomass were similar while the specific electrochemical activity was significantly influenced by potential. Moreover, potential showed a strong selection for cathode bacteria. Clones 98% similar with an uncultured Bacteroidetes bacterium clone CG84 accounted for 75% to 80% of the sequences on the biocathodes that showed higher electrochemical activity (60 and −100mV). [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
28. Capacitive deionization coupled with microbial fuel cells to desalinate low-concentration salt water.
- Author
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Yuan, Lulu, Yang, Xufei, Liang, Peng, Wang, Lei, Huang, Zheng-Hong, Wei, Jincheng, and Huang, Xia
- Subjects
- *
MICROBIAL fuel cells , *DEIONIZATION of water , *SALINE waters , *DESORPTION , *ENERGY conversion - Abstract
A new technology (CDI-MFC) that combined capacitive deionization (CDI) and microbial fuel cell (MFC) was developed to treat low-concentration salt water with NaCl concentration of 60 mg/L. The water desalination rate was 35.6 mg/(L h), meanwhile the charge efficiency was 21.8%. Two desorption modes were investigated: discharging (DC) mode and short circuit (SC) mode. The desalination rate in the DC mode was 200.6 ± 3.1 mg/(L h), 47.8% higher than that in the SC mode [135.7 ± 15.3 mg/(L h)]. The average current in the DC mode was also much higher than that of the SC mode. The energy stored in the CDI cell has been reused to enhance the electron production of MFC by the discharging desorption mode (DC mode), which offers an approach to recover the electrostatic energy in the CDI cell. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
29. Electricity generation and microbial community changes in microbial fuel cells packed with different anodic materials
- Author
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Sun, Yanmei, Wei, Jincheng, Liang, Peng, and Huang, Xia
- Subjects
- *
MICROBIAL fuel cells , *ELECTRIC power production , *ANODES , *CARBON , *GRAPHITE , *MICROORGANISM populations , *BIOTIC communities , *BIOMASS - Abstract
Abstract: Four materials, carbon felt cube (CFC), granular graphite (GG), granular activated carbon (GAC) and granular semicoke (GS) were tested as packed anodic materials to seek a potentially practical material for microbial fuel cells (MFCs). The microbial community and its correlation with the electricity generation performance of MFCs were explored. The maximum power density was found in GAC, followed by CFC, GG and GS. In GAC and CFC packed MFCs, Geobacter was the dominating genus, while Azospira was the most populous group in GG. Results further indicated that GAC was the most favorable for Geobacter adherence and growth, and the maximum power densities had positive correlation with the total biomass and the relative abundance of Geobacter, but without apparent correlation with the microbial diversity. Due to the low content of Geobacter in GS, power generated in this system may be attributed to other microorganisms such as Synergistes, Bacteroidetes and Castellaniella. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
30. Scalable air cathode microbial fuel cells using glass fiber separators, plastic mesh supporters, and graphite fiber brush anodes
- Author
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Zhang, Xiaoyuan, Cheng, Shaoan, Liang, Peng, Huang, Xia, and Logan, Bruce E.
- Subjects
- *
MICROBIAL fuel cells , *CATHODES , *GLASS fibers , *MACHINE separators , *GRAPHITE fibers , *ANODES , *ELECTROPHYSIOLOGY , *ELECTROCHEMISTRY , *BIOMASS energy , *ELECTRODES - Abstract
Abstract: The combined use of brush anodes and glass fiber (GF1) separators, and plastic mesh supporters were used here for the first time to create a scalable microbial fuel cell architecture. Separators prevented short circuiting of closely-spaced electrodes, and cathode supporters were used to avoid water gaps between the separator and cathode that can reduce power production. The maximum power density with a separator and supporter and a single cathode was 75±1W/m3. Removing the separator decreased power by 8%. Adding a second cathode increased power to 154±1W/m3. Current was increased by connecting two MFCs connected in parallel. These results show that brush anodes, combined with a glass fiber separator and a plastic mesh supporter, produce a useful MFC architecture that is inherently scalable due to good insulation between the electrodes and a compact architecture. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
