Article
Chemistry, Physical
Fen Zhang, Wenqiang Xu, Liwen Zhang, Luyao Xi, Yaguang Du, Liying Ma, Shaohua Chen, Dongyun Du
Summary: Using riboflavin as a redox mediator can enhance the bioreduction of Cr(VI) by dissimilatory iron-reducing bacteria (DIRB) and improve the removal efficiency. Different metal ions have varying inhibitory effects on Cr(VI) removal. The role of riboflavin in the remediation of Cr(VI)-contaminated water in natural aquatic environments was investigated through experiments and mechanistic studies.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Environmental Sciences
Peng Zhang, Bingqian Zhu, Shunling Li, Wei Du, Hongbo Peng, Bo Liu, Zhao Wang
Summary: This study investigated the kinetics and efficiency of biochar in promoting Cr(VI) reduction by S. oneidensis MR-1 in a neutral solution. The results showed that the fast-bioreduction rates were influenced by the conductivity and particle size of biochar, while the slow-bioreduction rates were mainly determined by the electron donating capability of biochar, independent of cell concentration. Manipulating biochar properties may be helpful in effectively removing or detoxifying Cr(VI) in the environment.
Article
Public, Environmental & Occupational Health
Thomas J. Weiss, Javier J. Barranco-Trabi, Aaron Brown, Tiffany T. Oommen, Victoria Mank, Cameron Ryan
Summary: Shewanella algae is a widely distributed bacterium in aquatic ecosystems that primarily infects humans through exposure to seawater and consumption of raw seafood, with immunocompromised individuals being the most vulnerable. This case study is unique as it describes a case of Shewanella bacteremia without the typical preceding exposures.
AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
(2022)
Article
Engineering, Environmental
Xiaojing Lu, Yangyang Zhang, Wencai Cheng, Yingzhangyang Liu, Xuanchun Wu, Xiaoan Li, Faqin Dong, Jun Li, Xiaoqin Nie
Summary: The study investigates the role of phytic acid on U(VI) biomineralization and reveals its inhibition effect on U(VI) removal by Shewanella putre-faciens. Phytic acid tends to chelate with U(VI) to form colloid polymer. Calcium and magnesium ions can bind with phytic acid, relieving its inhibition effect. The bacteria mainly interact with U(VI) through phosphorous functional groups.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Limin Zhang, Hailiang Dong, Runjie Li, Dong Liu, Liang Bian, Yu Chen, Zezhen Pan, Maxim I. Boyanov, Kenneth M. Kemner, Jianguo Wen, Qingyin Xia, Hongyu Chen, Edward J. O'Loughlin, Guanyu Wang, Ying Huang
Summary: Previous studies focused on bioreduction of uranium (VI) as a remediation method, but uranium (IV) can be reoxidized and remobilized. In this study, a combination of adsorption and bioreduction of U (VI) in the presence of an organic ligand and a Fe-rich clay mineral was found to partially solve this problem. The results provide novel insights into the mechanisms of U(VI) bioreduction and the stability of U.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Siyu Zhang, Changhao Li, Changdong Ke, Sijia Liu, Qian Yao, Weilin Huang, Zhi Dang, Chuling Guo
Summary: Photosensitized biohybrid system (PBS) allows bacteria to utilize light energy harvested by semiconductors for efficient pollutants transformation, showing great potential in water reclamation. Establishing a biocompatible environment during photocatalytic reactions is crucial for the development of PBS-based treatment technologies. Supplying extracellular polymeric substances (EPS) fractions is found to enhance bacterial viability under adverse conditions, improving the performance of PBS for environmental remediation.
