Article
Biophysics
Yue Wu, Qing Du, Yuxuan Wan, Qian Zhao, Nan Li, Xin Wang
Summary: This study demonstrates the possibility of reverse bioelectron transfer in Geobacter-dominated electroactive biofilms, achieving a high efficiency of dissimilatory nitrate reduction to ammonia (DNRA). The use of constant current is found to be more effective in maintaining Geobacter on the cathode, and the prevalence of DNRA at constant current is shown through gene transcription analysis. Metatranscriptomics reveals potential electron uptake mechanisms in the biofilms.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Electrochemistry
Xiaojia He, Grayson Chadwick, Fernanda Jimenez Otero, Victoria Orphan, Christof Meile
Summary: Utilizing a spatially resolved numerical model, this study reveals that the distribution of electric potential and pH control cellular metabolism in G. sulfurreducens biofilms, supporting the presence of two activity modes. The model provides insights into fundamental mechanisms of electron transfer at Micron-scale in conductive biofilms, which can inform the design of MFCs to maximize current production.
Review
Biotechnology & Applied Microbiology
Shen Wang, Xinglei Zhuang, Weiliang Dong, Fengxue Xin, Honghua Jia, Xiayuan Wu
Summary: Bioelectrochemical systems (BESs) are emerging as a promising technology for wastewater treatment and resource recovery. These systems enable electron transfer between microorganisms and electrodes, and find applications in electricity production, bioremediation, biosensors, and biocatalysis. However, electrode biofilms face challenges such as long acclimation period, low biomass attachment, high electron transfer resistance, and poor stability, which hinder the development of this technology.
FERMENTATION-BASEL
(2023)
Article
Biochemistry & Molecular Biology
Timothe Philippon, Jianghao Tian, Chrystelle Bureau, Cedric Chaumont, Cedric Midoux, Julien Tournebize, Theodore Bouchez, Frederic Barriere
Summary: Stimulating denitrification through electrochemical methods is an innovative way to limit nitrate contamination. The study showed that biocathodes can enhance denitrification efficiency, with significant presence of the Azoarcus and Pontibacter genera observed through 16S rRNA gene sequencing.
BIOELECTROCHEMISTRY
(2021)
Article
Environmental Sciences
Zhe Zhang, Wei Ma, Jinglu Hu, Gang Xin, Zhen Chen, Chunxiang Wan, Shuang Wang, Qi Zhang
Summary: The novel biochar electrode Bio-Fe3O4/CF prepared for the electroreduction of nitrate significantly increases the reduction rate, with the presence of Cl and Br in the solution promoting the conversion of NH4+ to N-2 for regulation of nitrogen element. The interconversion of Fe (II) and Fe (III) in the mechanism analysis facilitates the transfer of electrons to nitrate, showing potential for efficient nitrate removal.
Review
Chemistry, Physical
Jing Wang, Tao Feng, Jiaxin Chen, Vinoth Ramalingam, Zhongxiao Li, Daniel Manaye Kabtamu, Jr-Hau He, Xiaosheng Fang
Summary: Ammonia (NH3) is considered a potential carbon-free energy carrier and a crucial feedstock for various industries. Electrochemical N2 reduction to NH3 has emerged as an alternative method, utilizing nitrate/nitrite as nitrogen sources to mitigate environmental concerns. Challenges remain in achieving high NH3 yield and efficiency, highlighting the need for further research into metal nanocatalysts and cycles stability.
Article
Engineering, Environmental
Qinan Song, Shuo Zhang, Xiaoshu Hou, Jiacheng Li, Lei Yang, Xiang Liu, Miao Li
Summary: This study proposes a strategy for efficient nitrate removal through the activation of oxygen vacancies on a highly dispersed Cu-doped TiO(2 )nanotube array (Cu/ TNTA) cathode via electrodeposition. The results show that trace Cu doping promotes efficient charge transfer between nitrate and the electrode, leading to enhanced nitrate removal rate and stability.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Ting Zhao, Beizhen Xie, Yue Yi, Yuxuan Zang, Hong Liu
Summary: This study investigated the effects of periodic polarity reversal (PPR) and polarity reversal once only (PRO) on the long-term performances of denitrifying BESs. The results showed that the PPR-BESs had higher nitrate removal efficiency, while the performance of PRO-BESs gradually decreased.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yueyao Wu, Yuwei Gu, Wenda Kang, Hongtao Yu, Shuo Chen, Xie Quan, Na Lu
Summary: Electrochemistry is a potential technology for removing nitrate from high-salinity water. By using alkali-etched microchannel charcoal as a cathode, the adsorption of NO3- on the cathode surface can be improved, leading to enhanced nitrate reduction efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Microbiology
Lukas Denkhaus, Fanny Siffert, Oliver Einsle
Summary: DNRA is a crucial pathway in the nitrogen cycle, allowing for the retention of nitrogen within ecosystems and serving as a nitrogen source for other organisms.