31. Remediation of simulated malodorous surface water by columnar air-cathode microbial fuel cells.
- Author
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Wang, Hairong, Fu, Boya, Xi, Jinying, Hu, Hong-Ying, Liang, Peng, Huang, Xia, and Zhang, Xiaoyuan
- Abstract
Malodorous surface water is an important worldwide environmental concern. Current remediation methods, such as aeration or the addition of chemicals, are not eco-friendly due to their high energy consumption or secondary pollution. This study proposed a modified columnar air-cathode microbial fuel cell as a sustainable and effective remediation module to improve water quality. The excellent and economic sheet air-cathode (activated carbon and carbon black as the catalyst layer) and a carbon brush anode were applied in the columnar air-cathode microbial fuel cell (MFC). The results after 48 h showed that by providing the anode as an electron acceptor and enriching electrochemically-active bacteria, MFCs with different external resistances (5 k Ω, 30 Ω, and 2 Ω) exhibited the much better capacity to improve water quality than the Blank group. The maximum COD and sulfide removal rates in the MFCs were approximately 86.3% and 100%, respectively, which were higher than those of the Blank group by 30% and 35%, respectively. The MFCs also showed maximum sulfate increments from 28 mg L−1 to 98 mg L−1 compared with the sulfate reduction to 10 mg L−1 in the Blank group. The oxidation reduction potential (ORP) of the MFCs dramatically increased from −281.2 mV to −135.7 mV after 24 h, whereas the ORP of the Blank group decreased to −287.7 mV. The enrichment of the aerobic bacteria Acinetobacter on the anodes and chemolithoautotrophic sulfide oxidation bacteria Sulfuricurvum, Thiovirga and Thiobacillus in the MFCs could also contribute to COD and sulfide removal. Cathode reduction, which could produce small amounts of hydroxyl radicals, might assist with the ORP elevation and the complete oxidation of dissolved sulfide to sulfate. Unlabelled Image • A modified columnar air-cathode MFC is designed for remediation of overlying water in malodorous surface water. • MFC significantly improves COD and sulfide removal rates with sulfate accumulation. • MFC elevates ORP in simulated overlying water dramatically. • MFC enhances the enrichment of chemolithoautotrophic sulfide oxidation bacteria. • Hydroxyl radicals detected in MFC is one possible contributor for remediation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
32. Optimization and simulation of a carbon-based flow-through composite anode configuration to enhance power generation and improve effluent quality simultaneously for microbial fuel cells.
- Author
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Fu, Boya, Xu, Ting, Guo, Xingguo, Liang, Peng, Huang, Xia, and Zhang, Xiaoyuan
- Subjects
- *
MICROBIAL fuel cells , *EFFLUENT quality , *PERFORMANCE of microbial fuel cells , *ANODES , *CHEMICAL oxygen demand , *COMPUTATIONAL fluid dynamics - Abstract
As a viable wastewater treatment and energy recovery technology, microbial fuel cell (MFC) requires more research with regard to the simultaneous achievement of high-quality effluent and high power generation. In this study, a novel flow-through carbon-based composite anode configuration is proposed, which combines the carbon cloth of two-dimensional anode with wooden granular activated carbon of three-dimensional anode. The proposed configuration enhances the performance of power production and chemical oxygen demand degradation by promoting the mass transfer, reducing internal resistance and increasing bioburden. Microbial fuel cell with the composite anode exhibited the highest maximum power density (1300 ± 50 mW m−2) and the highest chemical oxygen demand removal rate constant (0.155 ± 0.007 h−1) compared with the microbial fuel cell using the carbon cloth anode (1136 ± 46 mW m−2 and 0.072 ± 0.008 h−1) or the wooden granular activated carbon anode (1045 ± 32 mW m−2 and 0.129 ± 0.009 h−1). Meanwhile, at a lower chemical oxygen demand concentration (about 48 mg L−1), the microbial fuel cell with the composite anode maintained a current density of 2.4 A m−2, which is 18% higher than the wooden granular activated carbon anode (2.04 A m−2) and 400% higher than the carbon cloth anode (0.48 A m−2). The cyclic voltammetry and electrochemical impedance spectroscopy tests confirmed that the composite anodes displayed better electrochemical performance. Improving the flow rate and reducing the external resistance could effectively enhance the power production and chemical oxygen demand removal performance of microbial fuel cells, while the computational fluid dynamics simulation intuitively demonstrated the positive effect of the composite anode on chemical oxygen demand degradation. These results suggest that the flow-through composite anode provides a feasible strategy to simultaneously enhance the power generation and improve the effluent quality. Image 1 • A composite anode was constructed by optimizing 2D and 3D carbon anode materials.. • Flow-through composite anode MFC had higher power generation and COD removal rate. • Flow-through composite anode MFC maintained high power generation at low COD. • Reducing external resistance and improving flow rate enhanced the MFC performance. • Flow-through composite anode MFC was proved better COD removal in CFD simulation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
33. Zinc: A promising material for electrocatalyst-assisted microbial electrosynthesis of carboxylic acids from carbon dioxide.