Article
Chemistry, Analytical
Feng-Yu Huang, Hai-Ling Zhang, Su Feng, Huan-Huan Ding, Meng-Xi Cheng, Wei-Dong Liu, Fa-Cheng Yi, Zhe Wang, Yong-Peng Wang, He-Xiang Huang
Summary: The desorption of U(VI) from minerals by microorganisms and their extracellular polymeric substances (EPS) was significantly influenced by the presence of EPS, which competed with bacterial cells for adsorption sites and facilitated the formation of stable complexes. The desorption process of U(VI) on minerals was found to be a complex heterogeneous diffusion and chemical desorption process.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Environmental Sciences
Bo Zhang, Wentao Jiao
Summary: Biochar can facilitate the microbial reduction of various pollutants in soil and groundwater. This study investigated the impact of biochars on Cr(VI) reduction by dissimilatory metal reducing bacteria (DMRB). The results showed that biochars abiotically reduced Cr(VI), which decreased its toxicity to the bacteria, but did not enhance the reduction when added simultaneously with the bacteria. The reaction rates between bioreduced biochars and Cr(VI) were relatively sluggish compared to direct Cr(VI) reduction by the bacteria.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Pei Zhang, Wen-Ping Liu, Tian-Lei Zhao, Qi-Zhi Yao, Han Li, Sheng-Quan Fu, Gen-Tao Zhou
Summary: When inducing bacterial-assisted mineralization of struvite by Shewanella oneidensis MR-1 in simulated Cr(VI)-bearing wastewaters, the yield and conversion efficiency were not significantly affected by Cr(VI), but surface pitting and roughening were observed. The struvite precipitated from the model wastewaters with 0.1 or 0.2 mM Cr(VI) met the regulatory standard of Cr content in fertilizers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Ling Xiong, Liying Ma, Meiqi Zhao, Haojian Zhang, Shaohua Chen
Summary: Nanoscale zero-valent iron (nZVI) was successfully stabilized using fulvic acid (nZVI-FA). Shewanella oneidensis MR-1 (MR-1) was used to enhance the reactivity of the nZVI-FA. The combination of nZVI-FA and MR-1 effectively solved the aggregation and surface passivation of nZVI, significantly enhancing its reactivity for Cr(VI) removal.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Hang Cheng, Zehua Jing, Liu Yang, Anhuai Lu, Guiping Ren, Juan Liu
Summary: This study found that under dark conditions, hematite can promote Cr(VI) removal at low mineral-to-cell ratios, but can hinder the reduction of Cr(VI) with increased mineral ratios. Under simulated sunlight, S. oneidensis MR-1 generates electrons from lactate metabolism to reduce Cr(VI) with hematite.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Boyu Jia, Tianbao Liu, Juanjuan Wan, Andrei Ivanets, Yujia Xiang, Lijuan Zhang, Xintai Su
Summary: Microbial reduction of hexavalent chromium (Cr (VI)) is efficient and cost-effective, but immobilization of Cr (III) remains a challenge due to limited electron donors. A greener and cleaner option is using bioelectrochemical systems, such as the polydopamine (PDA) decorated Shewanella oneidensis MR-1 (S. oneidensis MR-1) bioelectrode. The PDA@S. oneidensis MR-1 biofilm showed increased removal efficiency (RE) of Cr (VI) and immobilization efficiency (IE) of Cr (III) due to shortened distance between individual bacteria.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Yunfei Zhang, Qiang Zhao, Baoliang Chen
Summary: The study used Shewanella oneidensis MR-1 to biosynthesize palladium nanoparticles under aerobic conditions for the reduction of Cr(VI), showing that the size and distribution of the nanoparticles can be controlled by adjusting the ratio of microbial biomass and palladium precursors. The bio-Pd exhibited efficient reduction and catalytic performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Abdelkader Mohamed, Boya Sun, Cheng Yu, Xuemeng Gu, Noha Ashry, Yassine Riahi, Ke Dai, Qiaoyun Huang
Summary: The size of hematite particles and their interaction with microorganisms impact the rate of chromate reduction, with 80 nm hematite particles significantly enhancing the reduction of Cr(VI) by S. oneidensis.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Kemeng Li, Asfandyar Shahab, Jieyue Li, Hongwei Huang, Xiaojie Sun, Shaohong You, Huijun He, He Xiao
Summary: Compost-derived humic acids (HA) and fulvic acids (FA) contain active functional groups and can act as electron shuttles to promote the reduction of heavy metals, thereby changing the form of pollutants in the environment and reducing their toxicity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Jing Li, Jiawei Dong, Yanshan Huang, Jiana Su, Yu Xie, Yundang Wu, Wei Tang, Yongtao Li, Weilin Huang, Chengyu Chen
Summary: This study investigated the aggregation kinetics of three types of titanium dioxide nanoparticles (TiO2 NPs) in human sweat and artificial sweat. Factors such as particle concentration, sweat type, and inorganic and organic constituents were examined. The results showed that most TiO2 NPs remained stable in human sweat samples and their aggregation rates were negatively correlated with zeta potentials. The TiO2 NPs aggregated more rapidly in artificial sweat and were stabilized by organic constituents through steric hindrance. Higher concentrations of particles and certain constituents destabilized the TiO2 NPs, while urea inhibited their aggregation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yundang Wu, Xiao Zhu, Xinxin Wang, Zhixin Lin, John R. Reinfelder, Fangbai Li, Tongxu Liu
Summary: A new electron shuttling pathway was discovered in Shewanella oneidensis MR-1 using the lipophilic electron mediator resazurin. This pathway is independent of the Mtr pathway and relies on the involvement of FccA, CctA, and CymA. The findings provide new insights into the role of exogenous electron mediators in electron shuttling in natural and engineered biogeochemical systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Yufan Zhang, Xiangqin Wang, Yang Yang, Yingmei Huang, Xiaomin Li, Shiwen Hu, Kexue Liu, Yan Pang, Tongxu Liu, Fangbai Li
Summary: In order to assess the risks and develop remediation strategies for mercury-contaminated soils in paddy fields, understanding the mechanisms of mercury transformation and migration is crucial. This study investigated the changes in mercury fractions in a spiked acidic paddy soil under anoxic and oxic conditions, and established a kinetic model to quantitatively estimate the transformation processes. The results provided new insights into the exogenous mercury transformation processes and could be useful in predicting mercury availability in periodically flooded acidic paddy fields.
