BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Meiying Yu,Qiao Yang,Xiaole Yuan,Yunfei Li,Xuepeng Chen,Yujie Feng,Jia Liu
To achieve a membrane cathode with excellent performance, iron-porphyrin (Fe(por)) was doped to boost the catalytic and permeability properties in microbial fuel cell (MFC). The membrane cathode with the optimal 0.05 g of Fe(por) (denoted as Fe(por)-0.05) had the highest current density of 10.3 A m −2 and the lowest charge transfer resistance of 12.6 ± 0.3 Ω. The ring-disk electrode (RDE) results further proved that the oxygen reduction reaction (ORR) occurred on the Fe(por)-0.05 through a direct four-electron transfer pathway. Moreover, the membrane cathode performed better permeability properties under electric filed and the Fe(por)-0.05 + E (E was electric field) obtained the lowest flux attenuation ratio of 14.1 ± 0.2%, which was related to its superior hydrophilicity and strong electrostatic repulsion force. Iron-porphyrin can simultaneously enhance the ORR activity and permeability of membrane cathode, providing a new direction for the practical application in MFCs.
研究领域:
环境科学
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电化学
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生物能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Weiwei Lu,Yuan Zhang,Jinjin Zhang,Peng Xu
Photoelectrochemical (PEC) reduction of CO2 is a potential way to simultaneously address environmental problems and reduce the energy crisis. However, traditional conversion of CO2 in aqueous solution has serious drawbacks, such as low solubility, slow diffusion, and complicated existing form of CO2 in water, as well as the competitive H2 evolution from reduction of H2O, leading to unsatisfactory conversion efficiency and poor product selectivity. To overcome these problems, in this work, gas CO2 has been directly introduced to a flow cell, in which a membrane cathode assembly with Ag nanocube electrocatalysts is used. It is surprising to find that with this PEC reduction strategy, the product selectivity of CO can be substantially enhanced with the suppression of competitive H2 evolution. The control experiments and theoretical calculations suggest that the facile mass transfer of gas CO2 to the (100) plane of Ag nanocubes electrocatalysts and the suitable photocurrent density may account for such advantages.
研究领域:
环境科学
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能源科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Meiying Yu,Yunfei Li,Wulin Yang,Xiaole Yuan,Nan Li,Weihua He,Yujie Feng,Jia Liu
Use of iron phthalocyanine (FePc) filtration membrane cathode in microbial fuel cell (MFC) is a promising method to simultaneously improve electrocatalytic activity and antifouling performance. The filtration membrane cathode with the optimal content of 0.07 g FePc (FePc-7) exhibited the best oxygen reduction reaction (ORR) activity with the highest current density (12.0 A m −2 ) and the lowest charge transfer impedance (4.1 ± 0.4 Ω), which was 99% higher and 69% lower than the control (12.0 A m −2 and 4.1 ± 0.4 Ω). Besides, the FePc-7 had the largest transferred electrons (n = 3.97), indicating that the ORR occurred through a direct 4e − transfer pathway. The foregoing could be attributed to the Fe-N x structure of FePc to form more energetically catalytic active sites, which could greatly increase the onset potential and reduce the adsorption energy of O 2 . The addition of FePc has remarkably increased the COD removal ratio and the FePc-7 showed the minimum effluent COD concentration of 21.7 ± 1.2 mg L −1 , which was decreased by 61% compared to the control. Moreover, the antifouling performance was also a key factor maintaining excellent electrocatalytic activity and the FePc-7 + E (E was electric field) obtained the lowest flux attenuation ratio of 12.9 ± 0.3% with the thinnest fouling thickness of 55–60 μm, which was decreased by 47% than the control + E. The FePc filtration membrane cathode exhibited outstanding antifouling performance due to its superior hydrophilicity and stronger electrostatic repulsion force under electric field. This work provided an easy and facile modification method for the development of high-performance filtration membrane cathode in the MFC.
研究领域:
环境科学
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电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Xiangyu Li,Gang Yu,Yujue Wang
In this study, a flow-through ozone-electrolysis (O 3 -electrolysis) process was developed by combining ozonation with an electrolysis using a porous reactive electrochemical membrane (REM) cathode. Due to the convection-enhanced mass transport and fast radial diffusion inside the small pores of REM cathodes, the rate of cathodic O 3 reduction to ozonide radicals (O 3 •− ) was significantly enhanced, while the further cathodic O 3 •− reduction to oxygen was inhibited during the flow-through O 3 -electrolysis process compared to the conventional mixed-tank O 3 -electrolysis process. Consequently, more hydroxyl radicals (•OH) were formed from O 3 •− decay in water during the flow-through O 3 -electrolysis process than the mixed-tank O 3 -electrolysis process. Corresponding to the higher •OH yields from cathodic O 3 reduction, the flow-through O 3 -electrolysis process substantially enhanced the abatement kinetics and efficiency of para -benzoic acid ( p CBA, a model compound of ozone-resistant micropollutant) in a groundwater than conventional ozonation and the mixed-tank O 3 -electrolysis process. These results suggest that the flow-through O 3 -electrolysis process may provide a competitive treatment technology for micropollutant abatement in water treatment .
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
PubMed
高影响因子
BIOELECTROCHEMISTRY
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2019
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IF 4.474
Shigang Su,Yizhu Zhang,Wenjuan Hu,Xia Zhang,Dianxing Ju,Changchao Jia,Jian Liu
With the continuous development of the chemical industries, synergistic removal of carbon and nitrogen contaminants has drawn much attention. In this work, a novel strategy for the synergistic removal of methyl orange (MO) and nitrate was developed in a single reactor by combining a TiO 2 /g-C 3 N 4 nanosheet/graphene photoanode and denitrifying biofilm cathode. Under xenon light illumination, the photocatalytic MO decolorization rate exceeded 90% (the initial concentration of MO was as high as 100 mg·L −1 ) with a biocathode potential bias of −0.5 V vs Ag/AgCl; additionally, the decolourization rate apparently followed first-order kinetics with a constant of 0.11 ± 0.02 h −1 . The improved MO decolourization rate was mainly because the biocathode effectively enhanced the charge separation of the photogenerated charge at the TiO 2 /g-C 3 N 4 nanosheet/graphene photoanode interface. In the meantime, the effluent nitrate was lower than 1 mg·N·L −1 at a biocathode potential of −0.5 V vs Ag/AgCl. The results indicated that the coupled biocathode-photoanode system could serve the purpose of simultaneously degrading MO and accomplishing nitrate reduction. Considering the sustainability of sunlight and the use of a biocathode, the coupled biocathode-photoanode system is a promising alternative for the simultaneous removal of biorefractory organics and nitrate.
研究领域:
环境工程
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水处理
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光催化
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）