- Author
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Jiang, Yong, Chu, Na, Zhang, Wei, Ma, Junjun, Zhang, Fang, Liang, Peng, and Zeng, Raymond Jianxiong
- Subjects
- *
ELECTROSYNTHESIS , *CARBOXYLIC acids , *CARBON dioxide , *ELECTROLYTIC reduction , *CHEMICAL energy , *ZINC - Abstract
Microbial electrosynthesis (MES) has been proposed as a sustainable platform to simultaneously achieve wastewater treatment, renewable energy generation and chemicals production. Currently, the CO 2 valorization via MES is restricted by the low production rate, while that via electrochemical reduction is limited by the production of C1 products with high efficiency and selectivity. The electrocatalyst-assisted MES could potentially solve these bottlenecks of both MES and electrochemical reduction technology by increasing the production rate and expanding the product range. Here, four types of metals were evaluated for mixed culture-based, electrocatalyst-assisted MES with the fabrication of electrical-biological hybrid cathodes. Cathodes based on In, Zn, Ti and Cu showed high parallelism at 30 A/m2. However, no parallelism was observed at 50 A/m2, and only Zn experienced a further increase of the maximum acetic acid production rate (1.23 ± 0.02 g/L/d, 313 ± 5 g/m2/d) and titer (9.2 ± 0.1 g/L), with the highest value of the production rate normalized to the project area of the fiber cathodes. Other volatile fatty acids and ethanol were below 0.5 g/L. Moreover, it was the sharp H 2 generation, which mainly caused the fluctuation of coulombic efficiency. The application of such Zn-based electrical-biological hybrid system shall provide a more efficient route for CO 2 valorization. Image 1 • Electrocatalysts (In, Zn, Ti, Cu) were evaluated for electrocatalyst-assisted MES. • Zn based electrical-biological hybrid cathode can be steadily operated at 50 A/m2. • It has the highest record of fiber cathodes (1.23 ± 0.02 g/L/d, 313 ± 5 g/m2/d). • Sharp H 2 generation mainly caused the catholyte alkalization and CE fluctuation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
34. Facile synthesis of cobalt oxide as electrocatalyst for the oxygen reduction reaction in microbial fuel cells.
- Author
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Xia, Xue, Li, Mengchen, Liu, Tao, Liang, Peng, and Huang, Xia
- Subjects
- *
COBALT oxides , *OXYGEN reduction , *FUEL cells , *MICROBIAL fuel cells , *CATALYSTS - Abstract
Cost-effective cobalt oxides were synthesized at mild condition as alternatives to platinum catalyst for oxygen reduction in microbial fuel cells (MFCs). The catalysts were prepared by heating Co(NO 3 ) 2 above its decomposition temperature together with carbon black (CB). At a catalyst loading of 5 mg/cm 2 , cobalt oxide cathodes with a Co(NO 3 ) 2 to CB ratio of 0.732:1 produced a maximum power density of 1220 mW/m 2 , which was slightly lower than that of Pt/C cathodes (1360 mW/m 2 ). Further increase in the loading of cobalt oxides resulted in an increase in performance. The maximum power densities produced by cobalt oxide cathodes increased to 1400 mW/m 2 at a catalyst loading of 20 mg/cm 2 and 1540 mW/m 2 at 30 mg/cm 2 , which outperformed the Pt/C control. The durability of cobalt oxide catalysts was comparable to that of Pt/C in single-chamber MFCs with biological contamination. The costs of cobalt oxide catalysts were much lower than that of Pt/C catalyst, even when the loading of cobalt oxides was several times higher than Pt/C catalyst. These findings show that the facilely synthesized cobalt oxides were cost-effective catalysts for oxygen reduction in air-cathode MFCs. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
35. A novel filtration composite anode configuration of microbial fuel cell for efficient wastewater treatment and enhanced power generation.