ENVIRONMENTAL POLLUTION
(2023)
Article
Agriculture, Multidisciplinary
Xiangqin Wang, Yanhong Du, Jing Zhou, Guanhong Chen, Xiaomin Li, Liping Fang, Fangbai Li, Yuzhen Yuan, Yang Yang, Fei Dou
Summary: The bioavailability of arsenic in paddy soil-rice systems is affected by ammonium fertilization, but the mechanisms controlling As transformation are not fully understood. This study found that urea and ammonium bicarbonate fertilizers significantly increased As(III) concentration in porewater, bioavailable As in rhizosphere soil, and the relative abundance of arrA and arsM genes. Moreover, the expression of As transporter genes in rice roots was upregulated, leading to increased translocation efficiency of As(III) from roots to brown rice. Therefore, attention should be paid to As-contaminated paddy fields with ammonium fertilization.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Engineering, Environmental
Kaiyi Huang, Yang Yang, Hansha Lu, Shiwen Hu, Guojun Chen, Yanhong Du, Tongxu Liu, Xiaomin Li, Fangbai Li
Summary: This study investigates the transformation processes of nickel in paddy soils under anoxic and oxic conditions. The results show that under anoxic conditions, complexation with soil organic matter dominates nickel immobilization, while under oxic conditions, organic matter and Fe-Mn oxides contribute similarly to nickel release.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Mi Feng, Yanhong Du, Xiaomin Li, Fangbai Li, Jiangtao Qiao, Gongning Chen, Yingmei Huang
Summary: This study investigated the universality and characteristics of nitrate reduction coupled with arsenic (As) oxidation in paddy soils. The results showed that nitrate effectively transformed toxic As(III) into less toxic and nonlabile As(V), and the addition of nitrate increased the abundance of 16S rRNA and As(III) oxidase genes in the soils. Metagenomic analysis also identified several putative novel nitrate-dependent As(III)-oxidizing bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Songxiong Zhong, Xiaomin Li, Fangbai Li, Dandan Pan, Tongxu Liu, Yingmei Huang, Qi Wang, Haoming Yin, Fang Huang
Summary: The filling of rice grains is a critical period for the accumulation of excessive cadmium (Cd), but uncertainties still exist in identifying the sources of Cd enrichment in grains. In this study, pot experiments were conducted to investigate the transport and redistribution of Cd to grains during drainage and flooding. The results showed that Cd isotopes in rice plants were lighter than those in soil solutions but heavier than those in Fe plaques. Fe plaque was identified as a potential source of Cd in rice, particularly during flooding at the grain filling stage. Drainage during grain filling led to a negative fractionation of Cd from various parts of the rice plant, while flooding facilitated the transport of Cd from leaves, rachises, and husks to grains. These findings highlight the importance of ligands and transporters genes, along with isotope fractionation, in tracking the source of Cd transported to rice grains.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Guoyong Huang, Xiaonan Wang, Dandan Pan, Guang Yang, Ruilin Zhong, Rumiao Niu, Bingqing Xia, Kuan Cheng, Tongxu Liu, Xiaomin Li
Summary: This study investigated the immobilization of cadmium (Cd) during nitrate-reducing Fe(II) oxidation (NRFO) and its impacts on the process. The results showed that higher initial Cd concentration led to a higher amount of Cd immobilized in precipitates but inhibited nitrate reduction, acetate metabolism, and cell growth. Cd had a minimal effect on Fe(II) oxidation during NRFO but slowed down the mineral transformation. Cd was found to be strongly co-localized with Fe on the surface of bacterial cells. Cd immobilization experiments indicated that both bacterial cells and secondary minerals were important for Cd immobilization. The findings provide important insights into the behavior and interactions of Cd during the NRFO process.