FEMS MICROBIOLOGY LETTERS
(2023)
Article
Environmental Sciences
Hiroki Nishimura, Mariko Kouduka, Akari Fukuda, Toyoho Ishimura, Yuki Amano, Hikari Beppu, Kazuya Miyakawa, Yohey Suzuki
Summary: Using a high-pressure laboratory incubation system, researchers investigated the activity and abundance of Ca. Methanoperedenaceae archaea in deep groundwater samples from a research laboratory in Japan. They found that these archaea played a role in anaerobic methane oxidation at a depth of 214 meters, but not at a depth of 249 meters. These results suggest that Ca. Methanoperedenaceae archaea are responsible for in situ anaerobic methane oxidation in the 214-meter subsurface borehole interval.
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2023)
Article
Engineering, Environmental
Zhuang Chen, Yimei Zhang, Ting Cao, Kaiwen Yao
Summary: In this study, a Co/Ni bimetallic electrode was fabricated and demonstrated to have excellent catalytic activity and high nitrogen selectivity in the electrochemical reduction of nitrate.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Physical
Wenda Kang, Liming Yan, Jiahao Tang, Shuai Wu, Hongtao Yu, Zhangliang Li
Summary: In this study, a facile electrochemical activation method was reported to enhance the nitrate reduction ability of graphite electrodes. The activated electrode exhibited a significantly higher nitrate reduction rate and lower solid-liquid interfacial resistance compared to the pristine graphite electrode. Moreover, the activated graphite electrode maintained its excellent performance in nitrate reduction even when enlarged to 2500.0 cm2, suggesting its promising potential for practical application in nitrate removal from water and wastewater.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Xinrui Liu, Rui Guo, Xia Qin, Cuicui Xu
Summary: A Ni foam/CNTs/Cu composite electrode was prepared and used as a cathode for NO3- -N reduction, showing enhanced total nitrogen removal and N2 selectivity. The electrode had more electrochemical active sites compared to the Ni foam/Cu electrode. By adding Cl- as electrolyte, the N2 selectivity of the Ni foam/CNTs/Cu electrode could be significantly enhanced. The electrode exhibited stable performance and a potential mechanism of nitrate-nitrogen removal by the electrocatalytic process was proposed.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Electrochemistry
Yang Xu, Weifu Sun, Jun Cheng, Xian Yang, Guorun Dai, Jianzhong Liu
Summary: Electroreduction of nitrate to ammonia was successfully achieved using a Co/Cu foam electrode, which showed high stability and selectivity over a wide potential range. Density functional theory calculations revealed that Co nanosheets reduce the energy barrier of the hydrogenation pathway, leading to increased NH3 yield rate.
ELECTROCHIMICA ACTA
(2023)
Article
Biotechnology & Applied Microbiology
Hengjing Yan, Matthew D. Yates, John M. Regan
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2015)
Article
Agricultural Engineering
Liang Zhang, Xun Zhu, Hiroyuki Kashima, Jun Li, Ding-ding Ye, Qiang Liao, John M. Regan
BIORESOURCE TECHNOLOGY
(2015)
Article
Chemistry, Physical
Shiqi Ou, Hiroyuki Kashima, Douglas S. Aaron, John M. Regan, Matthew M. Mench
JOURNAL OF POWER SOURCES
(2016)
Article
Chemistry, Physical
Shiqi Ou, Yi Zhao, Douglas S. Aaron, John M. Regan, Matthew M. Mench
JOURNAL OF POWER SOURCES
(2016)
Article
Biotechnology & Applied Microbiology
Hou Yu, Hiroyuki Kashima, John M. Regan, Abid Hussain, Elsayed Elbeshbishy, Hyung-Sool Lee
ENZYME AND MICROBIAL TECHNOLOGY
(2017)
Article
Chemistry, Physical
Shiqi Ou, Hiroyuki Kashima, Douglas S. Aaron, John M. Regan, Matthew M. Mench
JOURNAL OF POWER SOURCES
(2017)
Article
Chemistry, Multidisciplinary
Liang Zhang, Xun Zhu, Jun Li, Hiroyuki Kashima, Qiang Liao, John M. Regan
Article
Ecology
Sheila M. Saia, Patrick J. Sullivan, John M. Regan, Hunter J. Carrick, Anthony R. Buda, Nicholas A. Locke, M. Todd Walter
FRESHWATER SCIENCE
(2017)
Article
Ecology
Sheila M. Saia, Patrick J. Sullivan, John M. Regan, Hunter J. Carrick, Anthony R. Buda, Nicholas A. Locke, M. Todd Walter
FRESHWATER SCIENCE
(2017)
Article
Environmental Sciences
Enzo Leiva-Aravena, Eduardo Leiva, Vasty Zamorano, Claudia Rojas, John M. Regan, Ignacio T. Vargas
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Electrochemistry
Ruggero Rossi, Derek M. Hall, Xu Wang, John M. Regan, Bruce E. Logan
ELECTROCHIMICA ACTA
(2020)
Article
Biotechnology & Applied Microbiology
Kyoung-Yeol Kim, Ruggero Rossi, John M. Regan, Bruce E. Logan
Summary: Effluents from acetate- and wastewater-fed MFCs contain high numbers of Geobacter spp., but a high percentage of cells are inactive or dead, leading to lower counts of exoelectrogens using enumeration methods.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Claudia Rojas, Ignacio T. Vargas, Mary Ann Bruns, John M. Regan
BIOELECTROCHEMISTRY
(2017)
Article
Engineering, Environmental
Gulsad Uslu, Ali Demirci, John M. Regan
JOURNAL OF WATER PROCESS ENGINEERING
(2016)