- Author
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Xu, Ting, Wang, Qiuying, Wu, Shijia, Fu, Boya, Liang, Peng, Huang, Xia, and Zhang, Xiaoyuan
- Subjects
- *
MICROBIAL fuel cells , *MICROBIAL biotechnology , *WASTEWATER treatment , *ORGANIC wastes , *INDUSTRIAL wastes - Abstract
A microbial fuel cell (MFC), as a cleaner wastewater treatment process, can recover electricity from organic wastes. However, high power production and high quality effluent are difficult to achieve simultaneously. In this study, a novel filtration composite anode (FCA), which combined carbon fiber brush and carbon textile was proposed to enhance COD removal and power generation performance of MFCs. The COD removal rate constant of MFCs with the filtration composite anode (FCA-MFC) was 0.33 h −1 , much higher than that of MFCs with single brush anode (FB-MFC) (0.23 h −1 ) or textile anode (FT-MFC) (0.18 h −1 ) in the recirculation mode, and also exceeded that of CA-MFC in non-recirculation mode (0.12 h −1 ). FCA-MFC delivered a maximum power density of 1140 mW m −2 at a recirculation rate of 2 mL min −1 , which was higher than the FB-MFC (990 mW m −2 ) and the FT-MFC (80 mW m −2 ) and its counterparts in non-recirculation mode (1000 mW m −2 ). Moreover, the FCA-MFC maintained a higher current density (4.0 A m −2 ) than the other two MFCs until the COD decreased to 40 mg L −1 at an external resistance of 100 Ω. CV and EIS tests verified a higher electrochemical performance of the filtration composite anode. These results demonstrated higher COD removals and power generation of the composite anode at ambient temperature, resulting from the filtration effect that facilitated mass transfer, increased microbial colonization, and improved electrochemical activity. Considering the high-quality effluent and high power generation, the filtration composite anode configuration promises a great potential for sustainable wastewater treatment application. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
36. Hydrogen peroxide generation in microbial fuel cells using graphene-based air-cathodes.
- Author
-
Dong, Heng, Liu, Xiaowan, Xu, Ting, Wang, Qiuying, Chen, Xianghao, Chen, Shuning, Zhang, Helan, Liang, Peng, Huang, Xia, and Zhang, Xiaoyuan
- Subjects
- *
HYDROGEN peroxide , *GRAPHENE oxide , *MICROBIAL fuel cells , *WASTEWATER treatment , *CATALYTIC activity - Abstract
Utilization of two-electron oxygen reduction reaction (ORR) in bioelectrochemical systems (BES) is a novel way to generate H 2 O 2 from wastewater, and cathode catalyst is a key factor affecting ORR performance. Here, the catalytic performance of plain graphene, oxidized graphene and graphene oxide (GO) in microbial fuel cells (MFCs) and the influence of oxygen-containing functional groups are reported. Oxidized graphene air-cathode had 78% and 131% higher H 2 O 2 productions than plain graphene cathode respectively in an abiotic reactor and an MFC. GO showed nearly no H 2 O 2 production in the tests. XPS revealed that oxygen atomic fraction of oxidized graphene reached 5.7%, mostly in the form of C O C. These results show that oxidized graphene had good catalytic performance for H 2 O 2 production, and oxygen-containing functional groups, especially C O C could significantly enhance its performance, but overoxidation worked adversely. Meanwhile, using oxidized graphene air-cathode could realize simultaneous wastewater treatment, power output and H 2 O 2 generation in MFCs. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