Article
Engineering, Environmental
Dandan Chen, Kuan Cheng, Tongxu Liu, Guojun Chen, Andreas Kappler, Xiaomin Li, Raymond Jianxiong Zeng, Yang Yang, Fujun Yue, Shiwen Hu, Fang Cao, Fangbai Li
Summary: This study demonstrates that dual N-O isotopes and kinetic modeling can be used to distinguish biological and chemical processes during microbially mediated NRFO. The main nitrate reductase in Acidovorax sp. strain BoFeN1 was found to be membrane-bound dissimilatory nitrate reductase (Nar). N-O isotopes can be used to differentiate between chemical and biological reactions, and chemodenitrification plays a more important role than biological reactions during the coupled process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Songxiong Zhong, Liping Fang, Xiaomin Li, Tongxu Liu, Pei Wang, Ruichuan Gao, Guojun Chen, Haoming Yin, Yang Yang, Fang Huang, Fangbai Li
Summary: This study investigates the influence of chloride and sulfate ions on the transport of cadmium (Cd) in the soil-rice system. The results show that chloride and sulfate ions increase the concentration of Cd in the soil solution, Fe plaque, and rice plants, facilitating the mobility of Cd isotopes and contributing to Cd immobilization in the Fe plaque and uptake into roots. The findings provide insights into the role of anions in Cd migration and transformation in the soil-rice system.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Wenting Chi, Guojun Chen, Shiwen Hu, Xiaomin Li, Kuan Cheng, Qi Wang, Bingqing Xia, Yang Yang, Yibing Ma, Tongxu Liu
Summary: Paddy fields located around estuaries face the issue of seawater intrusion, and the impact of salinity levels on Cd accumulation in rice grains is still unclear. Pot experiments were conducted to investigate the effects of different salinity levels on Cd availability and uptake by rice plants. The results showed that higher salinity levels increased Cd availability and uptake in rice roots and grains, mainly due to competition for binding sites by cations and the formation of Cd complexation with anions. The study highlights the importance of considering food safety in rice cultivation near estuaries.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Zebin Hong, Shiwen Hu, Yang Yang, Ziwei Deng, Xiaomin Li, Tongxu Liu, Fangbai Li
Summary: Through investigating the variations of arsenic (As) in mine wastewater, it was found that under flooded condition, As(III) can be immobilized while As(V) can be activated in paddy soil, which influences the mobility of As. During drainage, available As is mainly immobilized by Fe oxyhydroxides and humic substances, and adsorbed As(III) is oxidized. These results provide an estimation pathway for the impacts of key biogeochemical cycles on exogenous As species under a redox-alternating condition.
Article
Environmental Sciences
Hansha Lu, Yang Yang, Kaiyi Huang, Guoyong Huang, Shiwen Hu, Dandan Pan, Tongxu Liu, Xiaomin Li
Summary: This study investigates the transformation of lead (Pb) in acidic soil under alternating anoxic-oxic conditions using a kinetic model. The results suggest that under anoxic conditions, Pb is gradually transferred to fulvic complex, Fe-Mn oxides bound, and sulfides bound Pb, while under oxic conditions, the fulvic complex Pb further increases. Phosphorus plays a more important role than organic matter in Pb immobilization under anoxic conditions, while the phosphates, Fe-Mn oxides, and sulfides immobilized Pb is slowly released and then complexed by fulvic acids during the re-immobilization of dissolved organic matter in soil under oxic conditions.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Guoyong Huang, Dandan Pan, Milan Wang, Songxiong Zhong, Yingmei Huang, Fangbai Li, Xiaomin Li, Baoshan Xing
Summary: This study elucidated the regulatory mechanisms of Fe and Cd uptake in rice roots by FeNPs, including the effects of Fe plaque, gene expression, and NP accumulation. The application of FeNPs restricted the translocation of Fe to shoots, resulting in even lower Fe accumulation in shoots compared to those without FeNPs.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Chemistry, Multidisciplinary
Dandan Pan, Guoyong Huang, Jicai Yi, Jianghu Cui, Chuanping Liu, Fangbai Li, Xiaomin Li
Summary: The foliar application of silica nanoparticles to rice plants can reduce arsenic concentration in grains and restrict arsenic transport to leaves, husks, and grains. While silicon application does not decrease arsenic accumulation in the whole plant, it alters the distribution of arsenic in the plant.
ENVIRONMENTAL SCIENCE-NANO
(2022)