37. Enhanced performance of nitrogen-doped carbon nanotube membrane-based filtration cathode microbial fuel cell.
- Author
-
Zuo, Kuichang, Liu, Han, Zhang, Qiaoying, Liang, Peng, Vecitis, Chad D., and Huang, Xia
- Subjects
- *
DOPING agents (Chemistry) , *CARBON nanotubes , *MICROBIAL fuel cells , *FILTERS & filtration , *ARTIFICIAL membranes - Abstract
In this study, nitrogen-doped carbon nanotube (N-CNT) membrane compared with Pt-coated CNT (Pt-CNT) membrane and pristine CNT membrane were utilized as air cathode as well as filtration material of microbial fuel cells (MFCs). The MFCs were continuously operated for 39 days to investigate their power generation, organics removal, proton transfer, and fouling behavior under various influent concentrations and hydraulic retention times (HRTs). During operation, the N-CNT filtration MFC achieved the best effluent quality and power generation, with efficient removal of total organic carbon (TOC) (95.2%) and NH 4 + -N (97.7%), and maximum power density and current density of 408 mW/m 2 and 2.36 A/m 2 respectively. The excellent performance of the N-CNT MFC was mainly attributed to its special morphology and rich N-functional groups. The N-CNT membrane has a nanotube diameter of 37 ± 4 nm, pore size of 95 ± 33 nm, and porosity of 79.9%, which was even better than traditional microfiltration membrane as a filtration material for pollutant removal. The high nitrogen content (2.12 at%) and high specific surface area (93.5 m 2 /g) due to its network structure also enhanced O 2 reduction. In addition to the excellent performance of N-CNT cathode, the filtration operation enhanced cathode O 2 reduction by increasing mass transfer in cathode micro-pore and improving proton transfer with water flowing from anode to cathode. Moreover, a separate experiment also demonstrated that the cathode fouling could be mitigated under high current operation. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
38. A novel pilot-scale stacked microbial fuel cell for efficient electricity generation and wastewater treatment.
- Author
-
Wu, Shijia, Li, Hui, Zhou, Xuechen, Liang, Peng, Zhang, Xiaoyuan, Jiang, Yong, and Huang, Xia
- Subjects
- *
MICROBIAL fuel cells , *ELECTRIC power production , *WASTEWATER treatment , *ACTIVATED carbon , *PACKED beds (Chemical industry) , *CHEMICAL oxygen demand - Abstract
A novel stacked microbial fuel cell (MFC) which had a total volume of 72 L with granular activated carbon (GAC) packed bed electrodes was constructed and verified to present remarkable power generation and COD removal performance due to its advantageous design of stack and electrode configuration. During the fed-batch operation period, a power density of 50.9 ± 1.7 W/m 3 and a COD removal efficiency of 97% were achieved within 48 h. Because of the differences among MFC modules in the stack, reversal current occurred in parallel circuit connection with high external resistances (>100 Ω). This reversal current consequently reduced the electrochemical performance of some MFC modules and led to a lower power density in parallel circuit connection than that in independent circuit connection. While increasing the influent COD concentrations from 200 to 800 mg/L at hydraulic retention time of 1.25 h in continuous operation mode, the power density of stacked MFC increased from 25.6 ± 2.5 to 42.1 ± 1.2 W/m 3 and the COD removal rates increased from 1.3 to 5.2 kg COD/(m 3 d). This study demonstrated that this novel MFC stack configuration coupling with GAC packed bed electrode could be a feasible strategy to effectively scale up MFC systems. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
39. Enhancing charge harvest from microbial fuel cells by controlling the charging and discharging frequency of capacitors.
- Author
-
Ren, Shiting, Xia, Xue, Yuan, Lulu, Liang, Peng, and Huang, Xia
- Subjects
- *
MICROBIAL fuel cells , *CHARGING effects , *ELECTRIC power production , *CAPACITORS , *SWITCHING circuits , *BIOMASS energy - Abstract
Highlights: [•] Switching time for the MFC-capacitor system affected the electricity generation. [•] Lower switching time brought higher current generation and organic removal of MFC. [•] High charge recovery efficiency depended on selection of proper switching time. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
40. Electricity generation by an enriched phototrophic consortium in a microbial fuel cell
- Author
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Cao, Xiaoxin, Huang, Xia, Boon, Nico, Liang, Peng, and Fan, Mingzhi
- Subjects
- *
FUEL cells , *ELECTRIC power production , *PHOTOSYNTHETIC bacteria , *POWER resources , *CHARGE exchange , *FLUORESCENCE spectroscopy - Abstract
Abstract: Microbial fuel cell (MFC) technology is a novel electricity generation process catalyzed by microorganisms. Much progress is made in the design and construction of MFCs, however the diversity of the electrochemically active microorganisms and the electricity generation mechanisms remain a black box. As sun is a predominantly unused energy resource, here we present a highly enriched phototrophic consortium that can produce electricity in an “H” typed MFC at a high power density (2650mWm−2, normalized to membrane area) in light, which was eightfold of that produced by non-enriched consortium in the same reactor. Light–dark shift experiments showed that light contributed to the electricity generation. A microbial excreted mediator assisted the electron transfer to the electrode. During the experiment, the accumulation of the mediator over time enhanced the electron transfer rate. The excitation–emission matrix fluorescence spectroscopy results indicated indole group containing compound representing the dominant mediator component. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
- View/download PDF
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